mutex.h revision 70e5a7403f0e0a3bd292b8287c5fed5772c15270
/*
* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1998-2002 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.h,v 1.30 2007/06/19 23:47:18 tbox Exp $ */
#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);
isc_result_t
isc_mutex_init_errcheck(isc_mutex_t *mp);
#endif /* ISC_MUTEX_PROFILE */
ISC_LANG_ENDDECLS
#endif /* ISC_MUTEX_H */