gcc/gthr-dce.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000, 2001, 2004, 2005
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA.  */
  22
  23 /* As a special exception, if you link this library with other files,
  24    some of which are compiled with GCC, to produce an executable,
  25    this library does not by itself cause the resulting executable
  26    to be covered by the GNU General Public License.
  27    This exception does not however invalidate any other reasons why
  28    the executable file might be covered by the GNU General Public License.  */
  29
  30 #ifndef GCC_GTHR_DCE_H
  31 #define GCC_GTHR_DCE_H
  32
  33 /* If _DCE_THREADS is not defined, then we're building the single
  34    threaded version of the libraries and do not want to reference
  35    anything related to pthreads or dce.  */
  36 #ifndef _DCE_THREADS
  37 #include "gthr-single.h"
  38 #else
  39 /* DCE threads interface.
  40    DCE threads are based on POSIX threads draft 4, and many things
  41    have changed since then.  */
  42
  43 #define __GTHREADS 1
  44
  45 #include <pthread.h>
  46
  47 #ifdef __cplusplus
  48 #define UNUSED(x) x
  49 #else
  50 #define UNUSED(x) x __attribute__((unused))
  51 #endif
  52
  53 typedef pthread_key_t __gthread_key_t;
  54 typedef pthread_once_t __gthread_once_t;
  55 typedef pthread_mutex_t __gthread_mutex_t;
  56 typedef pthread_mutex_t __gthread_recursive_mutex_t;
  57
  58 #define __GTHREAD_ONCE_INIT __gthrw_pthread_once_init
  59
  60 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
  61 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  62
  63 #define __GTHREAD_MUTEX_INIT_DEFAULT __gthrw_pthread_once_init
  64
  65 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  66 # define __gthrw(name) \
  67   extern __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)))
  68 #else
  69 # define __gthrw_asmname(cname) __gthrw_asmnamep (__USER_LABEL_PREFIX__, cname)
  70 # define __gthrw_asmnamep(prefix, cname) __gthrw_string (prefix) cname
  71 # define __gthrw_string(x) #x
  72 # define __gthrw(name) \
  73   extern __typeof(name) __gthrw_ ## name __asm (__gthrw_asmname (#name))
  74 #endif
  75
  76 __gthrw(pthread_once);
  77 __gthrw(pthread_once_init);
  78 __gthrw(pthread_keycreate);
  79 __gthrw(pthread_key_delete);
  80 __gthrw(pthread_getspecific);
  81 __gthrw(pthread_setspecific);
  82 __gthrw(pthread_create);
  83 __gthrw(pthread_mutex_init);
  84 __gthrw(pthread_mutex_lock);
  85 __gthrw(pthread_mutex_trylock);
  86 __gthrw(pthread_mutex_unlock);
  87 __gthrw(pthread_mutexattr_create);
  88 __gthrw(pthread_mutexattr_setkind_np);
  89 __gthrw(pthread_mutexattr_delete);
  90
  91 #ifdef _LIBOBJC
  92 /* Objective-C.  */
  93 __gthrw(pthread_cond_broadcast);
  94 __gthrw(pthread_cond_destroy);
  95 __gthrw(pthread_cond_init);
  96 __gthrw(pthread_cond_signal);
  97 __gthrw(pthread_cond_wait);
  98 __gthrw(pthread_exit);
  99 __gthrw(pthread_getunique_np);
 100 __gthrw(pthread_mutex_destroy);
 101 __gthrw(pthread_self);
 102 __gthrw(pthread_yield);
 103 #endif
 104
 105 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
 106
 107 static inline int
 108 __gthread_active_p (void)
 109 {
 110   static void *const __gthread_active_ptr = (void *) &__gthrw_pthread_create;
 111   return __gthread_active_ptr != 0;
 112 }
 113
 114 #else /* not SUPPORTS_WEAK */
 115
 116 static inline int
 117 __gthread_active_p (void)
 118 {
 119   return 1;
 120 }
 121
 122 #endif /* SUPPORTS_WEAK */
 123
 124 #ifdef _LIBOBJC
 125
 126 /* Key structure for maintaining thread specific storage */
 127 static pthread_key_t _objc_thread_storage;
