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
   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 Public
  15  * 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
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  28 #error "Only <glib.h> can be included directly."
  29 #endif
  30
  31 #ifndef __G_THREAD_H__
  32 #define __G_THREAD_H__
  33
  34 #include <glib/gerror.h>
  35 #include <glib/gutils.h>        /* for G_INLINE_FUNC */
  36 #include <glib/gatomic.h>       /* for g_atomic_pointer_get */
  37
  38 G_BEGIN_DECLS
  39
  40 /* GLib Thread support
  41  */
  42
  43 extern GQuark g_thread_error_quark (void);
  44 #define G_THREAD_ERROR g_thread_error_quark ()
  45
  46 typedef enum
  47 {
  48   G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
  49 } GThreadError;
  50
  51 typedef gpointer (*GThreadFunc) (gpointer data);
  52
  53 typedef struct _GThread         GThread;
  54
  55 typedef struct _GMutex          GMutex;
  56 typedef struct _GRecMutex       GRecMutex;
  57 typedef struct _GRWLock         GRWLock;
  58 typedef struct _GCond           GCond;
  59 typedef struct _GPrivate        GPrivate;
  60 typedef struct _GStaticPrivate  GStaticPrivate;
  61
  62 #ifdef G_OS_WIN32
  63
  64 #define G_MUTEX_INIT { NULL }
  65 struct _GMutex
  66 {
  67   gpointer impl;
  68 };
  69
  70 #define G_RW_LOCK_INIT { NULL }
  71 struct _GRWLock
  72 {
  73   gpointer impl;
  74 };
  75
  76 #define G_COND_INIT { NULL }
  77 struct _GCond
  78 {
  79   gpointer impl;
  80 };
  81 #else
  82
  83 #include <pthread.h>
  84
  85 #ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
  86 #define G_MUTEX_INIT { PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP }
  87 #else
  88 #define G_MUTEX_INIT { PTHREAD_MUTEX_INITIALIZER }
  89 #endif
  90 struct _GMutex
  91 {
  92   pthread_mutex_t impl;
  93 };
  94
  95 #define G_RW_LOCK_INIT { PTHREAD_RWLOCK_INITIALIZER }
  96 struct _GRWLock
  97 {
  98   pthread_rwlock_t impl;
  99 };
 100
 101 #define G_COND_INIT { PTHREAD_COND_INITIALIZER }
 102 struct _GCond
 103 {
 104   pthread_cond_t impl;
 105 };
 106
 107 #endif
 108
 109 #define G_REC_MUTEX_INIT { NULL }
 110 struct _GRecMutex
 111 {
 112   gpointer impl;
 113 };
 114
 115 #define G_PRIVATE_INIT(notify) { NULL, (notify), { NULL, NULL } }
 116 struct _GPrivate
 117 {
 118   gpointer       p;
 119   GDestroyNotify notify;
 120   gpointer future[2];
 121 };
 122
 123 void     g_thread_init   (gpointer vtable);
 124
 125 gboolean g_thread_get_initialized (void);
 126
 127 GLIB_VAR gboolean g_threads_got_initialized;
 128
 129 #if defined(G_THREADS_MANDATORY)
 130 #define g_thread_supported()     1
 131 #else
 132 #define g_thread_supported()    (g_threads_got_initialized)
 133 #endif
 134
 135 GMutex* g_static_mutex_get_mutex_impl   (GMutex **mutex);
 136
 137 GThread *g_thread_new                    (const gchar  *name,
 138                                           GThreadFunc   func,
 139                                           gpointer      data,
 140                                           gboolean      joinable,
 141                                           GError      **error);
 142
 143 GThread *g_thread_new_full               (const gchar  *name,
 144                                           GThreadFunc   func,
 145                                           gpointer      data,
 146                                           gboolean      joinable,
 147                                           gsize         stack_size,
 148                                           GError      **error);
 149
 150 GThread* g_thread_self                   (void);
 151 void     g_thread_exit                   (gpointer      retval);
 152 gpointer g_thread_join                   (GThread      *thread);
 153 void     g_thread_yield                  (void);
 154
 155 typedef enum
 156 {
 157   G_ONCE_STATUS_NOTCALLED,
 158   G_ONCE_STATUS_PROGRESS,
 159   G_ONCE_STATUS_READY
 160 } GOnceStatus;
 161
 162 typedef struct _GOnce GOnce;
 163 struct _GOnce
 164 {
 165   volatile GOnceStatus status;
 166   volatile gpointer retval;
 167 };
 168
 169 #define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
 170
 171 gpointer g_once_impl (GOnce *once, GThreadFunc func, gpointer arg);
 172
 173 #ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
 174 # define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
 175 #else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
 176 # define g_once(once, func, arg) \
 177   (((once)->status == G_ONCE_STATUS_READY) ? \
 178    (once)->retval : \
 179    g_once_impl ((once), (func), (arg)))
 180 #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
 181
 182 /* initialize-once guards, keyed by value_location */
 183 G_INLINE_FUNC gboolean  g_once_init_enter       (volatile gsize *value_location);
 184 gboolean                g_once_init_enter_impl  (volatile gsize *value_location);
 185 void                    g_once_init_leave       (volatile gsize *value_location,
 186                                                  gsize           initialization_value);
 187 #if defined (G_CAN_INLINE) || defined (__G_THREAD_C__)
 188 G_INLINE_FUNC gboolean
 189 g_once_init_enter (volatile gsize *value_location)
 190 {
 191   if G_LIKELY ((gpointer) g_atomic_pointer_get (value_location) != NULL)
 192     return FALSE;
 193   else
 194     return g_once_init_enter_impl (value_location);
 195 }
 196 #endif /* G_CAN_INLINE || __G_THREAD_C__ */
 197
 198 #define G_LOCK_NAME(name)               g__ ## name ## _lock
 199 #define G_LOCK_DEFINE_STATIC(name)    static G_LOCK_DEFINE (name)
 200 #define G_LOCK_DEFINE(name)           \
 201   GMutex G_LOCK_NAME (name) = G_MUTEX_INIT
