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Date: Tue, 19 Nov 2013 09:00:01 GMT
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From: "Daniel M. Eischen" <eischen@vigrid.com>
Subject: Re: threads/184073: wrong signal delivery to multithreaded processes
 in Perl
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The following reply was made to PR threads/184073; it has been noted by GNATS.

From: "Daniel M. Eischen" <eischen@vigrid.com>
To: bug-followup@FreeBSD.org, Thomas.Eckardt@thockar.com
Cc:  
Subject: Re: threads/184073: wrong signal delivery to multithreaded processes
 in Perl
Date: Tue, 19 Nov 2013 03:40:34 -0500

 There is no guarantee in POSIX that the main thread receives a
 signal sent to the process if multiple threads (including the
 main thread) have the signal unblocked.  The only way to
 guarantee signal delivery to a specific thread is to send it
 directly to the desired thread, have all threads other than the
 desired thread mask the signal, or be blocked in sigwait{info}()
 from the desired thread at the time of signal delivery.  You
 are relying on behavior that is not specified by the standard.