#include "thread.h"

#define THREAD_STACKSIZE 65536

#define THREAD_READY	0x01
#define THREAD_RUNNING	0x02
#define THREAD_ENDED	0x03


Thread::Thread()
: arg(0), tid(0), state(THREAD_READY)
{}

Thread::~Thread()
{
	switch (state) {
	case THREAD_RUNNING:
		cancel();
	
	case THREAD_ENDED:
		join();
	
	case THREAD_READY:
		break;
	}
}

int Thread::start(void* arg_)
{
	pthread_attr_t attr;

	if (state != THREAD_READY)
		return -1;
	
	arg = arg_;
	state = THREAD_RUNNING;

	pthread_attr_init(&attr);
	pthread_attr_setstacksize(&attr, THREAD_STACKSIZE);

	if (pthread_create(&tid, &attr, (Thread::entry), this) != 0) {
		state = THREAD_READY;
		return -1;
	}

	return 0;
}

void Thread::cancel()
{
	pthread_cancel(tid);
	state = THREAD_ENDED;
}

bool Thread::isRunning() const
{
	return (state == THREAD_RUNNING);
}

int Thread::join()
{
	void* retval;
	pthread_join(tid, &retval);
	state = THREAD_READY;

	return (int)retval;
}

void* Thread::entry(void* myself)
{
	Thread* thread = (Thread*)myself;

	int retval = thread->execute(thread->arg);
	thread->state = THREAD_ENDED;

	return (void*)retval;
}