1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/nss/lib/pk11wrap/pk11list.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,95 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +/*
1.8 + * Locking and queue management primatives
1.9 + *
1.10 + */
1.11 +
1.12 +#include "seccomon.h"
1.13 +#include "nssilock.h"
1.14 +#include "secmod.h"
1.15 +#include "secmodi.h"
1.16 +#include "secmodti.h"
1.17 +#include "nssrwlk.h"
1.18 +
1.19 +/*
1.20 + * create a new lock for a Module List
1.21 + */
1.22 +SECMODListLock *SECMOD_NewListLock()
1.23 +{
1.24 + return NSSRWLock_New( 10, "moduleListLock");
1.25 +}
1.26 +
1.27 +/*
1.28 + * destroy the lock
1.29 + */
1.30 +void SECMOD_DestroyListLock(SECMODListLock *lock)
1.31 +{
1.32 + NSSRWLock_Destroy(lock);
1.33 +}
1.34 +
1.35 +
1.36 +/*
1.37 + * Lock the List for Read: NOTE: this assumes the reading isn't so common
1.38 + * the writing will be starved.
1.39 + */
1.40 +void SECMOD_GetReadLock(SECMODListLock *modLock)
1.41 +{
1.42 + NSSRWLock_LockRead(modLock);
1.43 +}
1.44 +
1.45 +/*
1.46 + * Release the Read lock
1.47 + */
1.48 +void SECMOD_ReleaseReadLock(SECMODListLock *modLock)
1.49 +{
1.50 + NSSRWLock_UnlockRead(modLock);
1.51 +}
1.52 +
1.53 +
1.54 +/*
1.55 + * lock the list for Write
1.56 + */
1.57 +void SECMOD_GetWriteLock(SECMODListLock *modLock)
1.58 +{
1.59 + NSSRWLock_LockWrite(modLock);
1.60 +}
1.61 +
1.62 +
1.63 +/*
1.64 + * Release the Write Lock: NOTE, this code is pretty inefficient if you have
1.65 + * lots of write collisions.
1.66 + */
1.67 +void SECMOD_ReleaseWriteLock(SECMODListLock *modLock)
1.68 +{
1.69 + NSSRWLock_UnlockWrite(modLock);
1.70 +}
1.71 +
1.72 +
1.73 +/*
1.74 + * must Hold the Write lock
1.75 + */
1.76 +void
1.77 +SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)
1.78 +{
1.79 + *parent = child->next;
1.80 + child->next = NULL;
1.81 +}
1.82 +
1.83 +/*
1.84 + * if lock is not specified, it must already be held
1.85 + */
1.86 +void
1.87 +SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,
1.88 + SECMODListLock *lock)
1.89 +{
1.90 + if (lock) { SECMOD_GetWriteLock(lock); }
1.91 +
1.92 + child->next = parent->next;
1.93 + parent->next = child;
1.94 +
1.95 + if (lock) { SECMOD_ReleaseWriteLock(lock); }
1.96 +}
1.97 +
1.98 +
