Chih-Hung Hsieh | a5ef72f | 2014-11-05 10:47:59 -0800 | [diff] [blame] | 1 | /* Threads compatibility routines for libgcc2 and libobjc. */ |
| 2 | /* Compile this one with gcc. */ |
| 3 | /* Copyright (C) 1997-2013 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 3, 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 | Under Section 7 of GPL version 3, you are granted additional |
| 18 | permissions described in the GCC Runtime Library Exception, version |
| 19 | 3.1, as published by the Free Software Foundation. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License and |
| 22 | a copy of the GCC Runtime Library Exception along with this program; |
| 23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 24 | <http://www.gnu.org/licenses/>. */ |
| 25 | |
| 26 | #ifndef _GLIBCXX_GCC_GTHR_POSIX_H |
| 27 | #define _GLIBCXX_GCC_GTHR_POSIX_H |
| 28 | |
| 29 | /* POSIX threads specific definitions. |
| 30 | Easy, since the interface is just one-to-one mapping. */ |
| 31 | |
| 32 | #define __GTHREADS 1 |
| 33 | #define __GTHREADS_CXX0X 1 |
| 34 | |
| 35 | #include <pthread.h> |
| 36 | |
| 37 | #if ((defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)) \ |
| 38 | || !defined(_GTHREAD_USE_MUTEX_TIMEDLOCK)) |
| 39 | # include <unistd.h> |
| 40 | # if defined(_POSIX_TIMEOUTS) && _POSIX_TIMEOUTS >= 0 |
| 41 | # define _GTHREAD_USE_MUTEX_TIMEDLOCK 1 |
| 42 | # else |
| 43 | # define _GTHREAD_USE_MUTEX_TIMEDLOCK 0 |
| 44 | # endif |
| 45 | #endif |
| 46 | |
| 47 | typedef pthread_t __gthread_t; |
| 48 | typedef pthread_key_t __gthread_key_t; |
| 49 | typedef pthread_once_t __gthread_once_t; |
| 50 | typedef pthread_mutex_t __gthread_mutex_t; |
| 51 | typedef pthread_mutex_t __gthread_recursive_mutex_t; |
| 52 | typedef pthread_cond_t __gthread_cond_t; |
| 53 | typedef struct timespec __gthread_time_t; |
| 54 | |
| 55 | /* POSIX like conditional variables are supported. Please look at comments |
| 56 | in gthr.h for details. */ |
| 57 | #define __GTHREAD_HAS_COND 1 |
| 58 | |
| 59 | #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER |
| 60 | #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function |
| 61 | #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT |
| 62 | #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER) |
| 63 | #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER |
| 64 | #elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP) |
| 65 | #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP |
| 66 | #else |
| 67 | #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function |
| 68 | #endif |
| 69 | #define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER |
| 70 | #define __GTHREAD_TIME_INIT {0,0} |
| 71 | |
| 72 | #ifdef _GTHREAD_USE_MUTEX_INIT_FUNC |
| 73 | # undef __GTHREAD_MUTEX_INIT |
| 74 | #endif |
| 75 | #ifdef _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC |
| 76 | # undef __GTHREAD_RECURSIVE_MUTEX_INIT |
| 77 | # undef __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION |
| 78 | # define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function |
| 79 | #endif |
| 80 | #ifdef _GTHREAD_USE_COND_INIT_FUNC |
| 81 | # undef __GTHREAD_COND_INIT |
| 82 | # define __GTHREAD_COND_INIT_FUNCTION __gthread_cond_init_function |
| 83 | #endif |
| 84 | |
| 85 | #if __GXX_WEAK__ && _GLIBCXX_GTHREAD_USE_WEAK |
| 86 | # ifndef __gthrw_pragma |
| 87 | # define __gthrw_pragma(pragma) |
| 88 | # endif |
| 89 | # define __gthrw2(name,name2,type) \ |
| 90 | static __typeof(type) name __attribute__ ((__weakref__(#name2))); \ |
| 91 | __gthrw_pragma(weak type) |
| 92 | # define __gthrw_(name) __gthrw_ ## name |
| 93 | #else |
| 94 | # define __gthrw2(name,name2,type) |
| 95 | # define __gthrw_(name) name |
| 96 | #endif |
| 97 | |
| 98 | /* Typically, __gthrw_foo is a weak reference to symbol foo. */ |
