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/security/nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_mutex.c

http://github.com/zpao/v8monkey
C | 196 lines | 92 code | 34 blank | 70 comment | 4 complexity | 087e3eef9fd75b58bf886ca2ff16955c MD5 | raw file
  1/* ***** BEGIN LICENSE BLOCK *****
  2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  3 *
  4 * The contents of this file are subject to the Mozilla Public License Version
  5 * 1.1 (the "License"); you may not use this file except in compliance with
  6 * the License. You may obtain a copy of the License at
  7 * http://www.mozilla.org/MPL/
  8 *
  9 * Software distributed under the License is distributed on an "AS IS" basis,
 10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 11 * for the specific language governing rights and limitations under the
 12 * License.
 13 *
 14 * The Original Code is the PKIX-C library.
 15 *
 16 * The Initial Developer of the Original Code is
 17 * Sun Microsystems, Inc.
 18 * Portions created by the Initial Developer are
 19 * Copyright 2004-2007 Sun Microsystems, Inc.  All Rights Reserved.
 20 *
 21 * Contributor(s):
 22 *   Sun Microsystems, Inc.
 23 *
 24 * Alternatively, the contents of this file may be used under the terms of
 25 * either the GNU General Public License Version 2 or later (the "GPL"), or
 26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 27 * in which case the provisions of the GPL or the LGPL are applicable instead
 28 * of those above. If you wish to allow use of your version of this file only
 29 * under the terms of either the GPL or the LGPL, and not to allow others to
 30 * use your version of this file under the terms of the MPL, indicate your
 31 * decision by deleting the provisions above and replace them with the notice
 32 * and other provisions required by the GPL or the LGPL. If you do not delete
 33 * the provisions above, a recipient may use your version of this file under
 34 * the terms of any one of the MPL, the GPL or the LGPL.
 35 *
 36 * ***** END LICENSE BLOCK ***** */
 37/*
 38 * pkix_pl_mutex.c
 39 *
 40 * Mutual Exclusion (Lock) Object Functions
 41 *
 42 */
 43
 44#include "pkix_pl_mutex.h"
 45
 46/* --Private-Functions-------------------------------------------- */
 47
 48/*
 49 * FUNCTION: pkix_pl_Mutex_Destroy
 50 * (see comments for PKIX_PL_DestructorCallback in pkix_pl_system.h)
 51 */
 52static PKIX_Error *
 53pkix_pl_Mutex_Destroy(
 54        PKIX_PL_Object *object,
 55        void *plContext)
 56{
 57        PKIX_PL_Mutex *mutex = NULL;
 58
 59        PKIX_ENTER(MUTEX, "pkix_pl_Mutex_Destroy");
 60        PKIX_NULLCHECK_ONE(object);
 61
 62        /* Sanity check: Test that "object" is a mutex */
 63        PKIX_CHECK(pkix_CheckType(object, PKIX_MUTEX_TYPE, plContext),
 64                    PKIX_OBJECTNOTMUTEX);
 65
 66        mutex = (PKIX_PL_Mutex*) object;
 67
 68        PKIX_MUTEX_DEBUG("\tCalling PR_DestroyLock).\n");
 69        PR_DestroyLock(mutex->lock);
 70        mutex->lock = NULL;
 71
 72cleanup:
 73
 74        PKIX_RETURN(MUTEX);
 75}
 76
 77/*
 78 * FUNCTION: pkix_pl_Mutex_RegisterSelf
 79 * DESCRIPTION:
 80 *  Registers PKIX_MUTEX_TYPE and its related functions with systemClasses[]
 81 * THREAD SAFETY:
 82 *  Not Thread Safe - for performance and complexity reasons
 83 *
 84 *  Since this function is only called by PKIX_PL_Initialize, which should
 85 *  only be called once, it is acceptable that this function is not
 86 *  thread-safe.
