1 /* 2 * Copyright (C) 2012 The Android Open Source Project 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 express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* 18 * Encapsulate a condition variable for thread synchronization. 19 */ 20 21 #pragma once 22 #include <pthread.h> 23 #include "Mutex.h" 24 25 26 class CondVar 27 { 28 public: 29 /******************************************************************************* 30 ** 31 ** Function: CondVar 32 ** 33 ** Description: Initialize member variables. 34 ** 35 ** Returns: None. 36 ** 37 *******************************************************************************/ 38 CondVar (); 39 40 41 /******************************************************************************* 42 ** 43 ** Function: ~CondVar 44 ** 45 ** Description: Cleanup all resources. 46 ** 47 ** Returns: None. 48 ** 49 *******************************************************************************/ 50 ~CondVar (); 51 52 53 /******************************************************************************* 54 ** 55 ** Function: wait 56 ** 57 ** Description: Block the caller and wait for a condition. 58 ** 59 ** Returns: None. 60 ** 61 *******************************************************************************/ 62 void wait (Mutex& mutex); 63 64 65 /******************************************************************************* 66 ** 67 ** Function: wait 68 ** 69 ** Description: Block the caller and wait for a condition. 70 ** millisec: Timeout in milliseconds. 71 ** 72 ** Returns: True if wait is successful; false if timeout occurs. 73 ** 74 *******************************************************************************/ 75 bool wait (Mutex& mutex, long millisec); 76 77 78 /******************************************************************************* 79 ** 80 ** Function: notifyOne 81 ** 82 ** Description: Unblock the waiting thread. 83 ** 84 ** Returns: None. 85 ** 86 *******************************************************************************/ 87 void notifyOne (); 88 89 private: 90 pthread_cond_t mCondition; 91 }; 92
