1 /* ***** BEGIN LICENSE BLOCK *****
2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 * The contents of this file are subject to the Mozilla Public License Version
5 * 1.1 (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 * http://www.mozilla.org/MPL/
9 * Software distributed under the License is distributed on an "AS IS" basis,
10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11 * for the specific language governing rights and limitations under the
14 * The Original Code is the Netscape security libraries.
16 * The Initial Developer of the Original Code is
17 * Netscape Communications Corporation.
18 * Portions created by the Initial Developer are Copyright (C) 1994-2000
19 * the Initial Developer. All Rights Reserved.
23 * Alternatively, the contents of this file may be used under the terms of
24 * either the GNU General Public License Version 2 or later (the "GPL"), or
25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26 * in which case the provisions of the GPL or the LGPL are applicable instead
27 * of those above. If you wish to allow use of your version of this file only
28 * under the terms of either the GPL or the LGPL, and not to allow others to
29 * use your version of this file under the terms of the MPL, indicate your
30 * decision by deleting the provisions above and replace them with the notice
31 * and other provisions required by the GPL or the LGPL. If you do not delete
32 * the provisions above, a recipient may use your version of this file under
33 * the terms of any one of the MPL, the GPL or the LGPL.
35 * ***** END LICENSE BLOCK ***** */
37 * Locking and queue management primatives
49 * create a new lock for a Module List
51 SECMODListLock *SECMOD_NewListLock()
53 return NSSRWLock_New( 10, "moduleListLock");
59 void SECMOD_DestroyListLock(SECMODListLock *lock)
61 NSSRWLock_Destroy(lock);
66 * Lock the List for Read: NOTE: this assumes the reading isn't so common
67 * the writing will be starved.
69 void SECMOD_GetReadLock(SECMODListLock *modLock)
71 NSSRWLock_LockRead(modLock);
75 * Release the Read lock
77 void SECMOD_ReleaseReadLock(SECMODListLock *modLock)
79 NSSRWLock_UnlockRead(modLock);
84 * lock the list for Write
86 void SECMOD_GetWriteLock(SECMODListLock *modLock)
88 NSSRWLock_LockWrite(modLock);
93 * Release the Write Lock: NOTE, this code is pretty inefficient if you have
94 * lots of write collisions.
96 void SECMOD_ReleaseWriteLock(SECMODListLock *modLock)
98 NSSRWLock_UnlockWrite(modLock);
103 * must Hold the Write lock
106 SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)
108 *parent = child->next;
113 * if lock is not specified, it must already be held
116 SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,
117 SECMODListLock *lock)
119 if (lock) { SECMOD_GetWriteLock(lock); }
121 child->next = parent->next;
122 parent->next = child;
124 if (lock) { SECMOD_ReleaseWriteLock(lock); }