src/thread/beos/SDL_syssem.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 10 Jan 2010 05:06:03 +0000
changeset 3623 9a73fecd9181
parent 2859 99210400e8b9
child 3697 f7b03b6838cb
permissions -rw-r--r--
Reverted r5460 ... this was merged from 1.2, but was later reverted there.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Semaphores in the BeOS environment */
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#include <be/kernel/OS.h>
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#include "SDL_thread.h"
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struct SDL_semaphore
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{
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    sem_id id;
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};
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/* Create a counting semaphore */
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SDL_sem *
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SDL_CreateSemaphore(Uint32 initial_value)
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{
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    SDL_sem *sem;
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    sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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    if (sem) {
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        sem->id = create_sem(initial_value, "SDL semaphore");
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        if (sem->id < B_NO_ERROR) {
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            SDL_SetError("create_sem() failed");
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            SDL_free(sem);
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            sem = NULL;
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        }
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    } else {
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        SDL_OutOfMemory();
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    }
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    return (sem);
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}
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/* Free the semaphore */
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void
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SDL_DestroySemaphore(SDL_sem * sem)
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{
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    if (sem) {
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        if (sem->id >= B_NO_ERROR) {
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            delete_sem(sem->id);
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        }
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        SDL_free(sem);
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    }
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}
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int
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SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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{
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    int32 val;
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    int retval;
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    if (!sem) {
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        SDL_SetError("Passed a NULL semaphore");
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        return -1;
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    }
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  tryagain:
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    if (timeout == SDL_MUTEX_MAXWAIT) {
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        val = acquire_sem(sem->id);
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    } else {
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        timeout *= 1000;        /* BeOS uses a timeout in microseconds */
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        val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout);
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    }
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    switch (val) {
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    case B_INTERRUPTED:
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        goto tryagain;
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    case B_NO_ERROR:
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        retval = 0;
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        break;
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    case B_TIMED_OUT:
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        retval = SDL_MUTEX_TIMEDOUT;
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        break;
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    case B_WOULD_BLOCK:
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        retval = SDL_MUTEX_TIMEDOUT;
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        break;
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    default:
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        SDL_SetError("acquire_sem() failed");
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        retval = -1;
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        break;
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    }
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    return retval;
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}
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int
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SDL_SemTryWait(SDL_sem * sem)
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{
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    return SDL_SemWaitTimeout(sem, 0);
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}
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int
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SDL_SemWait(SDL_sem * sem)
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{
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    return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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}
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/* Returns the current count of the semaphore */
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Uint32
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SDL_SemValue(SDL_sem * sem)
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{
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    int32 count;
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    Uint32 value;
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    value = 0;
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    if (sem) {
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        get_sem_count(sem->id, &count);
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        if (count > 0) {
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            value = (Uint32) count;
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        }
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    }
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    return value;
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}
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/* Atomically increases the semaphore's count (not blocking) */
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int
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SDL_SemPost(SDL_sem * sem)
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{
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    if (!sem) {
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        SDL_SetError("Passed a NULL semaphore");
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        return -1;
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    }
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    if (release_sem(sem->id) != B_NO_ERROR) {
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        SDL_SetError("release_sem() failed");
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        return -1;
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    }
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    return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */