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Asterisk developer's documentation


lock.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2010, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief General Asterisk locking.
00022  */
00023 
00024 /*** MODULEINFO
00025    <support_level>core</support_level>
00026  ***/
00027 
00028 #include "asterisk.h"
00029 
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 398648 $")
00031 
00032 #include "asterisk/utils.h"
00033 #include "asterisk/lock.h"
00034 
00035 /* Allow direct use of pthread_mutex_* / pthread_cond_* */
00036 #undef pthread_mutex_init
00037 #undef pthread_mutex_destroy
00038 #undef pthread_mutex_lock
00039 #undef pthread_mutex_trylock
00040 #undef pthread_mutex_t
00041 #undef pthread_mutex_unlock
00042 #undef pthread_cond_init
00043 #undef pthread_cond_signal
00044 #undef pthread_cond_broadcast
00045 #undef pthread_cond_destroy
00046 #undef pthread_cond_wait
00047 #undef pthread_cond_timedwait
00048 
00049 #if defined(DEBUG_THREADS) && defined(HAVE_BKTR)
00050 static void __dump_backtrace(struct ast_bt *bt, int canlog)
00051 {
00052    char **strings;
00053    ssize_t i;
00054 
00055    strings = backtrace_symbols(bt->addresses, bt->num_frames);
00056 
00057    for (i = 0; i < bt->num_frames; i++) {
00058       __ast_mutex_logger("%s\n", strings[i]);
00059    }
00060 
00061    ast_std_free(strings);
00062 }
00063 #endif   /* defined(DEBUG_THREADS) && defined(HAVE_BKTR) */
00064 
00065 int __ast_pthread_mutex_init(int tracking, const char *filename, int lineno, const char *func,
00066                   const char *mutex_name, ast_mutex_t *t)
00067 {
00068    int res;
00069    pthread_mutexattr_t  attr;
00070 
00071 #ifdef DEBUG_THREADS
00072    t->track = NULL;
00073 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00074    if ((t->mutex) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00075 /*
00076       int canlog = strcmp(filename, "logger.c") & track;
00077       __ast_mutex_logger("%s line %d (%s): NOTICE: mutex '%s' is already initialized.\n",
00078                filename, lineno, func, mutex_name);
00079       DO_THREAD_CRASH;
00080 */
00081       return 0;
00082    }
00083 
00084 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00085 
00086    if ((t->tracking = tracking)) {
00087       ast_reentrancy_init(&t->track);
00088    }
00089 #endif /* DEBUG_THREADS */
00090 
00091    pthread_mutexattr_init(&attr);
00092    pthread_mutexattr_settype(&attr, AST_MUTEX_KIND);
00093 
00094    res = pthread_mutex_init(&t->mutex, &attr);
00095    pthread_mutexattr_destroy(&attr);
00096    return res;
00097 }
00098 
00099 int __ast_pthread_mutex_destroy(const char *filename, int lineno, const char *func,
00100                   const char *mutex_name, ast_mutex_t *t)
00101 {
00102    int res;
00103 
00104 #ifdef DEBUG_THREADS
00105    struct ast_lock_track *lt;
00106    int canlog = strcmp(filename, "logger.c") & t->tracking;
00107 
00108 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00109    if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00110       /* Don't try to uninitialize non initialized mutex
00111        * This may no effect on linux
00112        * And always ganerate core on *BSD with
00113        * linked libpthread
00114        * This not error condition if the mutex created on the fly.
00115        */
00116       __ast_mutex_logger("%s line %d (%s): NOTICE: mutex '%s' is uninitialized.\n",
00117                filename, lineno, func, mutex_name);
00118       return 0;
00119    }
00120 #endif
00121 
00122    if (t->tracking && !t->track) {
00123       ast_reentrancy_init(&t->track);
00124    }
00125    lt = t->track;
00126 
00127    res = pthread_mutex_trylock(&t->mutex);
00128    switch (res) {
00129    case 0:
00130       pthread_mutex_unlock(&t->mutex);
00131       break;
00132    case EINVAL:
00133       __ast_mutex_logger("%s line %d (%s): Error: attempt to destroy invalid mutex '%s'.\n",
00134               filename, lineno, func, mutex_name);
00135       break;
00136    case EBUSY:
00137       __ast_mutex_logger("%s line %d (%s): Error: attempt to destroy locked mutex '%s'.\n",
00138                filename, lineno, func, mutex_name);
00139       if (t->tracking) {
00140          ast_reentrancy_lock(lt);
00141          __ast_mutex_logger("%s line %d (%s): Error: '%s' was locked here.\n",
00142                 lt->file[ROFFSET], lt->lineno[ROFFSET], lt->func[ROFFSET], mutex_name);
00143 #ifdef HAVE_BKTR
00144          __dump_backtrace(&lt->backtrace[ROFFSET], canlog);
00145 #endif
00146          ast_reentrancy_unlock(lt);
00147       }
00148       break;
00149    }
00150 #endif /* DEBUG_THREADS */
00151 
00152    res = pthread_mutex_destroy(&t->mutex);
00153 
00154 #ifdef DEBUG_THREADS
00155    if (res) {
00156       __ast_mutex_logger("%s line %d (%s): Error destroying mutex %s: %s\n",
00157                filename, lineno, func, mutex_name, strerror(res));
00158    }
00159    if (t->tracking) {
00160       ast_reentrancy_lock(lt);
00161       lt->file[0] = filename;
00162       lt->lineno[0] = lineno;
00163       lt->func[0] = func;
00164       lt->reentrancy = 0;
00165       lt->thread[0] = 0;
00166 #ifdef HAVE_BKTR
00167       memset(&lt->backtrace[0], 0, sizeof(lt->backtrace[0]));
00168 #endif
00169       ast_reentrancy_unlock(lt);
00170       delete_reentrancy_cs(&t->track);
00171    }
00172 #endif /* DEBUG_THREADS */
00173 
00174    return res;
00175 }
00176 
00177 int __ast_pthread_mutex_lock(const char *filename, int lineno, const char *func,
00178                                            const char* mutex_name, ast_mutex_t *t)
00179 {
00180    int res;
00181 
00182 #ifdef DEBUG_THREADS
00183    struct ast_lock_track *lt;
00184    int canlog = strcmp(filename, "logger.c") & t->tracking;
00185 #ifdef HAVE_BKTR
00186    struct ast_bt *bt = NULL;
00187 #endif
00188 
00189 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00190    if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00191       /* Don't warn abount uninitialized mutex.
00192        * Simple try to initialize it.
00193        * May be not needed in linux system.
00194        */
00195       res = __ast_pthread_mutex_init(t->tracking, filename, lineno, func, mutex_name, t);
00196       if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00197          __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
00198                 filename, lineno, func, mutex_name);
00199          return res;
00200       }
00201    }
00202 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00203 
00204    if (t->tracking && !t->track) {
00205       ast_reentrancy_init(&t->track);
00206    }
00207    lt = t->track;
00208 
00209    if (t->tracking) {
00210 #ifdef HAVE_BKTR
00211       struct ast_bt tmp;
00212 
00213       /* The implementation of backtrace() may have its own locks.
00214        * Capture the backtrace outside of the reentrancy lock to
00215        * avoid deadlocks. See ASTERISK-22455. */
00216       ast_bt_get_addresses(&tmp);
00217 
00218       ast_reentrancy_lock(lt);
00219       if (lt->reentrancy != AST_MAX_REENTRANCY) {
00220          lt->backtrace[lt->reentrancy] = tmp;
00221          bt = &lt->backtrace[lt->reentrancy];
00222       }
00223       ast_reentrancy_unlock(lt);
00224 
00225       ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, t, bt);
00226 #else
00227       ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, t);
00228 #endif
00229    }
00230 #endif /* DEBUG_THREADS */
00231 
00232 #if defined(DETECT_DEADLOCKS) && defined(DEBUG_THREADS)
00233    {
00234       time_t seconds = time(NULL);
00235       time_t wait_time, reported_wait = 0;
00236       do {
00237 #ifdef   HAVE_MTX_PROFILE
00238          ast_mark(mtx_prof, 1);
00239 #endif
00240          res = pthread_mutex_trylock(&t->mutex);
00241 #ifdef   HAVE_MTX_PROFILE
00242          ast_mark(mtx_prof, 0);
00243 #endif
00244          if (res == EBUSY) {
00245             wait_time = time(NULL) - seconds;
00246             if (wait_time > reported_wait && (wait_time % 5) == 0) {
00247                __ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for mutex '%s'?\n",
00248                         filename, lineno, func, (int) wait_time, mutex_name);
00249                ast_reentrancy_lock(lt);
00250 #ifdef HAVE_BKTR
00251                __dump_backtrace(&lt->backtrace[lt->reentrancy], canlog);
00252 #endif
00253                __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
00254                         lt->file[ROFFSET], lt->lineno[ROFFSET],
00255                         lt->func[ROFFSET], mutex_name);
00256 #ifdef HAVE_BKTR
00257                __dump_backtrace(&lt->backtrace[ROFFSET], canlog);
00258 #endif
00259                ast_reentrancy_unlock(lt);
00260                reported_wait = wait_time;
00261             }
00262             usleep(200);
00263          }
00264       } while (res == EBUSY);
00265    }
00266 #else /* !DETECT_DEADLOCKS || !DEBUG_THREADS */
00267 #ifdef   HAVE_MTX_PROFILE
00268    ast_mark(mtx_prof, 1);
00269    res = pthread_mutex_trylock(&t->mutex);
00270    ast_mark(mtx_prof, 0);
00271    if (res)
00272 #endif
00273    res = pthread_mutex_lock(&t->mutex);
00274 #endif /* !DETECT_DEADLOCKS || !DEBUG_THREADS */
00275 
00276 #ifdef DEBUG_THREADS
00277    if (t->tracking && !res) {
00278       ast_reentrancy_lock(lt);
00279       if (lt->reentrancy < AST_MAX_REENTRANCY) {
00280          lt->file[lt->reentrancy] = filename;
00281          lt->lineno[lt->reentrancy] = lineno;
00282          lt->func[lt->reentrancy] = func;
00283          lt->thread[lt->reentrancy] = pthread_self();
00284          lt->reentrancy++;
00285       } else {
00286          __ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n",
00287                         filename, lineno, func, mutex_name);
00288       }
00289       ast_reentrancy_unlock(lt);
00290       if (t->tracking) {
00291          ast_mark_lock_acquired(t);
00292       }
00293    } else if (t->tracking) {
00294 #ifdef HAVE_BKTR
00295       if (lt->reentrancy) {
00296          ast_reentrancy_lock(lt);
00297          bt = &lt->backtrace[lt->reentrancy-1];
00298          ast_reentrancy_unlock(lt);
00299       } else {
00300          bt = NULL;
00301       }
00302       ast_remove_lock_info(t, bt);
00303 #else
00304       ast_remove_lock_info(t);
00305 #endif
00306    }
00307    if (res) {
00308       __ast_mutex_logger("%s line %d (%s): Error obtaining mutex: %s\n",
00309                filename, lineno, func, strerror(res));
00310       DO_THREAD_CRASH;
00311    }
00312 #endif /* DEBUG_THREADS */
00313 
00314    return res;
00315 }
00316 
00317 int __ast_pthread_mutex_trylock(const char *filename, int lineno, const char *func,
00318                                               const char* mutex_name, ast_mutex_t *t)
00319 {
00320    int res;
00321 
00322 #ifdef DEBUG_THREADS
00323    struct ast_lock_track *lt;
00324    int canlog = strcmp(filename, "logger.c") & t->tracking;
00325 #ifdef HAVE_BKTR
00326    struct ast_bt *bt = NULL;
00327 #endif
00328 
00329 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00330    if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00331       /* Don't warn abount uninitialized mutex.
00332        * Simple try to initialize it.
00333        * May be not needed in linux system.
00334        */
00335       res = __ast_pthread_mutex_init(t->tracking, filename, lineno, func, mutex_name, t);
00336       if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00337          __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
00338                 filename, lineno, func, mutex_name);
00339          return res;
00340       }
00341    }
00342 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00343 
00344    if (t->tracking && !t->track) {
00345       ast_reentrancy_init(&t->track);
00346    }
00347    lt = t->track;
00348 
00349    if (t->tracking) {
00350 #ifdef HAVE_BKTR
00351       struct ast_bt tmp;
00352 
00353       /* The implementation of backtrace() may have its own locks.
