xref: /aosp_15_r20/hardware/interfaces/nfc/aidl/vts/functional/CondVar.h (revision 4d7e907c777eeecc4c5bd7cf640a754fac206ff7)

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  Encapsulate a condition variable for thread synchronization.
 */

#pragma once
#include <pthread.h>

#include <mutex>

class CondVar {
  public:
    /*******************************************************************************
    **
    ** Function:        CondVar
    **
    ** Description:     Initialize member variables.
    **
    ** Returns:         None.
    **
    *******************************************************************************/
    CondVar();

    /*******************************************************************************
    **
    ** Function:        ~CondVar
    **
    ** Description:     Cleanup all resources.
    **
    ** Returns:         None.
    **
    *******************************************************************************/
    ~CondVar();

    /*******************************************************************************
    **
    ** Function:        wait
    **
    ** Description:     Block the caller and wait for a condition.
    **
    ** Returns:         None.
    **
    *******************************************************************************/
    void wait(std::mutex& mutex);

    /*******************************************************************************
    **
    ** Function:        wait
    **
    ** Description:     Block the caller and wait for a condition.
    **                  millisec: Timeout in milliseconds.
    **
    ** Returns:         True if wait is successful; false if timeout occurs.
    **
    *******************************************************************************/
    bool wait(std::mutex& mutex, long millisec);

    /*******************************************************************************
    **
    ** Function:        notifyOne
    **
    ** Description:     Unblock the waiting thread.
    **
    ** Returns:         None.
    **
    *******************************************************************************/
    void notifyOne();

  private:
    pthread_cond_t mCondition;
};