| 99 | #define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name) |
| 100 | |
| 101 | __gthrw(pthread_once) |
| 102 | __gthrw(pthread_getspecific) |
| 103 | __gthrw(pthread_setspecific) |
| 104 | |
| 105 | __gthrw(pthread_create) |
| 106 | __gthrw(pthread_join) |
| 107 | __gthrw(pthread_equal) |
| 108 | __gthrw(pthread_self) |
| 109 | __gthrw(pthread_detach) |
| 110 | #ifndef __BIONIC__ |
| 111 | __gthrw(pthread_cancel) |
| 112 | #endif |
| 113 | __gthrw(sched_yield) |
| 114 | |
| 115 | __gthrw(pthread_mutex_lock) |
| 116 | __gthrw(pthread_mutex_trylock) |
| 117 | #if _GTHREAD_USE_MUTEX_TIMEDLOCK |
| 118 | __gthrw(pthread_mutex_timedlock) |
| 119 | #endif |
| 120 | __gthrw(pthread_mutex_unlock) |
| 121 | __gthrw(pthread_mutex_init) |
| 122 | __gthrw(pthread_mutex_destroy) |
| 123 | |
| 124 | __gthrw(pthread_cond_init) |
| 125 | __gthrw(pthread_cond_broadcast) |
| 126 | __gthrw(pthread_cond_signal) |
| 127 | __gthrw(pthread_cond_wait) |
| 128 | __gthrw(pthread_cond_timedwait) |
| 129 | __gthrw(pthread_cond_destroy) |
| 130 | |
| 131 | __gthrw(pthread_key_create) |
| 132 | __gthrw(pthread_key_delete) |
| 133 | __gthrw(pthread_mutexattr_init) |
| 134 | __gthrw(pthread_mutexattr_settype) |
| 135 | __gthrw(pthread_mutexattr_destroy) |
| 136 | |
| 137 | |
| 138 | #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK) |
| 139 | /* Objective-C. */ |
| 140 | __gthrw(pthread_exit) |
| 141 | #ifdef _POSIX_PRIORITY_SCHEDULING |
| 142 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
| 143 | __gthrw(sched_get_priority_max) |
| 144 | __gthrw(sched_get_priority_min) |
| 145 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
| 146 | #endif /* _POSIX_PRIORITY_SCHEDULING */ |
| 147 | __gthrw(pthread_attr_destroy) |
| 148 | __gthrw(pthread_attr_init) |
| 149 | __gthrw(pthread_attr_setdetachstate) |
| 150 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
| 151 | __gthrw(pthread_getschedparam) |
| 152 | __gthrw(pthread_setschedparam) |
| 153 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
| 154 | #endif /* _LIBOBJC || _LIBOBJC_WEAK */ |
| 155 | |
| 156 | #if __GXX_WEAK__ && _GLIBCXX_GTHREAD_USE_WEAK |
| 157 | |
| 158 | /* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if |
| 159 | -pthreads is not specified. The functions are dummies and most return an |
| 160 | error value. However pthread_once returns 0 without invoking the routine |
| 161 | it is passed so we cannot pretend that the interface is active if -pthreads |
| 162 | is not specified. On Solaris 2.5.1, the interface is not exposed at all so |
| 163 | we need to play the usual game with weak symbols. On Solaris 10 and up, a |
| 164 | working interface is always exposed. On FreeBSD 6 and later, libc also |
| 165 | exposes a dummy POSIX threads interface, similar to what Solaris 2.6 up |
| 166 | to 9 does. FreeBSD >= 700014 even provides a pthread_cancel stub in libc, |
| 167 | which means the alternate __gthread_active_p below cannot be used there. */ |
| 168 | |
| 169 | #if defined(__FreeBSD__) || (defined(__sun) && defined(__svr4__)) |
| 170 | |
| 171 | static volatile int __gthread_active = -1; |
| 172 | |
| 173 | static void |
| 174 | __gthread_trigger (void) |
| 175 | { |
| 176 | __gthread_active = 1; |
| 177 | } |
| 178 | |
| 179 | static inline int |
| 180 | __gthread_active_p (void) |
| 181 | { |
| 182 | static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 183 | static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT; |
| 184 | |
| 185 | /* Avoid reading __gthread_active twice on the main code path. */ |
| 186 | int __gthread_active_latest_value = __gthread_active; |
| 187 | |
| 188 | /* This test is not protected to avoid taking a lock on the main code |
| 189 | path so every update of __gthread_active in a threaded program must |
| 190 | be atomic with regard to the result of the test. */ |
| 191 | if (__builtin_expect (__gthread_active_latest_value < 0, 0)) |