00354        * Capture the backtrace outside of the reentrancy lock to
00355        * avoid deadlocks. See ASTERISK-22455. */
00356       ast_bt_get_addresses(&tmp);
00357 
00358       ast_reentrancy_lock(lt);
00359       if (lt->reentrancy != AST_MAX_REENTRANCY) {
00360          lt->backtrace[lt->reentrancy] = tmp;
00361          bt = &lt->backtrace[lt->reentrancy];
00362       }
00363       ast_reentrancy_unlock(lt);
00364 
00365       ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, t, bt);
00366 #else
00367       ast_store_lock_info(AST_MUTEX, filename, lineno, func, mutex_name, t);
00368 #endif
00369    }
00370 #endif /* DEBUG_THREADS */
00371 
00372    res = pthread_mutex_trylock(&t->mutex);
00373 
00374 #ifdef DEBUG_THREADS
00375    if (t->tracking && !res) {
00376       ast_reentrancy_lock(lt);
00377       if (lt->reentrancy < AST_MAX_REENTRANCY) {
00378          lt->file[lt->reentrancy] = filename;
00379          lt->lineno[lt->reentrancy] = lineno;
00380          lt->func[lt->reentrancy] = func;
00381          lt->thread[lt->reentrancy] = pthread_self();
00382          lt->reentrancy++;
00383       } else {
00384          __ast_mutex_logger("%s line %d (%s): '%s' really deep reentrancy!\n",
00385                   filename, lineno, func, mutex_name);
00386       }
00387       ast_reentrancy_unlock(lt);
00388       if (t->tracking) {
00389          ast_mark_lock_acquired(t);
00390       }
00391    } else if (t->tracking) {
00392       ast_mark_lock_failed(t);
00393    }
00394 #endif /* DEBUG_THREADS */
00395 
00396    return res;
00397 }
00398 
00399 int __ast_pthread_mutex_unlock(const char *filename, int lineno, const char *func,
00400                     const char *mutex_name, ast_mutex_t *t)
00401 {
00402    int res;
00403 
00404 #ifdef DEBUG_THREADS
00405    struct ast_lock_track *lt;
00406    int canlog = strcmp(filename, "logger.c") & t->tracking;
00407 #ifdef HAVE_BKTR
00408    struct ast_bt *bt = NULL;
00409 #endif
00410 
00411 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00412    if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00413       __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
00414                filename, lineno, func, mutex_name);
00415       res = __ast_pthread_mutex_init(t->tracking, filename, lineno, func, mutex_name, t);
00416       if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00417          __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
00418                 filename, lineno, func, mutex_name);
00419       }
00420       return res;
00421    }
00422 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00423 
00424    if (t->tracking && !t->track) {
00425       ast_reentrancy_init(&t->track);
00426    }
00427    lt = t->track;
00428 
00429    if (t->tracking) {
00430       ast_reentrancy_lock(lt);
00431       if (lt->reentrancy && (lt->thread[ROFFSET] != pthread_self())) {
00432          __ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n",
00433                   filename, lineno, func, mutex_name);
00434          __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
00435                   lt->file[ROFFSET], lt->lineno[ROFFSET], lt->func[ROFFSET], mutex_name);
00436 #ifdef HAVE_BKTR
00437          __dump_backtrace(&lt->backtrace[ROFFSET], canlog);
00438 #endif
00439          DO_THREAD_CRASH;
00440       }
00441 
00442       if (--lt->reentrancy < 0) {
00443          __ast_mutex_logger("%s line %d (%s): mutex '%s' freed more times than we've locked!\n",
00444                   filename, lineno, func, mutex_name);
00445          lt->reentrancy = 0;
00446       }
00447 
00448       if (lt->reentrancy < AST_MAX_REENTRANCY) {
00449          lt->file[lt->reentrancy] = NULL;
00450          lt->lineno[lt->reentrancy] = 0;
00451          lt->func[lt->reentrancy] = NULL;
00452          lt->thread[lt->reentrancy] = 0;
00453       }
00454 
00455 #ifdef HAVE_BKTR
00456       if (lt->reentrancy) {
00457          bt = &lt->backtrace[lt->reentrancy - 1];
00458       }
00459 #endif
00460       ast_reentrancy_unlock(lt);
00461 
00462 #ifdef HAVE_BKTR
00463       ast_remove_lock_info(t, bt);
00464 #else
00465       ast_remove_lock_info(t);
00466 #endif
00467    }
00468 #endif /* DEBUG_THREADS */
00469 
00470    res = pthread_mutex_unlock(&t->mutex);
00471 
00472 #ifdef DEBUG_THREADS
00473    if (res) {
00474       __ast_mutex_logger("%s line %d (%s): Error releasing mutex: %s\n",
00475                filename, lineno, func, strerror(res));
00476       DO_THREAD_CRASH;
00477    }
00478 #endif /* DEBUG_THREADS */
00479 
00480    return res;
00481 }
00482 
00483 
00484 int __ast_cond_init(const char *filename, int lineno, const char *func,
00485               const char *cond_name, ast_cond_t *cond, pthread_condattr_t *cond_attr)
00486 {
00487    return pthread_cond_init(cond, cond_attr);
00488 }
00489 
00490 int __ast_cond_signal(const char *filename, int lineno, const char *func,
00491                 const char *cond_name, ast_cond_t *cond)
00492 {
00493    return pthread_cond_signal(cond);
00494 }
00495 
00496 int __ast_cond_broadcast(const char *filename, int lineno, const char *func,
00497                    const char *cond_name, ast_cond_t *cond)
00498 {
00499    return pthread_cond_broadcast(cond);
00500 }
00501 
00502 int __ast_cond_destroy(const char *filename, int lineno, const char *func,
00503                  const char *cond_name, ast_cond_t *cond)
00504 {
00505    return pthread_cond_destroy(cond);
00506 }
00507 
00508 int __ast_cond_wait(const char *filename, int lineno, const char *func,
00509               const char *cond_name, const char *mutex_name,
00510               ast_cond_t *cond, ast_mutex_t *t)
00511 {
00512    int res;
00513 
00514 #ifdef DEBUG_THREADS
00515    struct ast_lock_track *lt;
00516    struct ast_lock_track lt_orig;
00517    int canlog = strcmp(filename, "logger.c") & t->tracking;
00518 
00519 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00520    if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00521       __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
00522                filename, lineno, func, mutex_name);
00523       res = __ast_pthread_mutex_init(t->tracking, filename, lineno, func, mutex_name, t);
00524       if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00525          __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
00526                 filename, lineno, func, mutex_name);
00527       }
00528       return res;
00529    }
00530 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00531 
00532    if (t->tracking && !t->track) {
00533       ast_reentrancy_init(&t->track);
00534    }
00535    lt = t->track;
00536 
00537    if (t->tracking) {
00538       ast_reentrancy_lock(lt);
00539       if (lt->reentrancy && (lt->thread[ROFFSET] != pthread_self())) {
00540          __ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n",
00541                   filename, lineno, func, mutex_name);
