/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* RISC OS version based on pthreads linux source */

#include "SDL_thread.h"

#include "../SDL_systhread.h"

#if SDL_THREADS_DISABLED

int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)

{

	SDL_SetError("Threads have not been compiled into this version of the library");

	return(-1);

}

void SDL_SYS_SetupThread(void)

{

	return;

}

Uint32 SDL_ThreadID(void)

{

	return(0);

}

void SDL_SYS_WaitThread(SDL_Thread *thread)

{

	return;

}

void SDL_SYS_KillThread(SDL_Thread *thread)

{

	return;

}

#else

#include <signal.h>

/* List of signals to mask in the subthreads */

static int sig_list[] = {

	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,

	SIGVTALRM, SIGPROF, 0

};

#include <pthread.h>

int riscos_using_threads = 0;

Uint32 riscos_main_thread = 0; /* Thread running events */

static void *RunThread(void *data)

{

	SDL_RunThread(data);

	pthread_exit((void*)0);

	return((void *)0);		/* Prevent compiler warning */

}

int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)

{

	pthread_attr_t type;

	/* Set the thread attributes */

	if ( pthread_attr_init(&type) != 0 ) {

		SDL_SetError("Couldn't initialize pthread attributes");

		return(-1);

	}

	pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);

	/* Create the thread and go! */

	if ( pthread_create(&thread->handle, &type, RunThread, args) != 0 ) {

		SDL_SetError("Not enough resources to create thread");

		return(-1);

	}

        if (riscos_using_threads == 0)

        {

           riscos_using_threads = 1;

           riscos_main_thread = SDL_ThreadID();

        }

	return(0);

}

void SDL_SYS_SetupThread(void)

{

	int i;

	sigset_t mask;

	/* Mask asynchronous signals for this thread */

	sigemptyset(&mask);

	for ( i=0; sig_list[i]; ++i ) {

		sigaddset(&mask, sig_list[i]);

	}

	pthread_sigmask(SIG_BLOCK, &mask, 0);

#ifdef PTHREAD_CANCEL_ASYNCHRONOUS

	/* Allow ourselves to be asynchronously cancelled */

	{ int oldstate;

		pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);

	}

#endif

}

Uint32 SDL_ThreadID(void)

{

	return((Uint32)pthread_self());

}

void SDL_SYS_WaitThread(SDL_Thread *thread)

{

	pthread_join(thread->handle, 0);

}

void SDL_SYS_KillThread(SDL_Thread *thread)

{

#ifdef PTHREAD_CANCEL_ASYNCHRONOUS

	pthread_cancel(thread->handle);

#else

	pthread_kill(thread->handle, SIGKILL);

#endif

}

#endif