| 192 | { |
| 193 | if (__gthrw_(pthread_once)) |
| 194 | { |
| 195 | /* If this really is a threaded program, then we must ensure that |
| 196 | __gthread_active has been set to 1 before exiting this block. */ |
| 197 | __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex); |
| 198 | __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger); |
| 199 | __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex); |
| 200 | } |
| 201 | |
| 202 | /* Make sure we'll never enter this block again. */ |
| 203 | if (__gthread_active < 0) |
| 204 | __gthread_active = 0; |
| 205 | |
| 206 | __gthread_active_latest_value = __gthread_active; |
| 207 | } |
| 208 | |
| 209 | return __gthread_active_latest_value != 0; |
| 210 | } |
| 211 | |
| 212 | #else /* neither FreeBSD nor Solaris */ |
| 213 | |
| 214 | /* For a program to be multi-threaded the only thing that it certainly must |
| 215 | be using is pthread_create. However, there may be other libraries that |
| 216 | intercept pthread_create with their own definitions to wrap pthreads |
| 217 | functionality for some purpose. In those cases, pthread_create being |
| 218 | defined might not necessarily mean that libpthread is actually linked |
| 219 | in. |
| 220 | |
| 221 | For the GNU C library, we can use a known internal name. This is always |
| 222 | available in the ABI, but no other library would define it. That is |
| 223 | ideal, since any public pthread function might be intercepted just as |
| 224 | pthread_create might be. __pthread_key_create is an "internal" |
| 225 | implementation symbol, but it is part of the public exported ABI. Also, |
| 226 | it's among the symbols that the static libpthread.a always links in |
| 227 | whenever pthread_create is used, so there is no danger of a false |
| 228 | negative result in any statically-linked, multi-threaded program. |
| 229 | |
| 230 | For others, we choose pthread_cancel as a function that seems unlikely |
| 231 | to be redefined by an interceptor library. The bionic (Android) C |
| 232 | library does not provide pthread_cancel, so we do use pthread_create |
| 233 | there (and interceptor libraries lose). */ |
| 234 | |
| 235 | #ifdef __GLIBC__ |
| 236 | __gthrw2(__gthrw_(__pthread_key_create), |
| 237 | __pthread_key_create, |
| 238 | pthread_key_create) |
| 239 | # define GTHR_ACTIVE_PROXY __gthrw_(__pthread_key_create) |
| 240 | #elif defined (__BIONIC__) |
| 241 | # define GTHR_ACTIVE_PROXY __gthrw_(pthread_create) |
| 242 | #else |
| 243 | # define GTHR_ACTIVE_PROXY __gthrw_(pthread_cancel) |
| 244 | #endif |
| 245 | |
| 246 | static inline int |
| 247 | __gthread_active_p (void) |
| 248 | { |
| 249 | static void *const __gthread_active_ptr |
| 250 | = __extension__ (void *) >HR_ACTIVE_PROXY; |
| 251 | return __gthread_active_ptr != 0; |
| 252 | } |
| 253 | |
| 254 | #endif /* FreeBSD or Solaris */ |
| 255 | |
| 256 | #else /* not __GXX_WEAK__ */ |
| 257 | |
| 258 | /* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread |
| 259 | calls in shared flavors of the HP-UX C library. Most of the stubs |
| 260 | have no functionality. The details are described in the "libc cumulative |
| 261 | patch" for each subversion of HP-UX 11. There are two special interfaces |
| 262 | provided for checking whether an application is linked to a shared pthread |
| 263 | library or not. However, these interfaces aren't available in early |
| 264 | libpthread libraries. We also need a test that works for archive |
| 265 | libraries. We can't use pthread_once as some libc versions call the |
| 266 | init function. We also can't use pthread_create or pthread_attr_init |
| 267 | as these create a thread and thereby prevent changing the default stack |
| 268 | size. The function pthread_default_stacksize_np is available in both |
| 269 | the archive and shared versions of libpthread. It can be used to |
