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, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * 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 (__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/gatomic.h>
  35 #include <glib/gerror.h>
  36
  37 G_BEGIN_DECLS
  38
  39 #define G_THREAD_ERROR g_thread_error_quark ()
  40 GQuark g_thread_error_quark (void);
  41
  42 typedef enum
  43 {
  44   G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
  45 } GThreadError;
  46
  47 typedef gpointer (*GThreadFunc) (gpointer data);
  48
  49 typedef struct _GThread         GThread;
  50
  51 typedef union  _GMutex          GMutex;
  52 typedef struct _GRecMutex       GRecMutex;
  53 typedef struct _GRWLock         GRWLock;
  54 typedef struct _GCond           GCond;
  55 typedef struct _GPrivate        GPrivate;
  56 typedef struct _GOnce           GOnce;
  57
  58 union _GMutex
  59 {
  60   /*< private >*/
  61   gpointer p;
  62   guint i[2];
  63 };
  64
  65 struct _GRWLock
  66 {
  67   /*< private >*/
  68   gpointer p;
  69   guint i[2];
  70 };
  71
  72 struct _GCond
  73 {
  74   /*< private >*/
  75   gpointer p;
  76   guint i[2];
  77 };
  78
  79 struct _GRecMutex
  80 {
  81   /*< private >*/
  82   gpointer p;
  83   guint i[2];
  84 };
  85
  86 #define G_PRIVATE_INIT(notify) { NULL, (notify), { NULL, NULL } }
  87 struct _GPrivate
  88 {
  89   /*< private >*/
  90   gpointer       p;
  91   GDestroyNotify notify;
  92   gpointer future[2];
  93 };
  94
  95 typedef enum
  96 {
  97   G_ONCE_STATUS_NOTCALLED,
  98   G_ONCE_STATUS_PROGRESS,
  99   G_ONCE_STATUS_READY
 100 } GOnceStatus;
 101
 102 #define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
 103 struct _GOnce
 104 {
 105   volatile GOnceStatus status;
 106   volatile gpointer retval;
 107 };
 108
 109 #define G_LOCK_NAME(name)             g__ ## name ## _lock
 110 #define G_LOCK_DEFINE_STATIC(name)    static G_LOCK_DEFINE (name)
 111 #define G_LOCK_DEFINE(name)           GMutex G_LOCK_NAME (name)
 112 #define G_LOCK_EXTERN(name)           extern GMutex G_LOCK_NAME (name)
 113
 114 #ifdef G_DEBUG_LOCKS
 115 #  define G_LOCK(name)                G_STMT_START{             \
 116       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 117              "file %s: line %d (%s): locking: %s ",             \
 118              __FILE__,        __LINE__, G_STRFUNC,              \
 119              #name);                                            \
 120       g_mutex_lock (&G_LOCK_NAME (name));                       \
 121    }G_STMT_END
 122 #  define G_UNLOCK(name)              G_STMT_START{             \
 123       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 124              "file %s: line %d (%s): unlocking: %s ",           \
 125              __FILE__,        __LINE__, G_STRFUNC,              \
 126              #name);                                            \
 127      g_mutex_unlock (&G_LOCK_NAME (name));                      \
 128    }G_STMT_END
 129 #  define G_TRYLOCK(name)                                       \
 130       (g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                  \
 131              "file %s: line %d (%s): try locking: %s ",         \
 132              __FILE__,        __LINE__, G_STRFUNC,              \
 133              #name), g_mutex_trylock (&G_LOCK_NAME (name)))
 134 #else  /* !G_DEBUG_LOCKS */
 135 #  define G_LOCK(name) g_mutex_lock       (&G_LOCK_NAME (name))
 136 #  define G_UNLOCK(name) g_mutex_unlock   (&G_LOCK_NAME (name))
 137 #  define G_TRYLOCK(name) g_mutex_trylock (&G_LOCK_NAME (name))
 138 #endif /* !G_DEBUG_LOCKS */
 139
 140 GThread *       g_thread_ref                    (GThread        *thread);
 141 void            g_thread_unref                  (GThread        *thread);
 142 GThread *       g_thread_new                    (const gchar    *name,
 143                                                  GThreadFunc     func,
 144                                                  gpointer        data);
 145 GThread *       g_thread_try_new                (const gchar    *name,
 146                                                  GThreadFunc     func,
 147                                                  gpointer        data,
 148                                                  GError        **error);
 149 GThread *       g_thread_self                   (void);
 150 void            g_thread_exit                   (gpointer        retval);
 151 gpointer        g_thread_join                   (GThread        *thread);
