Re: [PATCH/RFC 1/5] mingw: make fgetc raise SIGINT if apropriate

[Erik Faye-Lund <kusmabite@gmail.com>]

On Fri, Nov 30, 2012 at 6:58 PM, Johannes Schindelin
<Johannes.Schindelin@gmx.de> wrote:
> Hi,
>
> On Tue, 13 Nov 2012, Erik Faye-Lund wrote:
>
>> Set a control-handler to prevent the process from terminating, and
>> simulate SIGINT so it can be handled by a signal-handler as usual.
>
> One thing you might want to mention is that the fgetc() handling is not
> thread-safe, and intentionally so: if two threads read from the same
> console, we are in trouble anyway.

I'm not entirely sure if I know what you mean. Do you suggest that two
threads can race for setting the console ctrl-handler? I don't think
that's the case; "SetConsoleCtrlHandler(x, TRUE)" adds a console
handler to the handler-chain, and SetConsoleCtrlHandler(x, FALSE)
removes it. If two threads add handlers, it is my understanding that
one of them will be run, only to report "no, no more ctrl-handling
needed". Since both handlers block further ctrl-handling, I don't
think there's a problem.

Do you care to clarify what your thread-safety complaint is?

> BTW I like the new mingw_raise() very much!

Thanks! I originally implemented it for a different reason, but that
patch didn't turn out to be useful, so it's nice to finally put it to
use ;)

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