1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
|
/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif
#ifndef __G_THREAD_H__
#define __G_THREAD_H__
#include <glib/gerror.h>
#include <glib/gtypes.h>
#include <glib/gutils.h> /* for G_INLINE_FUNC */
#include <glib/gatomic.h> /* for g_atomic_pointer_get */
G_BEGIN_DECLS
/* GLib Thread support
*/
extern GQuark g_thread_error_quark (void);
#define G_THREAD_ERROR g_thread_error_quark ()
typedef enum
{
G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
} GThreadError;
typedef gpointer (*GThreadFunc) (gpointer data);
typedef enum
{
G_THREAD_PRIORITY_LOW,
G_THREAD_PRIORITY_NORMAL,
G_THREAD_PRIORITY_HIGH,
G_THREAD_PRIORITY_URGENT
} GThreadPriority;
typedef struct _GThread GThread;
struct _GThread
{
/*< private >*/
GThreadFunc func;
gpointer data;
gboolean joinable;
GThreadPriority priority;
};
typedef struct _GMutex GMutex;
typedef struct _GCond GCond;
typedef struct _GPrivate GPrivate;
typedef struct _GStaticPrivate GStaticPrivate;
typedef struct _GThreadFunctions GThreadFunctions;
struct _GThreadFunctions
{
GMutex* (*mutex_new) (void);
void (*mutex_lock) (GMutex *mutex);
gboolean (*mutex_trylock) (GMutex *mutex);
void (*mutex_unlock) (GMutex *mutex);
void (*mutex_free) (GMutex *mutex);
GCond* (*cond_new) (void);
void (*cond_signal) (GCond *cond);
void (*cond_broadcast) (GCond *cond);
void (*cond_wait) (GCond *cond,
GMutex *mutex);
gboolean (*cond_timed_wait) (GCond *cond,
GMutex *mutex,
GTimeVal *end_time);
void (*cond_free) (GCond *cond);
GPrivate* (*private_new) (GDestroyNotify destructor);
gpointer (*private_get) (GPrivate *private_key);
void (*private_set) (GPrivate *private_key,
gpointer data);
void (*thread_create) (GThreadFunc func,
gpointer data,
gulong stack_size,
gboolean joinable,
gboolean bound,
GThreadPriority priority,
gpointer thread,
GError **error);
void (*thread_yield) (void);
void (*thread_join) (gpointer thread);
void (*thread_exit) (void);
void (*thread_set_priority)(gpointer thread,
GThreadPriority priority);
void (*thread_self) (gpointer thread);
gboolean (*thread_equal) (gpointer thread1,
gpointer thread2);
};
GLIB_VAR GThreadFunctions g_thread_functions_for_glib_use;
GLIB_VAR gboolean g_thread_use_default_impl;
GLIB_VAR gboolean g_threads_got_initialized;
GLIB_VAR guint64 (*g_thread_gettime) (void);
/* initializes the mutex/cond/private implementation for glib, might
* only be called once, and must not be called directly or indirectly
* from another glib-function, e.g. as a callback.
*/
void g_thread_init (GThreadFunctions *vtable);
/* Errorcheck mutexes. If you define G_ERRORCHECK_MUTEXES, then all
* mutexes will check for re-locking and re-unlocking */
/* Initialize thread system with errorcheck mutexes. vtable must be
* NULL. Do not call directly. Use #define G_ERRORCHECK_MUTEXES
* instead.
*/
void g_thread_init_with_errorcheck_mutexes (GThreadFunctions* vtable);
/* Checks if thread support is initialized. Identical to the
* g_thread_supported macro but provided for language bindings.
