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Message-Id: <199810080634.XAA03264@hub.freebsd.org>
Date: Wed, 7 Oct 1998 23:34:56 -0700 (PDT)
From: rrs@lmi.net
To: freebsd-gnats-submit@FreeBSD.ORG
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Subject: misc/8202: semop() is not wrapped for thread safety in libc_r
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>Number:         8202
>Category:       misc
>Synopsis:       semop() is not wrapped for thread safety in libc_r
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Oct  7 23:40:00 PDT 1998
>Last-Modified:
>Originator:     Rob Schulhof
>Organization:
LanMinds Internet
>Release:        FreeBSD 3.0-19980930
>Environment:
FreeBSD schoolie.lmi.net 3.0-BETA FreeBSD 3.0-BETA #8: Wed Sep 30 20:33:07 PDT 1998
root@schoolie.lanminds.com:/usr/src/src/sys/compile/SCHOOL  i386 
>Description:
Semaphore operations are not thread safe.   If one thread sleeps waiting
on a semop() then all of the threads are suspended.
>How-To-Repeat:
Create a set of threads that wait on a single
semaphore value to reach zero,  increment the value for a finite time,
then decrement the value and exit.

       
>Fix:
Implement semop and semctl wrappers in libc_r.  I don't know if any
kernel mods are necessary.
>Audit-Trail:
>Unformatted:

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