 202 #define G_LOCK_EXTERN(name)           extern GMutex G_LOCK_NAME (name)
 203
 204 #ifdef G_DEBUG_LOCKS
 205 #  define G_LOCK(name)                G_STMT_START{             \
 206       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 207              "file %s: line %d (%s): locking: %s ",             \
 208              __FILE__,        __LINE__, G_STRFUNC,              \
 209              #name);                                            \
 210       g_mutex_lock (&G_LOCK_NAME (name));                       \
 211    }G_STMT_END
 212 #  define G_UNLOCK(name)              G_STMT_START{             \
 213       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 214              "file %s: line %d (%s): unlocking: %s ",           \
 215              __FILE__,        __LINE__, G_STRFUNC,              \
 216              #name);                                            \
 217      g_mutex_unlock (&G_LOCK_NAME (name));                      \
 218    }G_STMT_END
 219 #  define G_TRYLOCK(name)                                       \
 220       (g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                  \
 221              "file %s: line %d (%s): try locking: %s ",         \
 222              __FILE__,        __LINE__, G_STRFUNC,              \
 223              #name), g_mutex_trylock (&G_LOCK_NAME (name)))
 224 #else  /* !G_DEBUG_LOCKS */
 225 #  define G_LOCK(name) g_mutex_lock       (&G_LOCK_NAME (name))
 226 #  define G_UNLOCK(name) g_mutex_unlock   (&G_LOCK_NAME (name))
 227 #  define G_TRYLOCK(name) g_mutex_trylock (&G_LOCK_NAME (name))
 228 #endif /* !G_DEBUG_LOCKS */
 229
 230
 231 GMutex *                g_mutex_new                                     (void);
 232 void                    g_mutex_free                                    (GMutex         *mutex);
 233 void                    g_mutex_init                                    (GMutex         *mutex);
 234 void                    g_mutex_clear                                   (GMutex         *mutex);
 235
 236 void                    g_mutex_lock                                    (GMutex         *mutex);
 237 void                    g_mutex_unlock                                  (GMutex         *mutex);
 238 gboolean                g_mutex_trylock                                 (GMutex         *mutex);
 239
 240 void                    g_rw_lock_init                                  (GRWLock        *rw_lock);
 241 void                    g_rw_lock_clear                                 (GRWLock        *rw_lock);
 242 void                    g_rw_lock_writer_lock                           (GRWLock        *rw_lock);
 243 gboolean                g_rw_lock_writer_trylock                        (GRWLock        *rw_lock);
 244 void                    g_rw_lock_writer_unlock                         (GRWLock        *rw_lock);
 245 void                    g_rw_lock_reader_lock                           (GRWLock        *rw_lock);
 246 gboolean                g_rw_lock_reader_trylock                        (GRWLock        *rw_lock);
 247 void                    g_rw_lock_reader_unlock                         (GRWLock        *rw_lock);
 248
 249 void                    g_rec_mutex_init                                (GRecMutex      *rec_mutex);
 250 void                    g_rec_mutex_clear                               (GRecMutex      *rec_mutex);
 251 void                    g_rec_mutex_lock                                (GRecMutex      *rec_mutex);
 252 gboolean                g_rec_mutex_trylock                             (GRecMutex      *rec_mutex);
 253 void                    g_rec_mutex_unlock                              (GRecMutex      *rec_mutex);
 254
 255 GCond *                 g_cond_new                                      (void);
 256 void                    g_cond_free                                     (GCond          *cond);
 257 void                    g_cond_init                                     (GCond          *cond);
 258 void                    g_cond_clear                                    (GCond          *cond);
 259
 260 void                    g_cond_wait                                     (GCond          *cond,
 261                                                                          GMutex         *mutex);
 262 void                    g_cond_signal                                   (GCond          *cond);
 263 void                    g_cond_broadcast                                (GCond          *cond);
 264 gboolean                g_cond_timed_wait                               (GCond          *cond,
 265                                                                          GMutex         *mutex,
 266                                                                          GTimeVal       *timeval);
 267 gboolean                g_cond_timedwait                                (GCond          *cond,
 268                                                                          GMutex         *mutex,
 269                                                                          gint64          abs_time);
 270
 271 gpointer                g_private_get                                   (GPrivate       *key);
 272 void                    g_private_set                                   (GPrivate       *key,
 273                                                                          gpointer        value);
 274 void                    g_private_replace                               (GPrivate       *key,
 275                                                                          gpointer        value);
 276
 277 G_END_DECLS
 278
 279 #endif /* __G_THREAD_H__ */