Article View: comp.windows.x
Article #37833Re: Problem with Signals
From: jeff
Date: Wed, 07 Mar 1990 23:33
Date: Wed, 07 Mar 1990 23:33
38 lines
1371 bytes
1371 bytes
In article <23695@masscomp.ccur.com> mitch@westford.ccur.com (Mitchel Kuninsky) writes:
:I envision a signal handler like:
:
: SignalHandler
: {
: sigFlag = TRUE;
: }
:
:and an XtMainLoop like:
:
: MyMainLoop()
: {
: XEvent event;
:
: for (;;)
: {
:(1) XtNextEvent( &event );
: if (event.type != NULL_EVENT) /* or something like this. */
: XtDispatchEvent( &event );
: if (sigFlag)
: {
: process signal.
: Inhibit signals.
: sigFlag = FALSE;
:(2) Enable signals.
: }
: }
: }
This may be kind of nit-picking, but ... You have a nasty race here.
What if a signal arrives between the re-enabling of signals at (2) and
the next call to XtNextEvent at (1).
I believe this points out the need to have the signal-handling more
tightly integrated with the Intrinsics code.
---
Jeff
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<203@samna.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!uflorida!mephisto!gatech!galbp!samna!jeffReferences:
<9002281729.AA02895@wilkins.bcm.tmc.edu> <132399@sun.Eng.Sun.COM> <23695@masscomp.ccur.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!uflorida!mephisto!gatech!galbp!samna!jeff From: jeff@samna.UUCP (jeff) Newsgroups: comp.windows.x Subject: Re: Problem with Signals Message-ID: <203@samna.UUCP> Date: 7 Mar 90 23:33:58 GMT References: <9002281729.AA02895@wilkins.bcm.tmc.edu> <132399@sun.Eng.Sun.COM> <23695@masscomp.ccur.com> Reply-To: jeff@samna.UUCP (Jeff Barber) Organization: Samna Corporation, Atlanta Lines: 38