gcc/gthr-solaris.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #ifndef GCC_GTHR_SOLARIS_H
  30 #define GCC_GTHR_SOLARIS_H
  31
  32 /* Solaris threads as found in Solaris 2.[456].
  33    Actually these are Unix International (UI) threads, but I don't
  34    know if anyone else implements these.  */
  35
  36 #define __GTHREADS 1
  37
  38 #include <thread.h>
  39 #include <errno.h>
  40
  41 typedef thread_key_t __gthread_key_t;
  42 typedef struct
  43 {
  44   mutex_t mutex;
  45   int once;
  46 } __gthread_once_t;
  47 typedef mutex_t __gthread_mutex_t;
  48
  49 #define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 }
  50 #define __GTHREAD_MUTEX_INIT DEFAULTMUTEX
  51
  52 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  53
  54 #pragma weak thr_keycreate
  55 #pragma weak thr_getspecific
  56 #pragma weak thr_setspecific
  57 #pragma weak thr_create
  58
  59 #pragma weak mutex_lock
  60 #pragma weak mutex_trylock
  61 #pragma weak mutex_unlock
  62
  63 #ifdef _LIBOBJC
  64 #pragma weak thr_exit
  65 #pragma weak thr_keycreate
  66 #pragma weak thr_getprio
  67 #pragma weak thr_self
  68 #pragma weak thr_setprio
  69 #pragma weak thr_yield
  70
  71 #pragma weak cond_init
  72 #pragma weak cond_destroy
  73 #pragma weak cond_wait
  74 #pragma weak cond_broadcast
  75 #pragma weak cond_signal
  76
  77 #pragma weak mutex_init
  78 #pragma weak mutex_destroy
  79 #endif
  80
  81 /* This will not actually work in Solaris 2.5, since libc contains
  82    dummy symbols of all thr_* routines.  */
  83
  84 static void *__gthread_active_ptr = (void *) &thr_create;
  85
  86 static inline int
  87 __gthread_active_p (void)
  88 {
  89   return __gthread_active_ptr != 0;
  90 }
  91
  92 #else /* not SUPPORTS_WEAK */
  93
  94 static inline int
  95 __gthread_active_p (void)
  96 {
  97   return 1;
  98 }
  99
 100 #endif /* SUPPORTS_WEAK */
 101
 102 #ifdef _LIBOBJC
 103
 104 /* Key structure for maintaining thread specific storage */
 105 static thread_key_t _objc_thread_storage;
 106
 107 /* Thread local storage for a single thread */
 108 static void *thread_local_storage = NULL;
 109
 110 /* Backend initialization functions */
 111
 112 /* Initialize the threads subsystem.  */
 113 static inline int
 114 __gthread_objc_init_thread_system(void)
 115 {
 116   /* Initialize the thread storage key */
 117   if (__gthread_active_p ()
 118       && thr_keycreate(&_objc_thread_storage, NULL) == 0)
 119     return 0;
 120
 121   return -1;
 122 }
 123
 124 /* Close the threads subsystem.  */
 125 static inline int
 126 __gthread_objc_close_thread_system(void)
 127 {
 128   if (__gthread_active_p ())
 129     return 0;
 130   else
 131     return -1;
 132 }
 133
 134 /* Backend thread functions */
 135
 136 /* Create a new thread of execution.  */
 137 static inline objc_thread_t
 138 __gthread_objc_thread_detach(void (*func)(void *), void *arg)
 139 {
 140   objc_thread_t thread_id;
 141   thread_t new_thread_id = 0;
 142
 143   if (!__gthread_active_p ())
 144     return NULL;
 145
 146   if (thr_create(NULL, 0, (void *)func, arg,
 147                  THR_DETACHED | THR_NEW_LWP,
 148                  &new_thread_id) == 0)
 149     thread_id = *(objc_thread_t *)&new_thread_id;
 150   else
 151     thread_id = NULL;
 152
 153   return thread_id;
 154 }
 155
 156 /* Set the current thread's priority.  */
 157 static inline int
 158 __gthread_objc_thread_set_priority(int priority)
 159 {
 160   int sys_priority = 0;
 161
 162   if (!__gthread_active_p ())
 163     return -1;
 164
 165   switch (priority)
 166     {
 167     case OBJC_THREAD_INTERACTIVE_PRIORITY:
 168       sys_priority = 300;
 169       break;
 170     default:
 171     case OBJC_THREAD_BACKGROUND_PRIORITY:
 172       sys_priority = 200;
 173       break;
 174     case OBJC_THREAD_LOW_PRIORITY:
 175       sys_priority = 1000;
 176       break;
 177     }
 178
 179   /* Change priority */
 180   if (thr_setprio(thr_self(), sys_priority) == 0)
 181     return 0;
 182   else
 183     return -1;
 184 }
 185
 186 /* Return the current thread's priority.  */
 187 static inline int
 188 __gthread_objc_thread_get_priority(void)
 189 {
 190   int sys_priority;
 191
 192   if (!__gthread_active_p ())
 193     return OBJC_THREAD_INTERACTIVE_PRIORITY;
 194
 195   if (thr_getprio(thr_self(), &sys_priority) == 0)
 196     {
 197       if (sys_priority >= 250)
 198         return OBJC_THREAD_INTERACTIVE_PRIORITY;
 199       else if (sys_priority >= 150)
 200         return OBJC_THREAD_BACKGROUND_PRIORITY;
 201       return OBJC_THREAD_LOW_PRIORITY;
 202     }
 203
 204   /* Couldn't get priority.  */
 205   return -1;
 206 }
 207
 208 /* Yield our process time to another thread.  */
 209 static inline void
 210 __gthread_objc_thread_yield(void)
 211 {
 212   if (__gthread_active_p ())
 213     thr_yield();
 214 }
 215
 216 /* Terminate the current thread.  */
 217 static inline int
 218 __gthread_objc_thread_exit(void)
 219 {
 220   if (__gthread_active_p ())
 221     /* exit the thread */
 222     thr_exit(&__objc_thread_exit_status);
 223
 224   /* Failed if we reached here */
 225   return -1;
 226 }
 227
 228 /* Returns an integer value which uniquely describes a thread.  */
 229 static inline objc_thread_t
 230 __gthread_objc_thread_id(void)
 231 {
 232   if (__gthread_active_p ())
 233     return (objc_thread_t)thr_self();
 234   else
 235     return (objc_thread_t)1;
 236 }
 237
 238 /* Sets the thread's local storage pointer.  */
 239 static inline int
 240 __gthread_objc_thread_set_data(void *value)
 241 {
 242   if (__gthread_active_p ())
 243     {
 244       if (thr_setspecific(_objc_thread_storage, value) == 0)
 245         return 0;
 246       else
 247         return -1;
 248     }
 249   else
 250     {
 251       thread_local_storage = value;
 252       return 0;
 253     }
 254 }
 255
 256 /* Returns the thread's local storage pointer.  */
 257 static inline void *
 258 __gthread_objc_thread_get_data(void)
 259 {
 260   void *value = NULL;
 261
 262   if (__gthread_active_p ())
 263     {
 264       if (thr_getspecific(_objc_thread_storage, &value) == 0)
 265         return value;
 266       else
 267         return NULL;
 268     }
 269   else
 270     return thread_local_storage;
 271 }
 272
 273 /* Backend mutex functions */
 274
 275 /* Allocate a mutex.  */
 276 static inline int
 277 __gthread_objc_mutex_allocate(objc_mutex_t mutex)
 278 {
 279   if (__gthread_active_p ()
 280       && mutex_init( (mutex_t *)(&(mutex->backend)), USYNC_THREAD, 0))
 281     return -1;
 282
 283   return 0;
 284 }
 285
 286 /* Deallocate a mutex.  */
 287 static inline int
 288 __gthread_objc_mutex_deallocate(objc_mutex_t mutex)
 289 {
 290   if (__gthread_active_p ())
 291     mutex_destroy((mutex_t *)(&(mutex->backend)));
 292
 293   return 0;
 294 }
 295
 296 /* Grab a lock on a mutex.  */
 297 static inline int
 298 __gthread_objc_mutex_lock(objc_mutex_t mutex)
 299 {
 300   if (__gthread_active_p ()
 301       && mutex_lock((mutex_t *)(&(mutex->backend))) != 0)
 302     return -1;
 303
 304   return 0;
 305 }
 306
 307 /* Try to grab a lock on a mutex.  */
 308 static inline int
 309 __gthread_objc_mutex_trylock(objc_mutex_t mutex)
 310 {
 311   if (__gthread_active_p ()
 312       && mutex_trylock((mutex_t *)(&(mutex->backend))) != 0)
 313     return -1;
 314
 315   return 0;
 316 }
 317
 318 /* Unlock the mutex */
 319 static inline int
 320 __gthread_objc_mutex_unlock(objc_mutex_t mutex)
 321 {
 322   if (__gthread_active_p ()
 323       && mutex_unlock((mutex_t *)(&(mutex->backend))) != 0)
 324     return -1;
 325
 326   return 0;
 327 }
 328
