| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| /* |
| * 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); } |
| } |
| |
| |