R: Cygwin PThreads bug?

[Marco Atzeri <marco_atzeri at yahoo dot it>]

--- Mer 4/3/09, Nicholas Sherlock  ha scritto:

> Da: Nicholas Sherlock 
> Oggetto: Cygwin PThreads bug?
> A: cygwin@cygwin.com
> Data: Mercoledì 4 marzo 2009, 02:29
> Hey everyone,
> 
> I'm writing a very thread-intensive application using
> Cygwin and Cygwin's PThreads implementation, and I'm
> running into a few problems. As far as I can tell from the
> spec:
> 
> http://www.opengroup.org/onlinepubs/000095399/functions/pthread_rwlock_rdlock.html
> 
> This C program:
> 
> #include <stdio.h>
> #include <pthread.h>
> #include <assert.h>
> #include <errno.h>
> 
> int main() {
> 	pthread_rwlock_t rw_lock;
> 
> 	pthread_rwlock_init(&rw_lock,NULL);
> 
> 	//Lock it once for read...
> 	assert(pthread_rwlock_rdlock(&rw_lock)==0);
> 	
> 	//Lock it again for read...
> 	int err=pthread_rwlock_rdlock(&rw_lock);
> 
> 	printf("Err %d\n", err);
> 
> 	assert (err==EAGAIN || err==0);
> 
> 	if (err!=EAGAIN)
> 	  pthread_rwlock_unlock(&rw_lock);
> 
> 	pthread_rwlock_unlock(&rw_lock);
> 
> 	pthread_rwlock_destroy(&rw_lock);
> 	
> 	return 0;
> }
> 
> Should run correctly. That is, the second call to
> pthread_rwlock_rdlock should either succeed (returning
> zero), having acquired the read lock a second time, or it
> should fail and return EAGAIN, if the number of simultaneous
> allowed read locks has been exceeded. It should not fail and
> return EDEADLK (45), which it is currently doing. Am I
> reading the spec wrong or is Cygwin non-conforming?
> 
> Cheers,
> Nicholas Sherlock
> 
> 
Hi Nicholas,

on 
$ uname -a
CYGWIN_NT-5.1 ITQMOZCAS2NB007 1.7.0(0.200/5/3) 2009-02-20 17:20 i686 Cygwin

compiled with gcc-4

$ ./pthread.exe 
Err 0


Regards
Marco


      Passa a Yahoo! Mail.

La webmail che ti offre GRATIS spazio illimitato, 
antispam e messenger integrato.
http://it.mail.yahoo.com/??????????????

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/