Ivan Pelipenko
42925122cb
source tree changed detached PIConsole and PIScreen* in "pip_console" library
144 lines
3.4 KiB
C++
144 lines
3.4 KiB
C++
/*
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PIP - Platform Independent Primitives
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Mutex
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Ivan Pelipenko peri4ko@yandex.ru, 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 BLACKBERRY
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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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HANDLE
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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(): inited_(false) {
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//printf("new Mutex %p\n", this);
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#ifdef WINDOWS
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PRIVATE->mutex = 0;
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#endif
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init();
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}
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PIMutex::~PIMutex() {
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//printf("del Mutex %p\n", this);
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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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// std::cout << (ullong)PRIVATE->mutex << "locking..." << std::endl;
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// DWORD wr =
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WaitForSingleObject(PRIVATE->mutex, INFINITE);
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// std::cout << (ullong)PRIVATE->mutex << " lock wr=" << wr << std::endl;
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#else
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pthread_mutex_lock(&(PRIVATE->mutex));
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#endif
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locked = true;
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}
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void PIMutex::unlock() {
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#ifdef WINDOWS
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// BOOL wr =
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// ReleaseMutex(PRIVATE->mutex);
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SetEvent(PRIVATE->mutex);
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// std::cout << (ullong)PRIVATE->mutex << " unlock wr=" << wr << std::endl;
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#else
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pthread_mutex_unlock(&(PRIVATE->mutex));
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#endif
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locked = false;
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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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(WaitForSingleObject(PRIVATE->mutex, 0) == WAIT_OBJECT_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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locked = true;
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return ret;
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}
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bool PIMutex::isLocked() const {
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// std::cout << "test " << (ullong)PRIVATE->mutex << std::endl;
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return locked;
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}
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void PIMutex::init() {
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if (inited_) destroy();
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#ifdef WINDOWS
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PRIVATE->mutex = CreateEvent(NULL, FALSE, TRUE, NULL);
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// std::cout << "create " << (ullong)PRIVATE->mutex << std::endl;
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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_NORMAL);
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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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locked = false;
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inited_ = true;
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}
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void PIMutex::destroy() {
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if (inited_) {
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#ifdef WINDOWS
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// std::cout << "destroy " << (ullong)PRIVATE->mutex << std::endl;
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if (PRIVATE->mutex) CloseHandle(PRIVATE->mutex);
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PRIVATE->mutex = 0;
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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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locked = inited_ = false;
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}
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