diff options
Diffstat (limited to 'security/nss/lib/pk11wrap/pk11list.c')
-rw-r--r-- | security/nss/lib/pk11wrap/pk11list.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/security/nss/lib/pk11wrap/pk11list.c b/security/nss/lib/pk11wrap/pk11list.c new file mode 100644 index 000000000..aaf29f69d --- /dev/null +++ b/security/nss/lib/pk11wrap/pk11list.c @@ -0,0 +1,99 @@ +/* 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); + } +} |