Linux signal handling - notifying a condition variable

[James E. King III]

On Thursday, 15 March 2018 at 19:43:09 UTC, Patrick Schluter 
wrote:
> On Thursday, 15 March 2018 at 16:51:59 UTC, Jim King wrote:
>> I am trying to add graceful shutdown support to a test harness.
>>  In the test harness, a server class consumes a thread to 
>> accept connections and service them.  In order to stop the 
>> server, it has to be interrupted.  This interruption mechanism 
>> is based on core.sync.condition.
>>
>> I want to add a signal handler so that if SIGINT is received, 
>> the server is interrupted and stops gracefully.
>>
>
> signalfd [1] is a good solution on Linux.
>
> core.sys.linux.sys.signalfd;
>
> [1]: http://man7.org/linux/man-pages/man2/signalfd.2.html

Thank you, this looks like the best solution.  On further reading 
I found that
it is not safe to use condition variables from signal handlers, 
per the documentation in 
https://linux.die.net/man/3/pthread_cond_signal.