| 270 | determine the default pthread stack size. There is a stub in some |
| 271 | shared libc versions which returns a zero size if pthreads are not |
| 272 | active. We provide an equivalent stub to handle cases where libc |
| 273 | doesn't provide one. */ |
| 274 | |
| 275 | #if defined(__hppa__) && defined(__hpux__) |
| 276 | |
| 277 | static volatile int __gthread_active = -1; |
| 278 | |
| 279 | static inline int |
| 280 | __gthread_active_p (void) |
| 281 | { |
| 282 | /* Avoid reading __gthread_active twice on the main code path. */ |
| 283 | int __gthread_active_latest_value = __gthread_active; |
| 284 | size_t __s; |
| 285 | |
| 286 | if (__builtin_expect (__gthread_active_latest_value < 0, 0)) |
| 287 | { |
| 288 | pthread_default_stacksize_np (0, &__s); |
| 289 | __gthread_active = __s ? 1 : 0; |
| 290 | __gthread_active_latest_value = __gthread_active; |
| 291 | } |
| 292 | |
| 293 | return __gthread_active_latest_value != 0; |
| 294 | } |
| 295 | |
| 296 | #else /* not hppa-hpux */ |
| 297 | |
| 298 | static inline int |
| 299 | __gthread_active_p (void) |
| 300 | { |
| 301 | return 1; |
| 302 | } |
| 303 | |
| 304 | #endif /* hppa-hpux */ |
| 305 | |
| 306 | #endif /* __GXX_WEAK__ */ |
| 307 | |
| 308 | #ifdef _LIBOBJC |
| 309 | |
| 310 | /* This is the config.h file in libobjc/ */ |
| 311 | #include <config.h> |
| 312 | |
| 313 | #ifdef HAVE_SCHED_H |
| 314 | # include <sched.h> |
| 315 | #endif |
| 316 | |
| 317 | /* Key structure for maintaining thread specific storage */ |
| 318 | static pthread_key_t _objc_thread_storage; |
| 319 | static pthread_attr_t _objc_thread_attribs; |
| 320 | |
| 321 | /* Thread local storage for a single thread */ |
| 322 | static void *thread_local_storage = NULL; |
| 323 | |
| 324 | /* Backend initialization functions */ |
| 325 | |
| 326 | /* Initialize the threads subsystem. */ |
| 327 | static inline int |
| 328 | __gthread_objc_init_thread_system (void) |
| 329 | { |
| 330 | if (__gthread_active_p ()) |
| 331 | { |
| 332 | /* Initialize the thread storage key. */ |
| 333 | if (__gthrw_(pthread_key_create) (&_objc_thread_storage, NULL) == 0) |
| 334 | { |
| 335 | /* The normal default detach state for threads is |
| 336 | * PTHREAD_CREATE_JOINABLE which causes threads to not die |
| 337 | * when you think they should. */ |
| 338 | if (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0 |
| 339 | && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs, |
| 340 | PTHREAD_CREATE_DETACHED) == 0) |
| 341 | return 0; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | return -1; |
| 346 | } |
| 347 | |
| 348 | /* Close the threads subsystem. */ |
| 349 | static inline int |
| 350 | __gthread_objc_close_thread_system (void) |
| 351 | { |
| 352 | if (__gthread_active_p () |
| 353 | && __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0 |
| 354 | && __gthrw_(pthread_attr_destroy) (&_objc_thread_attribs) == 0) |
| 355 | return 0; |
| 356 | |
| 357 | return -1; |
| 358 | } |
| 359 | |
| 360 | /* Backend thread functions */ |
| 361 | |
| 362 | /* Create a new thread of execution. */ |
| 363 | static inline objc_thread_t |
| 364 | __gthread_objc_thread_detach (void (*func)(void *), void *arg) |
| 365 | { |
| 366 | objc_thread_t thread_id; |
| 367 | pthread_t new_thread_handle; |
| 368 | |
| 369 | if (!__gthread_active_p ()) |
| 370 | return NULL; |
| 371 | |
| 372 | if (!(__gthrw_(pthread_create) (&new_thread_handle, &_objc_thread_attribs, |
| 373 | (void *) func, arg))) |
| 374 | thread_id = (objc_thread_t) new_thread_handle; |
| 375 | else |
| 376 | thread_id = NULL; |
| 377 | |
| 378 | return thread_id; |
| 379 | } |
| 380 | |
| 381 | /* Set the current thread's priority. */ |
| 382 | static inline int |
| 383 | __gthread_objc_thread_set_priority (int priority) |
| 384 | { |
| 385 | if (!__gthread_active_p ()) |
| 386 | return -1; |
