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Date: Tue, 14 Sep 2010 09:40:03 GMT
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To: freebsd-bugs@FreeBSD.org
From: Tijl Coosemans <tijl@coosemans.org>
Cc: 
Subject: Re: kern/131597: [kernel] c++ exceptions very slow on FreeBSD
	7.1/amd64
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The following reply was made to PR kern/131597; it has been noted by GNATS.

From: Tijl Coosemans <tijl@coosemans.org>
To: jhb@freebsd.org
Cc: bug-followup@freebsd.org, guillaume@morinfr.org, kan@freebsd.org,
        davidxu@freebsd.org, kostikbel@gmail.com
Subject: Re: kern/131597: [kernel] c++ exceptions very slow on FreeBSD 7.1/amd64
Date: Tue, 14 Sep 2010 11:35:48 +0200

 On Thu, Jul 08, 2010 at 11:29:50AM -0400, John Baldwin wrote:
 > ...longjmp(3) isn't safe in a signal context...
 
 POSIX says it's supposed to be safe:
 
   "As it bypasses the usual function call and return mechanisms,
   longjmp() shall execute correctly in contexts of interrupts, signals,
   and any of their associated functions. However, if longjmp() is
   invoked from a nested signal handler (that is, from a function
   invoked as a result of a signal raised during the handling of another
   signal), the behavior is undefined."