gobject/gsignal.c

   1 /* GObject - GLib Type, Object, Parameter and Signal Library
   2  * Copyright (C) 2000-2001 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General
  15  * Public License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  *
  19  * this code is based on the original GtkSignal implementation
  20  * for the Gtk+ library by Peter Mattis <petm@xcf.berkeley.edu>
  21  */
  22
  23 /*
  24  * MT safe
  25  */
  26
  27 #include        "gsignal.h"
  28 #include        "gbsearcharray.h"
  29 #include        "gvaluecollector.h"
  30 #include        "gvaluetypes.h"
  31 #include        "gboxed.h"
  32 #include        <string.h>
  33
  34
  35 /* pre allocation configurations
  36  */
  37 #define MAX_STACK_VALUES        (16)
  38 #define HANDLER_PRE_ALLOC       (48)
  39 #define EMISSION_PRE_ALLOC      (16)
  40
  41 #define REPORT_BUG      "please report occourance circumstances to gtk-devel-list@gnome.org"
  42 #ifdef  G_ENABLE_DEBUG
  43 #define IF_DEBUG(debug_type, cond)      if ((_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type) || cond)
  44 static volatile gpointer *g_trace_instance_signals = NULL;
  45 static volatile gpointer *g_trap_instance_signals = NULL;
  46 #endif  /* G_ENABLE_DEBUG */
  47
  48
  49 /* --- generic allocation --- */
  50 /* we special case allocations generically by replacing
  51  * these functions with more speed/memory aware variants
  52  */
  53 #ifndef DISABLE_MEM_POOLS
  54 static inline gpointer
  55 g_generic_node_alloc (GTrashStack **trash_stack_p,
  56                       guint         sizeof_node,
  57                       guint         nodes_pre_alloc)
  58 {
  59   gpointer node = g_trash_stack_pop (trash_stack_p);
  60
  61   if (!node)
  62     {
  63       guint8 *block;
  64
  65       nodes_pre_alloc = MAX (nodes_pre_alloc, 1);
  66       block = g_malloc (sizeof_node * nodes_pre_alloc);
  67       while (--nodes_pre_alloc)
  68         {
  69           g_trash_stack_push (trash_stack_p, block);
  70           block += sizeof_node;
  71         }
  72       node = block;
  73     }
  74
  75   return node;
  76 }
  77 #define g_generic_node_free(trash_stack_p, node) g_trash_stack_push (trash_stack_p, node)
  78 #else   /* !DISABLE_MEM_POOLS */
  79 #define g_generic_node_alloc(t,sizeof_node,p)    g_malloc (sizeof_node)
  80 #define g_generic_node_free(t,node)              g_free (node)
  81 #endif  /* !DISABLE_MEM_POOLS */
  82
  83
  84 /* --- typedefs --- */
  85 typedef struct _SignalNode   SignalNode;
  86 typedef struct _SignalKey    SignalKey;
  87 typedef struct _Emission     Emission;
  88 typedef struct _Handler      Handler;
  89 typedef struct _HandlerList  HandlerList;
  90 typedef struct _HandlerMatch HandlerMatch;
  91 typedef enum
  92 {
  93   EMISSION_STOP,
  94   EMISSION_RUN,
  95   EMISSION_HOOK,
  96   EMISSION_RESTART
  97 } EmissionState;
  98
  99
 100 /* --- prototypes --- */
 101 static inline guint             signal_id_lookup        (GQuark           quark,
 102                                                          GType            itype);
 103 static        void              signal_destroy_R        (SignalNode      *signal_node);
 104 static inline HandlerList*      handler_list_ensure     (guint            signal_id,
 105                                                          gpointer         instance);
 106 static inline HandlerList*      handler_list_lookup     (guint            signal_id,
 107                                                          gpointer         instance);
 108 static inline Handler*          handler_new             (gboolean         after);
 109 static        void              handler_insert          (guint            signal_id,
 110                                                          gpointer         instance,
 111                                                          Handler         *handler);
 112 static        Handler*          handler_lookup          (gpointer         instance,
 113                                                          guint            handler_id,
 114                                                          guint           *signal_id_p);
 115 static inline HandlerMatch*     handler_match_prepend   (HandlerMatch    *list,
 116                                                          Handler         *handler,
 117                                                          guint            signal_id);
 118 static inline HandlerMatch*     handler_match_free1_R   (HandlerMatch    *node,
 119                                                          gpointer         instance);
 120 static        HandlerMatch*     handlers_find           (gpointer         instance,
 121                                                          GSignalMatchType mask,
 122                                                          guint            signal_id,
 123                                                          GQuark           detail,
 124                                                          GClosure        *closure,
 125                                                          gpointer         func,
 126                                                          gpointer         data,
 127                                                          gboolean         one_and_only);
 128 static inline void              handler_ref             (Handler         *handler);
 129 static inline void              handler_unref_R         (guint            signal_id,
 130                                                          gpointer         instance,
 131                                                          Handler         *handler);
 132 static inline void              emission_push           (Emission       **emission_list_p,
 133                                                          guint            signal_id,
 134                                                          GQuark           detail,
 135                                                          gpointer         instance,
 136                                                          EmissionState   *state_p);
 137 static inline void              emission_pop            (Emission       **emission_list_p,
 138                                                          EmissionState   *state_p);
 139 static inline Emission*         emission_find           (Emission        *emission_list,
 140                                                          guint            signal_id,
 141                                                          GQuark           detail,
 142                                                          gpointer         instance);
 143 static gint                     signal_key_cmp          (gconstpointer    node1,
 144                                                          gconstpointer    node2);
 145 static        gboolean          signal_emit_R           (SignalNode      *node,
 146                                                          GQuark           detail,
 147                                                          gpointer         instance,
 148                                                          GValue          *return_value,
 149                                                          const GValue    *instance_and_params);
 150
 151
 152 /* --- structures --- */
 153 typedef struct
 154 {
 155   GSignalAccumulator func;
 156   gpointer           data;
 157 } SignalAccumulator;
 158 typedef struct
 159 {
 160   GHook hook;
 161   GQuark detail;
 162 } SignalHook;
 163 #define SIGNAL_HOOK(hook)       ((SignalHook*) (hook))
 164
 165 struct _SignalNode
 166 {
 167   /* permanent portion */
 168   guint              signal_id;
 169   GType              itype;
 170   gchar             *name;
 171   guint              destroyed : 1;
 172
 173   /* reinitializable portion */
 174   guint              flags : 8;
 175   guint              n_params : 8;
 176   GType             *param_types; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
 177   GType              return_type; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
 178   GClosure          *class_closure;
 179   SignalAccumulator *accumulator;
 180   GSignalCMarshaller c_marshaller;
 181   GHookList         *emission_hooks;
 182 };
 183
 184 struct _SignalKey
 185 {
 186   GType  itype;
 187   GQuark quark;
 188   guint  signal_id;
 189 };
 190
 191 struct _Emission
 192 {
 193   Emission      *next;
 194   guint          signal_id;
 195   GQuark         detail;
 196   gpointer       instance;
 197   EmissionState *state_p;
 198 };
 199
 200 struct _HandlerList
 201 {
 202   guint    signal_id;
 203   Handler *handlers;
 204 };
 205 struct _Handler
 206 {
 207   guint         id;
 208   Handler      *next;
 209   Handler      *prev;
 210   GQuark        detail;