| 387 | else |
| 388 | { |
| 389 | #ifdef _POSIX_PRIORITY_SCHEDULING |
| 390 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
| 391 | pthread_t thread_id = __gthrw_(pthread_self) (); |
| 392 | int policy; |
| 393 | struct sched_param params; |
| 394 | int priority_min, priority_max; |
| 395 | |
| 396 | if (__gthrw_(pthread_getschedparam) (thread_id, &policy, ¶ms) == 0) |
| 397 | { |
| 398 | if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1) |
| 399 | return -1; |
| 400 | |
| 401 | if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1) |
| 402 | return -1; |
| 403 | |
| 404 | if (priority > priority_max) |
| 405 | priority = priority_max; |
| 406 | else if (priority < priority_min) |
| 407 | priority = priority_min; |
| 408 | params.sched_priority = priority; |
| 409 | |
| 410 | /* |
| 411 | * The solaris 7 and several other man pages incorrectly state that |
| 412 | * this should be a pointer to policy but pthread.h is universally |
| 413 | * at odds with this. |
| 414 | */ |
| 415 | if (__gthrw_(pthread_setschedparam) (thread_id, policy, ¶ms) == 0) |
| 416 | return 0; |
| 417 | } |
| 418 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
| 419 | #endif /* _POSIX_PRIORITY_SCHEDULING */ |
| 420 | return -1; |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | /* Return the current thread's priority. */ |
| 425 | static inline int |
| 426 | __gthread_objc_thread_get_priority (void) |
| 427 | { |
| 428 | #ifdef _POSIX_PRIORITY_SCHEDULING |
| 429 | #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
| 430 | if (__gthread_active_p ()) |
| 431 | { |
| 432 | int policy; |
| 433 | struct sched_param params; |
| 434 | |
| 435 | if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, ¶ms) == 0) |
| 436 | return params.sched_priority; |
| 437 | else |
| 438 | return -1; |
| 439 | } |
| 440 | else |
| 441 | #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ |
| 442 | #endif /* _POSIX_PRIORITY_SCHEDULING */ |
| 443 | return OBJC_THREAD_INTERACTIVE_PRIORITY; |
| 444 | } |
| 445 | |
| 446 | /* Yield our process time to another thread. */ |
| 447 | static inline void |
| 448 | __gthread_objc_thread_yield (void) |
| 449 | { |
| 450 | if (__gthread_active_p ()) |
| 451 | __gthrw_(sched_yield) (); |
| 452 | } |
| 453 | |
| 454 | /* Terminate the current thread. */ |
| 455 | static inline int |
| 456 | __gthread_objc_thread_exit (void) |
| 457 | { |
| 458 | if (__gthread_active_p ()) |
| 459 | /* exit the thread */ |
| 460 | __gthrw_(pthread_exit) (&__objc_thread_exit_status); |
| 461 | |
| 462 | /* Failed if we reached here */ |
| 463 | return -1; |
| 464 | } |
| 465 | |
| 466 | /* Returns an integer value which uniquely describes a thread. */ |
| 467 | static inline objc_thread_t |
| 468 | __gthread_objc_thread_id (void) |
| 469 | { |
| 470 | if (__gthread_active_p ()) |
| 471 | return (objc_thread_t) __gthrw_(pthread_self) (); |
| 472 | else |
| 473 | return (objc_thread_t) 1; |
| 474 | } |
| 475 | |
| 476 | /* Sets the thread's local storage pointer. */ |
| 477 | static inline int |
| 478 | __gthread_objc_thread_set_data (void *value) |
| 479 | { |
| 480 | if (__gthread_active_p ()) |
| 481 | return __gthrw_(pthread_setspecific) (_objc_thread_storage, value); |
| 482 | else |
| 483 | { |
| 484 | thread_local_storage = value; |
| 485 | return 0; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | /* Returns the thread's local storage pointer. */ |
| 490 | static inline void * |
| 491 | __gthread_objc_thread_get_data (void) |
| 492 | { |
| 493 | if (__gthread_active_p ()) |
| 494 | return __gthrw_(pthread_getspecific) (_objc_thread_storage); |
| 495 | else |
| 496 | return thread_local_storage; |
| 497 | } |
| 498 | |
| 499 | /* Backend mutex functions */ |
| 500 | |
| 501 | /* Allocate a mutex. */ |
| 502 | static inline int |
| 503 | __gthread_objc_mutex_allocate (objc_mutex_t mutex) |
