Kill a running thread

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What happens if we forcefully kill a running thread

I have a thread namely RecordThread() which calls some complex and time consuming functions. In these functions I am using try-catch blocks, allocating and deallocation memory and using critical section variables etc.

like

  void RecordThread()
  {
    AddRecord();
    FindRecord();
    DeleteRecord();
    // ...
    ExitThread(0);
   } 

After creating this thread, I am immediately killing it before the thread completes its execution. In this case what happens if the thread is forcefully killed? Do the internal functions (AddRecord, DeleteRecord) complete their execution after we killed the thread?

After creating this thread, I am immediately killing it before the thread completes its execution.

I assume you mean you are using TerminateThread() in the following fashion:

HANDLE thread = CreateThread(...);

// ...
// short pause or other action?
// ...

TerminateThread(thread, 0); // Dangerous source of errors!
CloseHandle(thread);

If that is the case, then no, the thread executing RecordThread() will be stopped exactly where it is at the time that the other thread calls TerminateThread(). As per the notes in the TerminateThread() documentation, this exact point is somewhat random and depends on complex timing issues which are out of your control. This implies that you can't handle proper cleanup inside a thread and thus, you should rarely, if ever, kill a thread.

The proper way to request the thread to finish is by using WaitForSingleObject() like so:

HANDLE thread = CreateThread(...);

// ...
// some other action?
// ...

// you can pass a short timeout instead and kill the thread if it hasn't
// completed when the timeout expires.
WaitForSingleObject(thread, INFINITE);
CloseHandle(thread);

Killing threads in Java, public void start() {. worker = new Thread( this );. worker.start();. } public void stop​() {. running.set( false );. } public void run() {. running.set( true );. The best way ( and what Sun recommends ) to kill a running thread is to use a state-based logic, like a flag or something that can be inspected in the run method. You will have to do this twice in your run method, once before entering into the method using a if-loop and then inside the method at regular intervals using some kind of polling logic.

killing thread is the last resort - as Andre stated it leaves data in unknown state, you should never do that if thread works on shared object. Better choices are to notify thread to finish work by:

-using global volatile (important) variable which is changed only by main thread and tested by workers -using signal type synchronization objects (mainly Events) also set by main thread and tested by workers

How to Kill a Java Thread, getLogger(IndexProcessor.class); private volatile boolean running = true; public void terminate() { running = false; } @Override public void run() { while (running)  In Python, any alive non-daemon thread blocks the main program to exit. Whereas, daemon threads themselves are killed as soon as the main program exits. In other words, as soon as the main program exits, all the daemon threads are killed. To declare a thread as daemon, we set the keyword argument, daemon as True.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms682659%28v=vs.85%29.aspx

ExitThread is the preferred method of exiting a thread in C code. However, in C++ code, the thread is exited before any destructors can be called or any other automatic cleanup can be performed. Therefore, in C++ code, you should return from your thread function.

However the function calls will of course be completed because they're called before the ExitThread().

How to properly stop the Thread in Java?, //Keep the task in while loop. //This will make thread continue to run until flag becomes false. while (flag). {. System.out.println( "I am running. Terminating a thread has the following results:Any resources owned by the thread, such as windows and hooks, are freed.The thread exit code is set.The thread object is signaled.If the thread is the only active thread in the process, the process is terminated.

example of Thread that works well:

definition in *.h ------------------------------------

DWORD WINAPI Th_EspectroIF(LPVOID lpData);

CThread th_espectro(Th_EspectroIF);

use in *.cc -----------------------------------

DWORD WINAPI Th_EspectroIF(LPVOID lpData)
{

//Your code...

th_espectro.Stop(true);//stop this Thread 

}

call the Thread with: th_espectro.Start();

How To Stop A Thread In Java With An Example?, Have you ever wondered how to kill long running Java thread? Do you have any of below questions? Kill/Stop a thread after certain period of  We've added an interrupt() method that sets our running flag to false and calls the worker thread's interrupt() method. If the thread is sleeping when this is called, sleep() will exit with an InterruptedException, as would any other blocking call. This returns the thread to the loop, and it will exit since running is false.

How to stop/kill long running Java Thread at runtime? timed-out , Whenever we want to stop a thread from running state by calling stop() method of Thread class in Java.This method stops the execution of a  How to Terminate a Thread in C# In C#, a thread can be terminated using Abort() method. Abort() throws ThreadAbortException to the thread in which it called. Due to this exception, the thread is terminated.

How can we stop a thread in Java?, Whenever you want to stop the running thread, just call the stopThread() method. class StopThread extends Thread { /* Setting the volatile variable exit to false  One of the easy approaches is to use thread to show if a Thread is running or not and use this flag to take corrective action based on your requirement, here is a sample code outlining how to Kill Java Thread using a flag.

How to Stop a Thread in Java with Examples, Earlier there was a stop method exists in Thread Class but Java deprecated that method citing some System.out.println("Thread is running");. Note that it is a bad idea to bluntly "kill" threads. Each thread should be properly designed with a way to stop it from the main program. Just because there exists functions to kill threads, doesn't mean that you should start design your thread functions in a poor manner. – Lundin Nov 8 '12 at 8:47

Comments
  • To make it more explicit: TerminateThread can kill your thread in the middle of an i++ statement. It doesn't try to look for "nice" points such as function calls.
  • Note that POSIX is much different from Win32 API in this respect (by default, unless the thread modified its cancellation settings), it will indeed only kill your thread at a cancellation point. So apart from being dangerous, it's not even equally dangerous everywhere, and thus not "portable" :-)
  • If it's not obvious from the other comments, some more reasons why you should never use TerminateThread: Windows started picking up the really big pieces of TerminateThread garbage on the sidewalk, but it's still garbage on the sidewalk
  • What if they don't have enough time to complete?
  • @sharptooth like in single-threaded code, sequential consistency guarantees that all the lines before ExitThread() will complete.
  • Welcome to Stack Overflow. Code-only answers are discouraged. How is this answer different from or better than previous answers?