 211   guint         ref_count : 16;
 212 #define HANDLER_MAX_REF_COUNT   (1 << 16)
 213   guint         block_count : 12;
 214 #define HANDLER_MAX_BLOCK_COUNT (1 << 12)
 215   guint         after : 1;
 216   GClosure     *closure;
 217 };
 218 struct _HandlerMatch
 219 {
 220   Handler      *handler;
 221   HandlerMatch *next;
 222   union {
 223     guint       signal_id;
 224     gpointer    dummy;
 225   } d;
 226 };
 227
 228
 229 /* --- variables --- */
 230 static GBSearchArray  g_signal_key_bsa = G_STATIC_BSEARCH_ARRAY_INIT (sizeof (SignalKey),
 231                                                                       signal_key_cmp,
 232                                                                       G_BSEARCH_ARRAY_ALIGN_POWER2);
 233 static GHashTable    *g_handler_list_bsa_ht = NULL;
 234 static Emission      *g_recursive_emissions = NULL;
 235 static Emission      *g_restart_emissions = NULL;
 236 static GTrashStack   *g_handler_ts = NULL;
 237 static GTrashStack   *g_emission_ts = NULL;
 238 G_LOCK_DEFINE_STATIC (g_signal_mutex);
 239
 240
 241 /* --- signal nodes --- */
 242 static guint          g_n_signal_nodes = 0;
 243 static SignalNode   **g_signal_nodes = NULL;
 244
 245 static inline SignalNode*
 246 LOOKUP_SIGNAL_NODE (register guint signal_id)
 247 {
 248   if (signal_id < g_n_signal_nodes)
 249     return g_signal_nodes[signal_id];
 250   else
 251     return NULL;
 252 }
 253
 254
 255 /* --- functions --- */
 256 static inline guint
 257 signal_id_lookup (GQuark quark,
 258                   GType  itype)
 259 {
 260   GType *ifaces, type = itype;
 261   SignalKey key;
 262   guint n_ifaces;
 263
 264   key.quark = quark;
 265
 266   /* try looking up signals for this type and its anchestors */
 267   do
 268     {
 269       SignalKey *signal_key;
 270
 271       key.itype = type;
 272       signal_key = g_bsearch_array_lookup (&g_signal_key_bsa, &key);
 273
 274       if (signal_key)
 275         return signal_key->signal_id;
 276
 277       type = g_type_parent (type);
 278     }
 279   while (type);
 280
 281   /* no luck, try interfaces it exports */
 282   ifaces = g_type_interfaces (itype, &n_ifaces);
 283   while (n_ifaces--)
 284     {
 285       SignalKey *signal_key;
 286
 287       key.itype = ifaces[n_ifaces];
 288       signal_key = g_bsearch_array_lookup (&g_signal_key_bsa, &key);
 289
 290       if (signal_key)
 291         {
 292           g_free (ifaces);
 293           return signal_key->signal_id;
 294         }
 295     }
 296   g_free (ifaces);
 297
 298   return 0;
 299 }
 300
 301 static gint
 302 handler_lists_cmp (gconstpointer node1,
 303                    gconstpointer node2)
 304 {
 305   const HandlerList *hlist1 = node1, *hlist2 = node2;
 306
 307   return G_BSEARCH_ARRAY_CMP (hlist1->signal_id, hlist2->signal_id);
 308 }
 309
 310 static inline HandlerList*
 311 handler_list_ensure (guint    signal_id,
 312                      gpointer instance)
 313 {
 314   GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
 315   HandlerList key;
 316
 317   if (!hlbsa)
 318     {
 319       hlbsa = g_bsearch_array_new (sizeof (HandlerList), handler_lists_cmp, G_BSEARCH_ARRAY_DEFER_SHRINK);
 320       g_hash_table_insert (g_handler_list_bsa_ht, instance, hlbsa);
 321     }
 322   key.signal_id = signal_id;
 323   key.handlers = NULL;
 324
 325   return g_bsearch_array_insert (hlbsa, &key, FALSE);
 326 }
 327
 328 static inline HandlerList*
 329 handler_list_lookup (guint    signal_id,
 330                      gpointer instance)
 331 {
 332   GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
 333   HandlerList key;
 334
 335   key.signal_id = signal_id;
 336
 337   return hlbsa ? g_bsearch_array_lookup (hlbsa, &key) : NULL;
 338 }
 339
 340 static Handler*
 341 handler_lookup (gpointer instance,
 342                 guint    handler_id,
 343                 guint   *signal_id_p)
 344 {
 345   GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
 346
 347   if (hlbsa)
 348     {
 349       guint i;
 350
 351       for (i = 0; i < hlbsa->n_nodes; i++)
 352         {
 353           HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, i);
 354           Handler *handler;
 355
 356           for (handler = hlist->handlers; handler; handler = handler->next)
 357             if (handler->id == handler_id)
 358               {
 359                 if (signal_id_p)
 360                   *signal_id_p = hlist->signal_id;
 361
 362                 return handler;
 363               }
 364         }
 365     }
 366
 367   return NULL;
 368 }
 369
 370 static inline HandlerMatch*
 371 handler_match_prepend (HandlerMatch *list,
 372                        Handler      *handler,
 373                        guint         signal_id)
 374 {
 375   HandlerMatch *node;
 376
 377   /* yeah, we could use our own memchunk here, introducing yet more
 378    * rarely used cached nodes and extra allocation overhead.
 379    * instead, we use GList* nodes, since they are exactly the size
 380    * we need and are already cached. g_signal_init() asserts this.
 381    */
 382   node = (HandlerMatch*) g_list_alloc ();
 383   node->handler = handler;
 384   node->next = list;
 385   node->d.signal_id = signal_id;
 386   handler_ref (handler);
 387
 388   return node;
 389 }
 390 static inline HandlerMatch*
 391 handler_match_free1_R (HandlerMatch *node,
 392                        gpointer      instance)
 393 {
 394   HandlerMatch *next = node->next;
 395
 396   handler_unref_R (node->d.signal_id, instance, node->handler);
 397   g_list_free_1 ((GList*) node);
 398
 399   return next;
 400 }
 401
 402 static HandlerMatch*
 403 handlers_find (gpointer         instance,
 404                GSignalMatchType mask,
 405                guint            signal_id,
 406                GQuark           detail,
 407                GClosure        *closure,
 408                gpointer         func,
 409                gpointer         data,
 410                gboolean         one_and_only)
 411 {
 412   HandlerMatch *mlist = NULL;
 413
 414   if (mask & G_SIGNAL_MATCH_ID)
 415     {
 416       HandlerList *hlist = handler_list_lookup (signal_id, instance);
 417       Handler *handler;
 418       SignalNode *node = NULL;
 419
 420       if (mask & G_SIGNAL_MATCH_FUNC)
 421         {
 422           node = LOOKUP_SIGNAL_NODE (signal_id);
 423           if (!node || !node->c_marshaller)
 424             return NULL;
 425         }
 426
 427       mask = ~mask;
 428       for (handler = hlist ? hlist->handlers : NULL; handler; handler = handler->next)
 429         if (handler->id &&
 430             ((mask & G_SIGNAL_MATCH_DETAIL) || handler->detail == detail) &&
 431             ((mask & G_SIGNAL_MATCH_CLOSURE) || handler->closure == closure) &&
 432             ((mask & G_SIGNAL_MATCH_DATA) || handler->closure->data == data) &&
 433             ((mask & G_SIGNAL_MATCH_UNBLOCKED) || handler->block_count == 0) &&
 434             ((mask & G_SIGNAL_MATCH_FUNC) || (handler->closure->marshal == node->c_marshaller &&
 435                                               handler->closure->meta_marshal == 0 &&
 436                                               ((GCClosure*) handler->closure)->callback == func)))
 437           {
 438             mlist = handler_match_prepend (mlist, handler, signal_id);
 439             if (one_and_only)
 440               return mlist;
 441           }
 442     }
 443   else
 444     {
 445       GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
 446
 447       mask = ~mask;
 448       if (hlbsa)
 449         {
 450           guint i;
 451
 452           for (i = 0; i < hlbsa->n_nodes; i++)
 453             {
 454               HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, i);
 455               SignalNode *node = NULL;
 456               Handler *handler;
 457
 458               if (!(mask & G_SIGNAL_MATCH_FUNC))
 459                 {
 460                   node = LOOKUP_SIGNAL_NODE (hlist->signal_id);
 461                   if (!node->c_marshaller)
 462                     continue;
 463                 }
 464
 465               for (handler = hlist->handlers; handler; handler = handler->next)
 466                 if (handler->id &&
 467                     ((mask & G_SIGNAL_MATCH_DETAIL) || handler->detail == detail) &&
 468                     ((mask & G_SIGNAL_MATCH_CLOSURE) || handler->closure == closure) &&
 469                     ((mask & G_SIGNAL_MATCH_DATA) || handler->closure->data == data) &&
 470                     ((mask & G_SIGNAL_MATCH_UNBLOCKED) || handler->block_count == 0) &&
 471                     ((mask & G_SIGNAL_MATCH_FUNC) || (handler->closure->marshal == node->c_marshaller &&
 472                                                       handler->closure->meta_marshal == 0 &&
 473                                                       ((GCClosure*) handler->closure)->callback == func)))
 474                   {
 475                     mlist = handler_match_prepend (mlist, handler, hlist->signal_id);
 476                     if (one_and_only)
 477                       return mlist;
 478                   }
 479             }
 480         }
 481     }
 482
 483   return mlist;
 484 }
 485
 486 static inline Handler*
 487 handler_new (gboolean after)
 488 {
 489   static guint handler_id = 1;
 490   Handler *handler = g_generic_node_alloc (&g_handler_ts,
 491                                            sizeof (Handler),
 492                                            HANDLER_PRE_ALLOC);
 493 #ifndef G_DISABLE_CHECKS
 494   if (handler_id == 0)
 495     g_error (G_STRLOC ": handler id overflow, %s", REPORT_BUG);
 496 #endif
 497
 498   handler->id = handler_id++;
 499   handler->prev = NULL;
 500   handler->next = NULL;
 501   handler->detail = 0;
 502   handler->ref_count = 1;
 503   handler->block_count = 0;
 504   handler->after = after != FALSE;
 505   handler->closure = NULL;
 506
 507   return handler;
 508 }
 509
 510 static inline void
 511 handler_ref (Handler *handler)
 512 {
 513   g_return_if_fail (handler->ref_count > 0);
 514
 515 #ifndef G_DISABLE_CHECKS
 516   if (handler->ref_count >= HANDLER_MAX_REF_COUNT - 1)
 517     g_error (G_STRLOC ": handler ref_count overflow, %s", REPORT_BUG);
 518 #endif
 519
 520   handler->ref_count += 1;
 521 }
 522
 523 static inline void
 524 handler_unref_R (guint    signal_id,
 525                  gpointer instance,
 526                  Handler *handler)
 527 {
 528   g_return_if_fail (handler->ref_count > 0);
 529
 530   handler->ref_count -= 1;
 531   if (!handler->ref_count)
 532     {
 533       if (handler->next)
 534         handler->next->prev = handler->prev;
 535       if (handler->prev)        /* watch out for g_signal_handlers_destroy()! */
 536         handler->prev->next = handler->next;
 537       else
 538         {
 539           HandlerList *hlist = handler_list_lookup (signal_id, instance);
 540
 541           hlist->handlers = handler->next;
 542         }
 543       G_UNLOCK (g_signal_mutex);
 544       g_closure_unref (handler->closure);
 545       G_LOCK (g_signal_mutex);
 546       g_generic_node_free (&g_handler_ts, handler);
 547     }
 548 }
 549
 550 static void
 551 handler_insert (guint    signal_id,
 552                 gpointer instance,
 553                 Handler  *handler)
 554 {
 555   HandlerList *hlist;
 556
 557   g_assert (handler->prev == NULL && handler->next == NULL); /* paranoid */
 558
 559   hlist = handler_list_ensure (signal_id, instance);
 560   if (!hlist->handlers)
 561     hlist->handlers = handler;
 562   else if (hlist->handlers->after && !handler->after)
 563     {
 564       handler->next = hlist->handlers;
 565       hlist->handlers->prev = handler;
 566       hlist->handlers = handler;
 567     }
 568   else
 569     {
 570       Handler *tmp = hlist->handlers;
 571
 572       if (handler->after)
 573         while (tmp->next)
 574           tmp = tmp->next;
 575       else
 576         while (tmp->next && !tmp->next->after)
 577           tmp = tmp->next;
 578       if (tmp->next)
 579         tmp->next->prev = handler;
 580       handler->next = tmp->next;
 581       handler->prev = tmp;
 582       tmp->next = handler;
 583     }
 584 }
 585
 586 static inline void
 587 emission_push (Emission     **emission_list_p,
 588                guint          signal_id,
 589                GQuark         detail,
 590                gpointer       instance,
 591                EmissionState *state_p)
 592 {
 593   Emission *emission = g_generic_node_alloc (&g_emission_ts,
 594                                              sizeof (Emission),
 595                                              EMISSION_PRE_ALLOC);
 596   emission->next = *emission_list_p;
 597   emission->signal_id = signal_id;
 598   emission->detail = detail;
 599   emission->instance = instance;
 600   emission->state_p = state_p;
 601   *emission_list_p = emission;
 602 }
 603
 604 static inline void
 605 emission_pop (Emission     **emission_list_p,
 606               EmissionState *state_p)
 607 {
 608   Emission **loc = emission_list_p, *emission = *loc;
 609
 610   while (emission->state_p != state_p)
 611     {
 612       loc = &emission->next;
 613       emission = *loc;
 614     }
 615   *loc = emission->next;
 616   g_generic_node_free (&g_emission_ts, emission);
 617 }
 618
 619 static inline Emission*
 620 emission_find (Emission *emission_list,
 621                guint     signal_id,
 622                GQuark    detail,
 623                gpointer  instance)
 624 {
 625   Emission *emission;
 626
 627   for (emission = emission_list; emission; emission = emission->next)
 628     if (emission->instance == instance &&
 629         emission->signal_id == signal_id &&
 630         emission->detail == detail)
 631       return emission;
 632   return NULL;
 633 }
 634
 635 static gint
 636 signal_key_cmp (gconstpointer node1,
 637                 gconstpointer node2)
 638 {
 639   const SignalKey *key1 = node1, *key2 = node2;
 640
 641   if (key1->itype == key2->itype)
 642     return G_BSEARCH_ARRAY_CMP (key1->quark, key2->quark);
 643   else
 644     return G_BSEARCH_ARRAY_CMP (key1->itype, key2->itype);
 645 }
 646
 647 void
 648 g_signal_init (void) /* sync with gtype.c */
 649 {
 650   G_LOCK (g_signal_mutex);
 651   if (!g_n_signal_nodes)
 652     {
 653       /* handler_id_node_prepend() requires this */
 654       g_assert (sizeof (GList) == sizeof (HandlerMatch));
 655
 656       /* setup handler list binary searchable array hash table (in german, that'd be one word ;) */
 657       g_handler_list_bsa_ht = g_hash_table_new (g_direct_hash, NULL);
 658
 659       /* invalid (0) signal_id */
 660       g_n_signal_nodes = 1;
 661       g_signal_nodes = g_renew (SignalNode*, g_signal_nodes, g_n_signal_nodes);
 662       g_signal_nodes[0] = NULL;
 663     }
 664   G_UNLOCK (g_signal_mutex);
 665 }
 666
 667 void
 668 _g_signals_destroy (GType itype)
 669 {
 670   guint i;
 671
 672   G_LOCK (g_signal_mutex);
 673   for (i = 1; i < g_n_signal_nodes; i++)
 674     {
 675       SignalNode *node = g_signal_nodes[i];
 676
 677       if (node->itype == itype)
 678         {
 679           if (node->destroyed)
 680             g_warning (G_STRLOC ": signal \"%s\" of type `%s' already destroyed",
 681                        node->name,
 682                        g_type_name (node->itype));
 683           else
 684             signal_destroy_R (node);
 685         }
 686     }
 687   G_UNLOCK (g_signal_mutex);
 688 }
 689
 690 void
 691 g_signal_stop_emission (gpointer instance,
 692                         guint    signal_id,
 693                         GQuark   detail)
 694 {
 695   SignalNode *node;
 696
 697   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
 698   g_return_if_fail (signal_id > 0);
 699
 700   G_LOCK (g_signal_mutex);
 701   node = LOOKUP_SIGNAL_NODE (signal_id);
 702   if (node && detail && !(node->flags & G_SIGNAL_DETAILED))
 703     {
 704       g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
 705       G_UNLOCK (g_signal_mutex);
 706       return;
 707     }
 708   if (node && g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
 709     {
 710       Emission *emission_list = node->flags & G_SIGNAL_NO_RECURSE ? g_restart_emissions : g_recursive_emissions;
 711       Emission *emission = emission_find (emission_list, signal_id, detail, instance);
 712
 713       if (emission)
 714         {
 715           if (*emission->state_p == EMISSION_HOOK)
 716             g_warning (G_STRLOC ": emission of signal \"%s\" for instance `%p' cannot be stopped from emission hook",
 717                        node->name, instance);
 718           else if (*emission->state_p == EMISSION_RUN)
 719             *emission->state_p = EMISSION_STOP;
 720         }
 721       else
 722         g_warning (G_STRLOC ": no emission of signal \"%s\" to stop for instance `%p'",
 723                    node->name, instance);
 724     }
 725   else
 726     g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
 727   G_UNLOCK (g_signal_mutex);
 728 }
 729
 730 static void
 731 signal_finalize_hook (GHookList *hook_list,
 732                       GHook     *hook)
 733 {
 734   GDestroyNotify destroy = hook->destroy;
 735
 736   if (destroy)
 737     {
 738       hook->destroy = NULL;
 739       G_UNLOCK (g_signal_mutex);
 740       destroy (hook->data);
 741       G_LOCK (g_signal_mutex);
 742     }
 743 }
 744
 745 guint
 746 g_signal_add_emission_hook (guint               signal_id,
 747                             GQuark              detail,
 748                             GSignalEmissionHook hook_func,
 749                             gpointer            hook_data,
 750                             GDestroyNotify      data_destroy)
 751 {
 752   static guint seq_hook_id = 1;
 753   SignalNode *node;
 754   GHook *hook;
 755   SignalHook *signal_hook;
 756
 757   g_return_val_if_fail (signal_id > 0, 0);
 758   g_return_val_if_fail (hook_func != NULL, 0);
 759
 760   G_LOCK (g_signal_mutex);
 761   node = LOOKUP_SIGNAL_NODE (signal_id);
 762   if (!node || node->destroyed || (node->flags & G_SIGNAL_NO_HOOKS))
 763     {
 764       g_warning ("%s: invalid signal id `%u'", G_STRLOC, signal_id);
 765       G_UNLOCK (g_signal_mutex);
 766       return 0;
 767     }
 768   if (detail && !(node->flags & G_SIGNAL_DETAILED))
 769     {
 770       g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
 771       G_UNLOCK (g_signal_mutex);
 772       return 0;
 773     }
 774   if (!node->emission_hooks)
 775     {
 776       node->emission_hooks = g_new (GHookList, 1);
 777       g_hook_list_init (node->emission_hooks, sizeof (SignalHook));
 778       node->emission_hooks->finalize_hook = signal_finalize_hook;
 779     }
 780   hook = g_hook_alloc (node->emission_hooks);
 781   hook->data = hook_data;
 782   hook->func = hook_func;
 783   hook->destroy = data_destroy;
 784   signal_hook = SIGNAL_HOOK (hook);
 785   signal_hook->detail = detail;
 786   node->emission_hooks->seq_id = seq_hook_id;
 787   g_hook_append (node->emission_hooks, hook);
 788   seq_hook_id = node->emission_hooks->seq_id;
 789   G_UNLOCK (g_signal_mutex);
 790
 791   return hook->hook_id;
 792 }
 793
 794 void
 795 g_signal_remove_emission_hook (guint signal_id,
 796                                guint hook_id)
 797 {
 798   SignalNode *node;
 799
 800   g_return_if_fail (signal_id > 0);
 801   g_return_if_fail (hook_id > 0);
 802
 803   G_LOCK (g_signal_mutex);
 804   node = LOOKUP_SIGNAL_NODE (signal_id);
 805   if (!node || node->destroyed)
 806     g_warning ("%s: invalid signal id `%u'", G_STRLOC, signal_id);
 807   else if (!node->emission_hooks || !g_hook_destroy (node->emission_hooks, hook_id))
 808     g_warning ("%s: signal \"%s\" had no hook (%u) to remove", G_STRLOC, node->name, hook_id);
 809   G_UNLOCK (g_signal_mutex);
 810 }
 811
 812 static inline guint
 813 signal_parse_name (const gchar *name,
 814                    GType        itype,
 815                    GQuark      *detail_p,
 816                    gboolean     force_quark)
 817 {
 818   const gchar *colon = strchr (name, ':');
 819   guint signal_id;
 820
 821   if (!colon)
 822     {
 823       signal_id = signal_id_lookup (g_quark_try_string (name), itype);
 824       if (signal_id && detail_p)
 825         *detail_p = 0;
 826     }
 827   else if (colon[1] == ':')
 828     {
 829       gchar buffer[32];
 830       guint l = colon - name;
 831
 832       if (l < 32)
 833         {
 834           memcpy (buffer, name, l);
 835           buffer[l] = 0;
 836           signal_id = signal_id_lookup (g_quark_try_string (buffer), itype);
 837         }
 838       else
 839         {
 840           gchar *signal = g_new (gchar, l + 1);
 841
 842           memcpy (signal, name, l);
 843           signal[l] = 0;
 844           signal_id = signal_id_lookup (g_quark_try_string (signal), itype);
 845           g_free (signal);
 846         }
 847
 848       if (signal_id && detail_p)
 849         *detail_p = colon[2] ? (force_quark ? g_quark_from_string : g_quark_try_string) (colon + 2) : 0;
 850     }
 851   else
 852     signal_id = 0;
 853   return signal_id;
 854 }
 855
 856 gboolean
 857 g_signal_parse_name (const gchar *detailed_signal,
 858                      GType        itype,
 859                      guint       *signal_id_p,
 860                      GQuark      *detail_p,
 861                      gboolean     force_detail_quark)
 862 {
 863   SignalNode *node;
 864   GQuark detail = 0;
 865   guint signal_id;
 866
 867   g_return_val_if_fail (detailed_signal != NULL, FALSE);
 868   g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), FALSE);
 869
 870   G_LOCK (g_signal_mutex);
 871   signal_id = signal_parse_name (detailed_signal, itype, &detail, force_detail_quark);
 872   G_UNLOCK (g_signal_mutex);
 873
 874   node = signal_id ? LOOKUP_SIGNAL_NODE (signal_id) : NULL;
 875   if (!node || node->destroyed ||
 876       (detail && !(node->flags & G_SIGNAL_DETAILED)))
 877     return FALSE;
 878
 879   if (signal_id_p)
 880     *signal_id_p = signal_id;
 881   if (detail_p)
 882     *detail_p = detail;
 883
 884   return TRUE;
 885 }
 886
 887 guint
 888 g_signal_lookup (const gchar *name,
 889                  GType        itype)
 890 {
 891   guint signal_id;
 892
 893   g_return_val_if_fail (name != NULL, 0);
 894   g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
 895
 896   G_LOCK (g_signal_mutex);
 897   signal_id = signal_id_lookup (g_quark_try_string (name), itype);
 898   G_UNLOCK (g_signal_mutex);
 899
 900   return signal_id;
 901 }
 902
 903 G_CONST_RETURN gchar*
 904 g_signal_name (guint signal_id)
 905 {
 906   SignalNode *node;
 907   gchar *name;
 908
 909   G_LOCK (g_signal_mutex);
 910   node = LOOKUP_SIGNAL_NODE (signal_id);
 911   name = node ? node->name : NULL;
 912   G_UNLOCK (g_signal_mutex);
 913
 914   return name;
 915 }
 916
 917 void
 918 g_signal_query (guint         signal_id,
 919                 GSignalQuery *query)
 920 {
 921   SignalNode *node;
 922
 923   g_return_if_fail (query != NULL);
 924
 925   G_LOCK (g_signal_mutex);
 926   node = LOOKUP_SIGNAL_NODE (signal_id);
 927   if (!node || node->destroyed)
 928     query->signal_id = 0;
 929   else
 930     {
 931       query->signal_id = node->signal_id;
 932       query->signal_name = node->name;
 933       query->itype = node->itype;
 934       query->signal_flags = node->flags;
 935       query->return_type = node->return_type;
 936       query->n_params = node->n_params;
 937       query->param_types = node->param_types;
 938     }
 939   G_UNLOCK (g_signal_mutex);
 940 }
 941
 942 guint*
 943 g_signal_list_ids (GType  itype,
 944                    guint *n_ids)
 945 {
 946   SignalKey *keys;
 947   GArray *result;
 948   guint n_nodes;
 949   guint i;
 950
 951   g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), NULL);
 952   g_return_val_if_fail (n_ids != NULL, NULL);
 953
 954   G_LOCK (g_signal_mutex);
 955
 956   keys = g_signal_key_bsa.nodes;
 957   n_nodes  = g_signal_key_bsa.n_nodes;
 958   result = g_array_new (FALSE, FALSE, sizeof (guint));
 959
 960   for (i = 0; i < n_nodes; i++)
 961     if (keys[i].itype == itype)
 962       {
 963         const gchar *name = g_quark_to_string (keys[i].quark);
 964
 965         /* Signal names with "_" in them are aliases to the same
 966          * name with "-" instead of "_".
 967          */
 968         if (!strchr (name, '_'))
 969           g_array_append_val (result, keys[i].signal_id);
 970       }
 971
 972   *n_ids = result->len;
 973
 974   G_UNLOCK (g_signal_mutex);
 975
 976   return (guint*) g_array_free (result, FALSE);
 977 }
 978
 979 guint
 980 g_signal_new_valist (const gchar       *signal_name,
 981                      GType              itype,
 982                      GSignalFlags       signal_flags,
 983                      GClosure          *class_closure,
 984                      GSignalAccumulator accumulator,
 985                      gpointer           accu_data,
 986                      GSignalCMarshaller c_marshaller,
 987                      GType              return_type,
 988                      guint              n_params,
 989                      va_list            args)
 990 {
 991   GType *param_types;
 992   guint i;
 993   guint signal_id;
 994
 995   if (n_params > 0)
 996     {
 997       param_types = g_new (GType, n_params);
 998
 999       for (i = 0; i < n_params; i++)
1000         param_types[i] = va_arg (args, GType);
1001     }
1002   else
1003     param_types = NULL;
1004
1005   signal_id = g_signal_newv (signal_name, itype, signal_flags,
1006                              class_closure, accumulator, accu_data, c_marshaller,
1007                              return_type, n_params, param_types);
1008   g_free (param_types);
1009
1010   return signal_id;
1011 }
1012
1013 guint
1014 g_signal_newc (const gchar       *signal_name,
1015                GType              itype,
1016                GSignalFlags       signal_flags,
1017                guint              class_offset,
1018                GSignalAccumulator accumulator,
1019                gpointer           accu_data,
1020                GSignalCMarshaller c_marshaller,
1021                GType              return_type,
1022                guint              n_params,
1023                ...)
