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: 2009-11-08 17:45:02

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?

Peter Dimov-5 wrote:
> 
> exit() will not hang, it will just terminate the thread (and all other 
> threads) as its very last step (after invoking the atexit handlers and 
> global/static destructors). 
> 

But what happens if one of the handlers is itself waiting for the thread to
shut down?
Also, is at_thread_exit() implemented as an atexit() handler under the hood?
If not, how do you prevent it from killing the hook functions prematurely?

Thanks,
Gili
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