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 10:27:39

Am 10.02.2011 15:03, schrieb Artyom:
> Probably it would be ok to provide some parameter
> on how to wait asynchronously:
>
> typedef enum {
>     wait_default,           // using thread+waitpid per-process on POSIX OS
>     wait_using_sigaction,   // install signal handler
>     wait_using_sigwaitinfo, // install signal handler
>     wait_polling,           // poll all waiting pids for end, when
>                             // requested - for example by user's signal
>                             // handler
> } wait_method_type;
>
>
>
> void async_wait(pid ,method_type m = wait_default)
> #ifdef BOOST_POSIX
> void poll_handlers(); // check if child completed
>                        // called by user when receives sigchld
> endif

I believe this won't work because:
On POSIX the interaction of signal-handlers and threads is not defined 
(it is not defined which thread gets the signal delivered).
The recommended solution is to block the signals for all threads and 
declare a special thread which blocks in sigwait() for the desired signals.

Oliver