sdl_systhread.c

网络MPEG4IP流媒体开发源代码

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/*
 *	GNU pth threads
 *
 *	Patrice Mandin
 */

#include "SDL_error.h"
#include "SDL_thread.h"
#include "SDL_systhread.h"

#include <signal.h>
#include <pth.h>

/* List of signals to mask in the subthreads */
static int sig_list[] = {
	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
	SIGVTALRM, SIGPROF, 0
};

static void *RunThread(void *data)
{
	SDL_RunThread(data);
	pth_exit((void*)0);
	return((void *)0);		/* Prevent compiler warning */
}

int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
	pth_attr_t type;

	/* Create a new attribute */
	type = pth_attr_new();
	if ( type == NULL ) {
		SDL_SetError("Couldn't initialize pth attributes");
		return(-1);
	}
	pth_attr_set(type, PTH_ATTR_JOINABLE, TRUE);

	/* Create the thread and go! */
	thread->handle = pth_spawn(type, RunThread, args);
	if ( thread->handle == NULL ) {
		SDL_SetError("Not enough resources to create thread");
		return(-1);
	}
	return(0);
}

void SDL_SYS_SetupThread(void)
{
	int i;
	sigset_t mask;
	int oldstate;

	/* Mask asynchronous signals for this thread */
	sigemptyset(&mask);
	for ( i=0; sig_list[i]; ++i ) {
		sigaddset(&mask, sig_list[i]);
	}
	pth_sigmask(SIG_BLOCK, &mask, 0);

	/* Allow ourselves to be asynchronously cancelled */
	pth_cancel_state(PTH_CANCEL_ASYNCHRONOUS, &oldstate);
}

/* WARNING:  This may not work for systems with 64-bit pid_t */
Uint32 SDL_ThreadID(void)
{
	return((Uint32)pth_self());
}

void SDL_SYS_WaitThread(SDL_Thread *thread)
{
	pth_join(thread->handle, 0);
}

void SDL_SYS_KillThread(SDL_Thread *thread)
{
	pth_cancel(thread->handle);
	pth_join(thread->handle, NULL);
}