source: vscpl/test/testcondvar.cc

// Copyright (c) 2012 by István Váradi

// This file is part of libxplcommon, a common utility library for
// development related to X-Plane

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:

// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.

//------------------------------------------------------------------------------

#include <hu/varadiistvan/scpl/Thread.h>
#include <hu/varadiistvan/scpl/Mutex.h>
#include <hu/varadiistvan/scpl/CondVar.h>

#include <cstdlib>
#include <cstdio>
#include <cassert>

#include <signal.h>

#include <sys/time.h>

//------------------------------------------------------------------------------

using hu::varadiistvan::scpl::Thread;
using hu::varadiistvan::scpl::Mutex;
using hu::varadiistvan::scpl::CondVar;

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

class Thread1 : public Thread
{
private:
    char id;

    Mutex& mutex;

    CondVar& condVar;

public:
    Thread1(char id, Mutex& mutex, CondVar& condVar);

    virtual void run();
};

//------------------------------------------------------------------------------

inline Thread1::Thread1(char id, Mutex& mutex, CondVar& condVar) :
    id(id),
    mutex(mutex),
    condVar(condVar)
{
}

//------------------------------------------------------------------------------

void Thread1::run()
{
    printf("Thread1[%c]::run: locking, and waiting on the condition\n", id);
    mutex.lock();
    condVar.wait(mutex);
    printf("Thread1[%c]::run: condition received, waiting again\n", id);
    condVar.wait(mutex);
    printf("Thread1[%c]::run: condition received again, waiting with timeout\n", id);

    bool result = condVar.wait(mutex, 5000);
    printf("Thread1[%c]::run: waiting finished, %s\n", id,
           result ? "received condition" : "timed out");
    mutex.unlock();
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

class Thread2 : public Thread
{
private:
    Mutex& mutex;

    CondVar& condVar;

public:
    Thread2(Mutex& mutex, CondVar& condVar);

    virtual void run();
};

//------------------------------------------------------------------------------

inline Thread2::Thread2(Mutex& mutex, CondVar& condVar) :
    mutex(mutex),
    condVar(condVar)
{
}

//------------------------------------------------------------------------------

void Thread2::run()
{
    printf("Thread2::run: sleeping\n");
    sleep(2000);
    printf("------------------------------------------------------------\n");

    printf("Thread2::run: woke up, signalling condition variable\n");
    condVar.signal();

    printf("Thread2::run: sleeping...\n");
    sleep(2000);
    printf("------------------------------------------------------------\n");

    printf("Thread2::run: woke up, broadcasting condition variable\n");
    condVar.broadcast();

    printf("Thread2::run: sleeping...\n");
    sleep(2000);
    printf("------------------------------------------------------------\n");

    printf("Thread2::run: woke up, signalling condition variable\n");
    condVar.signal();

    printf("Thread2::run: sleeping...\n");
    sleep(2000);
    printf("------------------------------------------------------------\n");

    printf("Thread2::run: woke up, signalling condition variable\n");
    condVar.signal();
}

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

int main()
{
    Mutex mutex;
    CondVar condVar;

    Thread1 thread1('A', mutex, condVar);
    Thread1 thread1a('B', mutex, condVar);
    Thread2 thread2(mutex, condVar);

    printf("Starting threads\n");
    thread1.start();
    thread1a.start();
    thread2.start();

    printf("Waiting for thread1\n");
    thread1.join();
    thread1a.join();
    printf("Waiting for thread2\n");
    thread2.join();
    printf("Both threads returned\n");

    return 0;
}

//------------------------------------------------------------------------------

// Local Variables:
// mode: C++
// c-basic-offset: 4
// indent-tabs-mode: nil
// End: