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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 | /* * Copyright (c) 2000-2003, 2007, 2008 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991 * All Rights Reserved * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appears in all copies and * that both the copyright notice and this permission notice appear in * supporting documentation. * * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. * * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * MkLinux */ /* * POSIX Pthread Library */ #include "pthread_internals.h" #include <sys/time.h> /* For struct timespec and getclock(). */ #include <stdio.h> #ifdef PLOCKSTAT #include "plockstat.h" #else /* !PLOCKSTAT */ #define PLOCKSTAT_MUTEX_RELEASE(x, y) #endif /* PLOCKSTAT */ extern int __semwait_signal(int, int, int, int, int64_t, int32_t); extern int _pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *, int); extern int __unix_conforming; #ifdef PR_5243343 /* 5243343 - temporary hack to detect if we are running the conformance test */ extern int PR_5243343_flag; #endif /* PR_5243343 */ #if defined(__i386__) || defined(__x86_64__) __private_extern__ int __new_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime, int isRelative, int isconforming); extern int _new_pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *, int); extern int _new_pthread_cond_destroy(pthread_cond_t *); extern int _new_pthread_cond_destroy_locked(pthread_cond_t *); int _new_pthread_cond_broadcast(pthread_cond_t *cond); int _new_pthread_cond_signal_thread_np(pthread_cond_t *cond, pthread_t thread); int _new_pthread_cond_signal(pthread_cond_t *cond); int _new_pthread_cond_timedwait_relative_np(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime); int _new_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex); int _new_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime); static void _new_cond_cleanup(void *arg); static void _new_cond_dropwait(npthread_cond_t * cond); #if defined(__LP64__) #define COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt) \ { \ if (cond->misalign != 0) { \ c_lseqcnt = &cond->c_seq[1]; \ c_useqcnt = &cond->c_seq[2]; \ } else { \ /* aligned */ \ c_lseqcnt = &cond->c_seq[0]; \ c_useqcnt = &cond->c_seq[1]; \ } \ } #else /* __LP64__ */ #define COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt) \ { \ if (cond->misalign != 0) { \ c_lseqcnt = &cond->c_seq[1]; \ c_useqcnt = &cond->c_seq[2]; \ } else { \ /* aligned */ \ c_lseqcnt = &cond->c_seq[0]; \ c_useqcnt = &cond->c_seq[1]; \ } \ } #endif /* __LP64__ */ #define _KSYN_TRACE_ 0 #if _KSYN_TRACE_ /* The Function qualifiers */ #define DBG_FUNC_START 1 #define DBG_FUNC_END 2 #define DBG_FUNC_NONE 0 int __kdebug_trace(uint32_t, uint32_t, uint32_t, uint32_t, uint32_t, uint32_t); #define _KSYN_TRACE_UM_LOCK 0x9000060 #define _KSYN_TRACE_UM_UNLOCK 0x9000064 #define _KSYN_TRACE_UM_MHOLD 0x9000068 #define _KSYN_TRACE_UM_MDROP 0x900006c #define _KSYN_TRACE_UM_CVWAIT 0x9000070 #define _KSYN_TRACE_UM_CVSIG 0x9000074 #define _KSYN_TRACE_UM_CVBRD 0x9000078 #endif /* _KSYN_TRACE_ */ #endif /* __i386__ || __x86_64__ */ #ifndef BUILDING_VARIANT /* [ */ /* * Destroy a condition variable. */ int pthread_cond_destroy(pthread_cond_t *cond) { int ret; int sig = cond->sig; /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); LOCK(cond->lock); if (cond->sig == _PTHREAD_COND_SIG) { #if defined(__i386__) || defined(__x86_64__) if (cond->pshared == PTHREAD_PROCESS_SHARED) { ret = _new_pthread_cond_destroy_locked(cond); UNLOCK(cond->lock); return(ret); } #endif /* __i386__ || __x86_64__ */ if (cond->busy == (pthread_mutex_t *)NULL) { cond->sig = _PTHREAD_NO_SIG; ret = 0; } else ret = EBUSY; } else ret = EINVAL; /* Not an initialized condition variable structure */ UNLOCK(cond->lock); return (ret); } /* * Signal a condition variable, waking up all threads waiting for it. */ int pthread_cond_broadcast(pthread_cond_t *cond) { kern_return_t kern_res; semaphore_t sem; int sig = cond->sig; /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); LOCK(cond->lock); if (cond->sig != _PTHREAD_COND_SIG) { int res; if (cond->sig == _PTHREAD_COND_SIG_init) { _pthread_cond_init(cond, NULL, 0); res = 0; } else res = EINVAL; /* Not a condition variable */ UNLOCK(cond->lock); return (res); } #if defined(__i386__) || defined(__x86_64__) else if (cond->pshared == PTHREAD_PROCESS_SHARED) { UNLOCK(cond->lock); return(_new_pthread_cond_broadcast(cond)); } #endif /* __i386__ || __x86_64__ */ else if ((sem = cond->sem) == SEMAPHORE_NULL) { /* Avoid kernel call since there are no waiters... */ UNLOCK(cond->lock); return (0); } cond->sigspending++; UNLOCK(cond->lock); PTHREAD_MACH_CALL(semaphore_signal_all(sem), kern_res); LOCK(cond->lock); cond->sigspending--; if (cond->waiters == 0 && cond->sigspending == 0) { cond->sem = SEMAPHORE_NULL; restore_sem_to_pool(sem); } UNLOCK(cond->lock); if (kern_res != KERN_SUCCESS) return (EINVAL); return (0); } /* * Signal a condition variable, waking a specified thread. */ int pthread_cond_signal_thread_np(pthread_cond_t *cond, pthread_t thread) { kern_return_t kern_res; semaphore_t sem; int sig = cond->sig; /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); LOCK(cond->lock); if (cond->sig != _PTHREAD_COND_SIG) { int ret; if (cond->sig == _PTHREAD_COND_SIG_init) { _pthread_cond_init(cond, NULL, 0); ret = 0; } else ret = EINVAL; /* Not a condition variable */ UNLOCK(cond->lock); return (ret); } #if defined(__i386__) || defined(__x86_64__) else if (cond->pshared == PTHREAD_PROCESS_SHARED) { UNLOCK(cond->lock); return(_new_pthread_cond_signal_thread_np(cond, thread)); } #endif /* __i386__ || __x86_64__ */ else if ((sem = cond->sem) == SEMAPHORE_NULL) { /* Avoid kernel call since there are not enough waiters... */ UNLOCK(cond->lock); return (0); } cond->sigspending++; UNLOCK(cond->lock); if (thread == (pthread_t)NULL) { kern_res = semaphore_signal_thread(sem, THREAD_NULL); if (kern_res == KERN_NOT_WAITING) kern_res = KERN_SUCCESS; } else if (thread->sig == _PTHREAD_SIG) { PTHREAD_MACH_CALL(semaphore_signal_thread( sem, pthread_mach_thread_np(thread)), kern_res); } else kern_res = KERN_FAILURE; LOCK(cond->lock); cond->sigspending--; if (cond->waiters == 0 && cond->sigspending == 0) { cond->sem = SEMAPHORE_NULL; restore_sem_to_pool(sem); } UNLOCK(cond->lock); if (kern_res != KERN_SUCCESS) return (EINVAL); return (0); } /* * Signal a condition variable, waking only one thread. */ int pthread_cond_signal(pthread_cond_t *cond) { return pthread_cond_signal_thread_np(cond, NULL); } /* * Manage a list of condition variables associated with a mutex */ static void _pthread_cond_add(pthread_cond_t *cond, pthread_mutex_t *mutex) { pthread_cond_t *c; LOCK(mutex->lock); if ((c = mutex->busy) != (pthread_cond_t *)NULL) { c->prev = cond; } cond->next = c; cond->prev = (pthread_cond_t *)NULL; mutex->busy = cond; UNLOCK(mutex->lock); if (cond->sem == SEMAPHORE_NULL) cond->sem = new_sem_from_pool(); } static void _pthread_cond_remove(pthread_cond_t *cond, pthread_mutex_t *mutex) { pthread_cond_t *n, *p; LOCK(mutex->lock); if ((n = cond->next) != (pthread_cond_t *)NULL) { n->prev = cond->prev; } if ((p = cond->prev) != (pthread_cond_t *)NULL) { p->next = cond->next; } else { /* This is the first in the list */ mutex->busy = n; } UNLOCK(mutex->lock); if (cond->sigspending == 0) { restore_sem_to_pool(cond->sem); cond->sem = SEMAPHORE_NULL; } } static void cond_cleanup(void *arg) { pthread_cond_t *cond = (pthread_cond_t *)arg; pthread_mutex_t *mutex; // 4597450: begin pthread_t thread = pthread_self(); int thcanceled = 0; LOCK(thread->lock); thcanceled = (thread->detached & _PTHREAD_WASCANCEL); UNLOCK(thread->lock); if (thcanceled == 0) return; // 4597450: end LOCK(cond->lock); mutex = cond->busy; cond->waiters--; if (cond->waiters == 0) { _pthread_cond_remove(cond, mutex); cond->busy = (pthread_mutex_t *)NULL; } UNLOCK(cond->lock); /* ** Can't do anything if this fails -- we're on the way out */ (void)pthread_mutex_lock(mutex); } /* * Suspend waiting for a condition variable. * Note: we have to keep a list of condition variables which are using * this same mutex variable so we can detect invalid 'destroy' sequences. * If isconforming < 0, we skip the _pthread_testcancel(), but keep the * remaining conforming behavior.. */ __private_extern__ int _pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime, int isRelative, int isconforming) { int res; kern_return_t kern_res = KERN_SUCCESS; int wait_res = 0; pthread_mutex_t *busy; mach_timespec_t then = {0, 0}; struct timespec cthen = {0,0}; int sig = cond->sig; int msig = mutex->sig; extern void _pthread_testcancel(pthread_t thread, int isconforming); /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); if (isconforming) { if((msig != _PTHREAD_MUTEX_SIG) && (msig != _PTHREAD_MUTEX_SIG_init)) return(EINVAL); if (isconforming > 0) _pthread_testcancel(pthread_self(), 1); } LOCK(cond->lock); if (cond->sig != _PTHREAD_COND_SIG) { if (cond->sig != _PTHREAD_COND_SIG_init) { UNLOCK(cond->lock); return (EINVAL); /* Not a condition variable */ } _pthread_cond_init(cond, NULL, 0); } #if defined(__i386__) || defined(__x86_64__) else if (cond->pshared == PTHREAD_PROCESS_SHARED) { UNLOCK(cond->lock); return(__new_pthread_cond_wait(cond, mutex, abstime, isRelative, isconforming)); } #endif /* __i386__ || __x86_64__ */ if (abstime) { if (!isconforming) { if (isRelative == 0) { struct timespec now; struct timeval tv; gettimeofday(&tv, NULL); TIMEVAL_TO_TIMESPEC(&tv, &now); /* Compute relative time to sleep */ then.tv_nsec = abstime->tv_nsec - now.tv_nsec; then.tv_sec = abstime->tv_sec - now.tv_sec; if (then.tv_nsec < 0) { then.tv_nsec += NSEC_PER_SEC; then.tv_sec--; } if (((int)then.tv_sec < 0) || ((then.tv_sec == 0) && (then.tv_nsec == 0))) { UNLOCK(cond->lock); return ETIMEDOUT; } } else { then.tv_sec = abstime->tv_sec; then.tv_nsec = abstime->tv_nsec; } if (then.tv_nsec >= NSEC_PER_SEC) { UNLOCK(cond->lock); return EINVAL; } } else { if (isRelative == 0) { /* preflight the checks for failures */ struct timespec now; struct timeval tv; gettimeofday(&tv, NULL); TIMEVAL_TO_TIMESPEC(&tv, &now); /* Compute relative time to sleep */ then.tv_nsec = abstime->tv_nsec - now.tv_nsec; then.tv_sec = abstime->tv_sec - now.tv_sec; if (then.tv_nsec < 0) { then.tv_nsec += NSEC_PER_SEC; then.tv_sec--; } if (((int)then.tv_sec < 0) || ((then.tv_sec == 0) && (then.tv_nsec == 0))) { UNLOCK(cond->lock); return ETIMEDOUT; } if (then.tv_nsec >= NSEC_PER_SEC) { UNLOCK(cond->lock); return EINVAL; } } /* we can cleanup this code and pass the calculated time * to the kernel. But kernel is going to do the same. TILL * we change the kernel do this anyway */ cthen.tv_sec = abstime->tv_sec; cthen.tv_nsec = abstime->tv_nsec; if ((cthen.tv_sec < 0) || (cthen.tv_nsec < 0)) { UNLOCK(cond->lock); return EINVAL; } if (cthen.tv_nsec >= NSEC_PER_SEC) { UNLOCK(cond->lock); return EINVAL; } } } if (++cond->waiters == 1) { _pthread_cond_add(cond, mutex); cond->busy = mutex; } else if ((busy = cond->busy) != mutex) { /* Must always specify the same mutex! */ cond->waiters--; UNLOCK(cond->lock); return (EINVAL); } UNLOCK(cond->lock); LOCK(mutex->lock); if (--mutex->mtxopts.options.lock_count == 0) { PLOCKSTAT_MUTEX_RELEASE(mutex, (mutex->mtxopts.options.type == PTHREAD_MUTEX_RECURSIVE)? 1:0); if (mutex->sem == SEMAPHORE_NULL) mutex->sem = new_sem_from_pool(); mutex->owner = _PTHREAD_MUTEX_OWNER_SWITCHING; UNLOCK(mutex->lock); if (!isconforming) { if (abstime) { kern_res = semaphore_timedwait_signal(cond->sem, mutex->sem, then); } else { PTHREAD_MACH_CALL(semaphore_wait_signal(cond->sem, mutex->sem), kern_res); } } else { pthread_cleanup_push(cond_cleanup, (void *)cond); wait_res = __semwait_signal(cond->sem, mutex->sem, abstime != NULL, isRelative, (int64_t)cthen.tv_sec, (int32_t)cthen.tv_nsec); pthread_cleanup_pop(0); } } else { PLOCKSTAT_MUTEX_RELEASE(mutex, (mutex->mtxopts.options.type == PTHREAD_MUTEX_RECURSIVE)? 1:0); UNLOCK(mutex->lock); if (!isconforming) { if (abstime) { kern_res = semaphore_timedwait(cond->sem, then); } else { PTHREAD_MACH_CALL(semaphore_wait(cond->sem), kern_res); } } else { pthread_cleanup_push(cond_cleanup, (void *)cond); wait_res = __semwait_signal(cond->sem, 0, abstime != NULL, isRelative, (int64_t)cthen.tv_sec, (int32_t)cthen.tv_nsec); pthread_cleanup_pop(0); } } LOCK(cond->lock); cond->waiters--; if (cond->waiters == 0) { _pthread_cond_remove(cond, mutex); cond->busy = (pthread_mutex_t *)NULL; } UNLOCK(cond->lock); if ((res = pthread_mutex_lock(mutex)) != 0) return (res); if (!isconforming) { /* KERN_ABORTED can be treated as a spurious wakeup */ if ((kern_res == KERN_SUCCESS) || (kern_res == KERN_ABORTED)) return (0); else if (kern_res == KERN_OPERATION_TIMED_OUT) return (ETIMEDOUT); return (EINVAL); } else { if (wait_res < 0) { if (errno == ETIMEDOUT) { return ETIMEDOUT; } else if (errno == EINTR) { /* ** EINTR can be treated as a spurious wakeup unless we were canceled. */ return 0; } return EINVAL; } return 0; } } int pthread_cond_timedwait_relative_np(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) { return (_pthread_cond_wait(cond, mutex, abstime, 1, 0)); } int pthread_condattr_init(pthread_condattr_t *attr) { attr->sig = _PTHREAD_COND_ATTR_SIG; attr->pshared = _PTHREAD_DEFAULT_PSHARED; return (0); } int pthread_condattr_destroy(pthread_condattr_t *attr) { attr->sig = _PTHREAD_NO_SIG; /* Uninitialized */ return (0); } int pthread_condattr_getpshared(const pthread_condattr_t *attr, int *pshared) { if (attr->sig == _PTHREAD_COND_ATTR_SIG) { *pshared = (int)attr->pshared; return (0); } else { return (EINVAL); /* Not an initialized 'attribute' structure */ } } __private_extern__ int _pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr, int conforming) { cond->next = (pthread_cond_t *)NULL; cond->prev = (pthread_cond_t *)NULL; cond->busy = (pthread_mutex_t *)NULL; cond->waiters = 0; cond->sigspending = 0; if (conforming) { if (attr) cond->pshared = attr->pshared; else cond->pshared = _PTHREAD_DEFAULT_PSHARED; } else cond->pshared = _PTHREAD_DEFAULT_PSHARED; cond->sem = SEMAPHORE_NULL; cond->sig = _PTHREAD_COND_SIG; return (0); } /* temp home till pshared is fixed correctly */ int pthread_condattr_setpshared(pthread_condattr_t * attr, int pshared) { if (attr->sig == _PTHREAD_COND_ATTR_SIG) { #if __DARWIN_UNIX03 #ifdef PR_5243343 if (( pshared == PTHREAD_PROCESS_PRIVATE) || (pshared == PTHREAD_PROCESS_SHARED && PR_5243343_flag)) #else /* !PR_5243343 */ if (( pshared == PTHREAD_PROCESS_PRIVATE) || (pshared == PTHREAD_PROCESS_SHARED)) #endif /* PR_5243343 */ #else /* __DARWIN_UNIX03 */ if ( pshared == PTHREAD_PROCESS_PRIVATE) #endif /* __DARWIN_UNIX03 */ { attr->pshared = pshared; return (0); } else { return (EINVAL); /* Invalid parameter */ } } else { return (EINVAL); /* Not an initialized 'attribute' structure */ } } #if defined(__i386__) || defined(__x86_64__) __private_extern__ int _new_pthread_cond_init(pthread_cond_t *ocond, const pthread_condattr_t *attr, int conforming) { npthread_cond_t * cond = (npthread_cond_t *)ocond; cond->busy = (npthread_mutex_t *)NULL; cond->c_seq[0] = 0; cond->c_seq[1] = 0; cond->c_seq[2] = 0; cond->rfu = 0; if (((uintptr_t)cond & 0x07) != 0) { cond->misalign = 1; } else { cond->misalign = 0; } if (conforming) { if (attr) cond->pshared = attr->pshared; else cond->pshared = _PTHREAD_DEFAULT_PSHARED; } else cond->pshared = _PTHREAD_DEFAULT_PSHARED; cond->sig = _PTHREAD_COND_SIG; return (0); } int _new_pthread_cond_destroy(pthread_cond_t * ocond) { npthread_cond_t *cond = (npthread_cond_t *)ocond; int ret; LOCK(cond->lock); ret = _new_pthread_cond_destroy_locked(ocond); UNLOCK(cond->lock); return(ret); } int _new_pthread_cond_destroy_locked(pthread_cond_t * ocond) { npthread_cond_t *cond = (npthread_cond_t *)ocond; int ret; int sig = cond->sig; uint32_t * c_lseqcnt; uint32_t * c_useqcnt; uint32_t lgenval , ugenval; /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); if (cond->sig == _PTHREAD_COND_SIG) { COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt); retry: lgenval = *c_lseqcnt; ugenval = *c_useqcnt; if (lgenval == ugenval) { cond->sig = _PTHREAD_NO_SIG; ret = 0; } else ret = EBUSY; } else ret = EINVAL; /* Not an initialized condition variable structure */ return (ret); } /* * Signal a condition variable, waking up all threads waiting for it. */ int _new_pthread_cond_broadcast(pthread_cond_t *ocond) { npthread_cond_t * cond = (npthread_cond_t *)ocond; int sig = cond->sig; npthread_mutex_t * mutex; uint32_t lgenval, ugenval, mgen, ugen, flags, mtxgen, mtxugen, notify; int diffgen, retval, dropcount, mutexrefs; uint64_t oldval64, newval64; uint32_t * c_lseqcnt; uint32_t * c_useqcnt; uint32_t * pmtx = NULL; /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); if (sig != _PTHREAD_COND_SIG) { int res; LOCK(cond->lock); if (cond->sig == _PTHREAD_COND_SIG_init) { _new_pthread_cond_init(ocond, NULL, 0); res = 0; } else if (cond->sig != _PTHREAD_COND_SIG) { res = EINVAL; /* Not a condition variable */ UNLOCK(cond->lock); return (res); } UNLOCK(cond->lock); } #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVBRD | DBG_FUNC_START, (uint32_t)cond, 0, 0, 0, 0); #endif COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt); retry: lgenval = *c_lseqcnt; ugenval = *c_useqcnt; diffgen = lgenval - ugenval; /* pendig waiters */ if (diffgen <= 0) { return(0); #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVBRD | DBG_FUNC_END, (uint32_t)cond, 0, 0, 0, 0); #endif } mutex = cond->busy; if (OSAtomicCompareAndSwap32(ugenval, ugenval+diffgen, (volatile int *)c_useqcnt) != TRUE) goto retry; #ifdef COND_MTX_WAITQUEUEMOVE if ((mutex != NULL) && cond->pshared != PTHREAD_PROCESS_SHARED) { #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVBRD | DBG_FUNC_NONE, (uint32_t)cond, 1, diffgen, 0, 0); #endif (void)__mtx_holdlock(mutex, diffgen, &flags, &pmtx, &mgen, &ugen); mutexrefs = 1; } else { if (cond->pshared != PTHREAD_PROCESS_SHARED) flags = _PTHREAD_MTX_OPT_NOHOLD; else flags = _PTHREAD_MTX_OPT_NOHOLD | _PTHREAD_MTX_OPT_PSHARED; mgen = ugen = 0; mutexrefs = 0; pmtx = NULL; } #else /* COND_MTX_WAITQUEUEMOVE */ if (cond->pshared != PTHREAD_PROCESS_SHARED) flags = _PTHREAD_MTX_OPT_NOHOLD; else flags = _PTHREAD_MTX_OPT_NOHOLD | _PTHREAD_MTX_OPT_PSHARED; pmtx = NULL; mgen = ugen = 0; mutexrefs = 0; #endif /* COND_MTX_WAITQUEUEMOVE */ #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVBRD | DBG_FUNC_NONE, (uint32_t)cond, 3, diffgen, 0, 0); #endif retval = __psynch_cvbroad(ocond, lgenval, diffgen, (pthread_mutex_t *)pmtx, mgen, ugen , (uint64_t)0, flags); #ifdef COND_MTX_WAITQUEUEMOVE if ((retval != -1) && (retval != 0)) { if ((mutexrefs != 0) && (retval <= PTHRW_MAX_READERS/2)) { dropcount = (retval); #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVBRD | DBG_FUNC_NONE, (uint32_t)cond, 2, dropcount, 0, 0); #endif retval = __mtx_droplock(mutex, dropcount, &flags, &pmtx, &mtxgen, &mtxugen, ¬ify); } } #endif /* COND_MTX_WAITQUEUEMOVE */ oldval64 = (((uint64_t)(ugenval+diffgen)) << 32); oldval64 |= lgenval; newval64 = 0; OSAtomicCompareAndSwap64(oldval64, newval64, (volatile int64_t *)c_lseqcnt); #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVBRD | DBG_FUNC_END, (uint32_t)cond, 0, 0, 0, 0); #endif return(0); } /* * Signal a condition variable, waking a specified thread. */ int _new_pthread_cond_signal_thread_np(pthread_cond_t *ocond, pthread_t thread) { npthread_cond_t * cond = (npthread_cond_t *)ocond; int sig = cond->sig; npthread_mutex_t * mutex; int retval, dropcount; uint32_t lgenval, ugenval, diffgen, mgen, ugen, flags, mtxgen, mtxugen, notify; uint32_t * c_lseqcnt; uint32_t * c_useqcnt; uint64_t oldval64, newval64; int mutexrefs; uint32_t * pmtx = NULL; /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); if (cond->sig != _PTHREAD_COND_SIG) { LOCK(cond->lock); if (cond->sig != _PTHREAD_COND_SIG) { if (cond->sig == _PTHREAD_COND_SIG_init) { _new_pthread_cond_init(ocond, NULL, 0); } else { UNLOCK(cond->lock); return(EINVAL); } } UNLOCK(cond->lock); } #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_START, (uint32_t)cond, 0, 0, 0, 0); #endif COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt); retry: lgenval = *c_lseqcnt; ugenval = *c_useqcnt; diffgen = lgenval - ugenval; /* pendig waiters */ if (diffgen <= 0) { #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_END, (uint32_t)cond, 0, 0, 0, 0); #endif return(0); } mutex = cond->busy; if (OSAtomicCompareAndSwap32(ugenval, ugenval+1, (volatile int *)c_useqcnt) != TRUE) goto retry; #ifdef COND_MTX_WAITQUEUEMOVE if ((mutex != NULL) && (cond->pshared != PTHREAD_PROCESS_SHARED)) { #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_NONE, (uint32_t)cond, 1, 0, 0, 0); #endif (void)__mtx_holdlock(mutex, 1, &flags, &pmtx, &mgen, &ugen); mutexrefs = 1; } else { if (cond->pshared != PTHREAD_PROCESS_SHARED) flags = _PTHREAD_MTX_OPT_NOHOLD; else flags = _PTHREAD_MTX_OPT_NOHOLD | _PTHREAD_MTX_OPT_PSHARED; mgen = ugen = 0; mutexrefs = 0; } #else /* COND_MTX_WAITQUEUEMOVE */ if (cond->pshared != PTHREAD_PROCESS_SHARED) flags = _PTHREAD_MTX_OPT_NOHOLD; else flags = _PTHREAD_MTX_OPT_NOHOLD | _PTHREAD_MTX_OPT_PSHARED; mgen = ugen = 0; mutexrefs = 0; #endif /* COND_MTX_WAITQUEUEMOVE */ #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_NONE, (uint32_t)cond, 3, lgenval, ugenval+1, 0); #endif retval = __psynch_cvsignal(ocond, lgenval, ugenval+1,(pthread_mutex_t *)mutex, mgen, ugen, pthread_mach_thread_np(thread), flags); #ifdef COND_MTX_WAITQUEUEMOVE if ((retval != -1) && (retval != 0) && (mutexrefs != 0)) { dropcount = retval; #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_NONE, (uint32_t)cond, 4, dropcount, 0, 0); #endif retval = __mtx_droplock(mutex, dropcount, &flags, &pmtx, &mtxgen, &mtxugen, ¬ify); } #endif /* COND_MTX_WAITQUEUEMOVE */ if (lgenval == ugenval+1){ oldval64 = (((uint64_t)(ugenval+1)) << 32); oldval64 |= lgenval; newval64 = 0; OSAtomicCompareAndSwap64(oldval64, newval64, (volatile int64_t *)c_lseqcnt); #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_NONE, (uint32_t)cond, 5, 0, 0, 0); #endif } #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_END, (uint32_t)cond, 0, 0, 0, 0); #endif return (0); } /* * Signal a condition variable, waking only one thread. */ int _new_pthread_cond_signal(pthread_cond_t *cond) { return _new_pthread_cond_signal_thread_np(cond, NULL); } /* * Manage a list of condition variables associated with a mutex */ /* * Suspend waiting for a condition variable. * Note: we have to keep a list of condition variables which are using * this same mutex variable so we can detect invalid 'destroy' sequences. * If isconforming < 0, we skip the _pthread_testcancel(), but keep the * remaining conforming behavior.. */ __private_extern__ int __new_pthread_cond_wait(pthread_cond_t *ocond, pthread_mutex_t *omutex, const struct timespec *abstime, int isRelative, int isconforming) { int retval; npthread_cond_t * cond = (npthread_cond_t *)ocond; npthread_mutex_t * mutex = (npthread_mutex_t * )omutex; mach_timespec_t then = {0,0}; struct timespec cthen = {0,0}; int sig = cond->sig; int msig = mutex->sig; int firstfit = 0; npthread_mutex_t * pmtx; uint32_t mtxgen, mtxugen, flags, updateval, notify; uint32_t lgenval, ugenval; uint32_t * c_lseqcnt; uint32_t * c_useqcnt; uint32_t * npmtx = NULL; extern void _pthread_testcancel(pthread_t thread, int isconforming); /* to provide backwards compat for apps using united condtn vars */ if((sig != _PTHREAD_COND_SIG) && (sig != _PTHREAD_COND_SIG_init)) return(EINVAL); if (isconforming) { if((msig != _PTHREAD_MUTEX_SIG) && (msig != _PTHREAD_MUTEX_SIG_init)) return(EINVAL); if (isconforming > 0) _pthread_testcancel(pthread_self(), 1); } if (cond->sig != _PTHREAD_COND_SIG) { LOCK(cond->lock); if (cond->sig != _PTHREAD_COND_SIG_init) { UNLOCK(cond->lock); return (EINVAL); /* Not a condition variable */ } _new_pthread_cond_init(ocond, NULL, 0); UNLOCK(cond->lock); } #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_START, (uint32_t)cond, 0, 0, (uint32_t)abstime, 0); #endif COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt); /* send relative time to kernel */ if (abstime) { if (isRelative == 0) { struct timespec now; struct timeval tv; gettimeofday(&tv, NULL); TIMEVAL_TO_TIMESPEC(&tv, &now); /* Compute relative time to sleep */ then.tv_nsec = abstime->tv_nsec - now.tv_nsec; then.tv_sec = abstime->tv_sec - now.tv_sec; if (then.tv_nsec < 0) { then.tv_nsec += NSEC_PER_SEC; then.tv_sec--; } if (((int)then.tv_sec < 0) || ((then.tv_sec == 0) && (then.tv_nsec == 0))) { UNLOCK(cond->lock); return ETIMEDOUT; } if (isconforming != 0) { cthen.tv_sec = abstime->tv_sec; cthen.tv_nsec = abstime->tv_nsec; if ((cthen.tv_sec < 0) || (cthen.tv_nsec < 0)) { UNLOCK(cond->lock); return EINVAL; } if (cthen.tv_nsec >= NSEC_PER_SEC) { UNLOCK(cond->lock); return EINVAL; } } } else { then.tv_sec = abstime->tv_sec; then.tv_nsec = abstime->tv_nsec; } if(isconforming && ((then.tv_sec < 0) || (then.tv_nsec < 0))) { return EINVAL; } if (then.tv_nsec >= NSEC_PER_SEC) { return EINVAL; } } cond->busy = mutex; pmtx = mutex; ugenval = *c_useqcnt; lgenval = OSAtomicIncrement32((volatile int32_t *)c_lseqcnt); #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_NONE, (uint32_t)cond, 1, lgenval, ugenval, 0); #endif notify = 0; retval = __mtx_droplock(pmtx, 1, &flags, &npmtx, &mtxgen, &mtxugen, ¬ify); if (retval != 0) return(EINVAL); if ((notify & 1) == 0) { npmtx = NULL; } if ((notify & 0xc0000000) != 0) then.tv_nsec |= (notify & 0xc0000000); #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_NONE, (uint32_t)cond, 3, (uint32_t)mutex, 0, 0); #endif if (isconforming) { pthread_cleanup_push(_new_cond_cleanup, (void *)cond); updateval = __psynch_cvwait(ocond, lgenval, ugenval, (pthread_mutex_t *)npmtx, mtxgen, mtxugen, (uint64_t)then.tv_sec, (uint64_t)then.tv_nsec); pthread_cleanup_pop(0); } else { updateval = __psynch_cvwait(ocond, lgenval, ugenval, (pthread_mutex_t *)npmtx, mtxgen, mtxugen, (uint64_t)then.tv_sec, (uint64_t)then.tv_nsec); } retval = 0; #ifdef COND_MTX_WAITQUEUEMOVE /* Needs to handle timedout */ if (updateval == (uint32_t)-1) { retval = errno; #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_NONE, (uint32_t)cond, 4, retval, 0, 0); #endif /* add unlock ref to show one less waiter */ _new_cond_dropwait(cond); pthread_mutex_lock(omutex); } else if ((updateval & PTHRW_MTX_NONE) != 0) { #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_NONE, (uint32_t)cond, 5, updateval, 0, 0); #endif pthread_mutex_lock(omutex); } else { /* on successful return mutex held */ /* returns 0 on succesful update */ #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_NONE, (uint32_t)cond, 6, updateval, 0, 0); #endif firstfit = (mutex->mtxopts.options.policy == _PTHREAD_MUTEX_POLICY_FIRSTFIT); if (__mtx_updatebits( mutex, updateval, firstfit, 1) == 1) { /* not expected to be here */ LIBC_ABORT("CONDWAIT mutex acquire mishap"); } if (mutex->mtxopts.options.type == PTHREAD_MUTEX_RECURSIVE) mutex->mtxopts.options.lock_count++; } #else /* COND_MTX_WAITQUEUEMOVE */ if (updateval == (uint32_t)-1) { if (errno == ETIMEDOUT) { retval = ETIMEDOUT; } else if (errno == EINTR) { /* ** EINTR can be treated as a spurious wakeup unless we were