gcc/gthr-solaris.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000, 2004, 2005, 2006
   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_SOLARIS_H
  31 #define GCC_GTHR_SOLARIS_H
  32
  33 /* Solaris threads as found in Solaris 2.[456].
  34    Actually these are Unix International (UI) threads, but I don't
  35    know if anyone else implements these.  */
  36
  37 #define __GTHREADS 1
  38
  39 #include <thread.h>
  40 #include <errno.h>
  41
  42 #ifdef __cplusplus
  43 #define UNUSED(x)
  44 #else
  45 #define UNUSED(x) x __attribute__((unused))
  46 #endif
  47
  48 typedef thread_key_t __gthread_key_t;
  49 typedef struct {
  50   mutex_t mutex;
  51   int once;
  52 } __gthread_once_t;
  53 typedef mutex_t __gthread_mutex_t;
  54
  55 typedef struct {
  56   long depth;
  57   thread_t owner;
  58   mutex_t actual;
  59 } __gthread_recursive_mutex_t;
  60
  61 #define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 }
  62 #define __GTHREAD_MUTEX_INIT DEFAULTMUTEX
  63 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  64
  65 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  66 # define __gthrw(name) \
  67   static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
  68 # define __gthrw_(name) __gthrw_ ## name
  69 #else
  70 # define __gthrw(name)
  71 # define __gthrw_(name) name
  72 #endif
  73
  74 __gthrw(thr_keycreate)
  75 __gthrw(thr_getspecific)
  76 __gthrw(thr_setspecific)
  77 __gthrw(thr_create)
  78 __gthrw(thr_self)
  79
  80 __gthrw(mutex_init)
  81 __gthrw(mutex_destroy)
  82 __gthrw(mutex_lock)
  83 __gthrw(mutex_trylock)
  84 __gthrw(mutex_unlock)
  85
  86 #ifdef _LIBOBJC
  87 __gthrw(thr_exit)
  88 __gthrw(thr_getprio)
  89 __gthrw(thr_setprio)
  90 __gthrw(thr_yield)
  91
  92 __gthrw(cond_init)
  93 __gthrw(cond_destroy)
  94 __gthrw(cond_wait)
  95 __gthrw(cond_broadcast)
  96 __gthrw(cond_signal)
  97
  98 #endif
  99
 100 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
 101
 102 /* This will not actually work in Solaris 2.5, since libc contains
 103    dummy symbols of all thr_* routines.  */
 104
 105 static inline int
 106 __gthread_active_p (void)
 107 {
 108   static void *const __gthread_active_ptr = (void *) &__gthrw_(thr_create);
 109   return __gthread_active_ptr != 0;
 110 }
 111
 112 #else /* not SUPPORTS_WEAK */
 113
 114 static inline int
 115 __gthread_active_p (void)
 116 {
 117   return 1;
 118 }
 119
 120 #endif /* SUPPORTS_WEAK */
 121
 122 #ifdef _LIBOBJC
 123
 124 /* Key structure for maintaining thread specific storage */
 125 static thread_key_t _objc_thread_storage;
 126
 127 /* Thread local storage for a single thread */
 128 static void *thread_local_storage = NULL;
 129
 130 /* Backend initialization functions */
 131
 132 /* Initialize the threads subsystem.  */
 133 static inline int
 134 __gthread_objc_init_thread_system (void)
 135 {
 136   /* Initialize the thread storage key.  */
 137   if (__gthread_active_p ()
 138       && __gthrw_(thr_keycreate) (&_objc_thread_storage, NULL) == 0)
 139     return 0;
 140
 141   return -1;
 142 }
 143
 144 /* Close the threads subsystem.  */
 145 static inline int
 146 __gthread_objc_close_thread_system (void)
 147 {
 148   if (__gthread_active_p ())
 149     return 0;
 150   else
 151     return -1;
 152 }
 153
 154 /* Backend thread functions */
 155
 156 /* Create a new thread of execution.  */
 157 static inline objc_thread_t
 158 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
 159 {
 160   objc_thread_t thread_id;
 161   thread_t new_thread_id = 0;
 162
 163   if (!__gthread_active_p ())
 164     return NULL;
 165
 166   if (__gthrw_(thr_create) (NULL, 0, (void *) func, arg,
 167                   THR_DETACHED | THR_NEW_LWP,
 168                   &new_thread_id) == 0)
 169     thread_id = *(objc_thread_t *) &new_thread_id;
 170   else
 171     thread_id = NULL;
 172
 173   return thread_id;
 174 }
 175
 176 /* Set the current thread's priority.  */
 177 static inline int
 178 __gthread_objc_thread_set_priority (int priority)
 179 {
 180   int sys_priority = 0;
 181
 182   if (!__gthread_active_p ())
 183     return -1;
 184
 185   switch (priority)
 186     {
 187     case OBJC_THREAD_INTERACTIVE_PRIORITY:
 188       sys_priority = 300;
 189       break;
 190     default:
 191     case OBJC_THREAD_BACKGROUND_PRIORITY:
 192       sys_priority = 200;
 193       break;
 194     case OBJC_THREAD_LOW_PRIORITY:
 195       sys_priority = 1000;
 196       break;
 197     }
 198
 199   /* Change priority */
 200   if (__gthrw_(thr_setprio) (__gthrw_(thr_self) (), sys_priority) == 0)
 201     return 0;
 202   else
 203     return -1;
 204 }
 205
 206 /* Return the current thread's priority.  */
 207 static inline int
 208 __gthread_objc_thread_get_priority (void)
 209 {
 210   int sys_priority;
 211
 212   if (!__gthread_active_p ())
 213     return OBJC_THREAD_INTERACTIVE_PRIORITY;
 214
 215   if (__gthrw_(thr_getprio) (__gthrw_(thr_self) (), &sys_priority) == 0)
 216     {
 217       if (sys_priority >= 250)
 218         return OBJC_THREAD_INTERACTIVE_PRIORITY;
 219       else if (sys_priority >= 150)
 220         return OBJC_THREAD_BACKGROUND_PRIORITY;
 221       return OBJC_THREAD_LOW_PRIORITY;
 222     }
 223
 224   /* Couldn't get priority.  */
 225   return -1;
 226 }
 227
 228 /* Yield our process time to another thread.  */
 229 static inline void
 230 __gthread_objc_thread_yield (void)
 231 {
 232   if (__gthread_active_p ())
 233     __gthrw_(thr_yield) ();
 234 }
 235
 236 /* Terminate the current thread.  */
 237 static inline int
 238 __gthread_objc_thread_exit (void)
 239 {
 240   if (__gthread_active_p ())
 241     /* exit the thread */
 242     __gthrw_(thr_exit) (&__objc_thread_exit_status);
 243
 244   /* Failed if we reached here */
 245   return -1;
 246 }
 247
 248 /* Returns an integer value which uniquely describes a thread.  */
 249 static inline objc_thread_t
 250 __gthread_objc_thread_id (void)
 251 {
 252   if (__gthread_active_p ())
 253     return (objc_thread_t) __gthrw_(thr_self) ();
 254   else
 255     return (objc_thread_t) 1;
 256 }
 257
 258 /* Sets the thread's local storage pointer.  */
 259 static inline int
 260 __gthread_objc_thread_set_data (void *value)
 261 {
 262   if (__gthread_active_p ())
 263     {
 264       if (__gthrw_(thr_setspecific) (_objc_thread_storage, value) == 0)
 265         return 0;
 266       else
 267         return -1;
 268     }
 269   else
 270     {
 271       thread_local_storage = value;
 272       return 0;
 273     }
 274 }
 275
 276 /* Returns the thread's local storage pointer.  */
 277 static inline void *
 278 __gthread_objc_thread_get_data (void)
 279 {
 280   void *value = NULL;
 281
 282   if (__gthread_active_p ())
 283     {
 284       if (__gthrw_(thr_getspecific) (_objc_thread_storage, &value) == 0)
 285         return value;
 286       else
 287         return NULL;
 288     }
 289   else
 290     return thread_local_storage;
 291 }
 292
