123 lines
2.7 KiB
C++
123 lines
2.7 KiB
C++
/*
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PIP - Platform Independent Primitives
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Mutex
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Ivan Pelipenko peri4ko@yandex.ru, Stephan Fomenko, Andrey Bychkov work.a.b@yandex.ru
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \class PIMutex
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* \brief Mutex
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* \details
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* \section PIMutex_sec0 Synopsis
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* %PIMutex provides synchronization blocks between several threads.
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* Using mutex guarantees execution of some code only one of threads.
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* Mutex contains logic state and functions to change it: \a lock(),
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* \a unlock() and \a tryLock().
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*
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* \section PIMutex_sec1 Usage
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* Block of code that should to be executed only one thread simultaniously
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* should to be started with \a lock() and ended with \a unlock().
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* \snippet pimutex.cpp main
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* "mutex" in this example is one for all threads.
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*
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* */
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#include "pimutex.h"
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#include "piincludes_p.h"
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#ifdef WINDOWS
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# include <synchapi.h>
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#else
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# include <pthread.h>
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#endif
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PRIVATE_DEFINITION_START(PIMutex)
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#ifdef WINDOWS
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CRITICAL_SECTION
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#else
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pthread_mutex_t
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#endif
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mutex;
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PRIVATE_DEFINITION_END(PIMutex)
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PIMutex::PIMutex() {
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init();
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}
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PIMutex::~PIMutex() {
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destroy();
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}
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void PIMutex::lock() {
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#ifdef WINDOWS
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EnterCriticalSection(&(PRIVATE->mutex));
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#else
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pthread_mutex_lock(&(PRIVATE->mutex));
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#endif
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}
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void PIMutex::unlock() {
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#ifdef WINDOWS
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LeaveCriticalSection(&(PRIVATE->mutex));
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#else
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pthread_mutex_unlock(&(PRIVATE->mutex));
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#endif
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}
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bool PIMutex::tryLock() {
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bool ret =
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#ifdef WINDOWS
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(TryEnterCriticalSection(&(PRIVATE->mutex)) != 0);
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#else
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(pthread_mutex_trylock(&(PRIVATE->mutex)) == 0);
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#endif
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return ret;
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}
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void * PIMutex::handle() {
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return (void*)&(PRIVATE->mutex);
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}
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void PIMutex::init() {
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#ifdef WINDOWS
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InitializeCriticalSection(&(PRIVATE->mutex));
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#else
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pthread_mutexattr_t attr;
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memset(&attr, 0, sizeof(attr));
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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memset(&(PRIVATE->mutex), 0, sizeof(PRIVATE->mutex));
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pthread_mutex_init(&(PRIVATE->mutex), &attr);
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pthread_mutexattr_destroy(&attr);
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#endif
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}
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void PIMutex::destroy() {
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#ifdef WINDOWS
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DeleteCriticalSection(&(PRIVATE->mutex));
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#else
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pthread_mutex_destroy(&(PRIVATE->mutex));
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#endif
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}
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