canceled. */ retval = 0; } else retval = EINVAL; /* add unlock ref to show one less waiter */ _new_cond_dropwait(cond); } else retval = 0; #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_NONE, (uint32_t)cond, 4, retval, 0, 0); #endif pthread_mutex_lock(omutex); #endif /* COND_MTX_WAITQUEUEMOVE */ #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVWAIT | DBG_FUNC_END, (uint32_t)cond, 0, 0, retval, 0); #endif return(retval); } static void _new_cond_cleanup(void *arg) { npthread_cond_t *cond = (npthread_cond_t *)arg; pthread_mutex_t *mutex; // 4597450: begin pthread_t thread = pthread_self(); int thcanceled = 0; LOCK(thread->lock); thcanceled = (thread->detached & _PTHREAD_WASCANCEL); UNLOCK(thread->lock); if (thcanceled == 0) return; // 4597450: end mutex = cond->busy; /* add unlock ref to show one less waiter */ _new_cond_dropwait(cond); /* ** Can't do anything if this fails -- we're on the way out */ if (mutex != NULL) (void)pthread_mutex_lock(mutex); } void _new_cond_dropwait(npthread_cond_t * cond) { int sig = cond->sig; int retval; uint32_t lgenval, ugenval, diffgen, mgen, ugen, flags; uint32_t * c_lseqcnt; uint32_t * c_useqcnt; uint64_t oldval64, newval64; /* to provide backwards compat for apps using united condtn vars */ if (sig != _PTHREAD_COND_SIG) return; #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_START, (uint32_t)cond, 0, 0, 0xee, 0); #endif COND_GETSEQ_ADDR(cond, c_lseqcnt, c_useqcnt); retry: lgenval = *c_lseqcnt; ugenval = *c_useqcnt; diffgen = lgenval - ugenval; /* pending waiters */ if (diffgen <= 0) { #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_END, (uint32_t)cond, 1, 0, 0xee, 0); #endif return; } if (OSAtomicCompareAndSwap32(ugenval, ugenval+1, (volatile int *)c_useqcnt) != TRUE) goto retry; if (lgenval == ugenval+1) { /* last one */ /* send last drop notify to erase pre post */ flags = _PTHREAD_MTX_OPT_LASTDROP; if (cond->pshared == PTHREAD_PROCESS_SHARED) flags |= _PTHREAD_MTX_OPT_PSHARED; mgen = ugen = 0; #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_NONE, (uint32_t)cond, 1, 0, 0xee, 0); #endif retval = __psynch_cvsignal((pthread_cond_t *)cond, lgenval, ugenval+1,(pthread_mutex_t *)NULL, mgen, ugen, MACH_PORT_NULL, flags); oldval64 = (((uint64_t)(ugenval+1)) << 32); oldval64 |= lgenval; newval64 = 0; OSAtomicCompareAndSwap64(oldval64, newval64, (volatile int64_t *)c_lseqcnt); } #if _KSYN_TRACE_ (void)__kdebug_trace(_KSYN_TRACE_UM_CVSIG | DBG_FUNC_END, (uint32_t)cond, 2, 0, 0xee, 0); #endif return; } int _new_pthread_cond_timedwait_relative_np(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) { return (__new_pthread_cond_wait(cond, mutex, abstime, 1, 0)); } int _new_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) { return(__new_pthread_cond_wait(cond, mutex, 0, 0, 1)); } int _new_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) { return(__new_pthread_cond_wait(cond, mutex, abstime, 0, 1)); } #endif /* __i386__ || __x86_64__ */ #else /* !BUILDING_VARIANT */ extern int _pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime, int isRelative, int isconforming); #endif /* !BUILDING_VARIANT ] */ /* * Initialize a condition variable. Note: 'attr' is ignored. */ /* * Initialize a condition variable. This is the public interface. * We can't trust the lock, so initialize it first before taking * it. */ int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr) { int conforming; #if __DARWIN_UNIX03 conforming = 1; #else /* __DARWIN_UNIX03 */ conforming = 0; #endif /* __DARWIN_UNIX03 */ LOCK_INIT(cond->lock); #if defined(__i386__) || defined(__x86_64__) if ((attr != NULL) && (attr->pshared == PTHREAD_PROCESS_SHARED)) { return(_new_pthread_cond_init(cond, attr, conforming)); } #endif /* __i386__ || __x86_64__ */ return (_pthread_cond_init(cond, attr, conforming)); } /* int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) moved to pthread_cancelable.c */ |