The Tor Browser: security/nss/lib/pk11wrap/pk11list.c@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     4 /*

     5  * Locking and queue management primatives

     6  *

     7  */

     9 #include "seccomon.h"

    10 #include "nssilock.h"

    11 #include "secmod.h"

    12 #include "secmodi.h"

    13 #include "secmodti.h"

    14 #include "nssrwlk.h"

    16 /*

    17  * create a new lock for a Module List

    18  */

    19 SECMODListLock *SECMOD_NewListLock()

    20 {

    21     return NSSRWLock_New( 10, "moduleListLock");

    22 }

    24 /*

    25  * destroy the lock

    26  */

    27 void SECMOD_DestroyListLock(SECMODListLock *lock)

    28 {

    29     NSSRWLock_Destroy(lock);

    30 }

    33 /*

    34  * Lock the List for Read: NOTE: this assumes the reading isn't so common

    35  * the writing will be starved.

    36  */

    37 void SECMOD_GetReadLock(SECMODListLock *modLock)

    38 {

    39     NSSRWLock_LockRead(modLock);

    40 }

    42 /*

    43  * Release the Read lock

    44  */

    45 void SECMOD_ReleaseReadLock(SECMODListLock *modLock)

    46 {

    47     NSSRWLock_UnlockRead(modLock);

    48 }

    51 /*

    52  * lock the list for Write

    53  */

    54 void SECMOD_GetWriteLock(SECMODListLock *modLock)

    55 {

    56     NSSRWLock_LockWrite(modLock);

    57 }

    60 /*

    61  * Release the Write Lock: NOTE, this code is pretty inefficient if you have

    62  * lots of write collisions.

    63  */

    64 void SECMOD_ReleaseWriteLock(SECMODListLock *modLock)

    65 {

    66     NSSRWLock_UnlockWrite(modLock);

    67 }

    70 /*

    71  * must Hold the Write lock

    72  */

    73 void

    74 SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)

    75 {

    76     *parent = child->next;

    77     child->next = NULL;

    78 }

    80 /*

    81  * if lock is not specified, it must already be held

    82  */

    83 void

    84 SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,

    85 							SECMODListLock *lock)

    86 {

    87     if (lock) { SECMOD_GetWriteLock(lock); }

    89     child->next = parent->next;

    90     parent->next = child;

    92    if (lock) { SECMOD_ReleaseWriteLock(lock); }

    93 }

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