Re: [boost] [thread] 2 questions about thread interruption

Subject: Re: [boost] [thread] 2 questions about thread interruption
From: Andrzej Krzemienski (akrzemi1_at_[hidden])
Date: 2016-04-18 17:50:43

2016-04-18 23:42 GMT+02:00 Andrzej Krzemienski <akrzemi1_at_[hidden]>:

> Hi,
> I have two questions connected to thread interruption in Boost.Thread.
>
> *1.* The docs say that interrupt_and_join_if_joinable is defined as
> follows:
>
> ```
> struct interrupt_and_join_if_joinable{
>
>   void operator()(thread& t)
>   {
>     t.interrupt();
>     if (t.joinable())
>     {
>       t.join();
>     }
>   }};
>
> ```
>

Sorry, let me continue with the question. Is there a reason why
t.interrupt() is called without checking if t is joinable? This looks
uncomfortable to me that I would be potentially calling interrupt() on a
not-a-thread.

*2.* When I make a call to this_thread::wait_for(), blocking for a long
time in thread t2, and the instant later I call t2.interrupt() from another
thread t1. Do I have to wait the long time until wait_for() stops blocking
t2, or does thread_interrupted get called 'immediately' after interrupt()
is called from t1?

*3.* Does the support for interruption points require the other
synchronization operations (like locks on mutexes) to be slower (in order
to monitor interruption requests)?

Regards,
&rzej