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condition.c
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mutex.c
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thread.c
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Editing: mutex.c
/* * Copyright (C) 2004, 2005, 2007, 2008, 2011, 2012 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 2000-2002 Internet Software Consortium. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* $Id: mutex.c,v 1.18 2011/01/04 23:47:14 tbox Exp $ */ /*! \file */ #include <config.h> #include <stdio.h> #include <time.h> #include <sys/time.h> #include <errno.h> #include <isc/mutex.h> #include <isc/util.h> #include <isc/strerror.h> #if HAVE_PTHREADS < 5 /* HP-UX 10.20 has 4, needs this */ # define pthread_mutex_init(m, a) \ pthread_mutex_init(m, (a) \ ? *(const pthread_mutexattr_t *)(a) \ : pthread_mutexattr_default) # define PTHREAD_MUTEX_RECURSIVE MUTEX_RECURSIVE_NP # define pthread_mutexattr_settype pthread_mutexattr_setkind_np #endif #if ISC_MUTEX_PROFILE /*@{*/ /*% Operations on timevals; adapted from FreeBSD's sys/time.h */ #define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) #define timevaladd(vvp, uvp) \ do { \ (vvp)->tv_sec += (uvp)->tv_sec; \ (vvp)->tv_usec += (uvp)->tv_usec; \ if ((vvp)->tv_usec >= 1000000) { \ (vvp)->tv_sec++; \ (vvp)->tv_usec -= 1000000; \ } \ } while (0) #define timevalsub(vvp, uvp) \ do { \ (vvp)->tv_sec -= (uvp)->tv_sec; \ (vvp)->tv_usec -= (uvp)->tv_usec; \ if ((vvp)->tv_usec < 0) { \ (vvp)->tv_sec--; \ (vvp)->tv_usec += 1000000; \ } \ } while (0) /*@}*/ #define ISC_MUTEX_MAX_LOCKERS 32 typedef struct { const char * file; int line; unsigned count; struct timeval locked_total; struct timeval wait_total; } isc_mutexlocker_t; struct isc_mutexstats { const char * file; /*%< File mutex was created in. */ int line; /*%< Line mutex was created on. */ unsigned count; struct timeval lock_t; struct timeval locked_total; struct timeval wait_total; isc_mutexlocker_t * cur_locker; isc_mutexlocker_t lockers[ISC_MUTEX_MAX_LOCKERS]; }; #ifndef ISC_MUTEX_PROFTABLESIZE #define ISC_MUTEX_PROFTABLESIZE (1024 * 1024) #endif static isc_mutexstats_t stats[ISC_MUTEX_PROFTABLESIZE]; static int stats_next = 0; static isc_boolean_t stats_init = ISC_FALSE; static pthread_mutex_t statslock = PTHREAD_MUTEX_INITIALIZER; isc_result_t isc_mutex_init_profile(isc_mutex_t *mp, const char *file, int line) { int i, err; err = pthread_mutex_init(&mp->mutex, NULL); if (err == ENOMEM) return (ISC_R_NOMEMORY); if (err != 0) return (ISC_R_UNEXPECTED); RUNTIME_CHECK(pthread_mutex_lock(&statslock) == 0); if (stats_init == ISC_FALSE) stats_init = ISC_TRUE; /* * If all statistics entries have been used, give up and trigger an * assertion failure. There would be no other way to deal with this * because we'd like to keep record of all locks for the purpose of * debugging and the number of necessary locks is unpredictable. * If this failure is triggered while debugging, named should be * rebuilt with an increased ISC_MUTEX_PROFTABLESIZE. */ RUNTIME_CHECK(stats_next < ISC_MUTEX_PROFTABLESIZE); mp->stats = &stats[stats_next++]; RUNTIME_CHECK(pthread_mutex_unlock(&statslock) == 0); mp->stats->file = file; mp->stats->line = line; mp->stats->count = 0; timevalclear(&mp->stats->locked_total); timevalclear(&mp->stats->wait_total); for (i = 0; i < ISC_MUTEX_MAX_LOCKERS; i++) { mp->stats->lockers[i].file = NULL; mp->stats->lockers[i].line = 0; mp->stats->lockers[i].count = 