00542          __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
00543                   lt->file[ROFFSET], lt->lineno[ROFFSET], lt->func[ROFFSET], mutex_name);
00544 #ifdef HAVE_BKTR
00545          __dump_backtrace(&lt->backtrace[ROFFSET], canlog);
00546 #endif
00547          DO_THREAD_CRASH;
00548       } else if (lt->reentrancy <= 0) {
00549          __ast_mutex_logger("%s line %d (%s): attempted to wait on an unlocked mutex '%s'\n",
00550                   filename, lineno, func, mutex_name);
00551          DO_THREAD_CRASH;
00552       }
00553 
00554       /* Waiting on a condition completely suspends a recursive mutex,
00555        * even if it's been recursively locked multiple times. Make a
00556        * copy of the lock tracking, and reset reentrancy to zero */
00557       lt_orig = *lt;
00558       lt->reentrancy = 0;
00559       ast_reentrancy_unlock(lt);
00560 
00561       ast_suspend_lock_info(t);
00562    }
00563 #endif /* DEBUG_THREADS */
00564 
00565    res = pthread_cond_wait(cond, &t->mutex);
00566 
00567 #ifdef DEBUG_THREADS
00568    if (res) {
00569       __ast_mutex_logger("%s line %d (%s): Error waiting on condition mutex '%s'\n",
00570                filename, lineno, func, strerror(res));
00571       DO_THREAD_CRASH;
00572    } else if (t->tracking) {
00573       pthread_mutex_t reentr_mutex_orig;
00574       ast_reentrancy_lock(lt);
00575       /* Restore lock tracking to what it was prior to the wait */
00576       reentr_mutex_orig = lt->reentr_mutex;
00577       *lt = lt_orig;
00578       /* un-trash the mutex we just copied over */
00579       lt->reentr_mutex = reentr_mutex_orig;
00580       ast_reentrancy_unlock(lt);
00581 
00582       ast_restore_lock_info(t);
00583    }
00584 #endif /* DEBUG_THREADS */
00585 
00586    return res;
00587 }
00588 
00589 int __ast_cond_timedwait(const char *filename, int lineno, const char *func,
00590                    const char *cond_name, const char *mutex_name, ast_cond_t *cond,
00591                    ast_mutex_t *t, const struct timespec *abstime)
00592 {
00593    int res;
00594 
00595 #ifdef DEBUG_THREADS
00596    struct ast_lock_track *lt;
00597    struct ast_lock_track lt_orig;
00598    int canlog = strcmp(filename, "logger.c") & t->tracking;
00599 
00600 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00601    if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00602       __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
00603                filename, lineno, func, mutex_name);
00604       res = __ast_pthread_mutex_init(t->tracking, filename, lineno, func, mutex_name, t);
00605       if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
00606          __ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized and unable to initialize.\n",
00607                 filename, lineno, func, mutex_name);
00608       }
00609       return res;
00610    }
00611 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00612 
00613    if (t->tracking && !t->track) {
00614       ast_reentrancy_init(&t->track);
00615    }
00616    lt = t->track;
00617 
00618    if (t->tracking) {
00619       ast_reentrancy_lock(lt);
00620       if (lt->reentrancy && (lt->thread[ROFFSET] != pthread_self())) {
00621          __ast_mutex_logger("%s line %d (%s): attempted unlock mutex '%s' without owning it!\n",
00622                   filename, lineno, func, mutex_name);
00623          __ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",
00624                   lt->file[ROFFSET], lt->lineno[ROFFSET], lt->func[ROFFSET], mutex_name);
00625 #ifdef HAVE_BKTR
00626          __dump_backtrace(&lt->backtrace[ROFFSET], canlog);
00627 #endif
00628          DO_THREAD_CRASH;
00629       } else if (lt->reentrancy <= 0) {
00630          __ast_mutex_logger("%s line %d (%s): attempted to wait on an unlocked mutex '%s'\n",
00631                   filename, lineno, func, mutex_name);
00632          DO_THREAD_CRASH;
00633       }
00634 
00635       /* Waiting on a condition completely suspends a recursive mutex,
00636        * even if it's been recursively locked multiple times. Make a
00637        * copy of the lock tracking, and reset reentrancy to zero */
00638       lt_orig = *lt;
00639       lt->reentrancy = 0;
00640       ast_reentrancy_unlock(lt);
00641 
00642       ast_suspend_lock_info(t);
00643    }
00644 #endif /* DEBUG_THREADS */
00645 
00646    res = pthread_cond_timedwait(cond, &t->mutex, abstime);
00647 
00648 #ifdef DEBUG_THREADS
00649    if (res && (res != ETIMEDOUT)) {
00650       __ast_mutex_logger("%s line %d (%s): Error waiting on condition mutex '%s'\n",
00651                filename, lineno, func, strerror(res));
00652       DO_THREAD_CRASH;
00653    } else if (t->tracking) {
00654       pthread_mutex_t reentr_mutex_orig;
00655       ast_reentrancy_lock(lt);
00656       /* Restore lock tracking to what it was prior to the wait */
00657       reentr_mutex_orig = lt->reentr_mutex;
00658       *lt = lt_orig;
00659       /* un-trash the mutex we just copied over */
00660       lt->reentr_mutex = reentr_mutex_orig;
00661       ast_reentrancy_unlock(lt);
00662 
00663       ast_suspend_lock_info(t);
00664    }
00665 #endif /* DEBUG_THREADS */
00666 
00667    return res;
00668 }
00669 
00670 int __ast_rwlock_init(int tracking, const char *filename, int lineno, const char *func, const char *rwlock_name, ast_rwlock_t *t)
00671 {
00672    int res;
00673    pthread_rwlockattr_t attr;
00674 
00675 #ifdef DEBUG_THREADS
00676 
00677 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00678    int canlog = strcmp(filename, "logger.c") & t->tracking;
00679 
00680    if (t->lock != ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00681       __ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is already initialized.\n",
00682             filename, lineno, func, rwlock_name);
00683       return 0;
00684    }
00685 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00686 
00687    if ((t->tracking = tracking)) {
00688       ast_reentrancy_init(&t->track);
00689    }
00690 #endif /* DEBUG_THREADS */
00691 
00692    pthread_rwlockattr_init(&attr);
00693 
00694 #ifdef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
00695    pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP);
00696 #endif
00697 
00698    res = pthread_rwlock_init(&t->lock, &attr);
00699    pthread_rwlockattr_destroy(&attr);
00700    return res;
00701 }
00702 
00703 int __ast_rwlock_destroy(const char *filename, int lineno, const char *func, const char *rwlock_name, ast_rwlock_t *t)
00704 {
00705    int res;
00706 
00707 #ifdef DEBUG_THREADS
00708    struct ast_lock_track *lt = t->track;
00709    int canlog = strcmp(filename, "logger.c") & t->tracking;
00710 
00711 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00712    if (t->lock == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00713       __ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is uninitialized.\n",
00714                filename, lineno, func, rwlock_name);
