How to interupt the Sleeping thread in c++

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I am doing coding in vs 2008.

My code is:

C++

queue<int> globalqueue;
DWORD WINAPI popq(void *vp)
{
    while(1)
    {
        while(globalqueue.size() >0 )
        {
            EnterCriticalSection(&section);
            if( myqueue.size() > 0 )
            {
                printf("%d\n", myqueue.front());
                myqueue.pop();
            }
            LeaveCriticalSection(&section);
        }
        sleep(1000*60);
    }
    return 0;
}

Another function will insert into the queue. If data is not available in the queue to pop I am sleeping for 60 sec.
Here i don't want to sleep. If any data I am pushing into the queue I need to wake up the thread immediately.

Is there any way to achieve that?

Posted 10-Jul-13 21:38pm

@BangIndia

Updated 11-Jul-13 4:51am

pasztorpisti

v4

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SoMad 11-Jul-13 3:44am

Look into WaitForSingleObject() (and WaitForMultipleObjects()), using an event to signal your thread to resume processing.

Soren Madsen

[no name] 11-Jul-13 4:12am

This is the correct answer. This approach will also allow you to stop your thread gracefully which your current construct does not allow.

@BangIndia 11-Jul-13 5:05am

which handle i have to use inside the WaitForSingleObject() ..
Its require a object rite.

SoMad 11-Jul-13 5:16am

That would typically be a handle to an event. See this complete sample using WaitForMultipleObjects(): http://msdn.microsoft.com/en-us/library/windows/desktop/ms686915(v=vs.85).aspx[^]

Soren Madsen

2 solutions

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pasztorpisti · Accepted Answer · 2013-07-10T22:30:00

I have recently answered a question that contains a blocking queue template that probably suits your needs perfectly: Multi producer/consumer threads with condition variables...why don't work well?[^]. Read the answer carefully as it may contain a lot of useful info for you too. The stuff you need from my answer is the BlockingQueue template. You can interrupt the sleep at the end of program execution by placing a special item into the queue - in my example I used a NULL pointer for this.

Regarding the CRITICAL_SECTION + windows event combo: Events and critical sections (critical section == lock == mutex) are often used together to do synchronization between multiple threads. An event that is triggered multiple times (not just once) is almost always used with an accompanying lock (critical section or mutex or whatever). If you are a beginner I have a very nice advice for you regarding the use of criticalsection+event combo: Always wait for the event when you don't hold the lock, and always set/reset the event while you are holding the lock. (On holding the lock I mean being entered in the criticalsection). There are some exceptions to this rule but this one helped me a lot in writing correct code when I began with threading.

KarstenK · Accepted Answer · 2013-07-10T22:13:00

Solution 1

you can use WaitForMultipleObjects() API which also has a timeout. With the SetEvent() API you can trigger a loop.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms687025(v=vs.85).aspx[^]

Posted 10-Jul-13 22:13pm

KarstenK