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mutex.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_MUTEX_H #define ISC_MUTEX_H 1 /*! \file */ #include <pthread.h> #include <stdio.h> #include <isc/lang.h> #include <isc/result.h> /* for ISC_R_ codes */ ISC_LANG_BEGINDECLS /*! * Supply mutex attributes that enable deadlock detection * (helpful when debugging). This is system dependent and * currently only supported on NetBSD. */ #if ISC_MUTEX_DEBUG && defined(__NetBSD__) && defined(PTHREAD_MUTEX_ERRORCHECK) extern pthread_mutexattr_t isc__mutex_attrs; #define ISC__MUTEX_ATTRS &isc__mutex_attrs #else #define ISC__MUTEX_ATTRS NULL #endif /* XXX We could do fancier error handling... */ /*! * Define ISC_MUTEX_PROFILE to turn on profiling of mutexes by line. When * enabled, isc_mutex_stats() can be used to print a table showing the * number of times each type of mutex was locked and the amount of time * waiting to obtain the lock. */ #ifndef ISC_MUTEX_PROFILE #define ISC_MUTEX_PROFILE 0 #endif #if ISC_MUTEX_PROFILE typedef struct isc_mutexstats isc_mutexstats_t; typedef struct { pthread_mutex_t mutex; /*%< The actual mutex. */ isc_mutexstats_t * stats; /*%< Mutex statistics. */ } isc_mutex_t; #else typedef pthread_mutex_t isc_mutex_t; #endif #if ISC_MUTEX_PROFILE #define isc_mutex_init(mp) \ isc_mutex_init_profile((mp), __FILE__, __LINE__) #else #if ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK) #define isc_mutex_init(mp) \ isc_mutex_init_errcheck((mp)) #else #define isc_mutex_init(mp) \ isc__mutex_init((mp), __FILE__, __LINE__) isc_result_t isc__mutex_init(isc_mutex_t *mp, const char *file, unsigned int line); #endif #endif #if ISC_MUTEX_PROFILE #define isc_mutex_lock(mp) \ isc_mutex_lock_profile((mp), __FILE__, __LINE__) #else #define isc_mutex_lock(mp) \ ((pthread_mutex_lock((mp)) == 0) ? \ ISC_R_SUCCESS : ISC_R_UNEXPECTED) #endif #if ISC_MUTEX_PROFILE #define isc_mutex_unlock(mp) \ isc_mutex_unlock_profile((mp), __FILE__, __LINE__) #else #define isc_mutex_unlock(mp) \ ((pthread_mutex_unlock((mp)) == 0) ? \ ISC_R_SUCCESS : ISC_R_UNEXPECTED) #endif #if ISC_MUTEX_PROFILE #define isc_mutex_trylock(mp) \ ((pthread_mutex_trylock((&(mp)->mutex)) == 0) ? \ ISC_R_SUCCESS : ISC_R_LOCKBUSY) #else #define isc_mutex_trylock(mp) \ ((pthread_mutex_trylock((mp)) == 0) ? \ ISC_R_SUCCESS : ISC_R_LOCKBUSY) #endif #if ISC_MUTEX_PROFILE #define isc_mutex_destroy(mp) \ ((pthread_mutex_destroy((&(mp)->mutex)) == 0) ? \ ISC_R_SUCCESS : ISC_R_UNEXPECTED) #else #define isc_mutex_destroy(mp) \ ((pthread_mutex_destroy((mp)) == 0) ? \ ISC_R_SUCCESS : ISC_R_UNEXPECTED) #endif #if ISC_MUTEX_PROFILE #define isc_mutex_stats(fp) isc_mutex_statsprofile(fp); #else #define isc_mutex_stats(fp) #endif #if ISC_MUTEX_PROFILE isc_result_t isc_mutex_init_profile(isc_mutex_t *mp, const char * _file, int _line); isc_result_t isc_mutex_lock_profile(isc_mutex_t *mp, const char * _file, int _line); isc_result_t isc_mutex_unlock_profile(isc_mutex_t *mp, const char * _file, int _line); void isc_mutex_statsprofile(FILE *fp); #endif /* ISC_MUTEX_PROFILE */ isc_result_t isc_mutex_init_errcheck(isc_mutex_t *mp); ISC_LANG_ENDDECLS #endif /* ISC_MUTEX_H */
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