00715       return 0;
00716    }
00717 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00718 
00719 #endif /* DEBUG_THREADS */
00720 
00721    res = pthread_rwlock_destroy(&t->lock);
00722 
00723 #ifdef DEBUG_THREADS
00724    if (res) {
00725       __ast_mutex_logger("%s line %d (%s): Error destroying rwlock %s: %s\n",
00726             filename, lineno, func, rwlock_name, strerror(res));
00727    }
00728    if (t->tracking && lt) {
00729       ast_reentrancy_lock(lt);
00730       lt->file[0] = filename;
00731       lt->lineno[0] = lineno;
00732       lt->func[0] = func;
00733       lt->reentrancy = 0;
00734       lt->thread[0] = 0;
00735 #ifdef HAVE_BKTR
00736       memset(&lt->backtrace[0], 0, sizeof(lt->backtrace[0]));
00737 #endif
00738       ast_reentrancy_unlock(lt);
00739       delete_reentrancy_cs(&t->track);
00740    }
00741 #endif /* DEBUG_THREADS */
00742 
00743    return res;
00744 }
00745 
00746 int __ast_rwlock_unlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name)
00747 {
00748    int res;
00749 
00750 #ifdef DEBUG_THREADS
00751    struct ast_lock_track *lt;
00752    int canlog = strcmp(filename, "logger.c") & t->tracking;
00753 #ifdef HAVE_BKTR
00754    struct ast_bt *bt = NULL;
00755 #endif
00756    int lock_found = 0;
00757 
00758 
00759 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00760    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00761       __ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is uninitialized.\n",
00762                filename, line, func, name);
00763       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
00764       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00765          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
00766                filename, line, func, name);
00767       }
00768       return res;
00769    }
00770 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00771 
00772    if (t->tracking && !t->track) {
00773       ast_reentrancy_init(&t->track);
00774    }
00775    lt = t->track;
00776 
00777    if (t->tracking) {
00778       ast_reentrancy_lock(lt);
00779       if (lt->reentrancy) {
00780          int i;
00781          pthread_t self = pthread_self();
00782          for (i = lt->reentrancy - 1; i >= 0; --i) {
00783             if (lt->thread[i] == self) {
00784                lock_found = 1;
00785                if (i != lt->reentrancy - 1) {
00786                   lt->file[i] = lt->file[lt->reentrancy - 1];
00787                   lt->lineno[i] = lt->lineno[lt->reentrancy - 1];
00788                   lt->func[i] = lt->func[lt->reentrancy - 1];
00789                   lt->thread[i] = lt->thread[lt->reentrancy - 1];
00790                }
00791 #ifdef HAVE_BKTR
00792                bt = &lt->backtrace[i];
00793 #endif
00794                lt->file[lt->reentrancy - 1] = NULL;
00795                lt->lineno[lt->reentrancy - 1] = 0;
00796                lt->func[lt->reentrancy - 1] = NULL;
00797                lt->thread[lt->reentrancy - 1] = AST_PTHREADT_NULL;
00798                break;
00799             }
00800          }
00801       }
00802 
00803       if (lock_found && --lt->reentrancy < 0) {
00804          __ast_mutex_logger("%s line %d (%s): rwlock '%s' freed more times than we've locked!\n",
00805                filename, line, func, name);
00806          lt->reentrancy = 0;
00807       }
00808 
00809       ast_reentrancy_unlock(lt);
00810 
00811 #ifdef HAVE_BKTR
00812       ast_remove_lock_info(t, bt);
00813 #else
00814       ast_remove_lock_info(t);
00815 #endif
00816    }
00817 #endif /* DEBUG_THREADS */
00818 
00819    res = pthread_rwlock_unlock(&t->lock);
00820 
00821 #ifdef DEBUG_THREADS
00822    if (res) {
00823       __ast_mutex_logger("%s line %d (%s): Error releasing rwlock: %s\n",
00824             filename, line, func, strerror(res));
00825       DO_THREAD_CRASH;
00826    }
00827 #endif /* DEBUG_THREADS */
00828 
00829    return res;
00830 }
00831 
00832 int __ast_rwlock_rdlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name)
00833 {
00834    int res;
00835 
00836 #ifdef DEBUG_THREADS
00837    struct ast_lock_track *lt;
00838    int canlog = strcmp(filename, "logger.c") & t->tracking;
00839 #ifdef HAVE_BKTR
00840    struct ast_bt *bt = NULL;
00841 #endif
00842 
00843 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00844    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00845        /* Don't warn abount uninitialized lock.
00846         * Simple try to initialize it.
00847         * May be not needed in linux system.
00848         */
00849       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
00850       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00851          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
00852                filename, line, func, name);
00853          return res;
00854       }
00855    }
00856 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00857 
00858    if (t->tracking && !t->track) {
00859       ast_reentrancy_init(&t->track);
00860    }
00861    lt = t->track;
00862 
00863    if (t->tracking) {
00864 #ifdef HAVE_BKTR
00865       struct ast_bt tmp;
00866 
00867       /* The implementation of backtrace() may have its own locks.
00868        * Capture the backtrace outside of the reentrancy lock to
00869        * avoid deadlocks. See ASTERISK-22455. */
00870       ast_bt_get_addresses(&tmp);
00871 
00872       ast_reentrancy_lock(lt);
00873       if (lt->reentrancy != AST_MAX_REENTRANCY) {
00874          lt->backtrace[lt->reentrancy] = tmp;
00875          bt = &lt->backtrace[lt->reentrancy];
00876       }
00877       ast_reentrancy_unlock(lt);
00878 
00879       ast_store_lock_info(AST_RDLOCK, filename, line, func, name, t, bt);
00880 #else
00881       ast_store_lock_info(AST_RDLOCK, filename, line, func, name, t);
00882 #endif
00883    }
00884 #endif /* DEBUG_THREADS */
00885 
00886 #if defined(DETECT_DEADLOCKS) && defined(DEBUG_THREADS)
00887    {
00888       time_t seconds = time(NULL);
00889       time_t wait_time, reported_wait = 0;
00890       do {
00891          res = pthread_rwlock_tryrdlock(&t->lock);
00892          if (res == EBUSY) {
00893             wait_time = time(NULL) - seconds;
00894             if (wait_time > reported_wait && (wait_time % 5) == 0) {
00895                __ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for readlock '%s'?\n",
00896                   filename, line, func, (int)wait_time, name);
00897                if (t->tracking) {
00898                   ast_reentrancy_lock(lt);
00899 #ifdef HAVE_BKTR
00900                   __dump_backtrace(&lt->backtrace[lt->reentrancy], canlog);
00901 #endif
00902                   __ast_mutex_logger("%s line %d (%s): '%s' was locked  here.\n",
00903                         lt->file[lt->reentrancy-1], lt->lineno[lt->reentrancy-1],
00904                         lt->func[lt->reentrancy-1], name);
00905 #ifdef HAVE_BKTR
00906                   __dump_backtrace(&lt->backtrace[lt->reentrancy-1], canlog);