| 504 | { |
| 505 | if (__gthread_active_p ()) |
| 506 | { |
| 507 | mutex->backend = objc_malloc (sizeof (pthread_mutex_t)); |
| 508 | |
| 509 | if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend, NULL)) |
| 510 | { |
| 511 | objc_free (mutex->backend); |
| 512 | mutex->backend = NULL; |
| 513 | return -1; |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | /* Deallocate a mutex. */ |
| 521 | static inline int |
| 522 | __gthread_objc_mutex_deallocate (objc_mutex_t mutex) |
| 523 | { |
| 524 | if (__gthread_active_p ()) |
| 525 | { |
| 526 | int count; |
| 527 | |
| 528 | /* |
| 529 | * Posix Threads specifically require that the thread be unlocked |
| 530 | * for __gthrw_(pthread_mutex_destroy) to work. |
| 531 | */ |
| 532 | |
| 533 | do |
| 534 | { |
| 535 | count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend); |
| 536 | if (count < 0) |
| 537 | return -1; |
| 538 | } |
| 539 | while (count); |
| 540 | |
| 541 | if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend)) |
| 542 | return -1; |
| 543 | |
| 544 | objc_free (mutex->backend); |
| 545 | mutex->backend = NULL; |
| 546 | } |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /* Grab a lock on a mutex. */ |
| 551 | static inline int |
| 552 | __gthread_objc_mutex_lock (objc_mutex_t mutex) |
| 553 | { |
| 554 | if (__gthread_active_p () |
| 555 | && __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend) != 0) |
| 556 | { |
| 557 | return -1; |
| 558 | } |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | /* Try to grab a lock on a mutex. */ |
| 564 | static inline int |
| 565 | __gthread_objc_mutex_trylock (objc_mutex_t mutex) |
| 566 | { |
| 567 | if (__gthread_active_p () |
| 568 | && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 0) |
| 569 | { |
| 570 | return -1; |
| 571 | } |
| 572 | |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | /* Unlock the mutex */ |
| 577 | static inline int |
| 578 | __gthread_objc_mutex_unlock (objc_mutex_t mutex) |
| 579 | { |
| 580 | if (__gthread_active_p () |
| 581 | && __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend) != 0) |
| 582 | { |
| 583 | return -1; |
| 584 | } |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | /* Backend condition mutex functions */ |
| 590 | |
| 591 | /* Allocate a condition. */ |
| 592 | static inline int |
| 593 | __gthread_objc_condition_allocate (objc_condition_t condition) |
| 594 | { |
| 595 | if (__gthread_active_p ()) |
| 596 | { |
| 597 | condition->backend = objc_malloc (sizeof (pthread_cond_t)); |
| 598 | |
| 599 | if (__gthrw_(pthread_cond_init) ((pthread_cond_t *) condition->backend, NULL)) |
| 600 | { |
| 601 | objc_free (condition->backend); |
| 602 | condition->backend = NULL; |
| 603 | return -1; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | /* Deallocate a condition. */ |
| 611 | static inline int |
| 612 | __gthread_objc_condition_deallocate (objc_condition_t condition) |
| 613 | { |
| 614 | if (__gthread_active_p ()) |
| 615 | { |
| 616 | if (__gthrw_(pthread_cond_destroy) ((pthread_cond_t *) condition->backend)) |
| 617 | return -1; |
| 618 | |
| 619 | objc_free (condition->backend); |
| 620 | condition->backend = NULL; |
| 621 | } |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | /* Wait on the condition */ |
| 626 | static inline int |
| 627 | __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) |
| 628 | { |
| 629 | if (__gthread_active_p ()) |
| 630 | return __gthrw_(pthread_cond_wait) ((pthread_cond_t *) condition->backend, |
| 631 | (pthread_mutex_t *) mutex->backend); |
| 632 | else |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | /* Wake up all threads waiting on this condition. */ |
| 637 | static inline int |
| 638 | __gthread_objc_condition_broadcast (objc_condition_t condition) |
| 639 | { |
| 640 | if (__gthread_active_p ()) |
