зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
3.3 KiB
C
106 строки
3.3 KiB
C
/*
|
|
* 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 security libraries.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1994-2000 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.
|
|
*/
|
|
|
|
/*
|
|
* nsslocks.h - threadsafe functions to initialize lock pointers.
|
|
*
|
|
* NOTE - These are not public interfaces
|
|
*
|
|
* $Id: nsslocks.c,v 1.3 2001/01/30 21:02:28 wtc%netscape.com Exp $
|
|
*/
|
|
|
|
#include "seccomon.h"
|
|
#include "nsslocks.h"
|
|
#include "pratom.h"
|
|
#include "prthread.h"
|
|
|
|
/* Given the address of a (global) pointer to a PZLock,
|
|
* atomicly create the lock and initialize the (global) pointer,
|
|
* if it is not already created/initialized.
|
|
*/
|
|
|
|
SECStatus
|
|
__nss_InitLock( PZLock **ppLock, nssILockType ltype )
|
|
{
|
|
static PRInt32 initializers;
|
|
|
|
PORT_Assert( ppLock != NULL);
|
|
|
|
/* atomically initialize the lock */
|
|
while (!*ppLock) {
|
|
PRInt32 myAttempt = PR_AtomicIncrement(&initializers);
|
|
if (myAttempt == 1) {
|
|
*ppLock = PZ_NewLock(ltype);
|
|
(void) PR_AtomicDecrement(&initializers);
|
|
break;
|
|
}
|
|
PR_Sleep(PR_INTERVAL_NO_WAIT); /* PR_Yield() */
|
|
(void) PR_AtomicDecrement(&initializers);
|
|
}
|
|
|
|
return (*ppLock != NULL) ? SECSuccess : SECFailure;
|
|
}
|
|
|
|
SECStatus
|
|
nss_InitLock( PZLock **ppLock, nssILockType ltype )
|
|
{
|
|
return __nss_InitLock(ppLock, ltype);
|
|
}
|
|
|
|
/* Given the address of a (global) pointer to a PZMonitor,
|
|
* atomicly create the monitor and initialize the (global) pointer,
|
|
* if it is not already created/initialized.
|
|
*/
|
|
|
|
SECStatus
|
|
nss_InitMonitor(PZMonitor **ppMonitor, nssILockType ltype )
|
|
{
|
|
static PRInt32 initializers;
|
|
|
|
PORT_Assert( ppMonitor != NULL);
|
|
|
|
/* atomically initialize the lock */
|
|
while (!*ppMonitor) {
|
|
PRInt32 myAttempt = PR_AtomicIncrement(&initializers);
|
|
if (myAttempt == 1) {
|
|
*ppMonitor = PZ_NewMonitor(ltype);
|
|
(void) PR_AtomicDecrement(&initializers);
|
|
break;
|
|
}
|
|
PR_Sleep(PR_INTERVAL_NO_WAIT); /* PR_Yield() */
|
|
(void) PR_AtomicDecrement(&initializers);
|
|
}
|
|
|
|
return (*ppMonitor != NULL) ? SECSuccess : SECFailure;
|
|
}
|