Re: [boost] Subject: Formal Review of Proposed Boost.Process library starts tomorrow

Subject: Re: [boost] Subject: Formal Review of Proposed Boost.Process library starts tomorrow
From: Oliver Kowalke (k-oli_at_[hidden])
Date: 2011-02-10 11:29:53

Am 10.02.2011 17:11, schrieb Artyom:
> Small notes:
>
>    1. waitpid should be done for specific pid I waiting for
>       to allow other threads to use wait
>    2. You need to use WNOHANG so it would not be blocking,
>       and allow to check specific ids.

You would create for each child process you want to wait for a separat 
thread? Wouldn't this degrade the performance of the system if you have 
to wait for many processes? Why not using only one thread which handles 
SIGCHLD and catches all child stati?

> So basically such thread need
>
>    forever (
>      sigwait(sigchld)
>      foreach pid in waiting set
>         if(waitpid(pid, WNOHANG) = done)
>            notify io_service
>            remove pid from waiting set
>    }

you iterate over the complete set of pids you are waiting for. why not
let waitpid( -1,...) let tell which child has changed its status.

Shouldn't the wait-functionality be interrupt-able?
How to do a grace full shutdown if forever blocking?

Oliver