src/thread/riscos/SDL_systhread.c

/*
    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
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