1024 {
1025   va_list args;
1026   guint signal_id;
1027
1028   g_return_val_if_fail (signal_name != NULL, 0);
1029
1030   va_start (args, n_params);
1031
1032   signal_id = g_signal_new_valist (signal_name, itype, signal_flags,
1033                                    class_offset ? g_signal_type_cclosure_new (itype, class_offset) : NULL,
1034                                    accumulator, accu_data, c_marshaller,
1035                                    return_type, n_params, args);
1036
1037   va_end (args);
1038
1039   return signal_id;
1040 }
1041
1042 guint
1043 g_signal_newv (const gchar       *signal_name,
1044                GType              itype,
1045                GSignalFlags       signal_flags,
1046                GClosure          *class_closure,
1047                GSignalAccumulator accumulator,
1048                gpointer           accu_data,
1049                GSignalCMarshaller c_marshaller,
1050                GType              return_type,
1051                guint              n_params,
1052                GType             *param_types)
1053 {
1054   gchar *name;
1055   guint signal_id, i;
1056   SignalNode *node;
1057
1058   g_return_val_if_fail (signal_name != NULL, 0);
1059   g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
1060   if (n_params)
1061     g_return_val_if_fail (param_types != NULL, 0);
1062   g_return_val_if_fail ((return_type & G_SIGNAL_TYPE_STATIC_SCOPE) == 0, 0);
1063   if (return_type == (G_TYPE_NONE & ~G_SIGNAL_TYPE_STATIC_SCOPE))
1064     g_return_val_if_fail (accumulator == NULL, 0);
1065   if (!accumulator)
1066     g_return_val_if_fail (accu_data == NULL, 0);
1067
1068   name = g_strdup (signal_name);
1069   g_strdelimit (name, G_STR_DELIMITERS ":^", '_');  // FIXME do character checks like for types
1070
1071   G_LOCK (g_signal_mutex);
1072
1073   signal_id = signal_id_lookup (g_quark_try_string (name), itype);
1074   node = LOOKUP_SIGNAL_NODE (signal_id);
1075   if (node && !node->destroyed)
1076     {
1077       g_warning (G_STRLOC ": signal \"%s\" already exists in the `%s' %s",
1078                  name,
1079                  g_type_name (node->itype),
1080                  G_TYPE_IS_INTERFACE (node->itype) ? "interface" : "class ancestry");
1081       g_free (name);
1082       G_UNLOCK (g_signal_mutex);
1083       return 0;
1084     }
1085   if (node && node->itype != itype)
1086     {
1087       g_warning (G_STRLOC ": signal \"%s\" for type `%s' was previously created for type `%s'",
1088                  name,
1089                  g_type_name (itype),
1090                  g_type_name (node->itype));
1091       g_free (name);
1092       G_UNLOCK (g_signal_mutex);
1093       return 0;
1094     }
1095   for (i = 0; i < n_params; i++)
1096     if (!G_TYPE_IS_VALUE (param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE))
1097       {
1098         g_warning (G_STRLOC ": parameter %d of type `%s' for signal \"%s::%s\" is not a value type",
1099                    i + 1, g_type_name (param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE), g_type_name (itype), name);
1100         g_free (name);
1101         G_UNLOCK (g_signal_mutex);
1102         return 0;
1103       }
1104   if (return_type != G_TYPE_NONE && !G_TYPE_IS_VALUE (return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE))
1105     {
1106       g_warning (G_STRLOC ": return value of type `%s' for signal \"%s::%s\" is not a value type",
1107                  g_type_name (return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE), g_type_name (itype), name);
1108       g_free (name);
1109       G_UNLOCK (g_signal_mutex);
1110       return 0;
1111     }
1112
1113   /* setup permanent portion of signal node */
1114   if (!node)
1115     {
1116       SignalKey key;
1117
1118       signal_id = g_n_signal_nodes++;
1119       node = g_new (SignalNode, 1);
1120       node->signal_id = signal_id;
1121       g_signal_nodes = g_renew (SignalNode*, g_signal_nodes, g_n_signal_nodes);
1122       g_signal_nodes[signal_id] = node;
1123       node->itype = itype;
1124       node->name = name;
1125       key.itype = itype;
1126       key.quark = g_quark_from_string (node->name);
1127       key.signal_id = signal_id;
1128       g_bsearch_array_insert (&g_signal_key_bsa, &key, FALSE);
1129       g_strdelimit (node->name, "_", '-');
1130       key.quark = g_quark_from_static_string (node->name);
1131       g_bsearch_array_insert (&g_signal_key_bsa, &key, FALSE);
1132     }
1133   node->destroyed = FALSE;
1134
1135   /* setup reinitializable portion */
1136   node->flags = signal_flags & G_SIGNAL_FLAGS_MASK;
1137   node->n_params = n_params;
1138   node->param_types = g_memdup (param_types, sizeof (GType) * n_params);
1139   node->return_type = return_type;
1140   node->class_closure = class_closure ? g_closure_ref (class_closure) : NULL;
1141   if (class_closure)
1142     g_closure_sink (class_closure);
1143   if (accumulator)
1144     {
1145       node->accumulator = g_new (SignalAccumulator, 1);
1146       node->accumulator->func = accumulator;
1147       node->accumulator->data = accu_data;
1148     }
1149   else
1150     node->accumulator = NULL;
1151   node->c_marshaller = c_marshaller;
1152   node->emission_hooks = NULL;
1153   if (node->c_marshaller && class_closure && G_CLOSURE_NEEDS_MARSHAL (class_closure))
1154     g_closure_set_marshal (class_closure, node->c_marshaller);
1155   G_UNLOCK (g_signal_mutex);
1156   return signal_id;
1157 }
1158
1159 static void
1160 signal_destroy_R (SignalNode *signal_node)
1161 {
1162   SignalNode node = *signal_node;
1163
1164   signal_node->destroyed = TRUE;
1165
1166   /* reentrancy caution, zero out real contents first */
1167   signal_node->n_params = 0;
1168   signal_node->param_types = NULL;
1169   signal_node->return_type = 0;
1170   signal_node->class_closure = NULL;
1171   signal_node->accumulator = NULL;
1172   signal_node->c_marshaller = NULL;
1173   signal_node->emission_hooks = NULL;
1174
1175 #ifdef  G_ENABLE_DEBUG
1176   /* check current emissions */
1177   {
1178     Emission *emission;
1179
1180     for (emission = (node.flags & G_SIGNAL_NO_RECURSE) ? g_restart_emissions : g_recursive_emissions;
1181          emission; emission = emission->next)
1182       if (emission->signal_id == node.signal_id)
1183         g_critical (G_STRLOC ": signal \"%s\" being destroyed is currently in emission (instance `%p')",
1184                     node.name, emission->instance);
1185   }
1186 #endif
1187
1188   /* free contents that need to
1189    */
1190   G_UNLOCK (g_signal_mutex);
1191   g_free (node.param_types);
1192   g_closure_unref (node.class_closure);
1193   g_free (node.accumulator);
1194   if (node.emission_hooks)
1195     {
1196       g_hook_list_clear (node.emission_hooks);
1197       g_free (node.emission_hooks);
1198     }
1199   G_LOCK (g_signal_mutex);
1200 }
1201
1202 guint
1203 g_signal_connect_closure_by_id (gpointer  instance,
1204                                 guint     signal_id,
1205                                 GQuark    detail,
1206                                 GClosure *closure,
1207                                 gboolean  after)
1208 {
1209   SignalNode *node;
1210   guint handler_id = 0;
1211
1212   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
1213   g_return_val_if_fail (signal_id > 0, 0);
1214   g_return_val_if_fail (closure != NULL, 0);
1215
1216   G_LOCK (g_signal_mutex);
1217   node = LOOKUP_SIGNAL_NODE (signal_id);
1218   if (node)
1219     {
1220       if (detail && !(node->flags & G_SIGNAL_DETAILED))
1221         g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
1222       else if (!g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
1223         g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
1224       else
1225         {
1226           Handler *handler = handler_new (after);
1227
1228           handler_id = handler->id;
1229           handler->detail = detail;
1230           handler->closure = g_closure_ref (closure);
1231           g_closure_sink (closure);
1232           handler_insert (signal_id, instance, handler);
1233           if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (closure))
1234             g_closure_set_marshal (closure, node->c_marshaller);
1235         }
1236     }
1237   else
1238     g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
1239   G_UNLOCK (g_signal_mutex);
1240
1241   return handler_id;
1242 }
1243
1244 guint
1245 g_signal_connect_closure (gpointer     instance,
1246                           const gchar *detailed_signal,
1247                           GClosure    *closure,
1248                           gboolean     after)
1249 {
1250   guint signal_id, handler_id = 0;
1251   GQuark detail = 0;
1252   GType itype;
1253
1254   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
1255   g_return_val_if_fail (detailed_signal != NULL, 0);
1256   g_return_val_if_fail (closure != NULL, 0);
1257
1258   G_LOCK (g_signal_mutex);
1259   itype = G_TYPE_FROM_INSTANCE (instance);
1260   signal_id = signal_parse_name (detailed_signal, itype, &detail, TRUE);
1261   if (signal_id)
1262     {
1263       SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
1264
1265       if (detail && !(node->flags & G_SIGNAL_DETAILED))
1266         g_warning ("%s: signal `%s' does not support details", G_STRLOC, detailed_signal);
1267       else if (!g_type_is_a (itype, node->itype))
1268         g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
1269       else
1270         {
1271           Handler *handler = handler_new (after);
1272
1273           handler_id = handler->id;
1274           handler->detail = detail;
1275           handler->closure = g_closure_ref (closure);
1276           g_closure_sink (closure);
1277           handler_insert (signal_id, instance, handler);
