Boost logo

Boost Users :

Subject: Re: [Boost-users] [Thread] Timed join returning true before thread terminated
From: Vicente J. Botet Escriba (vicente.botet_at_[hidden])
Date: 2012-03-09 02:02:13

Le 09/03/12 04:32, John Rocha a écrit :
> Hello,
> I'm working on a multi-threaded application that uses boost threads.
> The threads are deployed in a cascading mechanism such as:
> Main thread creates thread1
> thread 1 creates threads 2, 3 and 4
> thread 2 creates threads 5-14
> The shutdown mechanism is to send a thread interrupt and then do a
> timed join to wait for the child thread[s] to finish their shutdown.
> So Main sends a thread interrupt to thread1, and then waits for X seconds
> thread 1 sends a thread interrupt to thread 2, and does a timed wait,
> then thread 3 and wait then thread 4 and wait
> thread 2 does the same for each of its children: send a thread
> interrupt and then wait.
How and when thread1 starts the shutdown processing?
> The problem is, that on rare occasions (1 out of 474 attempts in my
> last test cycle), thread 1 will return early from the timed_join, and
> it returns true, indicating the child thread is dead -- but it's not.
> I have timed logging that shows when a specific threads, shutdown
> activities start and stop, and I can see that thread 1 isn't waiting
> 10 seconds for the child to exit, and I can see the child is still
> running.
> Any suggestions for this? The only thing I can think of right now is
> that maybe thread1 is getting an interrupt for something that is
> causing it to leave it's timed_join early? I haven't looked into the
> boost code for this yet. I'm hoping that this is something others have
> encountered and already solved?
> Or maybe other debugging tips could be provided?
Could you post a simple example? This would help to better analyze the


Boost-users list run by williamkempf at, kalb at, bjorn.karlsson at, gregod at, wekempf at