Checking if a thread is working

Posted 17 Dec '12 - 2:57

Daniel Verbatim Hallam361

Sergey Alexandrovich Kryukov - 17 Dec '12 - 10:04

Why, exactly? —SA

Solution 1

That depends on what you mean by "working". You can only get the status of a thread (IsRunning), but you cannot get the status of the code it's executing.

The only way to do that would be to rewrite the code your background thread is running to provide some sort of "heartbeat" or some other status variable or events that your parent code can check or subscribe to.

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Posted 17 Dec '12 - 3:17

Dave Kreskowiak258K

Comments

Daniel Verbatim Hallam - 17 Dec '12 - 9:22

Would I be right to assume that once the method the thread is executing has completed the thread would no longer be running?

Dave Kreskowiak - 17 Dec '12 - 9:33

Once the the code is done the thread dies. It will no longer be running.

Solution 2

Do you mean Managed Thread States [^]?

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Posted 17 Dec '12 - 3:20

CPallini245K

Comments

Daniel Verbatim Hallam - 17 Dec '12 - 9:24

Thats a useful link too, I was looking for something like that, thank you.

CPallini - 17 Dec '12 - 9:33

you are welcome.

Sergey Alexandrovich Kryukov - 17 Dec '12 - 9:57

This is useful, good to know, my 5, but... It's much better not to poll the thread at all and not depend on return. It's much better to design a thread to notify require set on completion; another approach is to wait for thread completion by Join, which is a blocking code, without wasteful polling; is some situations, this is exactly what should be done. This way, the real solution of the problem depends on the purpose OP did not share with us. —SA

Espen Harlinn - 17 Dec '12 - 12:33

5'ed!

Solution 3

CPallini answered you, but the polling of the thread for status is a sign of really wrong design.

In some situations, you need a blocking call System.Threading.Thread.Join. The calling thread will be put in wait state, sleeping without wasting any CPU cycles, until awakened by completion. Please see:
http://msdn.microsoft.com/en-us/library/system.threading.thread.join.aspx[^].

I see you already trying "if (working) thread.Join()", but this is pointless, really. Explain what you are trying to achieve, the purpose of it.

In other cases, it's the best for a thread to notify other threads on completion. How? It depends. Please see my comments to Solution 2.

—SA

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Posted 17 Dec '12 - 4:00

Sergey Alexandrovich Kryukov586K

Edited 17 Dec '12 - 4:04

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

0	Sergey Alexandrovich Kryukov	586
1	Maciej Los	255
2	Slacker007	240
3	Aarti Meswania	233
4	OriginalGriff	230

0	Sergey Alexandrovich Kryukov	9,118
1	OriginalGriff	7,134
2	CPallini	3,803
3	Rohan Leuva	3,135
4	Maciej Los	2,558

Checking if a thread is working

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Checking if a thread is working

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