1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 // -*- c++ -*- 19 // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 20 21 // OSCL_MUTEX (M U T E X I M P L E M E N T A T I O N) 22 23 // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 24 25 26 /*! \file oscl_mutex.cpp .This file provides MUTEX implementation that can be ported 27 to three OS LINUX, SYMBIAN & WIN32 28 */ 29 30 #include "oscl_mutex.h" 31 32 33 #include "oscl_assert.h" 34 35 OSCL_EXPORT_REF OsclMutex::OsclMutex() 36 { 37 bCreated = false; 38 } 39 40 OSCL_EXPORT_REF OsclMutex::~OsclMutex() 41 { 42 //make sure it's closed 43 if (bCreated) 44 Close(); 45 } 46 47 /* 48 * Creates the Mutex 49 * 50 * @param MutexName NULL terminated string. 51 * 52 * @return Returns the Error whether it is success or failure 53 *incase of failure it will return what is the specific error 54 */ 55 OSCL_EXPORT_REF OsclProcStatus::eOsclProcError OsclMutex::Create() 56 { 57 if (bCreated) 58 return OsclProcStatus::INVALID_OPERATION_ERROR; 59 60 61 int result = pthread_mutex_init(&ObjMutex, NULL); 62 if (result == 0) 63 { 64 bCreated = true; 65 return OsclProcStatus::SUCCESS_ERROR; 66 } 67 else 68 return ErrorMapping(result); 69 70 71 } 72 73 74 /** 75 * Locks the Mutex 76 * 77 * @param It wont take any parameters 78 * 79 * @return Returns the Error whether it is success or failure 80 *incase of failure it will return what is the specific error 81 */ 82 OSCL_EXPORT_REF void OsclMutex::Lock() 83 { 84 //verify the mutex is created. 85 OSCL_ASSERT(bCreated); 86 87 88 pthread_mutex_lock(&ObjMutex); 89 90 } 91 92 93 /** 94 * Try to lock the mutex,if the Mutex is already locked calling thread 95 * immediately returns with out blocking 96 * @param It wont take any parameters 97 * 98 * @return Returns the Error whether it is success or failure 99 *incase of failure it will return what is the specific error 100 */ 101 OSCL_EXPORT_REF OsclProcStatus::eOsclProcError OsclMutex::TryLock() 102 { 103 if (!bCreated) 104 return OsclProcStatus::INVALID_OPERATION_ERROR; 105 106 107 int result = pthread_mutex_trylock(&ObjMutex); 108 switch (result) 109 { 110 case 0: 111 return OsclProcStatus::SUCCESS_ERROR; 112 case EBUSY: 113 return OsclProcStatus::MUTEX_LOCKED_ERROR; 114 default: 115 return ErrorMapping(result); 116 } 117 118 } 119 120 /** 121 * Releases the Mutex 122 * 123 * @param It wont take any parameters 124 * 125 * @return Returns the Error whether it is success or failure 126 *incase of failure it will return what is the specific error 127 */ 128 OSCL_EXPORT_REF void OsclMutex::Unlock() 129 { 130 //verify the mutex is created. 131 OSCL_ASSERT(bCreated); 132 133 134 pthread_mutex_unlock(&ObjMutex); 135 136 } 137 138 139 140 /** 141 * Closes the Mutex 142 * 143 * @param It wont take any prameters 144 * 145 * @return Returns the Error whether it is success or failure 146 *incase of failure it will return what is the specific error 147 */ 148 OSCL_EXPORT_REF OsclProcStatus::eOsclProcError OsclMutex::Close() 149 { 150 if (!bCreated) 151 return OsclProcStatus::INVALID_OPERATION_ERROR; 152 153 154 int result = pthread_mutex_destroy(&ObjMutex); 155 if (result == 0) 156 { 157 bCreated = false; 158 return OsclProcStatus::SUCCESS_ERROR; 159 } 160 else 161 return ErrorMapping(result); 162 163 } 164 165 166 167 /** 168 * Error Mapping 169 * 170 * @param It will take error returned by OS specific API 171 * 172 * @return Returns specific error 173 */ 174 OsclProcStatus::eOsclProcError OsclMutex::ErrorMapping(int32 Error) 175 { 176 177 178 switch (Error) 179 { 180 case 0: 181 return OsclProcStatus::SUCCESS_ERROR; 182 case EAGAIN : 183 return OsclProcStatus::SYSTEM_RESOURCES_UNAVAILABLE_ERROR; 184 case EINVAL : 185 return OsclProcStatus::INVALID_ARGUMENT_ERROR; 186 case ENOMEM : 187 return OsclProcStatus::NOT_ENOUGH_MEMORY_ERROR; 188 case EFAULT : 189 return OsclProcStatus::INVALID_POINTER_ERROR; 190 case EBUSY: 191 return OsclProcStatus::MUTEX_LOCKED_ERROR; 192 default: 193 return OsclProcStatus::OTHER_ERROR; 194 } 195 196 } 197 198 OSCL_EXPORT_REF OsclThreadLock::OsclThreadLock() 199 { 200 iMutex.Create(); 201 } 202 OSCL_EXPORT_REF OsclThreadLock::~OsclThreadLock() 203 { 204 iMutex.Close(); 205 } 206 OSCL_EXPORT_REF void OsclThreadLock::Lock() 207 { 208 iMutex.Lock(); 209 } 210 OSCL_EXPORT_REF void OsclThreadLock::Unlock() 211 { 212 iMutex.Unlock(); 213 } 214 215
