Date: Sat, 20 Jun 1998 08:39:02 +1000 (EST) From: John Birrell <jb@cimlogic.com.au> To: smoergrd@oslo.geco-prakla.slb.com (Dag-Erling Coidan Smørgrav) Cc: hackers@FreeBSD.ORG Subject: Re: Signals in POSIX threads Message-ID: <199806192239.IAA22404@cimlogic.com.au> In-Reply-To: <rx4yautd2gg.fsf@oslo.geco-prakla.slb.com> from =?ISO-8859-1?Q?Dag=2DErling_Coidan_Sm=F8rgrav?= at "Jun 19, 98 02:02:23 pm"
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Dag-Erling Coidan Smørgrav wrote: > This is not strictly FreeBSD-related, but I thought I'd ask here since > many of you are probably working with pthreads at some level. > > Is there any way to force all (or specific) signals sent to a process > to be sent to a particular thread? The behaviour I'm seeing now¹ is > that the signal is going to a seemingly random thread². Wether the > signal handler is being installed before or after the threads are > started doesn't seem to make a difference. > > I asked a colleague at Geco about it, and his answer was "Whatever you > want to do, find a way to do it that doesn't involve signals." Not > very helpful :) POSIX threaded processes only have one set of signal handlers but a thread specific signal mask. POSIX says that "at the time of generation, a determination shall be made whether the signal has been generated for the process or for a specific thread within the process". But without each thread being able to choose a signal handler, it is not really very useful. I'd agree with your colleague. 8-) It is best to write threaded applications to work in the presence of signals, but to avoid using them for anything thread specific. What are you doing that _needs_ signals? -- John Birrell - jb@cimlogic.com.au; jb@freebsd.org http://www.cimlogic.com.au/ CIMlogic Pty Ltd, GPO Box 117A, Melbourne Vic 3001, Australia +61 418 353 137 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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