*/
gboolean g_thread_get_initialized (void);
/* A random number to recognize debug calls to g_mutex_... */
#define G_MUTEX_DEBUG_MAGIC 0xf8e18ad7
#ifdef G_ERRORCHECK_MUTEXES
#define g_thread_init(vtable) g_thread_init_with_errorcheck_mutexes (vtable)
#endif
/* internal function for fallback static mutex implementation */
GMutex* g_static_mutex_get_mutex_impl (GMutex **mutex);
#define g_static_mutex_get_mutex_impl_shortcut(mutex) \
(g_atomic_pointer_get (mutex) ? *(mutex) : \
g_static_mutex_get_mutex_impl (mutex))
/* shorthands for conditional and unconditional function calls */
#define G_THREAD_UF(op, arglist) \
(*g_thread_functions_for_glib_use . op) arglist
#define G_THREAD_CF(op, fail, arg) \
(g_thread_supported () ? G_THREAD_UF (op, arg) : (fail))
#define G_THREAD_ECF(op, fail, mutex, type) \
(g_thread_supported () ? \
((type(*)(GMutex*, const gulong, gchar const*)) \
(*g_thread_functions_for_glib_use . op)) \
(mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (fail))
#ifndef G_ERRORCHECK_MUTEXES
# define g_mutex_lock(mutex) \
G_THREAD_CF (mutex_lock, (void)0, (mutex))
# define g_mutex_trylock(mutex) \
G_THREAD_CF (mutex_trylock, TRUE, (mutex))
# define g_mutex_unlock(mutex) \
G_THREAD_CF (mutex_unlock, (void)0, (mutex))
# define g_mutex_free(mutex) \
G_THREAD_CF (mutex_free, (void)0, (mutex))
# define g_cond_wait(cond, mutex) \
G_THREAD_CF (cond_wait, (void)0, (cond, mutex))
# define g_cond_timed_wait(cond, mutex, abs_time) \
G_THREAD_CF (cond_timed_wait, TRUE, (cond, mutex, abs_time))
#else /* G_ERRORCHECK_MUTEXES */
# define g_mutex_lock(mutex) \
G_THREAD_ECF (mutex_lock, (void)0, (mutex), void)
# define g_mutex_trylock(mutex) \
G_THREAD_ECF (mutex_trylock, TRUE, (mutex), gboolean)
# define g_mutex_unlock(mutex) \
G_THREAD_ECF (mutex_unlock, (void)0, (mutex), void)
# define g_mutex_free(mutex) \
G_THREAD_ECF (mutex_free, (void)0, (mutex), void)
# define g_cond_wait(cond, mutex) \
(g_thread_supported () ? ((void(*)(GCond*, GMutex*, gulong, gchar*))\
g_thread_functions_for_glib_use.cond_wait) \
(cond, mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (void) 0)
# define g_cond_timed_wait(cond, mutex, abs_time) \
(g_thread_supported () ? \
((gboolean(*)(GCond*, GMutex*, GTimeVal*, gulong, gchar*)) \
g_thread_functions_for_glib_use.cond_timed_wait) \
(cond, mutex, abs_time, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : TRUE)
#endif /* G_ERRORCHECK_MUTEXES */
#define g_thread_supported() (g_threads_got_initialized)
#define g_mutex_new() G_THREAD_UF (mutex_new, ())
#define g_cond_new() G_THREAD_UF (cond_new, ())
#define g_cond_signal(cond) G_THREAD_CF (cond_signal, (void)0, (cond))
#define g_cond_broadcast(cond) G_THREAD_CF (cond_broadcast, (void)0, (cond))
#define g_cond_free(cond) G_THREAD_CF (cond_free, (void)0, (cond))
#define g_private_new(destructor) G_THREAD_UF (private_new, (destructor))
#define g_private_get(private_key) G_THREAD_CF (private_get, \
((gpointer)private_key), \
(private_key))
#define g_private_set(private_key, value) G_THREAD_CF (private_set, \
(void) (private_key = \
(GPrivate*) (value)), \
(private_key, value))
#define g_thread_yield() G_THREAD_CF (thread_yield, (void)0, ())