 87 */
 88PKIX_Error *
 89pkix_pl_Mutex_RegisterSelf(
 90        /* ARGSUSED */ void *plContext)
 91{
 92
 93        extern pkix_ClassTable_Entry systemClasses[PKIX_NUMTYPES];
 94        pkix_ClassTable_Entry entry;
 95
 96        PKIX_ENTER(MUTEX, "pkix_pl_Mutex_RegisterSelf");
 97
 98        entry.description = "Mutex";
 99        entry.objCounter = 0;
100        entry.typeObjectSize = sizeof(PKIX_PL_Mutex);
101        entry.destructor = pkix_pl_Mutex_Destroy;
102        entry.equalsFunction = NULL;
103        entry.hashcodeFunction = NULL;
104        entry.toStringFunction = NULL;
105        entry.comparator = NULL;
106        entry.duplicateFunction = NULL;
107
108        systemClasses[PKIX_MUTEX_TYPE] = entry;
109
110        PKIX_RETURN(MUTEX);
111}
112
113/* --Public-Functions--------------------------------------------- */
114
115/*
116 * FUNCTION: PKIX_PL_Mutex_Create (see comments in pkix_pl_system.h)
117 */
118PKIX_Error *
119PKIX_PL_Mutex_Create(
120        PKIX_PL_Mutex **pNewLock,
121        void *plContext)
122{
123        PKIX_PL_Mutex *mutex = NULL;
124
125        PKIX_ENTER(MUTEX, "PKIX_PL_Mutex_Create");
126        PKIX_NULLCHECK_ONE(pNewLock);
127
128        PKIX_CHECK(PKIX_PL_Object_Alloc
129                    (PKIX_MUTEX_TYPE,
130                    sizeof (PKIX_PL_Mutex),
131                    (PKIX_PL_Object **)&mutex,
132                    plContext),
133                    PKIX_COULDNOTCREATELOCKOBJECT);
134
135        PKIX_MUTEX_DEBUG("\tCalling PR_NewLock).\n");
136        mutex->lock = PR_NewLock();
137
138        /* If an error occurred in NSPR, report it here */
139        if (mutex->lock == NULL) {
140                PKIX_DECREF(mutex);
141                PKIX_ERROR_ALLOC_ERROR();
142        }
143
144        *pNewLock = mutex;
145
146cleanup:
147
148        PKIX_RETURN(MUTEX);
149}
150
151/*
152 * FUNCTION: PKIX_PL_Mutex_Lock (see comments in pkix_pl_system.h)
153 */
154PKIX_Error *
155PKIX_PL_Mutex_Lock(
156        PKIX_PL_Mutex *mutex,
157        void *plContext)
158{
159        PKIX_ENTER(MUTEX, "PKIX_PL_Mutex_Lock");
160        PKIX_NULLCHECK_ONE(mutex);
161
162        PKIX_MUTEX_DEBUG("\tCalling PR_Lock).\n");
163        PR_Lock(mutex->lock);
164
165        PKIX_MUTEX_DEBUG_ARG("(Thread %u just acquired the lock)\n",
166                        (PKIX_UInt32)PR_GetCurrentThread());
167
168        PKIX_RETURN(MUTEX);
169}
170
171/*
172 * FUNCTION: PKIX_PL_Mutex_Unlock (see comments in pkix_pl_system.h)
173 */
174PKIX_Error *
175PKIX_PL_Mutex_Unlock(
176        PKIX_PL_Mutex *mutex,
177        void *plContext)
178{
179        PRStatus result;
180
181        PKIX_ENTER(MUTEX, "PKIX_PL_Mutex_Unlock");
182        PKIX_NULLCHECK_ONE(mutex);
183
184        PKIX_MUTEX_DEBUG("\tCalling PR_Unlock).\n");
185        result = PR_Unlock(mutex->lock);
186
187        PKIX_MUTEX_DEBUG_ARG("(Thread %u just released the lock)\n",
188                        (PKIX_UInt32)PR_GetCurrentThread());
189
190        if (result == PR_FAILURE) {
191                PKIX_ERROR_FATAL(PKIX_ERRORUNLOCKINGMUTEX);
192        }
193
194cleanup:
195        PKIX_RETURN(MUTEX);
196}