src_corelib_thread_qwaitcondition_unix.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QWaitCondition>
#include <QMutex>
 
void do_something();
void sleep(int seconds);
 
 
void examples()
{
    QMutex mutex;
    QWaitCondition keyPressed;
    int count;
 
    //! [0]
    forever {
        mutex.lock();
        keyPressed.wait(&mutex);
        do_something();
        mutex.unlock();
    }
    //! [0]
 
 
    //! [1]
    forever {
        getchar();
        keyPressed.wakeAll();
    }
    //! [1]
 
 
    //! [2]
    forever {
        mutex.lock();
        keyPressed.wait(&mutex);
        ++count;
        mutex.unlock();
 
        do_something();
 
        mutex.lock();
        --count;
        mutex.unlock();
    }
    //! [2]
 
 
    //! [3]
    forever {
        getchar();
 
        mutex.lock();
        // Sleep until there are no busy worker threads
        while (count > 0) {
            mutex.unlock();
            sleep(1);
            mutex.lock();
        }
        keyPressed.wakeAll();
        mutex.unlock();
    }
    //! [3]
}