/*
    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"

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

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

#include "SDL_thread.h"
#include "../SDL_thread_c.h"
#include "../SDL_systhread.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, NULL);
}

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

/* vi: set ts=4 sw=4 expandtab: */