1278           if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (handler->closure))
1279             g_closure_set_marshal (handler->closure, node->c_marshaller);
1280         }
1281     }
1282   else
1283     g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
1284   G_UNLOCK (g_signal_mutex);
1285
1286   return handler_id;
1287 }
1288
1289 guint
1290 g_signal_connect_data (gpointer       instance,
1291                        const gchar   *detailed_signal,
1292                        GCallback      c_handler,
1293                        gpointer       data,
1294                        GClosureNotify destroy_data,
1295                        gboolean       swapped,
1296                        gboolean       after)
1297 {
1298   guint signal_id, handler_id = 0;
1299   GQuark detail = 0;
1300   GType itype;
1301
1302   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
1303   g_return_val_if_fail (detailed_signal != NULL, 0);
1304   g_return_val_if_fail (c_handler != NULL, 0);
1305
1306   G_LOCK (g_signal_mutex);
1307   itype = G_TYPE_FROM_INSTANCE (instance);
1308   signal_id = signal_parse_name (detailed_signal, itype, &detail, TRUE);
1309   if (signal_id)
1310     {
1311       SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
1312
1313       if (detail && !(node->flags & G_SIGNAL_DETAILED))
1314         g_warning ("%s: signal `%s' does not support details", G_STRLOC, detailed_signal);
1315       else if (!g_type_is_a (itype, node->itype))
1316         g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
1317       else
1318         {
1319           Handler *handler = handler_new (after);
1320
1321           handler_id = handler->id;
1322           handler->detail = detail;
1323           handler->closure = g_closure_ref ((swapped ? g_cclosure_new_swap : g_cclosure_new) (c_handler, data, destroy_data));
1324           g_closure_sink (handler->closure);
1325           handler_insert (signal_id, instance, handler);
1326           if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (handler->closure))
1327             g_closure_set_marshal (handler->closure, node->c_marshaller);
1328         }
1329     }
1330   else
1331     g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
1332   G_UNLOCK (g_signal_mutex);
1333
1334   return handler_id;
1335 }
1336
1337 void
1338 g_signal_handler_block (gpointer instance,
1339                         guint    handler_id)
1340 {
1341   Handler *handler;
1342
1343   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1344   g_return_if_fail (handler_id > 0);
1345
1346   G_LOCK (g_signal_mutex);
1347   handler = handler_lookup (instance, handler_id, NULL);
1348   if (handler)
1349     {
1350 #ifndef G_DISABLE_CHECKS
1351       if (handler->block_count >= HANDLER_MAX_BLOCK_COUNT - 1)
1352         g_error (G_STRLOC ": handler block_count overflow, %s", REPORT_BUG);
1353 #endif
1354
1355       handler->block_count += 1;
1356     }
1357   else
1358     g_warning ("%s: instance `%p' has no handler with id `%u'", G_STRLOC, instance, handler_id);
1359   G_UNLOCK (g_signal_mutex);
1360 }
1361
1362 void
1363 g_signal_handler_unblock (gpointer instance,
1364                           guint    handler_id)
1365 {
1366   Handler *handler;
1367
1368   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1369   g_return_if_fail (handler_id > 0);
1370
1371   G_LOCK (g_signal_mutex);
1372   handler = handler_lookup (instance, handler_id, NULL);
1373   if (handler)
1374     {
1375       if (handler->block_count)
1376         handler->block_count -= 1;
1377       else
1378         g_warning (G_STRLOC ": handler `%u' of instance `%p' is not blocked", handler_id, instance);
1379     }
1380   else
1381     g_warning ("%s: instance `%p' has no handler with id `%u'", G_STRLOC, instance, handler_id);
1382   G_UNLOCK (g_signal_mutex);
1383 }
1384
1385 void
1386 g_signal_handler_disconnect (gpointer instance,
1387                              guint    handler_id)
1388 {
1389   Handler *handler;
1390   guint signal_id;
1391
1392   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1393   g_return_if_fail (handler_id > 0);
1394
1395   G_LOCK (g_signal_mutex);
1396   handler = handler_lookup (instance, handler_id, &signal_id);
1397   if (handler)
1398     {
1399       handler->id = 0;
1400       handler->block_count = 1;
1401       handler_unref_R (signal_id, instance, handler);
1402     }
1403   else
1404     g_warning ("%s: instance `%p' has no handler with id `%u'", G_STRLOC, instance, handler_id);
1405   G_UNLOCK (g_signal_mutex);
1406 }
1407
1408 void
1409 g_signal_handlers_destroy (gpointer instance)
1410 {
1411   GBSearchArray *hlbsa;
1412
1413   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1414
1415   G_LOCK (g_signal_mutex);
1416   hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
1417   if (hlbsa)
1418     {
1419       guint i;
1420
1421       /* reentrancy caution, delete instance trace first */
1422       g_hash_table_remove (g_handler_list_bsa_ht, instance);
1423
1424       for (i = 0; i < hlbsa->n_nodes; i++)
1425         {
1426           HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, i);
1427           Handler *handler = hlist->handlers;
1428
1429           while (handler)
1430             {
1431               Handler *tmp = handler;
1432
1433               handler = tmp->next;
1434               tmp->block_count = 1;
1435               /* cruel unlink, this works because _all_ handlers vanish */
1436               tmp->next = NULL;
1437               tmp->prev = tmp;
1438               if (tmp->id)
1439                 {
1440                   tmp->id = 0;
1441                   handler_unref_R (0, NULL, tmp);
1442                 }
1443             }
1444         }
1445       g_bsearch_array_destroy (hlbsa);
1446     }
1447   G_UNLOCK (g_signal_mutex);
1448 }
1449
1450 guint
1451 g_signal_handler_find (gpointer         instance,
1452                        GSignalMatchType mask,
1453                        guint            signal_id,
1454                        GQuark           detail,
1455                        GClosure        *closure,
1456                        gpointer         func,
1457                        gpointer         data)
1458 {
1459   guint handler_id = 0;
1460
1461   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
1462   g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, 0);
1463
1464   if (mask & G_SIGNAL_MATCH_MASK)
1465     {
1466       HandlerMatch *mlist;
1467
1468       G_LOCK (g_signal_mutex);
1469       mlist = handlers_find (instance, mask, signal_id, detail, closure, func, data, TRUE);
1470       if (mlist)
1471         {
1472           handler_id = mlist->handler->id;
1473           handler_match_free1_R (mlist, instance);
1474         }
1475       G_UNLOCK (g_signal_mutex);
1476     }
1477
1478   return handler_id;
1479 }
1480
1481 static guint
1482 signal_handlers_foreach_matched_R (gpointer         instance,
1483                                    GSignalMatchType mask,
1484                                    guint            signal_id,
1485                                    GQuark           detail,
1486                                    GClosure        *closure,
1487                                    gpointer         func,
1488                                    gpointer         data,
1489                                    void           (*callback) (gpointer instance,
1490                                                                guint    handler_id))
1491 {
1492   HandlerMatch *mlist;
1493   guint n_handlers = 0;
1494
1495   mlist = handlers_find (instance, mask, signal_id, detail, closure, func, data, FALSE);
1496   while (mlist)
1497     {
1498       n_handlers++;
1499       G_UNLOCK (g_signal_mutex);
1500       callback (instance, mlist->handler->id);
1501       G_LOCK (g_signal_mutex);
1502       mlist = handler_match_free1_R (mlist, instance);
1503     }
1504
1505   return n_handlers;
1506 }
1507
1508 guint
1509 g_signal_handlers_block_matched (gpointer         instance,
1510                                  GSignalMatchType mask,
1511                                  guint            signal_id,
1512                                  GQuark           detail,
1513                                  GClosure        *closure,
1514                                  gpointer         func,
1515                                  gpointer         data)
1516 {
1517   guint n_handlers = 0;
1518
1519   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
1520   g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, FALSE);
1521
1522   if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
1523     {
1524       G_LOCK (g_signal_mutex);
1525       n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
1526                                                       closure, func, data,
1527                                                       g_signal_handler_block);
1528       G_UNLOCK (g_signal_mutex);
1529     }
1530
1531   return n_handlers;
1532 }
1533
1534 guint
1535 g_signal_handlers_unblock_matched (gpointer         instance,
1536                                    GSignalMatchType mask,
1537                                    guint            signal_id,
1538                                    GQuark           detail,
1539                                    GClosure        *closure,
1540                                    gpointer         func,
1541                                    gpointer         data)
1542 {
1543   guint n_handlers = 0;
1544
1545   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
1546   g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, FALSE);
1547
1548   if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
1549     {
1550       G_LOCK (g_signal_mutex);
