[omniORB] Lockup on Solaris 2.5.1 with Y2K patch

[Poilpret Jean Francois]

Hi,

It seems to me that in your sample there is something you do not =
(cannot) master : when the "theInstance" of class killer is created.
Anyway, it is certain it is created BEFORE the main(), ie before you get =
opportunity to initialize the cond and mutex. I'm sorry because I don't =
know much about pthreads, so I don't know if this kind of initializing =
is necessary in this case (maybe it only intializes structures to 0; in =
such case, it is just the same as the way global variables will be =
inited before the main() starts ; in fact, maybe this is the issue : are =
you sure that cond and mutex are all zeros before "theInstance" gets =
instantiated.

Just my two cents ;-)

    Jean-Fran=E7ois

-----Original Message-----
From: Sai-Lai Lo <S.Lo@uk.research.att.com>
To: omniorb-list@uk.research.att.com <omniorb-list@uk.research.att.com>
Date: mardi 22 juin 1999 06:05
Subject: Re: [omniORB] Lockup on Solaris 2.5.1 with Y2K patch


>The problem seems to occur only on one machine at our site. I'm able to
>produce a lockup with this simple test:
>
>The problematic machine is a dual processor ultra 2. I've tested the =
same
>program on a 14-processor, a 4-processor, and various uniprocessor =
solaris
>machines. Only one machine has this problem. So the problem may just be
>a special combination of patches. In any case, it is worth checking if =
this
>is causing problem with your machines.
>
>Sai-Lai
>
>------------------- cut here  =
-------------------------------------------
>// $ CC -o thr thr.cc -mt -lposix4
>// $ while [ 1 ]; do ./thr; done
>#include <pthread.h>
>#include <iostream.h>
>#include <time.h>
>
>pthread_cond_t  cond;
>pthread_mutex_t mutex;
>pthread_t       thr;
>int             died =3D 0;
>
>extern "C"=20
>void*
>worker(void* ptr)
>{
>  while (!died) {
>    struct timespec abs;
>    clock_gettime(CLOCK_REALTIME,&abs);
>    abs.tv_sec +=3D 1;
>    pthread_mutex_lock(&mutex);
>    pthread_cond_timedwait(&cond,&mutex,&abs);
>    pthread_mutex_unlock(&mutex);
>  }
>  cerr << "worker exit" << endl;
>  pthread_exit(0);
>  return 0;
>}
>
>class killer {
>public:
>  ~killer() {
>    void** status =3D 0;
>    pthread_mutex_lock(&mutex);
>    died =3D 1;
>    pthread_mutex_unlock(&mutex);
>    pthread_join(thr,status);
>    cerr << "killer done." << endl;
>  }
>  static killer theInstance;
>};
>
>killer killer::theInstance;
>
>
>
>int
>main(int,char**)
>{
>  pthread_cond_init(&cond,0);
>  pthread_mutex_init(&mutex,0);
> =20
>  pthread_attr_t attr;
>
>  pthread_attr_init(&attr);
>
>  pthread_create(&thr,&attr,worker,0);
>  return 0;
>}
>--------------------------------------------------------------------
>
>
>
>--=20
>Sai-Lai Lo                                   S.Lo@uk.research.att.com
>AT&T Laboratories Cambridge           WWW:   =
http://www.uk.research.att.com=20
>24a Trumpington Street                Tel:   +44 1223 343000
>Cambridge CB2 1QA                     Fax:   +44 1223 313542
>ENGLAND
>
>
>