00907 #endif
00908                   ast_reentrancy_unlock(lt);
00909                }
00910                reported_wait = wait_time;
00911             }
00912             usleep(200);
00913          }
00914       } while (res == EBUSY);
00915    }
00916 #else /* !DETECT_DEADLOCKS || !DEBUG_THREADS */
00917    res = pthread_rwlock_rdlock(&t->lock);
00918 #endif /* !DETECT_DEADLOCKS || !DEBUG_THREADS */
00919 
00920 #ifdef DEBUG_THREADS
00921    if (!res && t->tracking) {
00922       ast_reentrancy_lock(lt);
00923       if (lt->reentrancy < AST_MAX_REENTRANCY) {
00924          lt->file[lt->reentrancy] = filename;
00925          lt->lineno[lt->reentrancy] = line;
00926          lt->func[lt->reentrancy] = func;
00927          lt->thread[lt->reentrancy] = pthread_self();
00928          lt->reentrancy++;
00929       }
00930       ast_reentrancy_unlock(lt);
00931       if (t->tracking) {
00932          ast_mark_lock_acquired(t);
00933       }
00934    } else if (t->tracking) {
00935 #ifdef HAVE_BKTR
00936       if (lt->reentrancy) {
00937          ast_reentrancy_lock(lt);
00938          bt = &lt->backtrace[lt->reentrancy-1];
00939          ast_reentrancy_unlock(lt);
00940       } else {
00941          bt = NULL;
00942       }
00943       ast_remove_lock_info(t, bt);
00944 #else
00945       ast_remove_lock_info(t);
00946 #endif
00947    }
00948 
00949    if (res) {
00950       __ast_mutex_logger("%s line %d (%s): Error obtaining read lock: %s\n",
00951             filename, line, func, strerror(res));
00952       DO_THREAD_CRASH;
00953    }
00954 #endif /* DEBUG_THREADS */
00955 
00956    return res;
00957 }
00958 
00959 int __ast_rwlock_wrlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name)
00960 {
00961    int res;
00962 
00963 #ifdef DEBUG_THREADS
00964    struct ast_lock_track *lt;
00965    int canlog = strcmp(filename, "logger.c") & t->tracking;
00966 #ifdef HAVE_BKTR
00967    struct ast_bt *bt = NULL;
00968 #endif
00969 
00970 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
00971    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00972        /* Don't warn abount uninitialized lock.
00973         * Simple try to initialize it.
00974         * May be not needed in linux system.
00975         */
00976       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
00977       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
00978          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
00979                filename, line, func, name);
00980          return res;
00981       }
00982    }
00983 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
00984 
00985    if (t->tracking && !t->track) {
00986       ast_reentrancy_init(&t->track);
00987    }
00988    lt = t->track;
00989 
00990    if (t->tracking) {
00991 #ifdef HAVE_BKTR
00992       struct ast_bt tmp;
00993 
00994       /* The implementation of backtrace() may have its own locks.
00995        * Capture the backtrace outside of the reentrancy lock to
00996        * avoid deadlocks. See ASTERISK-22455. */
00997       ast_bt_get_addresses(&tmp);
00998 
00999       ast_reentrancy_lock(lt);
01000       if (lt->reentrancy != AST_MAX_REENTRANCY) {
01001          lt->backtrace[lt->reentrancy] = tmp;
01002          bt = &lt->backtrace[lt->reentrancy];
01003       }
01004       ast_reentrancy_unlock(lt);
01005 
01006       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t, bt);
01007 #else
01008       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t);
01009 #endif
01010    }
01011 #endif /* DEBUG_THREADS */
01012 
01013 #if defined(DETECT_DEADLOCKS) && defined(DEBUG_THREADS)
01014    {
01015       time_t seconds = time(NULL);
01016       time_t wait_time, reported_wait = 0;
01017       do {
01018          res = pthread_rwlock_trywrlock(&t->lock);
01019          if (res == EBUSY) {
01020             wait_time = time(NULL) - seconds;
01021             if (wait_time > reported_wait && (wait_time % 5) == 0) {
01022                __ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for writelock '%s'?\n",
01023                   filename, line, func, (int)wait_time, name);
01024                if (t->tracking) {
01025                   ast_reentrancy_lock(lt);
01026 #ifdef HAVE_BKTR
01027                   __dump_backtrace(&lt->backtrace[lt->reentrancy], canlog);
01028 #endif
01029                   __ast_mutex_logger("%s line %d (%s): '%s' was locked  here.\n",
01030                         lt->file[lt->reentrancy-1], lt->lineno[lt->reentrancy-1],
01031                         lt->func[lt->reentrancy-1], name);
01032 #ifdef HAVE_BKTR
01033                   __dump_backtrace(&lt->backtrace[lt->reentrancy-1], canlog);
01034 #endif
01035                   ast_reentrancy_unlock(lt);
01036                }
01037                reported_wait = wait_time;
01038             }
01039             usleep(200);
01040          }
01041       } while (res == EBUSY);
01042    }
01043 #else /* !DETECT_DEADLOCKS || !DEBUG_THREADS */
01044    res = pthread_rwlock_wrlock(&t->lock);
01045 #endif /* !DETECT_DEADLOCKS || !DEBUG_THREADS */
01046 
01047 #ifdef DEBUG_THREADS
01048    if (!res && t->tracking) {
01049       ast_reentrancy_lock(lt);
01050       if (lt->reentrancy < AST_MAX_REENTRANCY) {
01051          lt->file[lt->reentrancy] = filename;
01052          lt->lineno[lt->reentrancy] = line;
01053          lt->func[lt->reentrancy] = func;
01054          lt->thread[lt->reentrancy] = pthread_self();
01055          lt->reentrancy++;
01056       }
01057       ast_reentrancy_unlock(lt);
01058       if (t->tracking) {
01059          ast_mark_lock_acquired(t);
01060       }
01061    } else if (t->tracking) {
01062 #ifdef HAVE_BKTR
01063       if (lt->reentrancy) {
01064          ast_reentrancy_lock(lt);
01065          bt = &lt->backtrace[lt->reentrancy-1];
01066          ast_reentrancy_unlock(lt);
01067       } else {
01068          bt = NULL;
01069       }
01070       if (t->tracking) {
01071          ast_remove_lock_info(t, bt);
01072       }
01073 #else
01074       if (t->tracking) {
01075          ast_remove_lock_info(t);
01076       }
01077 #endif
01078    }
01079    if (res) {
01080       __ast_mutex_logger("%s line %d (%s): Error obtaining write lock: %s\n",
01081             filename, line, func, strerror(res));
01082       DO_THREAD_CRASH;
01083    }
01084 #endif /* DEBUG_THREADS */
01085 
01086    return res;
01087 }
01088 
01089 int __ast_rwlock_timedrdlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name,
01090    const struct timespec *abs_timeout)
01091 {
01092    int res;
01093 
01094 #ifdef DEBUG_THREADS
01095    struct ast_lock_track *lt;
01096    int canlog = strcmp(filename, "logger.c") & t->tracking;
01097 #ifdef HAVE_BKTR
01098    struct ast_bt *bt = NULL;
01099 #endif
01100 
01101 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
01102    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01103        /* Don't warn abount uninitialized lock.
