thread.h

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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(THREAD_H)
#define THREAD_H

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#ifndef _WIN32
#include <pthread.h>
#include <sched.h>
#include <sys/resource.h>
#endif

#ifdef HAVE_ASM_ATOMIC_H
#include <asm/atomic.h>
#endif

#include "Exception.h"
STANDARD_EXCEPTION(ThreadException);

class Thread  
{
public:
#ifdef _WIN32
	enum Priority {
		IDLE = THREAD_PRIORITY_IDLE,
		LOW = THREAD_PRIORITY_BELOW_NORMAL,
		NORMAL = THREAD_PRIORITY_NORMAL,
		HIGH = THREAD_PRIORITY_ABOVE_NORMAL
	};

	Thread() throw() : threadHandle(NULL), threadId(0){ }
	virtual ~Thread() { 
		if(threadHandle)
			CloseHandle(threadHandle);
	}
	
	void start() throw(ThreadException);
	void join() throw(ThreadException) {
		if(threadHandle == NULL) {
			return;
		}

		WaitForSingleObject(threadHandle, INFINITE);
		CloseHandle(threadHandle);
		threadHandle = NULL;
	}

	void setThreadPriority(Priority p) throw() { ::SetThreadPriority(threadHandle, p); }
	
	static void sleep(u_int32_t millis) { ::Sleep(millis); }
	static void yield() { ::Sleep(1); }
	static long safeInc(volatile long& v) { return InterlockedIncrement(&v); }
	static long safeDec(volatile long& v) { return InterlockedDecrement(&v); }
	static long safeExchange(volatile long& target, long value) { return InterlockedExchange(&target, value); }

#else

	enum Priority {
		IDLE = 1,
		LOW = 1,
		NORMAL = 0,
		HIGH = -1
	};
	Thread() throw() : threadHandle(0) { }
	virtual ~Thread() { 
		if(threadHandle != 0) {
			pthread_detach(threadHandle);
		}
	}
	void start() throw(ThreadException);
	void join() throw() { 
		if (threadHandle) {
			pthread_join(threadHandle, 0);
			threadHandle = 0;
		}
	}

	void setThreadPriority(Priority p) { setpriority(PRIO_PROCESS, 0, p); }
	static void sleep(u_int32_t millis) { ::usleep(millis*1000); }
	static void yield() { ::sched_yield(); }
	static long safeInc(volatile long& v) { 
#ifdef HAVE_ASM_ATOMIC_H
		atomic_t t = ATOMIC_INIT(v);
		atomic_inc(&t);
		return (v=t.counter);
#else
#warning FIXME
		return ++v;
#endif
	}
	static long safeDec(volatile long& v) { 
#ifdef HAVE_ASM_ATOMIC_H
		atomic_t t = ATOMIC_INIT(v);
		atomic_dec(&t);
		return (v=t.counter);
#else
#warning FIXME
		return --v;
#endif
	}
#endif

protected:
	virtual int run() = 0;
	
private:
	Thread(const Thread&);
	Thread& operator=(const Thread&);

#ifdef _WIN32
	HANDLE threadHandle;
	DWORD threadId;
	static DWORD WINAPI starter(void* p) {
		Thread* t = (Thread*)p;
		t->run();
		return 0;
	}
#else
	pthread_t threadHandle;
	static void* starter(void* p) {
		Thread* t = (Thread*)p;
		t->run();
		return NULL;
	}
#endif
};

#endif // !defined(THREAD_H)