/src/nss/lib/pk11wrap/pk11list.c
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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 | | */ |
8 | | |
9 | | #include "seccomon.h" |
10 | | #include "nssilock.h" |
11 | | #include "secmod.h" |
12 | | #include "secmodi.h" |
13 | | #include "secmodti.h" |
14 | | #include "nssrwlk.h" |
15 | | |
16 | | /* |
17 | | * create a new lock for a Module List |
18 | | */ |
19 | | SECMODListLock * |
20 | | SECMOD_NewListLock() |
21 | 0 | { |
22 | 0 | return NSSRWLock_New(10, "moduleListLock"); |
23 | 0 | } |
24 | | |
25 | | /* |
26 | | * destroy the lock |
27 | | */ |
28 | | void |
29 | | SECMOD_DestroyListLock(SECMODListLock *lock) |
30 | 0 | { |
31 | 0 | NSSRWLock_Destroy(lock); |
32 | 0 | } |
33 | | |
34 | | /* |
35 | | * Lock the list for reading. |
36 | | * Note: this uses a non-reentrant lock. Writers are given preference. |
37 | | */ |
38 | | void |
39 | | SECMOD_GetReadLock(SECMODListLock *modLock) |
40 | 0 | { |
41 | 0 | NSSRWLock_LockRead(modLock); |
42 | 0 | } |
43 | | |
44 | | /* |
45 | | * Release the Read lock |
46 | | */ |
47 | | void |
48 | | SECMOD_ReleaseReadLock(SECMODListLock *modLock) |
49 | 0 | { |
50 | 0 | NSSRWLock_UnlockRead(modLock); |
51 | 0 | } |
52 | | |
53 | | /* |
54 | | * lock the list for Write |
55 | | */ |
56 | | void |
57 | | SECMOD_GetWriteLock(SECMODListLock *modLock) |
58 | 0 | { |
59 | 0 | NSSRWLock_LockWrite(modLock); |
60 | 0 | } |
61 | | |
62 | | /* |
63 | | * Release the Write Lock: NOTE, this code is pretty inefficient if you have |
64 | | * lots of write collisions. |
65 | | */ |
66 | | void |
67 | | SECMOD_ReleaseWriteLock(SECMODListLock *modLock) |
68 | 0 | { |
69 | 0 | NSSRWLock_UnlockWrite(modLock); |
70 | 0 | } |
71 | | |
72 | | /* |
73 | | * must Hold the Write lock |
74 | | */ |
75 | | void |
76 | | SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child) |
77 | 0 | { |
78 | 0 | *parent = child->next; |
79 | 0 | child->next = NULL; |
80 | 0 | } |
81 | | |
82 | | /* |
83 | | * if lock is not specified, it must already be held |
84 | | */ |
85 | | void |
86 | | SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child, |
87 | | SECMODListLock *lock) |
88 | 0 | { |
89 | 0 | if (lock) { |
90 | 0 | SECMOD_GetWriteLock(lock); |
91 | 0 | } |
92 | |
|
93 | 0 | child->next = parent->next; |
94 | 0 | parent->next = child; |
95 | |
|
96 | 0 | if (lock) { |
97 | 0 | SECMOD_ReleaseWriteLock(lock); |
98 | 0 | } |
99 | 0 | } |