scummvm/backends/platform/psp/thread.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/backends/platform/psp/portdefs.h $
 * $Id: portdefs.h 38687 2009-02-21 12:08:52Z joostp $
 *
 */

#ifndef PSP_THREAD_H
#define PSP_THREAD_H

#include "common/scummsys.h"

class PspThread {
public:
	static void delayMillis(uint32 ms);
	static void delayMicros(uint32 us);
};

class PspSemaphore {
private:
	SceUID _handle;
public:
	PspSemaphore(int initialValue, int maxValue);
	~PspSemaphore();
	bool take(int num) { return takeWithTimeOut(num, 0); }
	bool takeWithTimeOut(int num, uint32 timeOut);
	bool give(int num);
	bool pollForValue(int value);	// check for a certain value
	int numOfWaitingThreads();
	int getValue();
};

class PspMutex {
private:
	PspSemaphore _semaphore;
public:
	PspMutex(bool initialValue) : _semaphore(initialValue ? 1 : 0, 255) {}	// initial, max value
	bool lock() { return _semaphore.take(1); }
	bool unlock() { return _semaphore.give(1); }
	bool poll() { return _semaphore.pollForValue(1); }
	int getNumWaitingThreads() { return _semaphore.numOfWaitingThreads(); }
	bool getValue() { return (bool)_semaphore.getValue(); }
};


class PspRtc {
private:
	uint32 _startMillis;
	uint32 _startMicros;
	uint32 _lastMillis;
	uint32 _milliOffset;		// to prevent looping around of millis
	bool _looped;				// make sure we only loop once
public:
	PspRtc() : _startMillis(0), _startMicros(0), _lastMillis(0), _milliOffset(0), _looped(false) { init(); }
	void init();
	uint32 getMillis();
	uint32 getMicros();
};

enum ThreadPriority {
	PRIORITY_MAIN_THREAD = 36,
	PRIORITY_TIMER_THREAD = 30,
	PRIORITY_AUDIO_THREAD = 25,		// must be higher than timer or we get stuttering
	PRIORITY_POWER_THREAD = 20,		// quite a light thread
	PRIORITY_DISPLAY_THREAD = 17	// very light thread for callbacks only
};

enum StackSizes {
	STACK_AUDIO_THREAD = 16 * 1024,
	STACK_TIMER_THREAD = 32 * 1024,
	STACK_DISPLAY_THREAD = 2 * 1024,
	STACK_POWER_THREAD = 4 * 1024
};
	
#endif /* PSP_THREADS_H */