 152 void            g_thread_yield                  (void);
 153
 154
 155 void            g_mutex_init                    (GMutex         *mutex);
 156 void            g_mutex_clear                   (GMutex         *mutex);
 157 void            g_mutex_lock                    (GMutex         *mutex);
 158 gboolean        g_mutex_trylock                 (GMutex         *mutex);
 159 void            g_mutex_unlock                  (GMutex         *mutex);
 160
 161 void            g_rw_lock_init                  (GRWLock        *rw_lock);
 162 void            g_rw_lock_clear                 (GRWLock        *rw_lock);
 163 void            g_rw_lock_writer_lock           (GRWLock        *rw_lock);
 164 gboolean        g_rw_lock_writer_trylock        (GRWLock        *rw_lock);
 165 void            g_rw_lock_writer_unlock         (GRWLock        *rw_lock);
 166 void            g_rw_lock_reader_lock           (GRWLock        *rw_lock);
 167 gboolean        g_rw_lock_reader_trylock        (GRWLock        *rw_lock);
 168 void            g_rw_lock_reader_unlock         (GRWLock        *rw_lock);
 169
 170 void            g_rec_mutex_init                (GRecMutex      *rec_mutex);
 171 void            g_rec_mutex_clear               (GRecMutex      *rec_mutex);
 172 void            g_rec_mutex_lock                (GRecMutex      *rec_mutex);
 173 gboolean        g_rec_mutex_trylock             (GRecMutex      *rec_mutex);
 174 void            g_rec_mutex_unlock              (GRecMutex      *rec_mutex);
 175
 176 void            g_cond_init                     (GCond          *cond);
 177 void            g_cond_clear                    (GCond          *cond);
 178 void            g_cond_wait                     (GCond          *cond,
 179                                                  GMutex         *mutex);
 180 void            g_cond_signal                   (GCond          *cond);
 181 void            g_cond_broadcast                (GCond          *cond);
 182 gboolean        g_cond_wait_until               (GCond          *cond,
 183                                                  GMutex         *mutex,
 184                                                  gint64          end_time);
 185
 186 gpointer        g_private_get                   (GPrivate       *key);
 187 void            g_private_set                   (GPrivate       *key,
 188                                                  gpointer        value);
 189 void            g_private_replace               (GPrivate       *key,
 190                                                  gpointer        value);
 191
 192 gpointer        g_once_impl                     (GOnce          *once,
 193                                                  GThreadFunc     func,
 194                                                  gpointer        arg);
 195 gboolean        g_once_init_enter               (volatile void  *location);
 196 void            g_once_init_leave               (volatile void  *location,
 197                                                  gsize           result);
 198
 199 #ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
 200 # define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
 201 #else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
 202 # define g_once(once, func, arg) \
 203   (((once)->status == G_ONCE_STATUS_READY) ? \
 204    (once)->retval : \
 205    g_once_impl ((once), (func), (arg)))
 206 #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
 207
 208 #ifdef __GNUC__
 209 # define g_once_init_enter(location) \
 210   (G_GNUC_EXTENSION ({                                               \
 211     G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer));       \
 212     (void) (0 ? (gpointer) *(location) : 0);                         \
 213     (!g_atomic_pointer_get (location) &&                             \
 214      g_once_init_enter (location));                                  \
 215   }))
 216 # define g_once_init_leave(location, result) \
 217   (G_GNUC_EXTENSION ({                                               \
 218     G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer));       \
 219     (void) (0 ? *(location) = (result) : 0);                         \
 220     g_once_init_leave ((location), (gsize) (result));                \
 221   }))
 222 #else
 223 # define g_once_init_enter(location) \
 224   (g_once_init_enter((location)))
 225 # define g_once_init_leave(location, result) \
 226   (g_once_init_leave((location), (gsize) (result)))
 227 #endif
 228
 229 G_END_DECLS
 230
 231 #endif /* __G_THREAD_H__ */