www.pudn.com > DCPlusPlus-src.zip > Semaphore.h

/*  
 * Copyright (C) 2001-2004 Jacek Sieka, j_s at telia 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(AFX_SEMAPHORE_H__99141DD0_FECE_4131_BC9B_7BE4CF216874__INCLUDED_) 
#define AFX_SEMAPHORE_H__99141DD0_FECE_4131_BC9B_7BE4CF216874__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
 
#ifndef _WIN32 
#include "CriticalSection.h" 
#include  
#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(AFX_SEMAPHORE_H__99141DD0_FECE_4131_BC9B_7BE4CF216874__INCLUDED_) 
 
/** 
 * @file 
 * $Id: Semaphore.h,v 1.12 2004/09/06 12:32:42 arnetheduck Exp $ 
 */