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/*
* Copyright (C) 2001-2006 Jacek Sieka, arnetheduck on gmail point com
*
* 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.
*/
#if !defined(SEMAPHORE_H)
#define SEMAPHORE_H
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#ifndef _WIN32
#include "CriticalSection.h"
#include <sys/time.h>
#endif
class Semaphore
{
#ifdef _WIN32
public:
Semaphore() throw() {
h = CreateSemaphore(NULL, 0, MAXLONG, NULL);
}
void signal() throw() {
ReleaseSemaphore(h, 1, NULL);
}
bool wait() throw() { return WaitForSingleObject(h, INFINITE) == WAIT_OBJECT_0; }
bool wait(u_int32_t millis) throw() { return WaitForSingleObject(h, millis) == WAIT_OBJECT_0; }
~Semaphore() throw() {
CloseHandle(h);
}
private:
HANDLE h;
#else
public:
Semaphore() throw() : count(0) { pthread_cond_init(&cond, NULL); }
~Semaphore() throw() { pthread_cond_destroy(&cond); }
void signal() throw() {
Lock l(cs);
count++;
pthread_cond_signal(&cond);
}
bool wait() throw() {
Lock l(cs);
if(count == 0) {
pthread_cond_wait(&cond, &cs.getMutex());
}
count--;
return true;
}
bool wait(u_int32_t millis) throw() {
Lock l(cs);
if(count == 0) {
timeval timev;
timespec t;
gettimeofday(&timev, NULL);
millis+=timev.tv_usec/1000;
t.tv_sec = timev.tv_sec + (millis/1000);
t.tv_nsec = (millis%1000)*1000*1000;
int ret = pthread_cond_timedwait(&cond, &cs.getMutex(), &t);
if(ret != 0) {
return false;
}
}
count--;
return true;
}
private:
pthread_cond_t cond;
CriticalSection cs;
int count;
#endif
Semaphore(const Semaphore&);
Semaphore& operator=(const Semaphore&);
};
#endif // !defined(SEMAPHORE_H)
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