jsemaphore.cpp
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "jsemaphore.h"
#include "jsemaphoreexception.h"
#include "jmutex.h"
#include <semaphore.h>
#include <errno.h>
namespace jthread {
bool is_wait_time_out = false;
Semaphore::Semaphore(uint16_t value_)
{
if (sem_init(&_semaphore, 0, value_)) {
if (errno == EINVAL) {
throw SemaphoreException("Operation would increase the semaphore count !");
} else {
throw SemaphoreException("Unknown semaphore error !");
}
}
_count = 0;
}
Semaphore::~Semaphore()
{
while (sem_destroy(&_semaphore) == EBUSY) {
Notify();
}
}
void Semaphore::Close()
{
sem_close(&_semaphore);
}
void Semaphore::Wait()
{
sem_wait(&_semaphore);
}
void Semaphore::Wait(struct timespec time_)
{
/*
struct timespec t;
t.tv_sec = time_.seconds;
t.tv_nsec = time_.nano_seconds;
*/
sem_timedwait(&_semaphore, &time_);
}
void Semaphore::Notify()
{
if (sem_post(&_semaphore)) {
if (errno == ERANGE) {
throw SemaphoreException("Operation would increase the semaphore count !");
} else {
throw SemaphoreException("Unknown semaphore error !");
}
}
}
bool Semaphore::TryWait()
{
if (sem_trywait(&_semaphore)) {
if (errno == EAGAIN) {
return false;
}
throw SemaphoreException("Unknown semaphore error !");
}
return true;
}
int Semaphore::GetValue()
{
int r;
sem_getvalue(&_semaphore, &r);
return r;
}
};