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/* 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
/*
* 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 reading.
* Note: this uses a non-reentrant lock. Writers are given preference.
*/
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);
}
}