/*
    PIP - Platform Independent Primitives
    Thread
    Copyright (C) 2011  Ivan Pelipenko peri4ko@gmail.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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "pithread.h"


PIThread::PIThread(bool startNow, int timer_delay): PIObject() {
	piMonitor.threads++;
	running = lockRun = false;
	priority_ = piNormal;
	timer = timer_delay;
	/*addEvent("started");
	addEvent("stopped");
	addEventHandler<int>(HANDLER(PIThread, start));
	addEventHandler(HANDLER(PIThread, startOnce));
	addEventHandler(HANDLER(PIThread, stop));
	addEventHandler<bool>(HANDLER(PIThread, terminate));*/
	if (startNow) start(timer_delay);
}

#ifndef WINDOWS
#else
#endif

PIThread::~PIThread() {
	piMonitor.threads--;
	if (!running) return;
#ifndef WINDOWS
	pthread_cancel(thread);
#else
	CloseHandle(thread);
#endif
}


bool PIThread::start(int timer_delay) {
	terminating = running = false;
	timer = timer_delay;
#ifndef WINDOWS
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setschedparam(&attr, &sparam);
	if (pthread_create(&thread, &attr, thread_function, this) == 0) {
		running = true;
		return true;
	}
#else
	thread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)thread_function, this, 0, 0);
	if (thread == 0)
		return false;
	setPriority(priority_);
#endif
	return false;
}


bool PIThread::startOnce() {
	terminating = running = false;
#ifndef WINDOWS
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	pthread_attr_setschedparam(&attr, &sparam);
	if (pthread_create(&thread, &attr, thread_function_once, this) == 0)
		return true;
#else
	thread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)thread_function_once, this, 0, 0);
	if (thread == 0)
		return false;
	setPriority(priority_);
#endif
	return false;
}


void PIThread::terminate(bool hard) {
	if (thread == 0) return;
	running = false;
#ifndef WINDOWS
	if (hard) kill(thread, SIGKILL);
	else pthread_cancel(thread);
#else
	CloseHandle(thread);
#endif
	thread = 0;
	end();
}


void * PIThread::thread_function(void * t) {
	PIThread * ct = (PIThread * )t;
	ct->running = true;
	ct->begin();
	raiseEvent(ct, "started");
	while (!ct->terminating) {
		if (ct->lockRun) ct->mutex_.lock();
		ct->run();
		if (ct->lockRun) ct->mutex_.unlock();
		if (ct->timer > 0) msleep(ct->timer);
	}
	raiseEvent(ct, "stopped");
	ct->end();
	ct->running = false;
	//cout << "thread " << t << " exiting ... " << endl;
#ifndef WINDOWS
	pthread_exit(0);
#else
	ExitThread(0);
#endif
	return 0;
}


void * PIThread::thread_function_once(void * t) {
	PIThread * ct = (PIThread * )t;
	ct->running = true;
	ct->begin();
	raiseEvent(ct, "started");
	if (ct->lockRun) ct->mutex_.lock();
	ct->run();
	if (ct->lockRun) ct->mutex_.unlock();
	raiseEvent(ct, "stopped");
	ct->end();
	ct->running = false;
	//cout << "thread " << t << " exiting ... " << endl;
#ifndef WINDOWS
	pthread_exit(0);
#else
	ExitThread(0);
#endif
	return 0;
}


void PIThread::setPriority(PIThread::Priority prior) {
	priority_ = prior;
#ifndef WINDOWS
#  ifndef LINUX
	sparam.sched_priority = (int)priority_;
#  else
	sparam.__sched_priority = (int)priority_;
#  endif
	if (!running) return;
	pthread_getschedparam(thread, &policy, &sparam);
	pthread_setschedparam(thread, policy, &sparam);
#else
	if (!running) return;
	SetThreadPriority(thread, -(int)priority_);
#endif
}


bool PIThread::waitForFinish(int timeout_msecs) {
	if (timeout_msecs < 0) {
		while (running)
			msleep(1);
		return true;
	}
	int cnt = 0;
	while (running && cnt < timeout_msecs) {
		msleep(1);
		++cnt;
	}
	return cnt < timeout_msecs;
}


bool PIThread::waitForStart(int timeout_msecs) {
	if (timeout_msecs < 0) {
		while (!running)
			msleep(1);
		return true;
	}
	int cnt = 0;
	while (!running && cnt < timeout_msecs) {
		msleep(1);
		++cnt;
	}
	return cnt < timeout_msecs;
}