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To: Daniel Eischen <deischen@freebsd.org>
References: <Pine.GSO.4.43.0410311647550.23450-100000@sea.ntplx.net>
From: des@des.no (=?iso-8859-1?q?Dag-Erling_Sm=F8rgrav?=)
Date: Mon, 01 Nov 2004 23:24:15 +0100
In-Reply-To: <Pine.GSO.4.43.0410311647550.23450-100000@sea.ntplx.net> (Daniel
 Eischen's message of "Sun, 31 Oct 2004 17:00:46 -0500 (EST)")
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cc: Brian Fundakowski Feldman <green@freebsd.org>
cc: src-committers@freebsd.org
cc: cvs-all@freebsd.org
cc: cvs-src@freebsd.org
Subject: Re: cvs commit: src/lib/libpthread/thread thr_mutex.c
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Daniel Eischen <deischen@freebsd.org> writes:
> We use error check mutexes by default, which is allowed by the
> spec, because they come at no cost [...]

They come at considerable cost.  They make it impossible to use the
Boehm garbage collector in threaded programs, for instance, because
pthread_mutex_init() calls malloc() which tries to use a mutex.  There
is probably a significant performance penalty as well.

DES
--=20
Dag-Erling Sm=F8rgrav - des@des.no