/* 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); }

}