0; timevalclear(&mp->stats->lockers[i].locked_total); timevalclear(&mp->stats->lockers[i].wait_total); } return (ISC_R_SUCCESS); } isc_result_t isc_mutex_lock_profile(isc_mutex_t *mp, const char *file, int line) { struct timeval prelock_t; struct timeval postlock_t; isc_mutexlocker_t *locker = NULL; int i; gettimeofday(&prelock_t, NULL); if (pthread_mutex_lock(&mp->mutex) != 0) return (ISC_R_UNEXPECTED); gettimeofday(&postlock_t, NULL); mp->stats->lock_t = postlock_t; timevalsub(&postlock_t, &prelock_t); mp->stats->count++; timevaladd(&mp->stats->wait_total, &postlock_t); for (i = 0; i < ISC_MUTEX_MAX_LOCKERS; i++) { if (mp->stats->lockers[i].file == NULL) { locker = &mp->stats->lockers[i]; locker->file = file; locker->line = line; break; } else if (mp->stats->lockers[i].file == file && mp->stats->lockers[i].line == line) { locker = &mp->stats->lockers[i]; break; } } if (locker != NULL) { locker->count++; timevaladd(&locker->wait_total, &postlock_t); } mp->stats->cur_locker = locker; return (ISC_R_SUCCESS); } isc_result_t isc_mutex_unlock_profile(isc_mutex_t *mp, const char *file, int line) { struct timeval unlock_t; UNUSED(file); UNUSED(line); if (mp->stats->cur_locker != NULL) { gettimeofday(&unlock_t, NULL); timevalsub(&unlock_t, &mp->stats->lock_t); timevaladd(&mp->stats->locked_total, &unlock_t); timevaladd(&mp->stats->cur_locker->locked_total, &unlock_t); mp->stats->cur_locker = NULL; } return ((pthread_mutex_unlock((&mp->mutex)) == 0) ? \ ISC_R_SUCCESS : ISC_R_UNEXPECTED); } void isc_mutex_statsprofile(FILE *fp) { isc_mutexlocker_t *locker; int i, j; fprintf(fp, "Mutex stats (in us)\n"); for (i = 0; i < stats_next; i++) { fprintf(fp, "%-12s %4d: %10u %lu.%06lu %lu.%06lu %5d\n", stats[i].file, stats[i].line, stats[i].count, stats[i].locked_total.tv_sec, stats[i].locked_total.tv_usec, stats[i].wait_total.tv_sec, stats[i].wait_total.tv_usec, i); for (j = 0; j < ISC_MUTEX_MAX_LOCKERS; j++) { locker = &stats[i].lockers[j]; if (locker->file == NULL) continue; fprintf(fp, " %-11s %4d: %10u %lu.%06lu %lu.%06lu %5d\n", locker->file, locker->line, locker->count, locker->locked_total.tv_sec, locker->locked_total.tv_usec, locker->wait_total.tv_sec, locker->wait_total.tv_usec, i); } } } #endif /* ISC_MUTEX_PROFILE */ #if ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK) isc_result_t isc_mutex_init_errcheck(isc_mutex_t *mp) { pthread_mutexattr_t attr; int err; if (pthread_mutexattr_init(&attr) != 0) return (ISC_R_UNEXPECTED); if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK) != 0) { pthread_mutexattr_destroy(&attr); return (ISC_R_UNEXPECTED); } err = pthread_mutex_init(mp, &attr) != 0) pthread_mutexattr_destroy(&attr); if (err == ENOMEM) return (ISC_R_NOMEMORY); return ((err == 0) ? ISC_R_SUCCESS : ISC_R_UNEXPECTED); } #endif #if ISC_MUTEX_DEBUG && defined(__NetBSD__) && defined(PTHREAD_MUTEX_ERRORCHECK) pthread_mutexattr_t isc__mutex_attrs = { PTHREAD_MUTEX_ERRORCHECK, /* m_type */ 0 /* m_flags, which appears to be unused. */ }; #endif #if !(ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)) && !ISC_MUTEX_PROFILE isc_result_t isc__mutex_init(isc_mutex_t *mp, const char *file, unsigned int line) { char strbuf[ISC_STRERRORSIZE]; isc_result_t result = ISC_R_SUCCESS; int err; err = pthread_mutex_init(mp, ISC__MUTEX_ATTRS); if (err == ENOMEM) return (ISC_R_NOMEMORY); if (err != 0) { isc__strerror(errno, strbuf, sizeof(strbuf)); UNEXPECTED_ERROR(file, line, "isc_mutex_init() failed: %s", strbuf); result = ISC_R_UNEXPECTED; } return (result); } #endif
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