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Re: [PATCH] Implement open-process and related functions on MinGW


From: Eli Zaretskii
Subject: Re: [PATCH] Implement open-process and related functions on MinGW
Date: Sun, 23 Feb 2014 05:45:02 +0200

> From: Mark H Weaver <address@hidden>
> Cc: address@hidden,  address@hidden
> Date: Sat, 22 Feb 2014 17:02:35 -0500
> 
> Eli Zaretskii <address@hidden> writes:
> 
> >> From: Mark H Weaver <address@hidden>
> >> Cc: address@hidden (Ludovic Court├Ęs),  address@hidden
> >> Date: Sat, 22 Feb 2014 10:54:16 -0500
> >> 
> >> Thanks for working on this, but in a multithreaded program, it's no good
> >> to change the file descriptors in the main program temporarily before
> >> spawning, and then restore them afterwards.  We'll have to find another
> >> way of doing this.
> >
> > Btw, how does the Posix build work reliably when it forks after
> > several threads are already running?  I don't see any calls to
> > pthread_atfork or any similar machinery in place.  What am I missing?
> 
> It's safe to fork a multithreaded program without using pthread_atfork
> if only async-signal-safe functions are called before the exec.

You may know what your code does between fork and exec, but you don't
know what other parts do, like pthreads or the application that called
Guile as a library.




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