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128 lines
3.2 KiB
C
128 lines
3.2 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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* Locking and queue management primatives
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*
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*/
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#include "seccomon.h"
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#include "nssilock.h"
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#include "secmod.h"
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#include "secmodi.h"
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#include "secmodti.h"
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#include "nssrwlk.h"
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/*
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* create a new lock for a Module List
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*/
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SECMODListLock *SECMOD_NewListLock()
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{
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return NSSRWLock_New( 10, "moduleListLock");
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}
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/*
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* destroy the lock
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*/
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void SECMOD_DestroyListLock(SECMODListLock *lock)
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{
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NSSRWLock_Destroy(lock);
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}
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/*
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* Lock the List for Read: NOTE: this assumes the reading isn't so common
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* the writing will be starved.
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*/
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void SECMOD_GetReadLock(SECMODListLock *modLock)
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{
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NSSRWLock_LockRead(modLock);
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}
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/*
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* Release the Read lock
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*/
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void SECMOD_ReleaseReadLock(SECMODListLock *modLock)
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{
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NSSRWLock_UnlockRead(modLock);
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}
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/*
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* lock the list for Write
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*/
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void SECMOD_GetWriteLock(SECMODListLock *modLock)
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{
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NSSRWLock_LockWrite(modLock);
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}
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/*
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* Release the Write Lock: NOTE, this code is pretty inefficient if you have
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* lots of write collisions.
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*/
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void SECMOD_ReleaseWriteLock(SECMODListLock *modLock)
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{
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NSSRWLock_UnlockWrite(modLock);
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}
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/*
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* must Hold the Write lock
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*/
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void
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SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)
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{
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*parent = child->next;
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child->next = NULL;
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}
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/*
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* if lock is not specified, it must already be held
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*/
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void
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SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,
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SECMODListLock *lock)
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{
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if (lock) { SECMOD_GetWriteLock(lock); }
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child->next = parent->next;
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parent->next = child;
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if (lock) { SECMOD_ReleaseWriteLock(lock); }
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}
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