 128
 129 /* Thread local storage for a single thread */
 130 static void *thread_local_storage = NULL;
 131
 132 /* Backend initialization functions */
 133
 134 /* Initialize the threads subsystem.  */
 135 static inline int
 136 __gthread_objc_init_thread_system (void)
 137 {
 138   if (__gthread_active_p ())
 139     /* Initialize the thread storage key.  */
 140     return __gthrw_pthread_keycreate (&_objc_thread_storage, NULL);
 141   else
 142     return -1;
 143 }
 144
 145 /* Close the threads subsystem.  */
 146 static inline int
 147 __gthread_objc_close_thread_system (void)
 148 {
 149   if (__gthread_active_p ())
 150     return 0;
 151   else
 152     return -1;
 153 }
 154
 155 /* Backend thread functions */
 156
 157 /* Create a new thread of execution.  */
 158 static inline objc_thread_t
 159 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
 160 {
 161   objc_thread_t thread_id;
 162   pthread_t new_thread_handle;
 163
 164   if (!__gthread_active_p ())
 165     return NULL;
 166
 167   if (!(__gthrw_pthread_create (&new_thread_handle, pthread_attr_default,
 168                         (void *) func, arg)))
 169     {
 170       /* ??? May not work! (64bit) */
 171       thread_id = *(objc_thread_t *) &new_thread_handle;
 172       pthread_detach (&new_thread_handle); /* Fully detach thread.  */
 173     }
 174   else
 175     thread_id = NULL;
 176
 177   return thread_id;
 178 }
 179
 180 /* Set the current thread's priority.  */
 181 static inline int
 182 __gthread_objc_thread_set_priority (int priority)
 183 {
 184   int sys_priority = 0;
 185
 186   if (!__gthread_active_p ())
 187     return -1;
 188
 189   switch (priority)
 190     {
 191     case OBJC_THREAD_INTERACTIVE_PRIORITY:
 192       sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
 193       break;
 194     default:
 195     case OBJC_THREAD_BACKGROUND_PRIORITY:
 196       sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
 197       break;
 198     case OBJC_THREAD_LOW_PRIORITY:
 199       sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
 200       break;
 201     }
 202
 203   /* Change the priority.  */
 204   if (pthread_setprio (__gthrw_pthread_self (), sys_priority) >= 0)
 205     return 0;
 206   else
 207     /* Failed */
 208     return -1;
 209 }
 210
 211 /* Return the current thread's priority.  */
 212 static inline int
 213 __gthread_objc_thread_get_priority (void)
 214 {
 215   int sys_priority;
 216
 217   if (__gthread_active_p ())
 218     {
 219       if ((sys_priority = pthread_getprio (__gthrw_pthread_self ())) >= 0)
 220         {
 221           if (sys_priority >= PRI_FG_MIN_NP
 222               && sys_priority <= PRI_FG_MAX_NP)
 223             return OBJC_THREAD_INTERACTIVE_PRIORITY;
 224           if (sys_priority >= PRI_BG_MIN_NP
 225               && sys_priority <= PRI_BG_MAX_NP)
 226             return OBJC_THREAD_BACKGROUND_PRIORITY;
 227           return OBJC_THREAD_LOW_PRIORITY;
 228         }
 229
 230       /* Failed */
 231       return -1;
 232     }
 233   else
 234     return OBJC_THREAD_INTERACTIVE_PRIORITY;
 235 }
 236
 237 /* Yield our process time to another thread.  */
 238 static inline void
 239 __gthread_objc_thread_yield (void)
 240 {
 241   if (__gthread_active_p ())
 242     __gthrw_pthread_yield ();
 243 }
 244
 245 /* Terminate the current thread.  */
 246 static inline int
 247 __gthread_objc_thread_exit (void)
 248 {
 249   if (__gthread_active_p ())
 250     /* exit the thread */
 251     __gthrw_pthread_exit (&__objc_thread_exit_status);
 252
 253   /* Failed if we reached here */
 254   return -1;
 255 }
 256