1551       n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
1552                                                       closure, func, data,
1553                                                       g_signal_handler_unblock);
1554       G_UNLOCK (g_signal_mutex);
1555     }
1556
1557   return n_handlers;
1558 }
1559
1560 guint
1561 g_signal_handlers_disconnect_matched (gpointer         instance,
1562                                       GSignalMatchType mask,
1563                                       guint            signal_id,
1564                                       GQuark           detail,
1565                                       GClosure        *closure,
1566                                       gpointer         func,
1567                                       gpointer         data)
1568 {
1569   guint n_handlers = 0;
1570
1571   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
1572   g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, FALSE);
1573
1574   if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
1575     {
1576       G_LOCK (g_signal_mutex);
1577       n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
1578                                                       closure, func, data,
1579                                                       g_signal_handler_disconnect);
1580       G_UNLOCK (g_signal_mutex);
1581     }
1582
1583   return n_handlers;
1584 }
1585
1586 gboolean
1587 g_signal_has_handler_pending (gpointer instance,
1588                               guint    signal_id,
1589                               GQuark   detail,
1590                               gboolean may_be_blocked)
1591 {
1592   HandlerMatch *mlist;
1593   gboolean has_pending;
1594
1595   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
1596   g_return_val_if_fail (signal_id > 0, FALSE);
1597
1598   G_LOCK (g_signal_mutex);
1599   if (detail)
1600     {
1601       SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
1602
1603       if (!(node->flags & G_SIGNAL_DETAILED))
1604         {
1605           g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
1606           G_UNLOCK (g_signal_mutex);
1607           return FALSE;
1608         }
1609     }
1610   mlist = handlers_find (instance,
1611                          (G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DETAIL | (may_be_blocked ? 0 : G_SIGNAL_MATCH_UNBLOCKED)),
1612                          signal_id, detail, NULL, NULL, NULL, TRUE);
1613   if (mlist)
1614     {
1615       has_pending = TRUE;
1616       handler_match_free1_R (mlist, instance);
1617     }
1618   else
1619     has_pending = FALSE;
1620   G_UNLOCK (g_signal_mutex);
1621
1622   return has_pending;
1623 }
1624
1625 void
1626 g_signal_emitv (const GValue *instance_and_params,
1627                 guint         signal_id,
1628                 GQuark        detail,
1629                 GValue       *return_value)
1630 {
1631   const GValue *param_values;
1632   gpointer instance;
1633   SignalNode *node;
1634   guint i;
1635
1636   g_return_if_fail (instance_and_params != NULL);
1637   instance = g_value_peek_pointer (instance_and_params);
1638   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1639   g_return_if_fail (signal_id > 0);
1640
1641   param_values = instance_and_params + 1;
1642
1643   G_LOCK (g_signal_mutex);
1644   node = LOOKUP_SIGNAL_NODE (signal_id);
1645   if (!node || !g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
1646     {
1647       g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
1648       G_UNLOCK (g_signal_mutex);
1649       return;
1650     }
1651 #ifdef G_ENABLE_DEBUG
1652   if (detail && !(node->flags & G_SIGNAL_DETAILED))
1653     {
1654       g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
1655       G_UNLOCK (g_signal_mutex);
1656       return;
1657     }
1658   for (i = 0; i < node->n_params; i++)
1659     if (!G_TYPE_CHECK_VALUE_TYPE (param_values + i, node->param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE))
1660       {
1661         g_critical ("%s: value for `%s' parameter %u for signal \"%s\" is of type `%s'",
1662                     G_STRLOC,
1663                     g_type_name (node->param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE),
1664                     i,
1665                     node->name,
1666                     G_VALUE_TYPE_NAME (param_values + i));
1667         G_UNLOCK (g_signal_mutex);
1668         return;
1669       }
1670   if (node->return_type != G_TYPE_NONE)
1671     {
1672       if (!return_value)
1673         {
1674           g_critical ("%s: return value `%s' for signal \"%s\" is (NULL)",
1675                       G_STRLOC,
1676                       g_type_name (node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE),
1677                       node->name);
1678           G_UNLOCK (g_signal_mutex);
1679           return;
1680         }
1681       else if (!node->accumulator && !G_TYPE_CHECK_VALUE_TYPE (return_value, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE))
1682         {
1683           g_critical ("%s: return value `%s' for signal \"%s\" is of type `%s'",
1684                       G_STRLOC,
1685                       g_type_name (node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE),
1686                       node->name,
1687                       G_VALUE_TYPE_NAME (return_value));
1688           G_UNLOCK (g_signal_mutex);
1689           return;
1690         }
1691     }
1692   else
1693     return_value = NULL;
1694 #endif  /* G_ENABLE_DEBUG */
1695
1696   signal_emit_R (node, detail, instance, return_value, instance_and_params);
1697   G_UNLOCK (g_signal_mutex);
1698 }
1699
1700 void
1701 g_signal_emit_valist (gpointer instance,
1702                       guint    signal_id,
1703                       GQuark   detail,
1704                       va_list  var_args)
1705 {
1706   GValue *instance_and_params, stack_values[MAX_STACK_VALUES], *free_me = NULL;
1707   GValue *param_values;
1708   SignalNode *node;
1709   guint i;
1710
1711   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1712   g_return_if_fail (signal_id > 0);
1713
1714   G_LOCK (g_signal_mutex);
1715   node = LOOKUP_SIGNAL_NODE (signal_id);
1716   if (!node || !g_type_is_a (G_TYPE_FROM_INSTANCE (instance), node->itype))
1717     {
1718       g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
1719       G_UNLOCK (g_signal_mutex);
1720       return;
1721     }
1722 #ifndef G_DISABLE_CHECKS
1723   if (detail && !(node->flags & G_SIGNAL_DETAILED))
1724     {
1725       g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
1726       G_UNLOCK (g_signal_mutex);
1727       return;
1728     }
1729 #endif  /* !G_DISABLE_CHECKS */
1730
1731   if (node->n_params < MAX_STACK_VALUES)
1732     instance_and_params = stack_values;
1733   else
1734     {
1735       free_me = g_new (GValue, node->n_params + 1);
1736       instance_and_params = free_me;
1737     }
1738   param_values = instance_and_params + 1;
1739   for (i = 0; i < node->n_params; i++)
1740     {
1741       gchar *error;
1742
1743       param_values[i].g_type = 0;
1744       g_value_init (param_values + i, node->param_types[i] & ~G_SIGNAL_TYPE_STATIC_SCOPE);
1745       G_VALUE_COLLECT (param_values + i,
1746                        var_args,
1747                        node->param_types[i] & G_SIGNAL_TYPE_STATIC_SCOPE ? G_VALUE_NOCOPY_CONTENTS : 0,
1748                        &error);
1749       if (error)
1750         {
1751           g_warning ("%s: %s", G_STRLOC, error);
1752           g_free (error);
1753
1754           /* we purposely leak the value here, it might not be
1755            * in a sane state if an error condition occoured
1756            */
1757           while (i--)
1758             g_value_unset (param_values + i);
1759
1760           G_UNLOCK (g_signal_mutex);
1761           g_free (free_me);
1762           return;
1763         }
1764     }
1765   instance_and_params->g_type = 0;
1766   g_value_init (instance_and_params, G_TYPE_FROM_INSTANCE (instance));
1767   g_value_set_instance (instance_and_params, instance);
1768   if (node->return_type == G_TYPE_NONE)
1769     signal_emit_R (node, detail, instance, NULL, instance_and_params);
1770   else
1771     {
1772       GValue return_value = { 0, };
1773       gchar *error = NULL;
1774
1775       g_value_init (&return_value, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE);
1776       if (signal_emit_R (node, detail, instance, &return_value, instance_and_params))
1777         G_VALUE_LCOPY (&return_value,
1778                        var_args,
1779                        node->return_type & G_SIGNAL_TYPE_STATIC_SCOPE ? G_VALUE_NOCOPY_CONTENTS : 0,
1780                        &error);
1781       if (!error)
1782         g_value_unset (&return_value);
1783       else
1784         {
1785           g_warning ("%s: %s", G_STRLOC, error);
1786           g_free (error);
1787
1788           /* we purposely leak the value here, it might not be
1789            * in a sane state if an error condition occoured
1790            */
1791         }
1792     }
1793   for (i = 0; i < node->n_params; i++)
1794     g_value_unset (param_values + i);
1795   g_value_unset (instance_and_params);
1796   if (free_me)
1797     g_free (free_me);
1798   G_UNLOCK (g_signal_mutex);
1799 }
1800
1801 void
1802 g_signal_emit (gpointer instance,
1803                guint    signal_id,
1804                GQuark   detail,
1805                ...)
1806 {
1807   va_list var_args;
1808
1809   va_start (var_args, detail);
1810   g_signal_emit_valist (instance, signal_id, detail, var_args);
1811   va_end (var_args);
1812 }
1813
1814 void
1815 g_signal_emit_by_name (gpointer     instance,
1816                        const gchar *detailed_signal,
1817                        ...)
