Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/pk11wrap/pk11list.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4 /*
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5 * Locking and queue management primatives
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6 *
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7 */
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8
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9 #include "seccomon.h"
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10 #include "nssilock.h"
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11 #include "secmod.h"
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12 #include "secmodi.h"
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13 #include "secmodti.h"
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14 #include "nssrwlk.h"
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15
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16 /*
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17 * create a new lock for a Module List
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18 */
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19 SECMODListLock *SECMOD_NewListLock()
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20 {
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21 return NSSRWLock_New( 10, "moduleListLock");
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22 }
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23
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24 /*
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25 * destroy the lock
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26 */
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27 void SECMOD_DestroyListLock(SECMODListLock *lock)
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28 {
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29 NSSRWLock_Destroy(lock);
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30 }
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31
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32
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33 /*
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34 * Lock the List for Read: NOTE: this assumes the reading isn't so common
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35 * the writing will be starved.
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36 */
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37 void SECMOD_GetReadLock(SECMODListLock *modLock)
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38 {
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39 NSSRWLock_LockRead(modLock);
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40 }
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41
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42 /*
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43 * Release the Read lock
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44 */
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45 void SECMOD_ReleaseReadLock(SECMODListLock *modLock)
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46 {
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47 NSSRWLock_UnlockRead(modLock);
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48 }
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49
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50
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51 /*
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52 * lock the list for Write
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53 */
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54 void SECMOD_GetWriteLock(SECMODListLock *modLock)
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55 {
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56 NSSRWLock_LockWrite(modLock);
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57 }
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58
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59
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60 /*
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61 * Release the Write Lock: NOTE, this code is pretty inefficient if you have
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62 * lots of write collisions.
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63 */
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64 void SECMOD_ReleaseWriteLock(SECMODListLock *modLock)
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65 {
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66 NSSRWLock_UnlockWrite(modLock);
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67 }
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68
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69
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70 /*
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71 * must Hold the Write lock
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72 */
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73 void
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74 SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)
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75 {
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76 *parent = child->next;
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77 child->next = NULL;
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78 }
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79
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80 /*
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81 * if lock is not specified, it must already be held
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82 */
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83 void
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84 SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,
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85 SECMODListLock *lock)
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86 {
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87 if (lock) { SECMOD_GetWriteLock(lock); }
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88
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89 child->next = parent->next;
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90 parent->next = child;
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91
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92 if (lock) { SECMOD_ReleaseWriteLock(lock); }
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93 }
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94
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95
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