aboutsummaryrefslogtreecommitdiff
path: root/gcc/gthr-posix.h
blob: 7b92316055afb4c5ef83d2d35b6bbac578aca074 (plain)
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
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
/* Threads compatibility routines for libgcc2 and libobjc.  */
/* Compile this one with gcc.  */
/* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

#ifndef __gthr_posix_h
#define __gthr_posix_h

/* POSIX threads specific definitions.
   Easy, since the interface is just one-to-one mapping. */

#define __GTHREADS 1

#include <pthread.h>

typedef pthread_key_t __gthread_key_t;
typedef pthread_once_t __gthread_once_t;
typedef pthread_mutex_t __gthread_mutex_t;

#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK

#pragma weak pthread_once
#pragma weak pthread_key_create
#pragma weak pthread_key_delete
#pragma weak pthread_getspecific
#pragma weak pthread_setspecific
#pragma weak pthread_create

#pragma weak pthread_mutex_lock 
#pragma weak pthread_mutex_trylock 
#pragma weak pthread_mutex_unlock 

#ifdef _LIBOBJC
/* Objective C. */
#pragma weak pthread_cond_broadcast
#pragma weak pthread_cond_destroy
#pragma weak pthread_cond_init
#pragma weak pthread_cond_signal
#pragma weak pthread_cond_wait
#pragma weak pthread_exit
#pragma weak pthread_mutex_init
#pragma weak pthread_mutex_destroy
#pragma weak pthread_self
#pragma weak sched_yield
#endif

static void *__gthread_active_ptr = &pthread_create;

static inline int
__gthread_active_p (void)
{
  return __gthread_active_ptr != 0;
}

#else /* not SUPPORTS_WEAK */

static inline int
__gthread_active_p (void)
{
  return 1;
}

#endif /* SUPPORTS_WEAK */

#ifdef _LIBOBJC

/* This is the config.h file in libobjc/ */
#include <config.h>

#ifdef HAVE_SCHED_H
# include <sched.h>
#endif

/* Key structure for maintaining thread specific storage */
static pthread_key_t _objc_thread_storage;
static pthread_attr_t _objc_thread_attribs;

/* Thread local storage for a single thread */
static void *thread_local_storage = NULL;

/* Backend initialization functions */

/* Initialize the threads subsystem. */
static inline int
__gthread_objc_init_thread_system(void)
{
  if (__gthread_active_p ())
    {
      /* Initialize the thread storage key */
      if (pthread_key_create(&_objc_thread_storage, NULL) == 0)
        {
          /* The normal default detach state for threads is
           * PTHREAD_CREATE_JOINABLE which causes threads to not die
           * when you think they should.  */
          if (pthread_attr_init(&_objc_thread_attribs) == 0
              && pthread_attr_setdetachstate(&_objc_thread_attribs, 
                                             PTHREAD_CREATE_DETACHED) == 0)
            return 0;
        }
    }
  else
    return -1;
}

/* Close the threads subsystem. */
static inline int
__gthread_objc_close_thread_system(void)
{
  if (__gthread_active_p ()
      && pthread_key_delete(_objc_thread_storage) == 0
      && pthread_attr_destroy(&_objc_thread_attribs) == 0)
    return 0;

  return -1;
}

/* Backend thread functions */

/* Create a new thread of execution. */
static inline objc_thread_t
__gthread_objc_thread_detach(void (*func)(void *), void *arg)
{
  objc_thread_t thread_id;
  pthread_t new_thread_handle;

  if (!__gthread_active_p ())
    return NULL;
 
  if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) )
    thread_id = *(objc_thread_t *)&new_thread_handle;
  else
    thread_id = NULL;
  
  return thread_id;
}

/* Set the current thread's priority. */
static inline int
__gthread_objc_thread_set_priority(int priority)
{
  if (!__gthread_active_p())
    return -1;
  else {
    pthread_t thread_id = pthread_self();
    int policy;
    struct sched_param params;
    int priority_min, priority_max;

    if (pthread_getschedparam(thread_id, &policy, &params) == 0)
      {
        if ((priority_max = sched_get_priority_max(policy)) != 0)
          return -1;

        if ((priority_min = sched_get_priority_min(policy)) != 0)
          return -1;

        if (priority > priority_max)
          priority = priority_max;
        else if (priority < priority_min)
          priority = priority_min;
        params.sched_priority = priority;

        /*
         * The solaris 7 and several other man pages incorrectly state that
         * this should be a pointer to policy but pthread.h is universally
         * at odds with this.
         */
        if (pthread_setschedparam(thread_id, policy, &params) == 0)
          return 0;
      }
    return -1;
  }
}

/* Return the current thread's priority. */
static inline int
__gthread_objc_thread_get_priority(void)
{
  if (__gthread_active_p ())
    {
      int policy;
      struct sched_param params;

      if (pthread_getschedparam(pthread_self(), &policy, &params) == 0)
        return params.sched_priority;
      else
        return -1;
    }
  else
    return OBJC_THREAD_INTERACTIVE_PRIORITY;
}

/* Yield our process time to another thread. */
static inline void
__gthread_objc_thread_yield(void)
{
  if (__gthread_active_p ())
    sched_yield();
}