#define g_thread_create(func, data, joinable, error) \
(g_thread_create_full (func, data, 0, joinable, FALSE, \
G_THREAD_PRIORITY_NORMAL, error))
GThread* g_thread_create_full (GThreadFunc func,
gpointer data,
gulong stack_size,
gboolean joinable,
gboolean bound,
GThreadPriority priority,
GError **error);
GThread* g_thread_self (void);
void g_thread_exit (gpointer retval);
gpointer g_thread_join (GThread *thread);
void g_thread_set_priority (GThread *thread,
GThreadPriority priority);
/* GStaticMutexes can be statically initialized with the value
* G_STATIC_MUTEX_INIT, and then they can directly be used, that is
* much easier, than having to explicitly allocate the mutex before
* use
*/
#define g_static_mutex_lock(mutex) \
g_mutex_lock (g_static_mutex_get_mutex (mutex))
#define g_static_mutex_trylock(mutex) \
g_mutex_trylock (g_static_mutex_get_mutex (mutex))
#define g_static_mutex_unlock(mutex) \
g_mutex_unlock (g_static_mutex_get_mutex (mutex))
void g_static_mutex_init (GStaticMutex *mutex);
void g_static_mutex_free (GStaticMutex *mutex);
struct _GStaticPrivate
{
/*< private >*/
guint index;
};
#define G_STATIC_PRIVATE_INIT { 0 }
void g_static_private_init (GStaticPrivate *private_key);
gpointer g_static_private_get (GStaticPrivate *private_key);
void g_static_private_set (GStaticPrivate *private_key,
gpointer data,
GDestroyNotify notify);
void g_static_private_free (GStaticPrivate *private_key);
typedef struct _GStaticRecMutex GStaticRecMutex;
struct _GStaticRecMutex
{
/*< private >*/
GStaticMutex mutex;
guint depth;
GSystemThread owner;
};
#define G_STATIC_REC_MUTEX_INIT { G_STATIC_MUTEX_INIT }
void g_static_rec_mutex_init (GStaticRecMutex *mutex);
void g_static_rec_mutex_lock (GStaticRecMutex *mutex);
gboolean g_static_rec_mutex_trylock (GStaticRecMutex *mutex);
void g_static_rec_mutex_unlock (GStaticRecMutex *mutex);
void g_static_rec_mutex_lock_full (GStaticRecMutex *mutex,
guint depth);
guint g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex);
void g_static_rec_mutex_free (GStaticRecMutex *mutex);
typedef struct _GStaticRWLock GStaticRWLock;
struct _GStaticRWLock
{
/*< private >*/
GStaticMutex mutex;
GCond *read_cond;
GCond *write_cond;
guint read_counter;
gboolean have_writer;
guint want_to_read;
guint want_to_write;
};
#define G_STATIC_RW_LOCK_INIT { G_STATIC_MUTEX_INIT, NULL, NULL, 0, FALSE, 0, 0 }
void g_static_rw_lock_init (GStaticRWLock* lock);
void g_static_rw_lock_reader_lock (GStaticRWLock* lock);
gboolean g_static_rw_lock_reader_trylock (GStaticRWLock* lock);
void g_static_rw_lock_reader_unlock (GStaticRWLock* lock);
void g_static_rw_lock_writer_lock (GStaticRWLock* lock);
gboolean g_static_rw_lock_writer_trylock (GStaticRWLock* lock);
void g_static_rw_lock_writer_unlock (GStaticRWLock* lock);
void g_static_rw_lock_free (GStaticRWLock* lock);
void g_thread_foreach (GFunc thread_func,
gpointer user_data);
typedef enum
{
G_ONCE_STATUS_NOTCALLED,
G_ONCE_STATUS_PROGRESS,
G_ONCE_STATUS_READY
} GOnceStatus;
typedef struct _GOnce GOnce;
struct _GOnce
{
volatile GOnceStatus status;
volatile gpointer retval;
};
#define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
gpointer g_once_impl (GOnce *once, GThreadFunc func, gpointer arg);
#ifdef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
# define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
#else /* !G_ATOMIC_OP_MEMORY_BARRIER_NEEDED*/
# define g_once(once, func, arg) \
(((once)->status == G_ONCE_STATUS_READY) ? \
(once)->retval : \
g_once_impl ((once), (func), (arg)))
#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
/* initialize-once guards, keyed by value_location */
G_INLINE_FUNC gboolean g_once_init_enter (volatile gsize *value_location);
gboolean g_once_init_enter_impl (volatile gsize *value_location);
void g_once_init_leave (volatile gsize *value_location,
gsize initialization_value);
#if defined (G_CAN_INLINE) || defined (__G_THREAD_C__)
G_INLINE_FUNC gboolean
g_once_init_enter (volatile gsize *value_location)
{
if G_LIKELY ((gpointer) g_atomic_pointer_get (value_location) != NULL)
return FALSE;
else
return g_once_init_enter_impl (value_location);
}
#endif /* G_CAN_INLINE || __G_THREAD_C__ */
/* these are some convenience macros that expand to nothing if GLib
* was configured with --disable-threads. for using StaticMutexes,
* you define them with G_LOCK_DEFINE_STATIC (name) or G_LOCK_DEFINE (name)
* if you need to export the mutex. With G_LOCK_EXTERN (name) you can
* declare such an globally defined lock. name is a unique identifier
* for the protected varibale or code portion. locking, testing and
* unlocking of such mutexes can be done with G_LOCK(), G_UNLOCK() and
* G_TRYLOCK() respectively.
*/
extern void glib_dummy_decl (void);
#define G_LOCK_NAME(name) g__ ## name ## _lock
#ifdef G_THREADS_ENABLED
# define G_LOCK_DEFINE_STATIC(name) static G_LOCK_DEFINE (name)
# define G_LOCK_DEFINE(name) \
GStaticMutex G_LOCK_NAME (name) = G_STATIC_MUTEX_INIT
# define G_LOCK_EXTERN(name) extern GStaticMutex G_LOCK_NAME (name)
# ifdef G_DEBUG_LOCKS
# define G_LOCK(name) G_STMT_START{ \
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
"file %s: line %d (%s): locking: %s ", \
__FILE__, __LINE__, G_STRFUNC, \
#name); \
g_static_mutex_lock (&G_LOCK_NAME (name)); \
}G_STMT_END
# define G_UNLOCK(name) G_STMT_START{ \
g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
"file %s: line %d (%s): unlocking: %s ", \
__FILE__, __LINE__, G_STRFUNC, \
#name); \
g_static_mutex_unlock (&G_LOCK_NAME (name)); \
}G_STMT_END
# define G_TRYLOCK(name) \
(g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
"file %s: line %d (%s): try locking: %s ", \
__FILE__, __LINE__, G_STRFUNC, \
#name), g_static_mutex_trylock (&G_LOCK_NAME (name)))
# else /* !G_DEBUG_LOCKS */
# define G_LOCK(name) g_static_mutex_lock (&G_LOCK_NAME (name))
# define G_UNLOCK(name) g_static_mutex_unlock (&G_LOCK_NAME (name))
# define G_TRYLOCK(name) g_static_mutex_trylock (&G_LOCK_NAME (name))
# endif /* !G_DEBUG_LOCKS */
#else /* !G_THREADS_ENABLED */
# define G_LOCK_DEFINE_STATIC(name) extern void glib_dummy_decl (void)
# define G_LOCK_DEFINE(name) extern void glib_dummy_decl (void)
# define G_LOCK_EXTERN(name) extern void glib_dummy_decl (void)
# define G_LOCK(name)
# define G_UNLOCK(name)
# define G_TRYLOCK(name) (TRUE)
#endif /* !G_THREADS_ENABLED */
G_END_DECLS
#endif /* __G_THREAD_H__ */
|
