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From: Richard Stallman <rms@gnu.org>
Cc: jan.h.d@swipnet.se, emacs-devel@gnu.org
Subject: Re: Core dumps in redisplay.
Date: Mon, 28 Feb 2005 09:49:02 -0500	[thread overview]
Message-ID: <E1D5mCk-00040t-9g@fencepost.gnu.org> (raw)
In-Reply-To: <x5vf8dk7zq.fsf@lola.goethe.zz> (message from David Kastrup on Sun, 27 Feb 2005 22:28:41 +0100)

    This sounds like normally only the main thread should ever be touching
    interrupt_input_blocked, unless we have a bug.  Correct?  So we need
    not think about how to synchronize accesses to the variable, but
    rather make sure that no thread except the main thread will ever run
    code touching it.  Correct?

That is one coherent design plan.  It may not be the only one.

Meanwhile, operations carried out in another thread are somewhat like
operations carried out in a signal handler.  So in some cases it may
be necessary for other threads to wait for interrupt_input_blocked to
be 0 before they do their work.

And unless those threads have strictly higher priority than the main
thread, we have to worry about locking: how to prevent the main thread
from continuing and entering code that does BLOCK_INPUT while the
other thread is doing something that's supposed to be blocked by
BLOCK_INPUT.

  parent reply	other threads:[~2005-02-28 14:49 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-02-26 13:40 Core dumps in redisplay David Kastrup
2005-02-27 13:43 ` Richard Stallman
2005-02-27 18:56   ` David Kastrup
2005-02-27 20:08     ` Jan D.
2005-02-27 20:21       ` David Kastrup
2005-02-27 20:35         ` Jan D.
2005-02-27 21:28           ` David Kastrup
2005-02-27 22:08             ` Kim F. Storm
2005-02-28  5:34             ` Jan D.
2005-02-28 10:38               ` David Kastrup
2005-02-28 17:15                 ` Jan D.
2005-02-28 17:46                   ` David Kastrup
2005-02-28 19:09                     ` Jan D.
2005-02-28 19:38                       ` David Kastrup
2005-02-28 20:05                         ` Jan D.
2005-02-28 20:29                           ` David Kastrup
2005-02-28 17:14               ` David Kastrup
2005-02-28 14:49             ` Richard Stallman [this message]
2005-03-04 18:54               ` Jan D.
2005-02-27 21:51     ` Stefan Monnier
2005-02-27 22:36       ` David Kastrup

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