pripcsem.c

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1999-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

/*
 * File: pripcsem.c
 *
 * Description: implements the named semaphores API in prsemipc.h
 * for classic NSPR.  If _PR_HAVE_NAMED_SEMAPHORES is not defined,
 * the named semaphore functions all fail with the error code
 * PR_NOT_IMPLEMENTED_ERROR.
 */

#include "primpl.h"

#ifdef _PR_PTHREADS

#error "This file should not be compiled for the pthreads version"

#else

#ifndef _PR_HAVE_NAMED_SEMAPHORES

PRSem * _PR_MD_OPEN_SEMAPHORE(
    const char *osname, PRIntn flags, PRIntn mode, PRUintn value)
{
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return NULL;
}

PRStatus _PR_MD_WAIT_SEMAPHORE(PRSem *sem)
{
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return PR_FAILURE;
}

PRStatus _PR_MD_POST_SEMAPHORE(PRSem *sem)
{
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return PR_FAILURE;
}

PRStatus _PR_MD_CLOSE_SEMAPHORE(PRSem *sem)
{
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return PR_FAILURE;
}

PRStatus _PR_MD_DELETE_SEMAPHORE(const char *osname)
{
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    return PR_FAILURE;
}

#endif /* !_PR_HAVE_NAMED_SEMAPHORES */

PR_IMPLEMENT(PRSem *) PR_OpenSemaphore(
    const char *name, PRIntn flags, PRIntn mode, PRUintn value)
{
    char osname[PR_IPC_NAME_SIZE];

    if (!_pr_initialized) _PR_ImplicitInitialization();
    if (_PR_MakeNativeIPCName(name, osname, sizeof(osname), _PRIPCSem)
            == PR_FAILURE) {
        return NULL;
    }
    return _PR_MD_OPEN_SEMAPHORE(osname, flags, mode, value);
}

PR_IMPLEMENT(PRStatus) PR_WaitSemaphore(PRSem *sem)
{
    return _PR_MD_WAIT_SEMAPHORE(sem);
}

PR_IMPLEMENT(PRStatus) PR_PostSemaphore(PRSem *sem)
{
    return _PR_MD_POST_SEMAPHORE(sem);
}

PR_IMPLEMENT(PRStatus) PR_CloseSemaphore(PRSem *sem)
{
    return _PR_MD_CLOSE_SEMAPHORE(sem);
}

PR_IMPLEMENT(PRStatus) PR_DeleteSemaphore(const char *name)
{
    char osname[PR_IPC_NAME_SIZE];

    if (!_pr_initialized) _PR_ImplicitInitialization();
    if (_PR_MakeNativeIPCName(name, osname, sizeof(osname), _PRIPCSem)
            == PR_FAILURE) {
        return PR_FAILURE;
    }
    return _PR_MD_DELETE_SEMAPHORE(osname);
}

#endif /* _PR_PTHREADS */