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Re: Warning: Unstable POSIX threads support comitted to CVS

From: Mikael Djurfeldt
Subject: Re: Warning: Unstable POSIX threads support comitted to CVS
Date: Mon, 09 Dec 2002 18:40:40 +0100
User-agent: Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.2 (i386-pc-linux-gnu)

Marius Vollmer <address@hidden> writes:

> Mikael Djurfeldt <address@hidden> writes:
>> It is very irritating that signals are delivered to whatever thread
>> happens to run for the moment.
> Do you refer to the execution of POSIX signal handlers or to the
> execution of Scheme signal handlers?

With "delivered" I'm thinking of "end-point" delivery, that is
execution of Scheme signal handlers.  I'm thinking of channeling all
signals to a particular target thread (which becomes the one to run
its handlers until the target is switched).

> That is, signals-plus-threads are quite nasty on Linux.  I think we
> should have a dedicated signal handling thread that polls for signals
> and marks the relevant system asyncs when they arrive.

That sounds like a good solution.  Are there particular reasons why a
dedicated thread is needed rather than that an arbitrary POSIX signal
handler of an arbitrary receives the signal sets the asyncs of the
"foreground" thread?

I guess one such reason could be that we, in that case, could block
signals for all threads except the signal one, with the benefit that a
particular signal is only received "once" (rather than getting a
"barrage" of async marks at asyncronous points in time), right?


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