зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
3.7 KiB
C
113 строки
3.7 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* nsslocks.h - threadsafe functions to initialize lock pointers.
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*
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* NOTE - These are not public interfaces
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*
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* $Id: nsslocks.c,v 1.5 2004/04/25 15:03:17 gerv%gerv.net Exp $
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*/
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#include "seccomon.h"
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#include "nsslocks.h"
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#include "pratom.h"
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#include "prthread.h"
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/* Given the address of a (global) pointer to a PZLock,
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* atomicly create the lock and initialize the (global) pointer,
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* if it is not already created/initialized.
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*/
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SECStatus
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__nss_InitLock( PZLock **ppLock, nssILockType ltype )
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{
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static PRInt32 initializers;
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PORT_Assert( ppLock != NULL);
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/* atomically initialize the lock */
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while (!*ppLock) {
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PRInt32 myAttempt = PR_AtomicIncrement(&initializers);
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if (myAttempt == 1) {
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if (!*ppLock) {
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*ppLock = PZ_NewLock(ltype);
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}
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(void) PR_AtomicDecrement(&initializers);
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break;
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}
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PR_Sleep(PR_INTERVAL_NO_WAIT); /* PR_Yield() */
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(void) PR_AtomicDecrement(&initializers);
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}
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return (*ppLock != NULL) ? SECSuccess : SECFailure;
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}
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SECStatus
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nss_InitLock( PZLock **ppLock, nssILockType ltype )
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{
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return __nss_InitLock(ppLock, ltype);
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}
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/* Given the address of a (global) pointer to a PZMonitor,
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* atomicly create the monitor and initialize the (global) pointer,
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* if it is not already created/initialized.
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*/
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SECStatus
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nss_InitMonitor(PZMonitor **ppMonitor, nssILockType ltype )
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{
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static PRInt32 initializers;
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PORT_Assert( ppMonitor != NULL);
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/* atomically initialize the lock */
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while (!*ppMonitor) {
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PRInt32 myAttempt = PR_AtomicIncrement(&initializers);
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if (myAttempt == 1) {
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if (!*ppMonitor) {
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*ppMonitor = PZ_NewMonitor(ltype);
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}
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(void) PR_AtomicDecrement(&initializers);
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break;
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}
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PR_Sleep(PR_INTERVAL_NO_WAIT); /* PR_Yield() */
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(void) PR_AtomicDecrement(&initializers);
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}
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return (*ppMonitor != NULL) ? SECSuccess : SECFailure;
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}
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