/* Terminate the current thread. */
static inline int
__gthread_objc_thread_exit(void)
{
  if (__gthread_active_p ())
    /* exit the thread */
    pthread_exit(&__objc_thread_exit_status);

  /* Failed if we reached here */
  return -1;
}

/* Returns an integer value which uniquely describes a thread. */
static inline objc_thread_t
__gthread_objc_thread_id(void)
{
  if (__gthread_active_p ())
    {
      pthread_t self = pthread_self();

      return *(objc_thread_t *)&self;
    }
  else
    return (objc_thread_t)1;
}

/* Sets the thread's local storage pointer. */
static inline int
__gthread_objc_thread_set_data(void *value)
{
  if (__gthread_active_p ())
    return pthread_setspecific(_objc_thread_storage, value);
  else
    {
      thread_local_storage = value;
      return 0;
    }
}

/* Returns the thread's local storage pointer. */
static inline void *
__gthread_objc_thread_get_data(void)
{
  if (__gthread_active_p ())
    return pthread_getspecific(_objc_thread_storage);
  else
    return thread_local_storage;
}

/* Backend mutex functions */

/* Allocate a mutex. */
static inline int
__gthread_objc_mutex_allocate(objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    {
      mutex->backend = objc_malloc(sizeof(pthread_mutex_t));

      if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL))
	{
	  objc_free(mutex->backend);
	  mutex->backend = NULL;
	  return -1;
	}
    }

  return 0;
}

/* Deallocate a mutex. */
static inline int
__gthread_objc_mutex_deallocate(objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    {
      int count;

      /*
       * Posix Threads specifically require that the thread be unlocked
       * for pthread_mutex_destroy to work.
       */

      do
	{
	  count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend);
	  if (count < 0)
	    return -1;
	}
      while (count);

      if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend))
	return -1;

      objc_free(mutex->backend);
      mutex->backend = NULL;
    }
  return 0;
}

/* Grab a lock on a mutex. */
static inline int
__gthread_objc_mutex_lock(objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_lock((pthread_mutex_t *)mutex->backend);
  else
    return 0;
}

/* Try to grab a lock on a mutex. */
static inline int
__gthread_objc_mutex_trylock(objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_trylock((pthread_mutex_t *)mutex->backend);
  else
    return 0;
}

/* Unlock the mutex */
static inline int
__gthread_objc_mutex_unlock(objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_unlock((pthread_mutex_t *)mutex->backend);
  else
    return 0;
}

/* Backend condition mutex functions */

/* Allocate a condition. */
static inline int
__gthread_objc_condition_allocate(objc_condition_t condition)
{
  if (__gthread_active_p ())
    {
      condition->backend = objc_malloc(sizeof(pthread_cond_t));

      if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL))
	{
	  objc_free(condition->backend);
	  condition->backend = NULL;
	  return -1;
	}
    }

  return 0;
}

/* Deallocate a condition. */
static inline int
__gthread_objc_condition_deallocate(objc_condition_t condition)
{
  if (__gthread_active_p ())
    {
      if (pthread_cond_destroy((pthread_cond_t *)condition->backend))
	return -1;

      objc_free(condition->backend);
      condition->backend = NULL;
    }
  return 0;
}

/* Wait on the condition */
static inline int
__gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    return pthread_cond_wait((pthread_cond_t *)condition->backend,
			   (pthread_mutex_t *)mutex->backend);
  else
    return 0;
}

/* Wake up all threads waiting on this condition. */
static inline int
__gthread_objc_condition_broadcast(objc_condition_t condition)
{
  if (__gthread_active_p ())
    return pthread_cond_broadcast((pthread_cond_t *)condition->backend);
  else
    return 0;
}

/* Wake up one thread waiting on this condition. */
static inline int
__gthread_objc_condition_signal(objc_condition_t condition)
{
  if (__gthread_active_p ())
    return pthread_cond_signal((pthread_cond_t *)condition->backend);
  else
    return 0;
}

#else /* _LIBOBJC */

static inline int
__gthread_once (__gthread_once_t *once, void (*func) (void))
{
  if (__gthread_active_p ())
    return pthread_once (once, func);
  else
    return -1;
}

static inline int
__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
{
  return pthread_key_create (key, dtor);
}

static inline int
__gthread_key_dtor (__gthread_key_t key, void *ptr)
{
  /* Just reset the key value to zero. */
  if (ptr)
    return pthread_setspecific (key, 0);
  else
    return 0;
}

static inline int
__gthread_key_delete (__gthread_key_t key)
{
  return pthread_key_delete (key);
}

static inline void *
__gthread_getspecific (__gthread_key_t key)
{
  return pthread_getspecific (key);
}

static inline int
__gthread_setspecific (__gthread_key_t key, const void *ptr)
{
  return pthread_setspecific (key, ptr);
}

static inline int
__gthread_mutex_lock (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_lock (mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_trylock (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_trylock (mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_unlock (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_unlock (mutex);
  else
    return 0;
}

#endif /* _LIBOBJC */

#endif /* not __gthr_posix_h */