NetBSD Problem Report #45146

From www@NetBSD.org  Thu Jul 14 16:26:52 2011
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Date: Thu, 14 Jul 2011 16:26:52 +0000 (UTC)
From: o.vd.linden@quicknet.nl
Reply-To: o.vd.linden@quicknet.nl
To: gnats-bugs@NetBSD.org
Subject: sigwait() cancellation point 
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>Number:         45146
>Category:       lib
>Synopsis:       sigwait() cancellation point
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 14 16:30:00 +0000 2011
>Originator:     Onno van der Linden
>Release:        5.99.53 i386
>Organization:
>Environment:
NetBSD sheep 5.99.53 NetBSD 5.99.53 (SHEEP) #0: Thu Jun 16 21:15:01 MEST 2011  onno@sheep:/usr/src/sys/arch/i386/compile/SHEEP i386

>Description:
pthread_testcancel(3) contains a list of functions that should have a cancellation point.

- clock_nanosleep() mentioned in pthread_testcancel(3) should probably be clock()
- sem_timedwait() mentioned in pthread_testcancel(3) should probably be sem_trywait()
- waitid() mentioned in pthread_testcancel(3) should be ????
- pkg/45131 contains a fix for csup that's wrong. It looks like sigwait() (implemented in libc as a wrapper around sigtimedwait()) isn't calling  the sigtimedwait() wrapper in pthread_cancelstub.c when using sigwait() in a thread (like csup does)
>How-To-Repeat:
See pkg/45131
>Fix:
pthread_testcancel(3) should contain the changes mentioned earlier.
sigwait() cancellation point could be fixed with another entry in pthread_cancelstub.c but that doesn't look right to me.

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