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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Locking and queue management primatives
*
*/
#include "seccomon.h"
#include "nssilock.h"
#include "secmod.h"
#include "secmodi.h"
#include "secmodti.h"
#include "nssrwlk.h"
/*
* create a new lock for a Module List
*/
SECMODListLock *SECMOD_NewListLock()
{
return NSSRWLock_New( 10, "moduleListLock");
}
/*
* destroy the lock
*/
void SECMOD_DestroyListLock(SECMODListLock *lock)
{
NSSRWLock_Destroy(lock);
}
/*
* Lock the List for Read: NOTE: this assumes the reading isn't so common
* the writing will be starved.
*/
void SECMOD_GetReadLock(SECMODListLock *modLock)
{
NSSRWLock_LockRead(modLock);
}
/*
* Release the Read lock
*/
void SECMOD_ReleaseReadLock(SECMODListLock *modLock)
{
NSSRWLock_UnlockRead(modLock);
}
/*
* lock the list for Write
*/
void SECMOD_GetWriteLock(SECMODListLock *modLock)
{
NSSRWLock_LockWrite(modLock);
}
/*
* Release the Write Lock: NOTE, this code is pretty inefficient if you have
* lots of write collisions.
*/
void SECMOD_ReleaseWriteLock(SECMODListLock *modLock)
{
NSSRWLock_UnlockWrite(modLock);
}
/*
* must Hold the Write lock
*/
void
SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)
{
*parent = child->next;
child->next = NULL;
}
/*
* if lock is not specified, it must already be held
*/
void
SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,
SECMODListLock *lock)
{
if (lock) { SECMOD_GetWriteLock(lock); }
child->next = parent->next;
parent->next = child;
if (lock) { SECMOD_ReleaseWriteLock(lock); }
}
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