CODEWITHSUNDEEP
javawindows-7java-native-interfacethread-sleep
user1805280
user1805280

Reputation: 261

Accurate Sleep in milliseconds in Java / C

I am looking for a way to pause a thread for accurate number of milliseconds in Java or C (I can use JNI to access the C method.

So far, I was using the following in java code.

LinkedBlockingQueue<String> SLEEPER = new LinkedBlockingQueue<String>();
SLEEPER.poll(msTime, TimeUnit.MILLISECONDS);

This was suggested on one of the threads in this forum and worked great on most of our windows7 machines.

But it is not giving me accrate results on a new set of hardware. So I decided to use JNI to access C. But even this does not pause for accurate amount of milliseconds on new hardwares (Dell and HP on Windows7).

JNIEXPORT void JNICALL Java_JniTimer_jniWait(JNIEnv *env, jobject obj , jint waitTime )              {

HANDLE hWaitEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
   if (hWaitEvent) 
    {

    WaitForSingleObject(hWaitEvent,waitTime);
        CloseHandle (hWaitEvent);
    }
    }

Does anyone have a reliable option for accurate sleep on thread. Thanks.

Upvotes: 0

Views: 641

Answers (1)

avishayp
avishayp

Reputation: 706

You can't do that on a non RT OS.

Not so much due to the resolution of timers, but because the per thread 'time slice' (sometimes referred to as quantum), is usually set to a few ms (15 on my antique xp here), and is not something you can just play with.

Upvotes: 4

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