01104         * Simple try to initialize it.
01105         * May be not needed in linux system.
01106         */
01107       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
01108       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01109          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
01110                filename, line, func, name);
01111          return res;
01112       }
01113    }
01114 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
01115 
01116    if (t->tracking && !t->track) {
01117       ast_reentrancy_init(&t->track);
01118    }
01119    lt = t->track;
01120 
01121    if (t->tracking) {
01122 #ifdef HAVE_BKTR
01123       struct ast_bt tmp;
01124 
01125       /* The implementation of backtrace() may have its own locks.
01126        * Capture the backtrace outside of the reentrancy lock to
01127        * avoid deadlocks. See ASTERISK-22455. */
01128       ast_bt_get_addresses(&tmp);
01129 
01130       ast_reentrancy_lock(lt);
01131       if (lt->reentrancy != AST_MAX_REENTRANCY) {
01132          lt->backtrace[lt->reentrancy] = tmp;
01133          bt = &lt->backtrace[lt->reentrancy];
01134       }
01135       ast_reentrancy_unlock(lt);
01136 
01137       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t, bt);
01138 #else
01139       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t);
01140 #endif
01141    }
01142 #endif /* DEBUG_THREADS */
01143 
01144 #ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
01145    res = pthread_rwlock_timedrdlock(&t->lock, abs_timeout);
01146 #else
01147    do {
01148       struct timeval _now;
01149       for (;;) {
01150          if (!(res = pthread_rwlock_tryrdlock(&t->lock))) {
01151             break;
01152          }
01153          _now = ast_tvnow();
01154          if (_now.tv_sec > abs_timeout->tv_sec || (_now.tv_sec == abs_timeout->tv_sec && _now.tv_usec * 1000 > abs_timeout->tv_nsec)) {
01155             break;
01156          }
01157          usleep(1);
01158       }
01159    } while (0);
01160 #endif
01161 
01162 #ifdef DEBUG_THREADS
01163    if (!res && t->tracking) {
01164       ast_reentrancy_lock(lt);
01165       if (lt->reentrancy < AST_MAX_REENTRANCY) {
01166          lt->file[lt->reentrancy] = filename;
01167          lt->lineno[lt->reentrancy] = line;
01168          lt->func[lt->reentrancy] = func;
01169          lt->thread[lt->reentrancy] = pthread_self();
01170          lt->reentrancy++;
01171       }
01172       ast_reentrancy_unlock(lt);
01173       if (t->tracking) {
01174          ast_mark_lock_acquired(t);
01175       }
01176    } else if (t->tracking) {
01177 #ifdef HAVE_BKTR
01178       if (lt->reentrancy) {
01179          ast_reentrancy_lock(lt);
01180          bt = &lt->backtrace[lt->reentrancy-1];
01181          ast_reentrancy_unlock(lt);
01182       } else {
01183          bt = NULL;
01184       }
01185       ast_remove_lock_info(t, bt);
01186 #else
01187       ast_remove_lock_info(t);
01188 #endif
01189    }
01190    if (res) {
01191       __ast_mutex_logger("%s line %d (%s): Error obtaining read lock: %s\n",
01192             filename, line, func, strerror(res));
01193       DO_THREAD_CRASH;
01194    }
01195 #endif /* DEBUG_THREADS */
01196 
01197    return res;
01198 }
01199 
01200 int __ast_rwlock_timedwrlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name,
01201    const struct timespec *abs_timeout)
01202 {
01203    int res;
01204 
01205 #ifdef DEBUG_THREADS
01206    struct ast_lock_track *lt;
01207    int canlog = strcmp(filename, "logger.c") & t->tracking;
01208 #ifdef HAVE_BKTR
01209    struct ast_bt *bt = NULL;
01210 #endif
01211 
01212 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
01213    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01214        /* Don't warn abount uninitialized lock.
01215         * Simple try to initialize it.
01216         * May be not needed in linux system.
01217         */
01218       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
01219       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01220          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
01221                filename, line, func, name);
01222          return res;
01223       }
01224    }
01225 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
01226 
01227    if (t->tracking && !t->track) {
01228       ast_reentrancy_init(&t->track);
01229    }
01230    lt = t->track;
01231 
01232    if (t->tracking) {
01233 #ifdef HAVE_BKTR
01234       struct ast_bt tmp;
01235 
01236       /* The implementation of backtrace() may have its own locks.
01237        * Capture the backtrace outside of the reentrancy lock to
01238        * avoid deadlocks. See ASTERISK-22455. */
01239       ast_bt_get_addresses(&tmp);
01240 
01241       ast_reentrancy_lock(lt);
01242       if (lt->reentrancy != AST_MAX_REENTRANCY) {
01243          lt->backtrace[lt->reentrancy] = tmp;
01244          bt = &lt->backtrace[lt->reentrancy];
01245       }
01246       ast_reentrancy_unlock(lt);
01247 
01248       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t, bt);
01249 #else
01250       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t);
01251 #endif
01252    }
01253 #endif /* DEBUG_THREADS */
01254 
01255 #ifdef HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK
01256    res = pthread_rwlock_timedwrlock(&t->lock, abs_timeout);
01257 #else
01258    do {
01259       struct timeval _now;
01260       for (;;) {
01261          if (!(res = pthread_rwlock_trywrlock(&t->lock))) {
01262             break;
01263          }
01264          _now = ast_tvnow();
01265          if (_now.tv_sec > abs_timeout->tv_sec || (_now.tv_sec == abs_timeout->tv_sec && _now.tv_usec * 1000 > abs_timeout->tv_nsec)) {
01266             break;
01267          }
01268          usleep(1);
01269       }
01270    } while (0);
01271 #endif
01272 
01273 #ifdef DEBUG_THREADS
01274    if (!res && t->tracking) {
01275       ast_reentrancy_lock(lt);
01276       if (lt->reentrancy < AST_MAX_REENTRANCY) {
01277          lt->file[lt->reentrancy] = filename;
01278          lt->lineno[lt->reentrancy] = line;
01279          lt->func[lt->reentrancy] = func;
01280          lt->thread[lt->reentrancy] = pthread_self();
01281          lt->reentrancy++;
01282       }
01283       ast_reentrancy_unlock(lt);
01284       if (t->tracking) {
01285          ast_mark_lock_acquired(t);
01286       }
01287    } else if (t->tracking) {
01288 #ifdef HAVE_BKTR
01289       if (lt->reentrancy) {
01290          ast_reentrancy_lock(lt);
01291          bt = &lt->backtrace[lt->reentrancy-1];
01292          ast_reentrancy_unlock(lt);
01293       } else {
01294          bt = NULL;
01295       }
01296       if (t->tracking) {
01297          ast_remove_lock_info(t, bt);
01298       }
01299 #else
01300       if (t->tracking) {
01301          ast_remove_lock_info(t);
01302       }
01303 #endif
01304    }
01305    if (res) {
01306       __ast_mutex_logger("%s line %d (%s): Error obtaining read lock: %s\n",
01307             filename, line, func, strerror(res));
01308       DO_THREAD_CRASH;
01309    }
01310 #endif /* DEBUG_THREADS */
01311 
01312    return res;
01313 }
01314 
01315 int __ast_rwlock_tryrdlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name)
01316 {
01317    int res;
01318 
01319 #ifdef DEBUG_THREADS
01320    struct ast_lock_track *lt;
01321 #ifdef HAVE_BKTR
01322    struct ast_bt *bt = NULL;
01323 #endif
01324 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
01325    int canlog = strcmp(filename, "logger.c") & t->tracking;
01326 
01327    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01328        /* Don't warn abount uninitialized lock.
01329         * Simple try to initialize it.
01330         * May be not needed in linux system.
01331         */
01332       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
01333       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01334          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
01335                filename, line, func, name);
01336          return res;
01337       }
01338    }
01339 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
01340 
01341    if (t->tracking && !t->track) {
01342       ast_reentrancy_init(&t->track);
01343    }
01344    lt = t->track;
01345 
01346    if (t->tracking) {
01347 #ifdef HAVE_BKTR
01348       struct ast_bt tmp;
01349 
01350       /* The implementation of backtrace() may have its own locks.
01351        * Capture the backtrace outside of the reentrancy lock to
01352        * avoid deadlocks. See ASTERISK-22455. */
01353       ast_bt_get_addresses(&tmp);
01354 
01355       ast_reentrancy_lock(lt);
01356       if (lt->reentrancy != AST_MAX_REENTRANCY) {
01357          lt->backtrace[lt->reentrancy] = tmp;
01358          bt = &lt->backtrace[lt->reentrancy];
01359       }
01360       ast_reentrancy_unlock(lt);
01361 
01362       ast_store_lock_info(AST_RDLOCK, filename, line, func, name, t, bt);
01363 #else
01364       ast_store_lock_info(AST_RDLOCK, filename, line, func, name, t);
01365 #endif
01366    }
01367 #endif /* DEBUG_THREADS */
01368 
01369    res = pthread_rwlock_tryrdlock(&t->lock);
01370 
01371 #ifdef DEBUG_THREADS
01372    if (!res && t->tracking) {
01373       ast_reentrancy_lock(lt);
01374       if (lt->reentrancy < AST_MAX_REENTRANCY) {
01375          lt->file[lt->reentrancy] = filename;
01376          lt->lineno[lt->reentrancy] = line;
01377          lt->func[lt->reentrancy] = func;
01378          lt->thread[lt->reentrancy] = pthread_self();
01379          lt->reentrancy++;
01380       }
01381       ast_reentrancy_unlock(lt);
01382       if (t->tracking) {
01383          ast_mark_lock_acquired(t);
01384       }
01385    } else if (t->tracking) {
01386       ast_mark_lock_failed(t);
01387    }
01388 #endif /* DEBUG_THREADS */
01389 
01390    return res;
01391 }
01392 
01393 int __ast_rwlock_trywrlock(const char *filename, int line, const char *func, ast_rwlock_t *t, const char *name)
01394 {
01395    int res;
01396 
01397 #ifdef DEBUG_THREADS
01398    struct ast_lock_track *lt;
01399 #ifdef HAVE_BKTR
01400    struct ast_bt *bt = NULL;
01401 #endif
01402 #if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
01403    int canlog = strcmp(filename, "logger.c") & t->tracking;
01404 
01405    if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01406        /* Don't warn abount uninitialized lock.
01407         * Simple try to initialize it.
01408         * May be not needed in linux system.
01409         */
01410       res = __ast_rwlock_init(t->tracking, filename, line, func, name, t);
01411       if ((t->lock) == ((pthread_rwlock_t) __AST_RWLOCK_INIT_VALUE)) {
01412          __ast_mutex_logger("%s line %d (%s): Error: rwlock '%s' is uninitialized and unable to initialize.\n",
01413                filename, line, func, name);
01414          return res;
01415       }
01416    }
01417 #endif /* AST_MUTEX_INIT_W_CONSTRUCTORS */
01418 
01419    if (t->tracking && !t->track) {
01420       ast_reentrancy_init(&t->track);
01421    }
01422    lt = t->track;
01423 
01424    if (t->tracking) {
01425 #ifdef HAVE_BKTR
01426       struct ast_bt tmp;
01427 
01428       /* The implementation of backtrace() may have its own locks.
01429        * Capture the backtrace outside of the reentrancy lock to
01430        * avoid deadlocks. See ASTERISK-22455. */
01431       ast_bt_get_addresses(&tmp);
01432 
01433       ast_reentrancy_lock(lt);
01434       if (lt->reentrancy != AST_MAX_REENTRANCY) {
01435          lt->backtrace[lt->reentrancy] = tmp;
01436          bt = &lt->backtrace[lt->reentrancy];
01437       }
01438       ast_reentrancy_unlock(lt);
01439 
01440       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t, bt);
01441 #else
01442       ast_store_lock_info(AST_WRLOCK, filename, line, func, name, t);
01443 #endif
01444    }
01445 #endif /* DEBUG_THREADS */
01446 
01447    res = pthread_rwlock_trywrlock(&t->lock);
01448 
01449 #ifdef DEBUG_THREADS
01450    if (!res && t->tracking) {
01451       ast_reentrancy_lock(lt);
01452       if (lt->reentrancy < AST_MAX_REENTRANCY) {
01453          lt->file[lt->reentrancy] = filename;
01454          lt->lineno[lt->reentrancy] = line;
01455          lt->func[lt->reentrancy] = func;
01456          lt->thread[lt->reentrancy] = pthread_self();
01457          lt->reentrancy++;
01458       }
01459       ast_reentrancy_unlock(lt);
01460       ast_mark_lock_acquired(t);
01461    } else if (t->tracking) {
01462       ast_mark_lock_failed(t);
01463    }
01464 #endif /* DEBUG_THREADS */
01465 
01466    return res;
01467 }

Generated on 17 Aug 2018 for Asterisk - The Open Source Telephony Project by  doxygen 1.6.1