security/nss/lib/pk11wrap/pk11list.c@6474c204b198 (annotated)
security/nss/lib/pk11wrap/pk11list.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | /* |
| michael@0 | 5 | * Locking and queue management primatives |
| michael@0 | 6 | * |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "seccomon.h" |
| michael@0 | 10 | #include "nssilock.h" |
| michael@0 | 11 | #include "secmod.h" |
| michael@0 | 12 | #include "secmodi.h" |
| michael@0 | 13 | #include "secmodti.h" |
| michael@0 | 14 | #include "nssrwlk.h" |
| michael@0 | 15 | |
| michael@0 | 16 | /* |
| michael@0 | 17 | * create a new lock for a Module List |
| michael@0 | 18 | */ |
| michael@0 | 19 | SECMODListLock *SECMOD_NewListLock() |
| michael@0 | 20 | { |
| michael@0 | 21 | return NSSRWLock_New( 10, "moduleListLock"); |
| michael@0 | 22 | } |
| michael@0 | 23 | |
| michael@0 | 24 | /* |
| michael@0 | 25 | * destroy the lock |
| michael@0 | 26 | */ |
| michael@0 | 27 | void SECMOD_DestroyListLock(SECMODListLock *lock) |
| michael@0 | 28 | { |
| michael@0 | 29 | NSSRWLock_Destroy(lock); |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | |
| michael@0 | 33 | /* |
| michael@0 | 34 | * Lock the List for Read: NOTE: this assumes the reading isn't so common |
| michael@0 | 35 | * the writing will be starved. |
| michael@0 | 36 | */ |
| michael@0 | 37 | void SECMOD_GetReadLock(SECMODListLock *modLock) |
| michael@0 | 38 | { |
| michael@0 | 39 | NSSRWLock_LockRead(modLock); |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | /* |
| michael@0 | 43 | * Release the Read lock |
| michael@0 | 44 | */ |
| michael@0 | 45 | void SECMOD_ReleaseReadLock(SECMODListLock *modLock) |
| michael@0 | 46 | { |
| michael@0 | 47 | NSSRWLock_UnlockRead(modLock); |
| michael@0 | 48 | } |
| michael@0 | 49 | |
| michael@0 | 50 | |
| michael@0 | 51 | /* |
| michael@0 | 52 | * lock the list for Write |
| michael@0 | 53 | */ |
| michael@0 | 54 | void SECMOD_GetWriteLock(SECMODListLock *modLock) |
| michael@0 | 55 | { |
| michael@0 | 56 | NSSRWLock_LockWrite(modLock); |
| michael@0 | 57 | } |
| michael@0 | 58 | |
| michael@0 | 59 | |
| michael@0 | 60 | /* |
| michael@0 | 61 | * Release the Write Lock: NOTE, this code is pretty inefficient if you have |
| michael@0 | 62 | * lots of write collisions. |
| michael@0 | 63 | */ |
| michael@0 | 64 | void SECMOD_ReleaseWriteLock(SECMODListLock *modLock) |
| michael@0 | 65 | { |
| michael@0 | 66 | NSSRWLock_UnlockWrite(modLock); |
| michael@0 | 67 | } |
| michael@0 | 68 | |
| michael@0 | 69 | |
| michael@0 | 70 | /* |
| michael@0 | 71 | * must Hold the Write lock |
| michael@0 | 72 | */ |
| michael@0 | 73 | void |
| michael@0 | 74 | SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child) |
| michael@0 | 75 | { |
| michael@0 | 76 | *parent = child->next; |
| michael@0 | 77 | child->next = NULL; |
| michael@0 | 78 | } |
| michael@0 | 79 | |
| michael@0 | 80 | /* |
| michael@0 | 81 | * if lock is not specified, it must already be held |
| michael@0 | 82 | */ |
| michael@0 | 83 | void |
| michael@0 | 84 | SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child, |
| michael@0 | 85 | SECMODListLock *lock) |
| michael@0 | 86 | { |
| michael@0 | 87 | if (lock) { SECMOD_GetWriteLock(lock); } |
| michael@0 | 88 | |
| michael@0 | 89 | child->next = parent->next; |
| michael@0 | 90 | parent->next = child; |
| michael@0 | 91 | |
| michael@0 | 92 | if (lock) { SECMOD_ReleaseWriteLock(lock); } |
| michael@0 | 93 | } |
| michael@0 | 94 | |
| michael@0 | 95 |