| 641 | return __gthrw_(pthread_cond_broadcast) ((pthread_cond_t *) condition->backend); |
| 642 | else |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | /* Wake up one thread waiting on this condition. */ |
| 647 | static inline int |
| 648 | __gthread_objc_condition_signal (objc_condition_t condition) |
| 649 | { |
| 650 | if (__gthread_active_p ()) |
| 651 | return __gthrw_(pthread_cond_signal) ((pthread_cond_t *) condition->backend); |
| 652 | else |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | #else /* _LIBOBJC */ |
| 657 | |
| 658 | static inline int |
| 659 | __gthread_create (__gthread_t *__threadid, void *(*__func) (void*), |
| 660 | void *__args) |
| 661 | { |
| 662 | return __gthrw_(pthread_create) (__threadid, NULL, __func, __args); |
| 663 | } |
| 664 | |
| 665 | static inline int |
| 666 | __gthread_join (__gthread_t __threadid, void **__value_ptr) |
| 667 | { |
| 668 | return __gthrw_(pthread_join) (__threadid, __value_ptr); |
| 669 | } |
| 670 | |
| 671 | static inline int |
| 672 | __gthread_detach (__gthread_t __threadid) |
| 673 | { |
| 674 | return __gthrw_(pthread_detach) (__threadid); |
| 675 | } |
| 676 | |
| 677 | static inline int |
| 678 | __gthread_equal (__gthread_t __t1, __gthread_t __t2) |
| 679 | { |
| 680 | return __gthrw_(pthread_equal) (__t1, __t2); |
| 681 | } |
| 682 | |
| 683 | static inline __gthread_t |
| 684 | __gthread_self (void) |
| 685 | { |
| 686 | return __gthrw_(pthread_self) (); |
| 687 | } |
| 688 | |
| 689 | static inline int |
| 690 | __gthread_yield (void) |
| 691 | { |
| 692 | return __gthrw_(sched_yield) (); |
| 693 | } |
| 694 | |
| 695 | static inline int |
| 696 | __gthread_once (__gthread_once_t *__once, void (*__func) (void)) |
| 697 | { |
| 698 | if (__gthread_active_p ()) |
| 699 | return __gthrw_(pthread_once) (__once, __func); |
| 700 | else |
| 701 | return -1; |
| 702 | } |
| 703 | |
| 704 | static inline int |
| 705 | __gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *)) |
| 706 | { |
| 707 | return __gthrw_(pthread_key_create) (__key, __dtor); |
| 708 | } |
| 709 | |
| 710 | static inline int |
| 711 | __gthread_key_delete (__gthread_key_t __key) |
| 712 | { |
| 713 | return __gthrw_(pthread_key_delete) (__key); |
| 714 | } |
| 715 | |
| 716 | static inline void * |
| 717 | __gthread_getspecific (__gthread_key_t __key) |
| 718 | { |
| 719 | return __gthrw_(pthread_getspecific) (__key); |
| 720 | } |
| 721 | |
| 722 | static inline int |
| 723 | __gthread_setspecific (__gthread_key_t __key, const void *__ptr) |
| 724 | { |
| 725 | return __gthrw_(pthread_setspecific) (__key, __ptr); |
| 726 | } |
| 727 | |
| 728 | static inline void |
| 729 | __gthread_mutex_init_function (__gthread_mutex_t *__mutex) |
| 730 | { |
| 731 | if (__gthread_active_p ()) |
| 732 | __gthrw_(pthread_mutex_init) (__mutex, NULL); |
| 733 | } |
| 734 | |
| 735 | static inline int |
| 736 | __gthread_mutex_destroy (__gthread_mutex_t *__mutex) |
| 737 | { |
| 738 | if (__gthread_active_p ()) |
| 739 | return __gthrw_(pthread_mutex_destroy) (__mutex); |
| 740 | else |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | static inline int |
| 745 | __gthread_mutex_lock (__gthread_mutex_t *__mutex) |
| 746 | { |
| 747 | if (__gthread_active_p ()) |
| 748 | return __gthrw_(pthread_mutex_lock) (__mutex); |
| 749 | else |
| 750 | return 0; |
| 751 | } |
| 752 | |
| 753 | static inline int |
| 754 | __gthread_mutex_trylock (__gthread_mutex_t *__mutex) |
| 755 | { |
| 756 | if (__gthread_active_p ()) |
| 757 | return __gthrw_(pthread_mutex_trylock) (__mutex); |
| 758 | else |
| 759 | return 0; |
| 760 | } |
| 761 | |
| 762 | #if _GTHREAD_USE_MUTEX_TIMEDLOCK |
| 763 | static inline int |
| 764 | __gthread_mutex_timedlock (__gthread_mutex_t *__mutex, |
| 765 | const __gthread_time_t *__abs_timeout) |
| 766 | { |
| 767 | if (__gthread_active_p ()) |
