thread-priority

Setting a thread priority in a service has no effect [closed]

别说谁变了你拦得住时间么 提交于 2019-12-01 09:40:23
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . Is there some additional configuration needed before I can set thread priorities in a Windows service? In my service, I have a few threads that each call the CreateProcess() function to launch an external application. I would like to adjust thread (or process) priorities to normal or lower , depending on some

How can you ensure in java that a block of code can not be interrupted by any other thread

吃可爱长大的小学妹 提交于 2019-11-30 18:14:03
exampl: new Thread(new Runnable() { public void run() { while(condition) { *code that must not be interrupted* *some more code* } } }).start(); SomeOtherThread.start(); YetAntherThread.start(); How can you ensure that code that must not be interrupted won't be interrupted? You can't - at least not with normal Java, running on a normal, non-real-time operating system. Even if other threads don't interrupt yours, other processes might well do so. Basically you won't be able to guarantee that you get a CPU all to yourself until you're done. If you want this sort of guarantee you should use

Changing thread priority doesn't have an effect

我与影子孤独终老i 提交于 2019-11-29 07:07:38
问题 I'm trying to change priority of main thread using android.os.Process.setThreadPriority() . I have log messages before and after priority changing, here is code: public class TestActivity extends Activity { public final String TAG="TestActivity"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); int tid=(int)Thread.currentThread().getId(); Log.d(TAG,"priority before change = " + android.os.Process.getThreadPriority

Why *not* change the priority of a ThreadPool (or Task) thread?

泄露秘密 提交于 2019-11-27 23:28:22
There are many places across the web and Stack Overflow where one is discouraged from changing the priority of a ThreadPool thread or TPL Task . In particular: "You have no control over the state and priority of a thread pool thread." "The runtime manages the thread pool. You have no control over the scheduling of the thread, nor can you change the thread's priority." "You should not change the Culture or Priority or... of a PoolThread. Just like you don't paint or re-decorate a rental car." "There are several scenarios in which it is appropriate to create and manage your own threads instead

Java multithreading - thread priority

三世轮回 提交于 2019-11-27 16:03:41
Can anybody explain how thread priority works in java. The confusion here is if java does'nt guarantee the implementation of the Thread according to its priority then why is this setpriority() function used for. My code is as follows : public class ThreadSynchronization implements Runnable{ public synchronized void run() { System.out.println("Starting Implementation of Thread "+Thread.currentThread().getName()); for(int i=0;i<10;i++) { System.out.println("Thread "+Thread.currentThread().getName()+" value : "+i); } System.out.println("Ending Implementation of Thread "+Thread.currentThread()

Portable way of setting std::thread priority in C++11

拈花ヽ惹草 提交于 2019-11-27 11:39:46
What is the correct way in the post C++11 world for setting the priority of an instance of std::thread Is there a portable way of doing this that works at least in Windows and POSIX (Linux) environments? Or is it a matter of getting a handle and using whatever native calls are available for the particular OS? Mike Seymour There's no way to set thread priorities via the C++11 library. I don't think this is going to change in C++14, and my crystal ball is too hazy to comment on versions after that. In POSIX, pthread_setschedparam(thread.native_handle(), policy, {priority}); I don't know the

What is the 'realtime' process priority setting for?

怎甘沉沦 提交于 2019-11-27 00:49:38
问题 From what I've read in the past, you're encouraged not to change the priority of your Windows applications programmatically, and if you do, you should never change them to 'Realtime'. What does the 'Realtime' process priority setting do, compared to 'High', and 'Above Normal'? 回答1: A realtime priority thread can never be pre-empted by timer interrupts and runs at a higher priority than any other thread in the system. As such a CPU bound realtime priority thread can totally ruin a machine.

Setting priority to Java's threads

半腔热情 提交于 2019-11-26 20:46:25
I have a program that runs in a few threads. The main thread shares an object with the other threads and in the main I have a call to: synchronized(obj){ do stuff } I have a suspicion that the main thread is starved and isn't getting access to obj . How do I raise the priority of the main thread or is it already higher than the other threads by default? Macarse You have a setPriority() method in the Thread class. Check this javadoc . Setting thread priority to maximum: public static void main(String args[]) { Thread.currentThread().setPriority(Thread.MAX_PRIORITY); // Your main code. } The

Do Linux JVMs actually implement Thread priorities?

和自甴很熟 提交于 2019-11-26 20:25:36
问题 Wrote a quick Java proggy to spawn 10 threads with each priority and calculate pi (4*atan(1) method) with BigDecimals 500,000 times each, join on each thread and report the elapsed time for run method. Yeah, prob'ly not the best example, but keeping it basic. I'm aware of Bug4813310 It is non-trivial to do in C, but can we assume that native priorities are never set on Linux JVMs? $uname -r && grep bogomips /proc/cpuinfo 2.4.33.3 bogomips : 4312.26 $java -version 2>&1 |head -1 Java version "1

Java multithreading - thread priority

风格不统一 提交于 2019-11-26 17:12:34
问题 Can anybody explain how thread priority works in java. The confusion here is if java does'nt guarantee the implementation of the Thread according to its priority then why is this setpriority() function used for. My code is as follows : public class ThreadSynchronization implements Runnable{ public synchronized void run() { System.out.println("Starting Implementation of Thread "+Thread.currentThread().getName()); for(int i=0;i<10;i++) { System.out.println("Thread "+Thread.currentThread()