 293 /* Backend mutex functions */
 294
 295 /* Allocate a mutex.  */
 296 static inline int
 297 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
 298 {
 299   if (__gthread_active_p ()
 300       && __gthrw_(mutex_init) ((mutex_t *) (&(mutex->backend)), USYNC_THREAD, 0))
 301     return -1;
 302
 303   return 0;
 304 }
 305
 306 /* Deallocate a mutex.  */
 307 static inline int
 308 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
 309 {
 310   if (__gthread_active_p ())
 311     __gthrw_(mutex_destroy) ((mutex_t *) (&(mutex->backend)));
 312
 313   return 0;
 314 }
 315
 316 /* Grab a lock on a mutex.  */
 317 static inline int
 318 __gthread_objc_mutex_lock (objc_mutex_t mutex)
 319 {
 320   if (__gthread_active_p ()
 321       && __gthrw_(mutex_lock) ((mutex_t *) (&(mutex->backend))) != 0)
 322     return -1;
 323
 324   return 0;
 325 }
 326
 327 /* Try to grab a lock on a mutex.  */
 328 static inline int
 329 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
 330 {
 331   if (__gthread_active_p ()
 332       && __gthrw_(mutex_trylock) ((mutex_t *) (&(mutex->backend))) != 0)
 333     return -1;
 334
 335   return 0;
 336 }
 337
 338 /* Unlock the mutex */
 339 static inline int
 340 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
 341 {
 342   if (__gthread_active_p ()
 343       && __gthrw_(mutex_unlock) ((mutex_t *) (&(mutex->backend))) != 0)
 344     return -1;
 345
 346   return 0;
 347 }
 348
 349 /* Backend condition mutex functions */
 350
 351 /* Allocate a condition.  */
 352 static inline int
 353 __gthread_objc_condition_allocate (objc_condition_t condition)
 354 {
 355   if (__gthread_active_p ())
 356     return __gthrw_(cond_init) ((cond_t *) (&(condition->backend)), USYNC_THREAD,
 357                       NULL);
 358   else
 359     return 0;
 360 }
 361
 362 /* Deallocate a condition.  */
 363 static inline int
 364 __gthread_objc_condition_deallocate (objc_condition_t condition)
 365 {
 366   if (__gthread_active_p ())
 367     return __gthrw_(cond_destroy) ((cond_t *) (&(condition->backend)));
 368   else
 369     return 0;
 370 }
 371
 372 /* Wait on the condition */
 373 static inline int
 374 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
 375 {
 376   if (__gthread_active_p ())
 377     return __gthrw_(cond_wait) ((cond_t *) (&(condition->backend)),
 378                       (mutex_t *) (&(mutex->backend)));
 379   else
 380     return 0;
 381 }
 382
 383 /* Wake up all threads waiting on this condition.  */
 384 static inline int
 385 __gthread_objc_condition_broadcast (objc_condition_t condition)
 386 {
 387   if (__gthread_active_p ())
 388     return __gthrw_(cond_broadcast) ((cond_t *) (&(condition->backend)));
 389   else
 390     return 0;
 391 }
 392
 393 /* Wake up one thread waiting on this condition.  */
 394 static inline int
 395 __gthread_objc_condition_signal (objc_condition_t condition)
 396 {
 397   if (__gthread_active_p ())
 398     return __gthrw_(cond_signal) ((cond_t *) (&(condition->backend)));
 399   else
 400     return 0;
 401 }
 402
 403 #else /* _LIBOBJC */
 404
 405 static inline int
 406 __gthread_once (__gthread_once_t *once, void (*func) (void))
 407 {
 408   if (! __gthread_active_p ())
 409     return -1;
 410
 411   if (once == 0 || func == 0)
 412     return EINVAL;
 413
 414   if (once->once == 0)
 415     {
 416       int status = __gthrw_(mutex_lock) (&once->mutex);
 417       if (status != 0)
 418         return status;
 419       if (once->once == 0)
 420         {
 421           (*func) ();
 422           once->once++;
 423         }
 424       __gthrw_(mutex_unlock) (&once->mutex);
 425     }
 426   return 0;
 427 }
 428
 429 static inline int
 430 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
 431 {
 432   /* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually
 433      got a reasonable key value, and if not, fail.  */
 434   *key = (__gthread_key_t)-1;
 435   if (__gthrw_(thr_keycreate) (key, dtor) != 0 || *key == (__gthread_key_t)-1)
 436     return -1;
 437   else
 438     return 0;
 439 }
 440
 441 static inline int
 442 __gthread_key_delete (__gthread_key_t UNUSED (key))
 443 {
 444   /* Not possible.  */
 445   return -1;
 446 }
 447
 448 static inline void *
 449 __gthread_getspecific (__gthread_key_t key)
 450 {
 451   void *ptr;
 452   if (__gthrw_(thr_getspecific) (key, &ptr) == 0)
 453     return ptr;
 454   else
 455     return 0;
 456 }
 457
 458 static inline int
 459 __gthread_setspecific (__gthread_key_t key, const void *ptr)
 460 {
 461   return __gthrw_(thr_setspecific) (key, (void *) ptr);
 462 }
 463
 464 static inline int
 465 __gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
 466 {
 467   if (__gthread_active_p ())
 468     return __gthrw_(mutex_destroy) (mutex);
 469   else
 470     return 0;
 471 }
 472
 473 static inline int
 474 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 475 {
 476   if (__gthread_active_p ())
 477     return __gthrw_(mutex_lock) (mutex);
 478   else
 479     return 0;
 480 }
 481
 482 static inline int
 483 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 484 {
 485   if (__gthread_active_p ())
 486     return __gthrw_(mutex_trylock) (mutex);
 487   else
 488     return 0;
 489 }
 490
 491 static inline int
 492 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 493 {
 494   if (__gthread_active_p ())
 495     return __gthrw_(mutex_unlock) (mutex);
 496   else
 497     return 0;
 498 }
 499
 500 static inline int
 501 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
 502 {
 503   mutex->depth = 0;
 504   mutex->owner = (thread_t) 0;
 505   return __gthrw_(mutex_init) (&mutex->actual, USYNC_THREAD, 0);
 506 }
 507
 508 static inline int
 509 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
 510 {
 511   if (__gthread_active_p ())
 512     {
 513       thread_t me = __gthrw_(thr_self) ();
 514
 515       if (mutex->owner != me)
 516         {
 517           __gthrw_(mutex_lock) (&mutex->actual);
 518           mutex->owner = me;
 519         }
 520
 521       mutex->depth++;
 522     }
 523   return 0;
 524 }
 525
 526 static inline int
 527 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
 528 {
 529   if (__gthread_active_p ())
 530     {
 531       thread_t me = __gthrw_(thr_self) ();
 532
 533       if (mutex->owner != me)
 534         {
 535           if (__gthrw_(mutex_trylock) (&mutex->actual))
 536             return 1;
 537           mutex->owner = me;
 538         }
 539
 540       mutex->depth++;
 541     }
 542   return 0;
 543 }
 544
 545 static inline int
 546 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
 547 {
 548   if (__gthread_active_p ())
 549     {
 550       if (--mutex->depth == 0)
 551         {
 552            mutex->owner = (thread_t) 0;
 553            __gthrw_(mutex_unlock) (&mutex->actual);
 554         }
 555     }
 556   return 0;
 557 }
 558
 559 #endif /* _LIBOBJC */
 560
 561 #undef UNUSED
 562
 563 #endif /* ! GCC_GTHR_SOLARIS_H */