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/*
* Copyright (C) 2015 by Multi-Tech Systems
*
* This file is part of libmts.
*
* libmts is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* libmts 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libmts. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <mts/MTS_Lock.h>
#include <mts/MTS_Logger.h>
#include <cassert>
#include <stdexcept>
using namespace MTS;
Lock::Lock()
: m_bLocked(false) {
#ifdef WIN32
m_apMutex.reset(CreateMutex(NULL, FALSE, NULL));
if (m_apMutex.get() == NULL) {
throw std::bad_alloc();
}
#else
m_apMutexAttr.reset(new pthread_mutexattr_t());
int result = pthread_mutexattr_init(m_apMutexAttr.get());
if (result != 0) {
throw std::runtime_error("failed to initialize mutex attributes");
}
result = pthread_mutexattr_settype(m_apMutexAttr.get(),
PTHREAD_MUTEX_RECURSIVE);
if (result != 0) {
throw std::runtime_error("failed to set mutex recursive");
}
m_apMutex.reset(new pthread_mutex_t());
result = pthread_mutex_init(m_apMutex.get(), m_apMutexAttr.get());
if (result != 0) {
throw std::runtime_error("failed to initialize mutex");
}
#endif
}
Lock::~Lock() {
if (isLocked()) {
unlock();
}
#ifdef WIN32
const BOOL ok = CloseHandle(m_apMutex.release());
assert(ok);
#else
if (!m_apMutex.isNull()) {
const int result = pthread_mutex_destroy(m_apMutex.get());
if (result != 0) {
printWarning("Lock| Failed to destroy mutex");
}
assert(result == 0);
}
if (!m_apMutexAttr.isNull()) {
const int result = pthread_mutexattr_destroy(m_apMutexAttr.get());
if (result != 0) {
printWarning("Lock| Failed to destroy mutex attributes");
}
assert(result == 0);
}
#endif
}
void Lock::lock() {
#ifdef WIN32
const DWORD waitResult = WaitForSingleObject(m_apMutex.get(), INFINITE);
assert(waitResult == WAIT_OBJECT_0);
#else
const int result = pthread_mutex_lock(m_apMutex.get());
if (result != 0) {
printWarning("Lock| Failed to lock mutex");
}
assert(result == 0);
#endif
m_bLocked = true;
}
void Lock::unlock() {
m_bLocked = false;
#ifdef WIN32
const BOOL ok = ReleaseMutex(m_apMutex.get());
assert(ok);
#else
const int result = pthread_mutex_unlock(m_apMutex.get());
if (result != 0) {
printWarning("Lock| Failed to unlock mutex");
}
assert(result == 0);
#endif
}
bool Lock::isLocked() const {
return m_bLocked;
}
Condition* Lock::createCondition() {
return new Condition(this);
}
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