[592] in Pthreads mailing list archive
Re: pthread_cancel and cleanup handlers
daemon@ATHENA.MIT.EDU (Craig Taverner)
Wed Mar 12 07:52:25 1997
Date: Wed, 12 Mar 1997 14:35:45 +0200 (SAT)
From: Craig Taverner <craig@hobbes.gh.wits.ac.za>
To: pthreads@MIT.EDU
In-Reply-To: <332048F5.7C093EC7@healthcare.com>
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Hi again,
I seem to have found a bug in the LinuxThreads package of Xavier Leroy. I
did some pthread development under solaris 2.5 (using the solaris version
of pthreads) and found that the include file macros for
pthread_cleanup_push() and pthread_cleanup_pop() required that they both
by used in the same block of code (due to extra '{' and '}' braces in the
macros). This is not critical, but it clearly in inconvenience.
When I ported my code to Linux using LinuxThreads, I found a substantially
more serious problem with the cleanup handlers, and that was that they
were only called by pthread_exit() (which the solaris ones do not do).
This meant that the cancelling a thread with pthread_cancel did not call
the cleanup handler under linux, but did under solaris, and pthread_exit()
did call the handler under linux but not under solaris.
What is the correct posix behavior here? My solaris code had (presumably
incorrectly) the cleanup handler ending with pthread_exit() which caused
the clenaup handler to call itself recursively under linux.
Cheers, Craig
- ------
"One Page Principle:
A specification that will not fit on one page of 8.5x11 inch
paper cannot be understood."
-- Mark Ardis
Craig Taverner
Structural Chemistry, University of the Witwatersrand, South Africa
tel: +27-11-716-2290 fax: +27-11-716-3826
email: craig@hobbes.gh.wits.ac.za
www: http://www.gh.wits.ac.za/craig
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