1818 {
1819   GQuark detail = 0;
1820   guint signal_id;
1821
1822   g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
1823   g_return_if_fail (detailed_signal != NULL);
1824
1825   G_LOCK (g_signal_mutex);
1826   signal_id = signal_parse_name (detailed_signal, G_TYPE_FROM_INSTANCE (instance), &detail, TRUE);
1827   G_UNLOCK (g_signal_mutex);
1828
1829   if (signal_id)
1830     {
1831       va_list var_args;
1832
1833       va_start (var_args, detailed_signal);
1834       g_signal_emit_valist (instance, signal_id, detail, var_args);
1835       va_end (var_args);
1836     }
1837   else
1838     g_warning ("%s: signal name `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
1839 }
1840
1841 static inline gboolean
1842 accumulate (GSignalInvocationHint *ihint,
1843             GValue                *return_accu,
1844             GValue                *handler_return,
1845             SignalAccumulator     *accumulator)
1846 {
1847   gboolean continue_emission;
1848
1849   if (!accumulator)
1850     return TRUE;
1851
1852   continue_emission = accumulator->func (ihint, return_accu, handler_return, accumulator->data);
1853   g_value_reset (handler_return);
1854
1855   return continue_emission;
1856 }
1857
1858 static gboolean
1859 signal_emit_R (SignalNode   *node,
1860                GQuark        detail,
1861                gpointer      instance,
1862                GValue       *emission_return,
1863                const GValue *instance_and_params)
1864 {
1865   EmissionState emission_state = 0;
1866   SignalAccumulator *accumulator;
1867   GSignalInvocationHint ihint;
1868   GClosure *class_closure;
1869   HandlerList *hlist;
1870   Handler *handler_list = NULL;
1871   GValue *return_accu, accu = { 0, };
1872   guint signal_id = node->signal_id;
1873   gboolean return_value_altered = FALSE;
1874
1875 #ifdef  G_ENABLE_DEBUG
1876   IF_DEBUG (SIGNALS, g_trace_instance_signals == instance || g_trap_instance_signals == instance)
1877     {
1878       g_message ("%s::%s(%u) emitted (instance=%p, signal-node=%p)",
1879                  g_type_name (G_TYPE_FROM_INSTANCE (instance)),
1880                  node->name, detail,
1881                  instance, node);
1882       if (g_trap_instance_signals == instance)
1883         G_BREAKPOINT ();
1884     }
1885 #endif  /* G_ENABLE_DEBUG */
1886
1887   if (node->flags & G_SIGNAL_NO_RECURSE)
1888     {
1889       Emission *emission = emission_find (g_restart_emissions, signal_id, detail, instance);
1890
1891       if (emission)
1892         {
1893           *emission->state_p = EMISSION_RESTART;
1894           return return_value_altered;
1895         }
1896     }
1897   ihint.signal_id = node->signal_id;
1898   ihint.detail = detail;
1899   accumulator = node->accumulator;
1900   if (accumulator)
1901     {
1902       g_value_init (&accu, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE);
1903       return_accu = &accu;
1904     }
1905   else
1906     return_accu = emission_return;
1907   emission_push ((node->flags & G_SIGNAL_NO_RECURSE) ? &g_restart_emissions : &g_recursive_emissions,
1908                  signal_id, detail, instance, &emission_state);
1909   class_closure = node->class_closure;
1910
1911  EMIT_RESTART:
1912
1913   if (handler_list)
1914     handler_unref_R (signal_id, instance, handler_list);
1915   hlist = handler_list_lookup (signal_id, instance);
1916   handler_list = hlist ? hlist->handlers : NULL;
1917   if (handler_list)
1918     handler_ref (handler_list);
1919
1920   ihint.run_type = G_SIGNAL_RUN_FIRST;
1921
1922   if ((node->flags & G_SIGNAL_RUN_FIRST) && class_closure)
1923     {
1924       emission_state = EMISSION_RUN;
1925
1926       G_UNLOCK (g_signal_mutex);
1927       g_closure_invoke (class_closure,
1928                         return_accu,
1929                         node->n_params + 1,
1930                         instance_and_params,
1931                         &ihint);
1932       if (!accumulate (&ihint, emission_return, &accu, accumulator) &&
1933           emission_state == EMISSION_RUN)
1934         emission_state = EMISSION_STOP;
1935       G_LOCK (g_signal_mutex);
1936       return_value_altered = TRUE;
1937
1938       if (emission_state == EMISSION_STOP)
1939         goto EMIT_CLEANUP;
1940       else if (emission_state == EMISSION_RESTART)
1941         goto EMIT_RESTART;
1942     }
1943
1944   if (node->emission_hooks)
1945     {
1946       gboolean need_destroy, was_in_call, may_recurse = TRUE;
1947       GHook *hook;
1948
1949       emission_state = EMISSION_HOOK;
1950       hook = g_hook_first_valid (node->emission_hooks, may_recurse);
1951       while (hook)
1952         {
1953           SignalHook *signal_hook = SIGNAL_HOOK (hook);
1954
1955           if (!signal_hook->detail || signal_hook->detail == detail)
1956             {
1957               GSignalEmissionHook hook_func = hook->func;
1958
1959               was_in_call = G_HOOK_IN_CALL (hook);
1960               hook->flags |= G_HOOK_FLAG_IN_CALL;
1961               G_UNLOCK (g_signal_mutex);
1962               need_destroy = !hook_func (&ihint, node->n_params + 1, instance_and_params, hook->data);
1963               G_LOCK (g_signal_mutex);
1964               if (!was_in_call)
1965                 hook->flags &= ~G_HOOK_FLAG_IN_CALL;
1966               if (need_destroy)
1967                 g_hook_destroy_link (node->emission_hooks, hook);
1968             }
1969           hook = g_hook_next_valid (node->emission_hooks, hook, may_recurse);
1970         }
1971
1972       if (emission_state == EMISSION_RESTART)
1973         goto EMIT_RESTART;
1974     }
1975
1976   if (handler_list)
1977     {
1978       Handler *handler = handler_list;
1979
1980       emission_state = EMISSION_RUN;
1981       handler_ref (handler);
1982       do
1983         {
1984           Handler *tmp;
1985
1986           if (handler->after)
1987             {
1988               handler_unref_R (signal_id, instance, handler_list);
1989               handler_list = handler;
1990               break;
1991             }
1992           else if (!handler->block_count && (!handler->detail || handler->detail == detail))
1993             {
1994               G_UNLOCK (g_signal_mutex);
1995               g_closure_invoke (handler->closure,
1996                                 return_accu,
1997                                 node->n_params + 1,
1998                                 instance_and_params,
1999                                 &ihint);
2000               if (!accumulate (&ihint, emission_return, &accu, accumulator) &&
2001                   emission_state == EMISSION_RUN)
2002                 emission_state = EMISSION_STOP;
2003               G_LOCK (g_signal_mutex);
2004               return_value_altered = TRUE;
2005
2006               tmp = emission_state == EMISSION_RUN ? handler->next : NULL;
2007             }
2008           else
2009             tmp = handler->next;
2010
2011           if (tmp)
2012             handler_ref (tmp);
2013           handler_unref_R (signal_id, instance, handler_list);
2014           handler_list = handler;
2015           handler = tmp;
2016         }
2017       while (handler);
2018
2019       if (emission_state == EMISSION_STOP)
2020         goto EMIT_CLEANUP;
2021       else if (emission_state == EMISSION_RESTART)
2022         goto EMIT_RESTART;
2023     }
2024
2025   ihint.run_type = G_SIGNAL_RUN_LAST;
2026
2027   if ((node->flags & G_SIGNAL_RUN_LAST) && class_closure)
2028     {
2029       emission_state = EMISSION_RUN;
2030
2031       G_UNLOCK (g_signal_mutex);
2032       g_closure_invoke (class_closure,
2033                         return_accu,
2034                         node->n_params + 1,
2035                         instance_and_params,
2036                         &ihint);
2037       if (!accumulate (&ihint, emission_return, &accu, accumulator) &&
2038           emission_state == EMISSION_RUN)
2039         emission_state = EMISSION_STOP;
2040       G_LOCK (g_signal_mutex);
2041       return_value_altered = TRUE;
2042
2043       if (emission_state == EMISSION_STOP)
2044         goto EMIT_CLEANUP;
2045       else if (emission_state == EMISSION_RESTART)
2046         goto EMIT_RESTART;
2047     }
2048
2049   if (handler_list)
2050     {
2051       Handler *handler = handler_list;
2052
2053       emission_state = EMISSION_RUN;
2054       handler_ref (handler);
2055       do
2056         {
2057           Handler *tmp;
2058
2059           if (handler->after && !handler->block_count && (!handler->detail || handler->detail == detail))
2060             {
2061               G_UNLOCK (g_signal_mutex);
2062               g_closure_invoke (handler->closure,
2063                                 return_accu,
2064                                 node->n_params + 1,
2065                                 instance_and_params,
2066                                 &ihint);
2067               if (!accumulate (&ihint, emission_return, &accu, accumulator) &&
2068                   emission_state == EMISSION_RUN)
2069                 emission_state = EMISSION_STOP;
2070               G_LOCK (g_signal_mutex);
2071               return_value_altered = TRUE;
2072
2073               tmp = emission_state == EMISSION_RUN ? handler->next : NULL;
2074             }
2075           else
2076             tmp = handler->next;
2077
2078           if (tmp)
2079             handler_ref (tmp);
2080           handler_unref_R (signal_id, instance, handler);
2081           handler = tmp;
2082         }
2083       while (handler);
2084
2085       if (emission_state == EMISSION_STOP)
2086         goto EMIT_CLEANUP;
2087       else if (emission_state == EMISSION_RESTART)
2088         goto EMIT_RESTART;
2089     }
2090
2091  EMIT_CLEANUP:
2092
2093   ihint.run_type = G_SIGNAL_RUN_CLEANUP;
2094
2095   if ((node->flags & G_SIGNAL_RUN_CLEANUP) && class_closure)
2096     {
2097       gboolean need_unset = FALSE;
2098
2099       emission_state = EMISSION_STOP;
2100
2101       G_UNLOCK (g_signal_mutex);
2102       if (node->return_type != G_TYPE_NONE && !accumulator)
2103         {
2104           g_value_init (&accu, node->return_type & ~G_SIGNAL_TYPE_STATIC_SCOPE);
2105           need_unset = TRUE;
2106         }
2107       g_closure_invoke (class_closure,
2108                         node->return_type != G_TYPE_NONE ? &accu : NULL,
2109                         node->n_params + 1,
2110                         instance_and_params,
2111                         &ihint);
2112       if (need_unset)
2113         g_value_unset (&accu);
2114       G_LOCK (g_signal_mutex);
2115
2116       if (emission_state == EMISSION_RESTART)
2117         goto EMIT_RESTART;
2118     }
2119
2120   if (handler_list)
2121     handler_unref_R (signal_id, instance, handler_list);
2122
2123   emission_pop ((node->flags & G_SIGNAL_NO_RECURSE) ? &g_restart_emissions : &g_recursive_emissions, &emission_state);
2124   if (accumulator)
2125     g_value_unset (&accu);
2126
2127   return return_value_altered;
2128 }
2129
2130
2131 /* --- compile standard marshallers --- */
2132 #include        "gobject.h"
2133 #include        "genums.h"
2134 #include        "gmarshal.c"