re-creating/re-opening thread in C++

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Hello
I'm implementing a MFC S/W and it has two buttons to create a thread to log data and cancel it.
When a button "start" is clicked, it supposed to create a thread by

C++

hThread_log = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)LogData_thr, this, NULL, &thrId_log);

The function LogData_thr has while(1) in it.
And when a button "stop" is clicked, it supposed to stop the thread.
I tried TerminateThread() with CloseHandle() and some flag variable which breaks the infinite loop in the function LogData_thr.
However, every trial caused a problem when I put "start" button after stopping the thread (after the function is returned).
Something unwanted happens inside the function LogData_thr.
How can I manipulate the thread?
I always appreciate your help you have given to me.

Posted 7-Jul-15 23:10pm

Member 11499804

Updated 11-Jul-15 4:31am

Frankie-C

v5

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Frankie-C 11-Jul-15 10:34am

What means "Something unwanted happens inside the function LogData_thr" ?
What happens when you call it the second time?
Can you show us part of the LogData_thr code?

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KarstenK · Accepted Answer · 2015-07-07T23:29:00

Solution 1

There is the function TerminateThread for such issues. I like more setting a global variable which is checked for exiting the thread by its own, so it can do some cleanup.

Posted 7-Jul-15 23:29pm

KarstenK