Re: [boost] Boost.Process 0.5 released

Subject: Re: [boost] Boost.Process 0.5 released
From: Oliver Kowalke (oliver.kowalke_at_[hidden])
Date: 2012-08-22 00:19:26

Am 22.08.2012 00:35, schrieb Boris Schaeling:
> On Sun, 19 Aug 2012 23:21:00 +0200, Oliver Kowalke 
> <oliver.kowalke_at_[hidden]> wrote:
>
> Hi Oliver,
>
>> How is asynch. signal handling done?
>>
>> int status; boost::asio::signal_set set(io_service, SIGCHLD);
>> set.async_wait( [&status](const boost::system::error_code&, int) { 
>> ::wait(&status); } );
>>
>> Please note that on POSIX you are limited on what you can do inside a 
>> signal handler (must not call non-reentrant functions)!
>> I suggest you do not invoke the callback from the user in the signal 
>> handler - instead you set inside the signal handler a flag indicating 
>> the io-demultiplexer (io_service) to call the associated callback if 
>> you have returned from the signal handler (io_service has to continue 
>> with dispatching).
>
> I'm not sure whether I understand. Is this a general recommendation 
> for others? Or you think there is something wrong with the code from 
> the example?
>
I'm sorry - the signal handling (signal reactor) is implemented by asio. 
I've to take a look into its implementation.
Sorry for the noise.

Oliver