Re: [Boost-users] at_thread_exit() never getting called

Subject: Re: [Boost-users] at_thread_exit() never getting called
From: cowwoc (cowwoc_at_[hidden])
Date: 2009-11-09 13:23:07

Peter Dimov-5 wrote:
> 
> cowwoc wrote:
>> Peter Dimov-5 wrote:
>>> 
>>> cowwoc wrote:
>>>> One of my threads has the following logic:
>>>> 
>>>> {
>>>>  at_thread_exit(myHook);
>>>>  while (!shutdownRequested)
>>>>  {
>>>>    // do stuff
>>>>  }
>>>> }
>>>> 
>>>> myHook()
>>>> {
>>>>  shutdownRequested = true;
>>>> }
>>>> 
>>>>       Following your scenario, doesn't this mean that the shutdown
>>>> hook will never get executed? What will happen? Will exit() hang
>>>> forever?
>>> 
>>> It will never get executed. The hook is executed AFTER the thread
>>> exits. 
>>> 
>> 
>> So how do you propose I implement the use-case I mentioned?
> 
> This way:
> 
> void threadproc()
> {
>     while( !shutdownRequested ) { ... }
> }
> 
> void signal_thread_to_exit_and_wait()
> {
>     shutdownRequested = true;
>     // join thread
> }
> 
> int main()
> {
>     // start thread
>     atexit( signal_thread_to_exit_and_wait );
>     // ...
> } // exit( 0 ) happens here
> 

That's exactly what I wanted. Thanks Peter!

PS: Is there a more reliable mechanism than atexit() that is guaranteed to
support more than 32 hooks?

Thanks,
Gili
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