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/* Copyright (C) 2008 PrimeBase Technologies GmbH, Germany
*
* PrimeBase Media Stream for MySQL
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Original author: Paul McCullagh (H&G2JCtL)
* Continued development: Barry Leslie
*
* 2007-06-06
*
* A basic mutex (mutual exclusion) object.
*
*/
#include "CSConfig.h"
#include <assert.h>
#ifdef OS_WINDOWS
extern int gettimeofday(struct timeval *tv, struct timezone *tz);
#else
#include <sys/time.h>
#endif
#include "CSException.h"
#include "CSMutex.h"
#include "CSGlobal.h"
#include "CSLog.h"
/*
* ---------------------------------------------------------------
* A MUTEX ENTITY
*/
CSMutex::CSMutex()
#ifdef DEBUG
:
iLocker(NULL),
trace(false)
#endif
{
int err;
if ((err = pthread_mutex_init(&iMutex, NULL)))
CSException::throwOSError(CS_CONTEXT, err);
}
CSMutex::~CSMutex()
{
pthread_mutex_destroy(&iMutex);
}
void CSMutex::lock()
{
int err;
if ((err = pthread_mutex_lock(&iMutex)))
CSException::throwOSError(CS_CONTEXT, err);
#ifdef DEBUG
iLocker = CSThread::getSelf();
if (trace)
CSL.logf(iLocker, CSLog::Protocol, "Mutex locked\n");
#endif
}
void CSMutex::unlock()
{
#ifdef DEBUG
if (trace)
CSL.logf(iLocker, CSLog::Protocol, "Mutex unlocked\n");
iLocker = NULL;
#endif
pthread_mutex_unlock(&iMutex);
}
/*
* ---------------------------------------------------------------
* A LOCK ENTITY
*/
CSLock::CSLock():
CSMutex(),
iLockingThread(NULL),
iLockCount(0)
{
}
CSLock::~CSLock()
{
}
void CSLock::lock()
{
int err;
enter_();
if (iLockingThread != self) {
if ((err = pthread_mutex_lock(&iMutex)))
CSException::throwOSError(CS_CONTEXT, err);
iLockingThread = self;
}
iLockCount++;
exit_();
}
void CSLock::unlock()
{
enter_();
ASSERT(iLockingThread == self);
if (!(--iLockCount)) {
iLockingThread = NULL;
pthread_mutex_unlock(&iMutex);
}
exit_();
}
bool CSLock::haveLock()
{
enter_();
return_(iLockingThread == self);
}
/*
* ---------------------------------------------------------------
* A SYNCRONISATION ENTITY
*/
CSSync::CSSync():
CSLock()
{
int err;
if ((err = pthread_cond_init(&iCondition, NULL)))
CSException::throwOSError(CS_CONTEXT, err);
}
CSSync::~CSSync()
{
pthread_cond_destroy(&iCondition);
}
void CSSync::wait()
{
int err;
int lock_count;
enter_();
ASSERT(iLockingThread == self);
lock_count = iLockCount;
iLockCount = 0;
iLockingThread = NULL;
err = pthread_cond_wait(&iCondition, &iMutex);
iLockCount = lock_count;
iLockingThread = self;
if (err)
CSException::throwOSError(CS_CONTEXT, err);
exit_();
}
void CSSync::wait(time_t milli_sec)
{
struct timespec abstime;
int lock_count;
int err;
uint64_t micro_sec;
enter_();
struct timeval now;
/* Get the current time in microseconds: */
gettimeofday(&now, NULL);
micro_sec = (uint64_t) now.tv_sec * (uint64_t) 1000000 + (uint64_t) now.tv_usec;
/* Add the timeout which is in milli seconds */
micro_sec += (uint64_t) milli_sec * (uint64_t) 1000;
/* Setup the end time, which is in nano-seconds. */
abstime.tv_sec = (long) (micro_sec / 1000000); /* seconds */
abstime.tv_nsec = (long) ((micro_sec % 1000000) * 1000); /* and nanoseconds */
ASSERT(iLockingThread == self);
lock_count = iLockCount;
iLockCount = 0;
iLockingThread = NULL;
err = pthread_cond_timedwait(&iCondition, &iMutex, &abstime);
iLockCount = lock_count;
iLockingThread = self;
if (err && err != ETIMEDOUT)
CSException::throwOSError(CS_CONTEXT, err);
exit_();
}
void CSSync::wakeup()
{
int err;
if ((err = pthread_cond_broadcast(&iCondition)))
CSException::throwOSError(CS_CONTEXT, err);
}
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