summaryrefslogtreecommitdiff
path: root/gcc/gthr-dce.h
blob: 957f227292470db52602684861150b1fdba779e1 (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

/* Compile this one with gcc.  */
/* Copyright (C) 1997, 1999, 2000, 2001 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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.

GCC 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 GCC; 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 GCC_GTHR_DCE_H
#define GCC_GTHR_DCE_H

/* If _DCE_THREADS is not defined, then we're building the single
   threaded version of the libraries and do not want to reference
   anything related to pthreads or dce.  */
#ifndef _DCE_THREADS
#include "gthr-single.h"
#else
/* DCE threads interface.
   DCE threads are based on POSIX threads draft 4, and many things
   have changed since then.  */

#define __GTHREADS 1

#include <pthread.h>

#ifdef __cplusplus
#define UNUSED(x) x
#else
#define UNUSED(x) x __attribute__((unused))
#endif

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

#define __GTHREAD_ONCE_INIT pthread_once_init

#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function

#define __GTHREAD_MUTEX_INIT_DEFAULT pthread_once_init

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK

#pragma weak pthread_once
#pragma weak pthread_once_init
#pragma weak pthread_keycreate
#pragma weak pthread_key_delete
#pragma weak pthread_getspecific
#pragma weak pthread_setspecific
#pragma weak pthread_create
#pragma weak pthread_mutex_init
#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_getunique_np
#pragma weak pthread_mutex_destroy
#pragma weak pthread_self
#pragma weak pthread_yield
#endif

static inline int
__gthread_active_p (void)
{
  static void *const __gthread_active_ptr = (void *) &pthread_create;
  return __gthread_active_ptr != 0;
}

#else /* not SUPPORTS_WEAK */

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

#endif /* SUPPORTS_WEAK */

#ifdef _LIBOBJC

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

/* 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 */
    return pthread_keycreate (&_objc_thread_storage, NULL);
  else
    return -1;
}

/* Close the threads subsystem.  */
static inline int
__gthread_objc_close_thread_system(void)
{
  if (__gthread_active_p ())
    return 0;
  else
    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, pthread_attr_default,
  			(void *)func, arg)) )
    {
      /* ??? May not work! (64bit) */
      thread_id = *(objc_thread_t *)&new_thread_handle;
      pthread_detach(&new_thread_handle); /* Fully detach thread.  */
    }
  else
    thread_id = NULL;
  
  return thread_id;
}

/* Set the current thread's priority.  */
static inline int
__gthread_objc_thread_set_priority(int priority)
{
  int sys_priority = 0;

  if (!__gthread_active_p ())
    return -1;

  switch (priority)
    {
    case OBJC_THREAD_INTERACTIVE_PRIORITY:
      sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
      break;
    default:
    case OBJC_THREAD_BACKGROUND_PRIORITY:
      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
      break;
    case OBJC_THREAD_LOW_PRIORITY:
      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
      break;
    }
    
  /* Change the priority.  */
  if (pthread_setprio(pthread_self(), sys_priority) >= 0)
    return 0;
  else
    /* Failed */
    return -1;
}

/* Return the current thread's priority.  */
static inline int
__gthread_objc_thread_get_priority(void)
{
  int sys_priority;

  if (__gthread_active_p ())
    {
      if ((sys_priority = pthread_getprio(pthread_self())) >= 0)
        {
	  if (sys_priority >= PRI_FG_MIN_NP
	      && sys_priority <= PRI_FG_MAX_NP)
	    return OBJC_THREAD_INTERACTIVE_PRIORITY;
	  if (sys_priority >= PRI_BG_MIN_NP
	      && sys_priority <= PRI_BG_MAX_NP)
	    return OBJC_THREAD_BACKGROUND_PRIORITY;
	  return OBJC_THREAD_LOW_PRIORITY;
	}

      /* Failed */
      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 ())
    pthread_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) pthread_getunique_np (&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)
{
  void *value = NULL;

  if (__gthread_active_p ())
    {
      if ( !(pthread_getspecific(_objc_thread_storage, &value)) )
	return value;

      return NULL;
    }
  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,
      			    pthread_mutexattr_default))
        {
          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 ())
    {
      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 ()
      && pthread_mutex_trylock((pthread_mutex_t *)mutex->backend) != 1)
    return -1;

  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 ())
    /* Unimplemented.  */
    return -1;
  else
    return 0;
}

/* Deallocate a condition.  */
static inline int
__gthread_objc_condition_deallocate(objc_condition_t condition)
{
  if (__gthread_active_p ())
    /* Unimplemented.  */
    return -1;
  else
    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 ())
    /* Unimplemented.  */
    return -1;
  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 ())
    /* Unimplemented.  */
    return -1;
  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 ())
    /* Unimplemented.  */
    return -1;
  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_keycreate (key, dtor);
}

static inline int
__gthread_key_dtor (UNUSED (__gthread_key_t key), UNUSED (void *ptr))
{
  /* Nothing needed.  */
  return 0;
}

static inline int
__gthread_key_delete (UNUSED (__gthread_key_t key))
{
  /* Operation is not supported.  */
  return -1;
}

static inline void *
__gthread_getspecific (__gthread_key_t key)
{
  void *ptr;
  if (pthread_getspecific (key, &ptr) == 0)
    return ptr;
  else
    return 0;
}

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

static inline void
__gthread_mutex_init_function (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    pthread_mutex_init (mutex, pthread_mutexattr_default);
}

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 */

#undef UNUSED

#endif
#endif /* ! GCC_GTHR_DCE_H */