 329 /* Backend condition mutex functions */
 330
 331 /* Allocate a condition.  */
 332 static inline int
 333 __gthread_objc_condition_allocate(objc_condition_t condition)
 334 {
 335   if (__gthread_active_p ())
 336     return cond_init((cond_t *)(&(condition->backend)), USYNC_THREAD,
 337                      NULL);
 338   else
 339     return 0;
 340 }
 341
 342 /* Deallocate a condition.  */
 343 static inline int
 344 __gthread_objc_condition_deallocate(objc_condition_t condition)
 345 {
 346   if (__gthread_active_p ())
 347     return cond_destroy((cond_t *)(&(condition->backend)));
 348   else
 349     return 0;
 350 }
 351
 352 /* Wait on the condition */
 353 static inline int
 354 __gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
 355 {
 356   if (__gthread_active_p ())
 357     return cond_wait((cond_t *)(&(condition->backend)),
 358                      (mutex_t *)(&(mutex->backend)));
 359   else
 360     return 0;
 361 }
 362
 363 /* Wake up all threads waiting on this condition.  */
 364 static inline int
 365 __gthread_objc_condition_broadcast(objc_condition_t condition)
 366 {
 367   if (__gthread_active_p ())
 368     return cond_broadcast((cond_t *)(&(condition->backend)));
 369   else
 370     return 0;
 371 }
 372
 373 /* Wake up one thread waiting on this condition.  */
 374 static inline int
 375 __gthread_objc_condition_signal(objc_condition_t condition)
 376 {
 377   if (__gthread_active_p ())
 378     return cond_signal((cond_t *)(&(condition->backend)));
 379   else
 380     return 0;
 381 }
 382
 383 #else /* _LIBOBJC */
 384
 385 static inline int
 386 __gthread_once (__gthread_once_t *once, void (*func) (void))
 387 {
 388   if (! __gthread_active_p ())
 389     return -1;
 390
 391   if (once == 0 || func == 0)
 392     return EINVAL;
 393
 394   if (once->once == 0)
 395     {
 396       int status = mutex_lock (&once->mutex);
 397       if (status != 0)
 398         return status;
 399       if (once->once == 0)
 400         {
 401           (*func) ();
 402           once->once ++;
 403         }
 404       mutex_unlock (&once->mutex);
 405     }
 406   return 0;
 407 }
 408
 409 static inline int
 410 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
 411 {
 412   /* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually
 413      got a reasonable key value, and if not, fail.  */
 414   *key = -1;
 415   if (thr_keycreate (key, dtor) != 0 || *key == -1)
 416     return -1;
 417   else
 418     return 0;
 419 }
 420
 421 static inline int
 422 __gthread_key_dtor (__gthread_key_t key, void *ptr)
 423 {
 424   /* Nothing needed.  */
 425   return 0;
 426 }
 427
 428 static inline int
 429 __gthread_key_delete (__gthread_key_t key)
 430 {
 431   /* Not possible.  */
 432   return -1;
 433 }
 434
 435 static inline void *
 436 __gthread_getspecific (__gthread_key_t key)
 437 {
 438   void *ptr;
 439   if (thr_getspecific (key, &ptr) == 0)
 440     return ptr;
 441   else
 442     return 0;
 443 }
 444
 445 static inline int
 446 __gthread_setspecific (__gthread_key_t key, const void *ptr)
 447 {
 448   return thr_setspecific (key, (void *) ptr);
 449 }
 450
 451 static inline int
 452 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 453 {
 454   if (__gthread_active_p ())
 455     return mutex_lock (mutex);
 456   else
 457     return 0;
 458 }
 459
 460 static inline int
 461 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 462 {
 463   if (__gthread_active_p ())
 464     return mutex_trylock (mutex);
 465   else
 466     return 0;
 467 }
 468
 469 static inline int
 470 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 471 {
 472   if (__gthread_active_p ())
 473     return mutex_unlock (mutex);
 474   else
 475     return 0;
 476 }
 477
 478 #endif /* _LIBOBJC */
 479
 480 #endif /* ! GCC_GTHR_SOLARIS_H */