prenv.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) 1998-2000 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.
 */

#include <string.h>
#include "primpl.h"

/* Lock used to lock the environment */
#if defined(_PR_NO_PREEMPT)
#define _PR_NEW_LOCK_ENV()
#define _PR_DELETE_LOCK_ENV()
#define _PR_LOCK_ENV()
#define _PR_UNLOCK_ENV()
#elif defined(_PR_LOCAL_THREADS_ONLY)
extern _PRCPU * _pr_primordialCPU;
static PRIntn _is;
#define _PR_NEW_LOCK_ENV()
#define _PR_DELETE_LOCK_ENV()
#define _PR_LOCK_ENV() if (_pr_primordialCPU) _PR_INTSOFF(_is);
#define _PR_UNLOCK_ENV() if (_pr_primordialCPU) _PR_INTSON(_is);
#else
static PRLock *_pr_envLock = NULL;
#define _PR_NEW_LOCK_ENV() {_pr_envLock = PR_NewLock();}
#define _PR_DELETE_LOCK_ENV() \
    { if (_pr_envLock) { PR_DestroyLock(_pr_envLock); _pr_envLock = NULL; } }
#define _PR_LOCK_ENV() { if (_pr_envLock) PR_Lock(_pr_envLock); }
#define _PR_UNLOCK_ENV() { if (_pr_envLock) PR_Unlock(_pr_envLock); }
#endif

/************************************************************************/

void _PR_InitEnv(void)
{
	_PR_NEW_LOCK_ENV();
}

void _PR_CleanupEnv(void)
{
    _PR_DELETE_LOCK_ENV();
}

PR_IMPLEMENT(char*) PR_GetEnv(const char *var)
{
    char *ev;

    if (!_pr_initialized) _PR_ImplicitInitialization();

    _PR_LOCK_ENV();
    ev = _PR_MD_GET_ENV(var);
    _PR_UNLOCK_ENV();
    return ev;
}

PR_IMPLEMENT(PRStatus) PR_SetEnv(const char *string)
{
    PRIntn result;

    if (!_pr_initialized) _PR_ImplicitInitialization();

    if ( !strchr(string, '=')) return(PR_FAILURE);

    _PR_LOCK_ENV();
    result = _PR_MD_PUT_ENV(string);
    _PR_UNLOCK_ENV();
    return (result)? PR_FAILURE : PR_SUCCESS;
}

/*
** DEPRECATED.  Use PR_SetEnv() instead.
*/
#ifdef XP_MAC
PR_IMPLEMENT(PRIntn) PR_PutEnv(const char *string)
{
    return (PR_SetEnv(string) == PR_SUCCESS) ? PR_TRUE : PR_FALSE;
}
#endif