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//
// Mutex_POSIX.cpp
//
// Library: Foundation
// Package: Threading
// Module: Mutex
//
// Copyright (c) 2004-2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Mutex_POSIX.h"
#include "Poco/Timestamp.h"
#if !defined(POCO_NO_SYS_SELECT_H)
#include <sys/select.h>
#endif
#include <unistd.h>
#if defined(POCO_VXWORKS)
#error #include <timers.h>
#include <cstring>
#else
#include <sys/time.h>
#endif
#if defined(_POSIX_TIMEOUTS) && (_POSIX_TIMEOUTS - 200112L) >= 0L
#if defined(_POSIX_THREADS) && (_POSIX_THREADS - 200112L) >= 0L
#define POCO_HAVE_MUTEX_TIMEOUT
#endif
#endif
#ifndef POCO_HAVE_CLOCK_GETTIME
#if (defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)) || defined(POCO_VXWORKS) || defined(__QNX__)
#ifndef __APPLE__ // See GitHub issue #1453 - not available before Mac OS 10.12/iOS 10
#define POCO_HAVE_CLOCK_GETTIME
#endif
#endif
#endif
namespace Poco {
MutexImpl::MutexImpl()
{
#if defined(POCO_VXWORKS)
// This workaround is for VxWorks 5.x where
// pthread_mutex_init() won't properly initialize the mutex
// resulting in a subsequent freeze in pthread_mutex_destroy()
// if the mutex has never been used.
std::memset(&_mutex, 0, sizeof(_mutex));
#endif
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
#if defined(PTHREAD_MUTEX_RECURSIVE_NP)
pthread_mutexattr_settype_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
#elif !defined(POCO_VXWORKS)
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
#endif
if (pthread_mutex_init(&_mutex, &attr))
{
pthread_mutexattr_destroy(&attr);
throw SystemException("cannot create mutex");
}
pthread_mutexattr_destroy(&attr);
}
MutexImpl::MutexImpl(bool fast)
{
#if defined(POCO_VXWORKS)
// This workaround is for VxWorks 5.x where
// pthread_mutex_init() won't properly initialize the mutex
// resulting in a subsequent freeze in pthread_mutex_destroy()
// if the mutex has never been used.
std::memset(&_mutex, 0, sizeof(_mutex));
#endif
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
#if defined(PTHREAD_MUTEX_RECURSIVE_NP)
pthread_mutexattr_settype_np(&attr, fast ? PTHREAD_MUTEX_NORMAL_NP : PTHREAD_MUTEX_RECURSIVE_NP);
#elif !defined(POCO_VXWORKS)
pthread_mutexattr_settype(&attr, fast ? PTHREAD_MUTEX_NORMAL : PTHREAD_MUTEX_RECURSIVE);
#endif
if (pthread_mutex_init(&_mutex, &attr))
{
pthread_mutexattr_destroy(&attr);
throw SystemException("cannot create mutex");
}
pthread_mutexattr_destroy(&attr);
}
MutexImpl::~MutexImpl()
{
pthread_mutex_destroy(&_mutex);
}
bool MutexImpl::tryLockImpl(long milliseconds)
{
#if defined(POCO_HAVE_MUTEX_TIMEOUT)
struct timespec abstime;
#if defined(POCO_HAVE_CLOCK_GETTIME)
clock_gettime(CLOCK_REALTIME, &abstime);
abstime.tv_sec += milliseconds / 1000;
abstime.tv_nsec += (milliseconds % 1000)*1000000;
if (abstime.tv_nsec >= 1000000000)
{
abstime.tv_nsec -= 1000000000;
abstime.tv_sec++;
}
#else
struct timeval tv;
gettimeofday(&tv, NULL);
abstime.tv_sec = tv.tv_sec + milliseconds / 1000;
abstime.tv_nsec = tv.tv_usec*1000 + (milliseconds % 1000)*1000000;
if (abstime.tv_nsec >= 1000000000)
{
abstime.tv_nsec -= 1000000000;
abstime.tv_sec++;
}
#endif
int rc = pthread_mutex_timedlock(&_mutex, &abstime);
if (rc == 0)
return true;
else if (rc == ETIMEDOUT)
return false;
else
throw SystemException("cannot lock mutex");
#else
const int sleepMillis = 5;
Timestamp now;
Timestamp::TimeDiff diff(Timestamp::TimeDiff(milliseconds)*1000);
do
{
int rc = pthread_mutex_trylock(&_mutex);
if (rc == 0)
return true;
else if (rc != EBUSY)
throw SystemException("cannot lock mutex");
#if defined(POCO_VXWORKS)
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = sleepMillis*1000000;
nanosleep(&ts, NULL);
#else
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = sleepMillis * 1000;
select(0, NULL, NULL, NULL, &tv);
#endif
}
while (!now.isElapsed(diff));
return false;
#endif
}
FastMutexImpl::FastMutexImpl(): MutexImpl(true)
{
}
FastMutexImpl::~FastMutexImpl()
{
}
} // namespace Poco
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