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

Subject: Re: [Boost-users] at_thread_exit() never getting called
From: Peter Dimov (pdimov_at_[hidden])
Date: 2009-11-08 17:56:57

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