--- 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
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