 257 /* Returns an integer value which uniquely describes a thread.  */
 258 static inline objc_thread_t
 259 __gthread_objc_thread_id (void)
 260 {
 261   if (__gthread_active_p ())
 262     {
 263       pthread_t self = __gthrw_pthread_self ();
 264
 265       return (objc_thread_t) __gthrw_pthread_getunique_np (&self);
 266     }
 267   else
 268     return (objc_thread_t) 1;
 269 }
 270
 271 /* Sets the thread's local storage pointer.  */
 272 static inline int
 273 __gthread_objc_thread_set_data (void *value)
 274 {
 275   if (__gthread_active_p ())
 276     return __gthrw_pthread_setspecific (_objc_thread_storage, value);
 277   else
 278     {
 279       thread_local_storage = value;
 280       return 0;
 281     }
 282 }
 283
 284 /* Returns the thread's local storage pointer.  */
 285 static inline void *
 286 __gthread_objc_thread_get_data (void)
 287 {
 288   void *value = NULL;
 289
 290   if (__gthread_active_p ())
 291     {
 292       if (!(__gthrw_pthread_getspecific (_objc_thread_storage, &value)))
 293         return value;
 294
 295       return NULL;
 296     }
 297   else
 298     return thread_local_storage;
 299 }
 300
 301 /* Backend mutex functions */
 302
 303 /* Allocate a mutex.  */
 304 static inline int
 305 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
 306 {
 307   if (__gthread_active_p ())
 308     {
 309       mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
 310
 311       if (__gthrw_pthread_mutex_init ((pthread_mutex_t *) mutex->backend,
 312                               pthread_mutexattr_default))
 313         {
 314           objc_free (mutex->backend);
 315           mutex->backend = NULL;
 316           return -1;
 317         }
 318     }
 319
 320   return 0;
 321 }
 322
 323 /* Deallocate a mutex.  */
 324 static inline int
 325 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
 326 {
 327   if (__gthread_active_p ())
 328     {
 329       if (__gthrw_pthread_mutex_destroy ((pthread_mutex_t *) mutex->backend))
 330         return -1;
 331
 332       objc_free (mutex->backend);
 333       mutex->backend = NULL;
 334     }
 335
 336   return 0;
 337 }
 338
 339 /* Grab a lock on a mutex.  */
 340 static inline int
 341 __gthread_objc_mutex_lock (objc_mutex_t mutex)
 342 {
 343   if (__gthread_active_p ())
 344     return __gthrw_pthread_mutex_lock ((pthread_mutex_t *) mutex->backend);
 345   else
 346     return 0;
 347 }
 348
 349 /* Try to grab a lock on a mutex.  */
 350 static inline int
 351 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
 352 {
 353   if (__gthread_active_p ()
 354       && __gthrw_pthread_mutex_trylock ((pthread_mutex_t *) mutex->backend) != 1)
 355     return -1;
 356
 357   return 0;
 358 }
 359
 360 /* Unlock the mutex */
 361 static inline int
 362 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
 363 {
 364   if (__gthread_active_p ())
 365     return __gthrw_pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend);
 366   else
 367     return 0;
 368 }
 369
 370 /* Backend condition mutex functions */
 371
 372 /* Allocate a condition.  */
 373 static inline int
 374 __gthread_objc_condition_allocate (objc_condition_t condition)
 375 {
 376   if (__gthread_active_p ())
 377     /* Unimplemented.  */
 378     return -1;
 379   else
 380     return 0;
 381 }
 382
 383 /* Deallocate a condition.  */
 384 static inline int
 385 __gthread_objc_condition_deallocate (objc_condition_t condition)
 386 {
 387   if (__gthread_active_p ())
 388     /* Unimplemented.  */
 389     return -1;
 390   else
 391     return 0;
 392 }
 393
 394 /* Wait on the condition */
 395 static inline int
