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Re: Bug in sem_getvalue
- From: Jonathan Larmour <jlarmour at redhat dot com>
- To: jyl087 at netscape dot net
- Cc: eCos discussion <ecos-discuss at sources dot redhat dot com>
- Date: Mon, 08 Apr 2002 18:37:30 +0100
- Subject: [ECOS] Re: Bug in sem_getvalue
- Organization: Red Hat UK Ltd.
- References: <56612312.6B3D8494.00067016@netscape.net>
jyl087@netscape.net wrote:
>
> In "sem.cxx" ...
>
> I don't know what POSIX says about sem_getvalue, but at least my
> RH7.2 manpage on sem_getvalue says that:
>
> sem_getvalue should always return 0.
> *sval = retval;
There is indeed a mistake in sem_getvalue, although the man page is also
strictly incorrect with respect to the standard (although it may be correct
with respect to the Linux implementation). According to my spec:
"If sem is locked, then the value returned by sem_getvalue() shall be
either zero or a negative number whose absolute value represents the number
of processes waiting for the semaphore at some unspecified time during the
call."
Anyway, I've fixed this for the future. Thanks for the report.
Jifl
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