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Date: Tue, 1 Oct 2002 16:10:19 -0400 (EDT)
From: Garrett Wollman <wollman@lcs.mit.edu>
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To: Robert Watson <rwatson@FreeBSD.org>
Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/kern kern_synch.c
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<<On Tue, 1 Oct 2002 11:24:07 -0400 (EDT), Robert Watson <rwatson@FreeBSD.org> said:

> Yeah, the notion of signals and threads is still a bit cloudy in my mind. 

POSIX makes this quite clear:

# 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. Signals which are generated by some action
# attributable to a particular thread, such as a hardware fault, shall
# be generated for the thread that caused the signal to be
# generated. Signals that are generated in association with a process
# ID or process group ID or an asynchronous event, such as terminal
# activity, shall be generated for the process.

See the System Interfaces volume of 1003.1-2001, section 2.4, for a
complete discussion of signal delivery.  (Note that the POSIX
threading model is not the only one possible, and we may wish to
provide for more general signal delivery.)

-GAWollman


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