glib/gthread.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * 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 Public
  15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  20  * file for a list of people on the GLib Team.  See the ChangeLog
  21  * files for a list of changes.  These files are distributed with
  22  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  23  */
  24
  25 #ifndef __G_THREAD_H__
  26 #define __G_THREAD_H__
  27
  28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  29 #error "Only <glib.h> can be included directly."
  30 #endif
  31
  32 #include <glib/gatomic.h>
  33 #include <glib/gerror.h>
  34
  35 G_BEGIN_DECLS
  36
  37 #define G_THREAD_ERROR g_thread_error_quark ()
  38 GLIB_AVAILABLE_IN_ALL
  39 GQuark g_thread_error_quark (void);
  40
  41 typedef enum
  42 {
  43   G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
  44 } GThreadError;
  45
  46 typedef gpointer (*GThreadFunc) (gpointer data);
  47
  48 typedef struct _GThread         GThread;
  49
  50 typedef union  _GMutex          GMutex;
  51 typedef struct _GRecMutex       GRecMutex;
  52 typedef struct _GRWLock         GRWLock;
  53 typedef struct _GCond           GCond;
  54 typedef struct _GPrivate        GPrivate;
  55 typedef struct _GOnce           GOnce;
  56
  57 union _GMutex
  58 {
  59   /*< private >*/
  60   gpointer p;
  61   guint i[2];
  62 };
  63
  64 struct _GRWLock
  65 {
  66   /*< private >*/
  67   gpointer p;
  68   guint i[2];
  69 };
  70
  71 struct _GCond
  72 {
  73   /*< private >*/
  74   gpointer p;
  75   guint i[2];
  76 };
  77
  78 struct _GRecMutex
  79 {
  80   /*< private >*/
  81   gpointer p;
  82   guint i[2];
  83 };
  84
  85 #define G_PRIVATE_INIT(notify) { NULL, (notify), { NULL, NULL } }
  86 struct _GPrivate
  87 {
  88   /*< private >*/
  89   gpointer       p;
  90   GDestroyNotify notify;
  91   gpointer future[2];
  92 };
  93
  94 typedef enum
  95 {
  96   G_ONCE_STATUS_NOTCALLED,
  97   G_ONCE_STATUS_PROGRESS,
  98   G_ONCE_STATUS_READY
  99 } GOnceStatus;
 100
 101 #define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
 102 struct _GOnce
 103 {
 104   volatile GOnceStatus status;
 105   volatile gpointer retval;
 106 };
 107
 108 #define G_LOCK_NAME(name)             g__ ## name ## _lock
 109 #define G_LOCK_DEFINE_STATIC(name)    static G_LOCK_DEFINE (name)
 110 #define G_LOCK_DEFINE(name)           GMutex G_LOCK_NAME (name)
 111 #define G_LOCK_EXTERN(name)           extern GMutex G_LOCK_NAME (name)
 112
 113 #ifdef G_DEBUG_LOCKS
 114 #  define G_LOCK(name)                G_STMT_START{             \
 115       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 116              "file %s: line %d (%s): locking: %s ",             \
 117              __FILE__,        __LINE__, G_STRFUNC,              \
 118              #name);                                            \
 119       g_mutex_lock (&G_LOCK_NAME (name));                       \
 120    }G_STMT_END
 121 #  define G_UNLOCK(name)              G_STMT_START{             \
 122       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 123              "file %s: line %d (%s): unlocking: %s ",           \
 124              __FILE__,        __LINE__, G_STRFUNC,              \
 125              #name);                                            \
 126      g_mutex_unlock (&G_LOCK_NAME (name));                      \
 127    }G_STMT_END
 128 #  define G_TRYLOCK(name)                                       \
 129       (g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                  \
 130              "file %s: line %d (%s): try locking: %s ",         \
 131              __FILE__,        __LINE__, G_STRFUNC,              \
 132              #name), g_mutex_trylock (&G_LOCK_NAME (name)))
 133 #else  /* !G_DEBUG_LOCKS */
 134 #  define G_LOCK(name) g_mutex_lock       (&G_LOCK_NAME (name))
 135 #  define G_UNLOCK(name) g_mutex_unlock   (&G_LOCK_NAME (name))
 136 #  define G_TRYLOCK(name) g_mutex_trylock (&G_LOCK_NAME (name))
 137 #endif /* !G_DEBUG_LOCKS */
 138
 139 GLIB_AVAILABLE_IN_2_32
 140 GThread *       g_thread_ref                    (GThread        *thread);
 141 GLIB_AVAILABLE_IN_2_32
 142 void            g_thread_unref                  (GThread        *thread);
 143 GLIB_AVAILABLE_IN_2_32
 144 GThread *       g_thread_new                    (const gchar    *name,
 145                                                  GThreadFunc     func,
 146                                                  gpointer        data);
 147 GLIB_AVAILABLE_IN_2_32
 148 GThread *       g_thread_try_new                (const gchar    *name,
 149                                                  GThreadFunc     func,
 150                                                  gpointer        data,
 151                                                  GError        **error);
 152 GLIB_AVAILABLE_IN_ALL
 153 GThread *       g_thread_self                   (void);
 154 GLIB_AVAILABLE_IN_ALL
 155 void            g_thread_exit                   (gpointer        retval);
 156 GLIB_AVAILABLE_IN_ALL
 157 gpointer        g_thread_join                   (GThread        *thread);
 158 GLIB_AVAILABLE_IN_ALL
 159 void            g_thread_yield                  (void);
 160
 161
 162 GLIB_AVAILABLE_IN_2_32
 163 void            g_mutex_init                    (GMutex         *mutex);
