Linux signal handling - notifying a condition variable

[Patrick Schluter]

On Thursday, 15 March 2018 at 19:23:26 UTC, Dmitry Olshansky 
wrote:
> On Thursday, 15 March 2018 at 17:30:50 UTC, Jim King wrote:
>> [...]
>
> Another option if you are on linux is to use eventfd. Then you 
> can trigger it with simple write on eventfd descriptor.
>
> As far as waiting goes it’s either read on descriptor or 
> poll/select.
> f it seems a bit more involved.
>> [...]
>
> However I’d be super careful about mutexes with signal 
> handlers. Really self-pipe trick or eventfd seems way more 
> signal safe.

There's also signalfd which is quite practical to change signals 
in select/poll/epoll events.