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/* This file is part of the YAZ toolkit.
* Copyright (C) Index Data.
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Index Data nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file mutex.h
* \brief Header for Mutex functions
*/
#ifndef YAZ_MUTEX_H
#define YAZ_MUTEX_H
#include <stddef.h>
#include <time.h>
#include <yaz/yconfig.h>
YAZ_BEGIN_CDECL
/** \brief YAZ MUTEX opaque pointer */
typedef struct yaz_mutex *YAZ_MUTEX;
/** \brief YAZ condition opaque pointer */
typedef struct yaz_cond *YAZ_COND;
/** \brief create MUTEX
\param mutexp is pointer to MUTEX handle (*mutexp must be NULL)
It is important that *mutexp is NULL. If not, yaz_mutex_create will
not modify the handle (assumes it is already created!)
*/
YAZ_EXPORT void yaz_mutex_create(YAZ_MUTEX *mutexp);
/** \brief enter critical section / AKA lock
\param mutex MUTEX handle
*/
YAZ_EXPORT void yaz_mutex_enter(YAZ_MUTEX mutex);
/** \brief leave critical section / AKA unlock
\param mutex MUTEX handle
*/
YAZ_EXPORT void yaz_mutex_leave(YAZ_MUTEX mutex);
/** \brief destroy MUTEX
\param mutexp pointer to MUTEX handle
If *mutexp is NULL, then this function does nothing.
*/
YAZ_EXPORT void yaz_mutex_destroy(YAZ_MUTEX *mutexp);
/** \brief sets name of MUTEX for debugging purposes
\param mutex MUTEX handle
\param log_level YAZ log level
\param name user-given name associated with MUTEX
If log_level != 0 and name != 0 this function will make yaz_mutex_enter
and yaz_mutex_leave print information for each invocation using yaz_log
with the level given. In particular when YAZ is compiled with pthreads,
yaz_mutex_enter will inform if a lock is not immediately acquired.
This function should be called after a MUTEX is created but before
it is used for locking.
*/
YAZ_EXPORT
void yaz_mutex_set_name(YAZ_MUTEX mutex, int log_level, const char *name);
/** \brief creates condition variable
\param p reference to condition handle
Upon successful completion *p holds the condition handle; *p = 0
on error.
*/
YAZ_EXPORT void yaz_cond_create(YAZ_COND *p);
/** \brief destroys condition variable
\param p reference to condition handle
Upon completion *p holds 0.
*/
YAZ_EXPORT
void yaz_cond_destroy(YAZ_COND *p);
struct timeval;
/** \brief waits for condition
\param p condition variable handle
\param m mutex
\param abstime wait until this time; 0 for indefinite wait
Semantics like pthread_cond_wait.
*/
YAZ_EXPORT
int yaz_cond_wait(YAZ_COND p, YAZ_MUTEX m, const struct timeval *abstime);
/** \brief unblock one thread waiting for block
\param p condition variable handle
*/
YAZ_EXPORT
int yaz_cond_signal(YAZ_COND p);
/** \brief unblock all threads waiting for block
\param p condition variable handle
*/
YAZ_EXPORT
int yaz_cond_broadcast(YAZ_COND p);
YAZ_END_CDECL
#endif
/*
* Local variables:
* c-basic-offset: 4
* c-file-style: "Stroustrup"
* indent-tabs-mode: nil
* End:
* vim: shiftwidth=4 tabstop=8 expandtab
*/