 164 GLIB_AVAILABLE_IN_2_32
 165 void            g_mutex_clear                   (GMutex         *mutex);
 166 GLIB_AVAILABLE_IN_ALL
 167 void            g_mutex_lock                    (GMutex         *mutex);
 168 GLIB_AVAILABLE_IN_ALL
 169 gboolean        g_mutex_trylock                 (GMutex         *mutex);
 170 GLIB_AVAILABLE_IN_ALL
 171 void            g_mutex_unlock                  (GMutex         *mutex);
 172
 173 GLIB_AVAILABLE_IN_2_32
 174 void            g_rw_lock_init                  (GRWLock        *rw_lock);
 175 GLIB_AVAILABLE_IN_2_32
 176 void            g_rw_lock_clear                 (GRWLock        *rw_lock);
 177 GLIB_AVAILABLE_IN_2_32
 178 void            g_rw_lock_writer_lock           (GRWLock        *rw_lock);
 179 GLIB_AVAILABLE_IN_2_32
 180 gboolean        g_rw_lock_writer_trylock        (GRWLock        *rw_lock);
 181 GLIB_AVAILABLE_IN_2_32
 182 void            g_rw_lock_writer_unlock         (GRWLock        *rw_lock);
 183 GLIB_AVAILABLE_IN_2_32
 184 void            g_rw_lock_reader_lock           (GRWLock        *rw_lock);
 185 GLIB_AVAILABLE_IN_2_32
 186 gboolean        g_rw_lock_reader_trylock        (GRWLock        *rw_lock);
 187 GLIB_AVAILABLE_IN_2_32
 188 void            g_rw_lock_reader_unlock         (GRWLock        *rw_lock);
 189
 190 GLIB_AVAILABLE_IN_2_32
 191 void            g_rec_mutex_init                (GRecMutex      *rec_mutex);
 192 GLIB_AVAILABLE_IN_2_32
 193 void            g_rec_mutex_clear               (GRecMutex      *rec_mutex);
 194 GLIB_AVAILABLE_IN_2_32
 195 void            g_rec_mutex_lock                (GRecMutex      *rec_mutex);
 196 GLIB_AVAILABLE_IN_2_32
 197 gboolean        g_rec_mutex_trylock             (GRecMutex      *rec_mutex);
 198 GLIB_AVAILABLE_IN_2_32
 199 void            g_rec_mutex_unlock              (GRecMutex      *rec_mutex);
 200
 201 GLIB_AVAILABLE_IN_2_32
 202 void            g_cond_init                     (GCond          *cond);
 203 GLIB_AVAILABLE_IN_2_32
 204 void            g_cond_clear                    (GCond          *cond);
 205 GLIB_AVAILABLE_IN_ALL
 206 void            g_cond_wait                     (GCond          *cond,
 207                                                  GMutex         *mutex);
 208 GLIB_AVAILABLE_IN_ALL
 209 void            g_cond_signal                   (GCond          *cond);
 210 GLIB_AVAILABLE_IN_ALL
 211 void            g_cond_broadcast                (GCond          *cond);
 212 GLIB_AVAILABLE_IN_2_32
 213 gboolean        g_cond_wait_until               (GCond          *cond,
 214                                                  GMutex         *mutex,
 215                                                  gint64          end_time);
 216
 217 GLIB_AVAILABLE_IN_ALL
 218 gpointer        g_private_get                   (GPrivate       *key);
 219 GLIB_AVAILABLE_IN_ALL
 220 void            g_private_set                   (GPrivate       *key,
 221                                                  gpointer        value);
 222 GLIB_AVAILABLE_IN_2_32
 223 void            g_private_replace               (GPrivate       *key,
 224                                                  gpointer        value);
 225
 226 GLIB_AVAILABLE_IN_ALL
 227 gpointer        g_once_impl                     (GOnce          *once,
 228                                                  GThreadFunc     func,
 229                                                  gpointer        arg);
 230 GLIB_AVAILABLE_IN_ALL
 231 gboolean        g_once_init_enter               (volatile void  *location);
 232 GLIB_AVAILABLE_IN_ALL
 233 void            g_once_init_leave               (volatile void  *location,
 234                                                  gsize           result);
 235
 236 #ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
 237 # define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
 238 #else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
 239 # define g_once(once, func, arg) \
 240   (((once)->status == G_ONCE_STATUS_READY) ? \
 241    (once)->retval : \
 242    g_once_impl ((once), (func), (arg)))
 243 #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
 244
 245 #ifdef __GNUC__
 246 # define g_once_init_enter(location) \
 247   (G_GNUC_EXTENSION ({                                               \
 248     G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer));       \
 249     (void) (0 ? (gpointer) *(location) : 0);                         \
 250     (!g_atomic_pointer_get (location) &&                             \
 251      g_once_init_enter (location));                                  \
 252   }))
 253 # define g_once_init_leave(location, result) \
 254   (G_GNUC_EXTENSION ({                                               \
 255     G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer));       \
 256     (void) (0 ? *(location) = (result) : 0);                         \
 257     g_once_init_leave ((location), (gsize) (result));                \
 258   }))
 259 #else
 260 # define g_once_init_enter(location) \
 261   (g_once_init_enter((location)))
 262 # define g_once_init_leave(location, result) \
 263   (g_once_init_leave((location), (gsize) (result)))
 264 #endif
 265
 266 GLIB_AVAILABLE_IN_2_36
 267 guint          g_get_num_processors (void);
 268
 269 G_END_DECLS
 270
 271 #endif /* __G_THREAD_H__ */