Resume Terminated Thread - D7

Posted on 2006-11-08
Medium Priority
Last Modified: 2008-03-15

I was wondering if it is possible to resume execution or re-execute a thread after it is terminated. I have used Suspend and Resume which work but they cause the program to sometimes hang unpredictably preventing my program from closing therefore I decided not to use them. I am using the thread for reading over an indy connection.

The thread object is created during application start (FormCreate) and terminated when the connection is disconnected. The thread object is not freed on termination (my choice FreeOnTerminate := False) so I guess the reference to the thread object is still valid. I would like to have just one thread on the client and I am avoiding creating the thread on each connect. I have read that the overhead in managing multiple threads can impact performance. I have also noticed I cannot free the thread object when my application is closing down (FormClose) coz it hangs on calling Free even though the thread is terminated before freeing it.
Question by:martbase
LVL 17

Accepted Solution

Wim ten Brink earned 400 total points
ID: 17905207
Nope. Once a thread is terminated, it's resources are gone too. All you have is the handle of the terminated process which could be used to get the final status of the thread and it's exitcode. But Windows has released all (well, most) of the resources it was using.

An application that hangs is often experiencing a deadlock, where two threads are waiting for each other to release a certain resource. Sometimes one of them will time-out but I've seen plenty of situation where the thread is waiting for an infinite amount of time for a resource to be released.
LVL 17

Assisted Solution

TheRealLoki earned 400 total points
ID: 17909101
if your program is hangingwhen you call suspend, then it probably means your thread is not checking "If terminated" or "suspended" often enough.
Hangs are avoidable as long as you are careful
can you paste your thread's on execute loop here?
Once we find the issue, and iron it out, you can carry on with just suspend and resume

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ID: 21133162
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