Date: Wed, 23 Feb 2011 15:22:02 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Alexander Best <arundel@freebsd.org> Cc: Kostik Belousov <kostikbel@gmail.com>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, John Baldwin <jhb@freebsd.org> Subject: Re: svn commit: r218967 - head/sys/kern Message-ID: <201102231522.02362.hselasky@c2i.net> In-Reply-To: <20110223135734.GA62693@freebsd.org> References: <20110223131228.GN78089@deviant.kiev.zoral.com.ua> <20110223135734.GA62693@freebsd.org>
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On Wednesday 23 February 2011 14:57:34 Alexander Best wrote: > On Wed Feb 23 11, Kostik Belousov wrote: > > On Wed, Feb 23, 2011 at 12:56:25PM +0000, John Baldwin wrote: > > > Author: jhb > > > Date: Wed Feb 23 12:56:25 2011 > > > New Revision: 218967 > > > URL: http://svn.freebsd.org/changeset/base/218967 > > > > > > Log: > > > Fix off-by-one error in check against max_threads_per_proc. > > > > > > Submitted by: arundel > > > MFC after: 1 week > > > > > > Modified: > > > head/sys/kern/kern_thr.c > > > > > > Modified: head/sys/kern/kern_thr.c > > > ======================================================================= > > > ======= --- head/sys/kern/kern_thr.c Wed Feb 23 10:28:37 2011 (r218966) > > > +++ head/sys/kern/kern_thr.c Wed Feb 23 12:56:25 2011 (r218967) @@ > > > -153,7 +153,7 @@ create_thread(struct thread *td, mcontex > > > > > > p = td->td_proc; > > > > > > /* Have race condition but it is cheap. */ > > > > > > - if (p->p_numthreads >= max_threads_per_proc) { > > > + if (p->p_numthreads > max_threads_per_proc) { > > > > > > ++max_threads_hits; > > > return (EPROCLIM); > > > > > > } > > > > I do not think there was off by one error. The create_thread() function > > is called to create new thread, and before the process thread counter > > is incremented in thread_link(). The old test tried to not allow more > > then max_threads_per_proc threads in a process, now it allows to > > create max_threads_per_proc. > > doesn't the semantics of the term "maximum" imply that it's own value is > also valid? > > if a sign says maximum weight 2000kg, does that mean that a weight of > 2000kg is invalid and the highest valid weight is 1999,999..kg? Hi, The sign should have used terms like EQ and GTE and LTE and a granularity. Obviously not all people writing important numerical information are programmers ;-) --HPS
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