 396 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
 397 {
 398   if (__gthread_active_p ())
 399     /* Unimplemented.  */
 400     return -1;
 401   else
 402     return 0;
 403 }
 404
 405 /* Wake up all threads waiting on this condition.  */
 406 static inline int
 407 __gthread_objc_condition_broadcast (objc_condition_t condition)
 408 {
 409   if (__gthread_active_p ())
 410     /* Unimplemented.  */
 411     return -1;
 412   else
 413     return 0;
 414 }
 415
 416 /* Wake up one thread waiting on this condition.  */
 417 static inline int
 418 __gthread_objc_condition_signal (objc_condition_t condition)
 419 {
 420   if (__gthread_active_p ())
 421     /* Unimplemented.  */
 422     return -1;
 423   else
 424     return 0;
 425 }
 426
 427 #else /* _LIBOBJC */
 428
 429 static inline int
 430 __gthread_once (__gthread_once_t *once, void (*func) (void))
 431 {
 432   if (__gthread_active_p ())
 433     return __gthrw_pthread_once (once, func);
 434   else
 435     return -1;
 436 }
 437
 438 static inline int
 439 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
 440 {
 441   return __gthrw_pthread_keycreate (key, dtor);
 442 }
 443
 444 static inline int
 445 __gthread_key_delete (UNUSED (__gthread_key_t key))
 446 {
 447   /* Operation is not supported.  */
 448   return -1;
 449 }
 450
 451 static inline void *
 452 __gthread_getspecific (__gthread_key_t key)
 453 {
 454   void *ptr;
 455   if (__gthrw_pthread_getspecific (key, &ptr) == 0)
 456     return ptr;
 457   else
 458     return 0;
 459 }
 460
 461 static inline int
 462 __gthread_setspecific (__gthread_key_t key, const void *ptr)
 463 {
 464   return __gthrw_pthread_setspecific (key, (void *) ptr);
 465 }
 466
 467 static inline void
 468 __gthread_mutex_init_function (__gthread_mutex_t *mutex)
 469 {
 470   if (__gthread_active_p ())
 471     __gthrw_pthread_mutex_init (mutex, pthread_mutexattr_default);
 472 }
 473
 474 static inline int
 475 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 476 {
 477   if (__gthread_active_p ())
 478     return __gthrw_pthread_mutex_lock (mutex);
 479   else
 480     return 0;
 481 }
 482
 483 static inline int
 484 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 485 {
 486   if (__gthread_active_p ())
 487     return __gthrw_pthread_mutex_trylock (mutex);
 488   else
 489     return 0;
 490 }
 491
 492 static inline int
 493 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 494 {
 495   if (__gthread_active_p ())
 496     return __gthrw_pthread_mutex_unlock (mutex);
 497   else
 498     return 0;
 499 }
 500
 501 static inline int
 502 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
 503 {
 504   if (__gthread_active_p ())
 505     {
 506       pthread_mutexattr_t attr;
 507       int r;
 508
 509       r = __gthrw_pthread_mutexattr_create (&attr);
 510       if (!r)
 511         r = __gthrw_pthread_mutexattr_setkind_np (&attr, MUTEX_RECURSIVE_NP);
 512       if (!r)
 513         r = __gthrw_pthread_mutex_init (mutex, attr);
 514       if (!r)
 515         r = __gthrw_pthread_mutexattr_delete (&attr);
 516       return r;
 517     }
 518 }
 519
 520 static inline int
 521 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
 522 {
 523   return __gthread_mutex_lock (mutex);
 524 }
 525
 526 static inline int
 527 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
 528 {
 529   return __gthread_mutex_trylock (mutex);
 530 }
 531
 532 static inline int
 533 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
 534 {
 535   return __gthread_mutex_unlock (mutex);
 536 }
 537
 538 #endif /* _LIBOBJC */
 539
 540 #undef UNUSED
 541
 542 #endif
 543 #endif /* ! GCC_GTHR_DCE_H */