| 768 | return __gthrw_(pthread_mutex_timedlock) (__mutex, __abs_timeout); |
| 769 | else |
| 770 | return 0; |
| 771 | } |
| 772 | #endif |
| 773 | |
| 774 | static inline int |
| 775 | __gthread_mutex_unlock (__gthread_mutex_t *__mutex) |
| 776 | { |
| 777 | if (__gthread_active_p ()) |
| 778 | return __gthrw_(pthread_mutex_unlock) (__mutex); |
| 779 | else |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | #if !defined( PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP) \ |
| 784 | || defined(_GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC) |
| 785 | static inline int |
| 786 | __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex) |
| 787 | { |
| 788 | if (__gthread_active_p ()) |
| 789 | { |
| 790 | pthread_mutexattr_t __attr; |
| 791 | int __r; |
| 792 | |
| 793 | __r = __gthrw_(pthread_mutexattr_init) (&__attr); |
| 794 | if (!__r) |
| 795 | __r = __gthrw_(pthread_mutexattr_settype) (&__attr, |
| 796 | PTHREAD_MUTEX_RECURSIVE); |
| 797 | if (!__r) |
| 798 | __r = __gthrw_(pthread_mutex_init) (__mutex, &__attr); |
| 799 | if (!__r) |
| 800 | __r = __gthrw_(pthread_mutexattr_destroy) (&__attr); |
| 801 | return __r; |
| 802 | } |
| 803 | return 0; |
| 804 | } |
| 805 | #endif |
| 806 | |
| 807 | static inline int |
| 808 | __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex) |
| 809 | { |
| 810 | return __gthread_mutex_lock (__mutex); |
| 811 | } |
| 812 | |
| 813 | static inline int |
| 814 | __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex) |
| 815 | { |
| 816 | return __gthread_mutex_trylock (__mutex); |
| 817 | } |
| 818 | |
| 819 | #if _GTHREAD_USE_MUTEX_TIMEDLOCK |
| 820 | static inline int |
| 821 | __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex, |
| 822 | const __gthread_time_t *__abs_timeout) |
| 823 | { |
| 824 | return __gthread_mutex_timedlock (__mutex, __abs_timeout); |
| 825 | } |
| 826 | #endif |
| 827 | |
| 828 | static inline int |
| 829 | __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex) |
| 830 | { |
| 831 | return __gthread_mutex_unlock (__mutex); |
| 832 | } |
| 833 | |
| 834 | static inline int |
| 835 | __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex) |
| 836 | { |
| 837 | return __gthread_mutex_destroy (__mutex); |
| 838 | } |
| 839 | |
| 840 | #ifdef _GTHREAD_USE_COND_INIT_FUNC |
| 841 | static inline void |
| 842 | __gthread_cond_init_function (__gthread_cond_t *__cond) |
| 843 | { |
| 844 | if (__gthread_active_p ()) |
| 845 | __gthrw_(pthread_cond_init) (__cond, NULL); |
| 846 | } |
| 847 | #endif |
| 848 | |
| 849 | static inline int |
| 850 | __gthread_cond_broadcast (__gthread_cond_t *__cond) |
| 851 | { |
| 852 | return __gthrw_(pthread_cond_broadcast) (__cond); |
| 853 | } |
| 854 | |
| 855 | static inline int |
| 856 | __gthread_cond_signal (__gthread_cond_t *__cond) |
| 857 | { |
| 858 | return __gthrw_(pthread_cond_signal) (__cond); |
| 859 | } |
| 860 | |
| 861 | static inline int |
| 862 | __gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex) |
| 863 | { |
| 864 | return __gthrw_(pthread_cond_wait) (__cond, __mutex); |
| 865 | } |
| 866 | |
| 867 | static inline int |
| 868 | __gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex, |
| 869 | const __gthread_time_t *__abs_timeout) |
| 870 | { |
| 871 | return __gthrw_(pthread_cond_timedwait) (__cond, __mutex, __abs_timeout); |
| 872 | } |
| 873 | |
| 874 | static inline int |
| 875 | __gthread_cond_wait_recursive (__gthread_cond_t *__cond, |
| 876 | __gthread_recursive_mutex_t *__mutex) |
| 877 | { |
| 878 | return __gthread_cond_wait (__cond, __mutex); |
| 879 | } |
| 880 | |
| 881 | static inline int |
| 882 | __gthread_cond_destroy (__gthread_cond_t* __cond) |
| 883 | { |
| 884 | return __gthrw_(pthread_cond_destroy) (__cond); |
| 885 | } |
| 886 | |
| 887 | #endif /* _LIBOBJC */ |
| 888 | |
| 889 | #endif /* ! _GLIBCXX_GCC_GTHR_POSIX_H */ |