[Devel] Re: multi-threaded app fails to restart

[John Paul Walters]

>
> Hi John,
>
> I just pushed a few more fixes related to signals to ckpt-v22-dev.
> Can you please see if they fix your problem ?
>
> Also, can you please post the test program that you are using, so
> we can try to replicate the problem ?
>
> Note that it is usually ok for sys_restart() to return -512 -- it
> means that the process/thread was interrupted when the checkpoint,
> and it will now retry the same syscall from then.
>
> You can use the -F (--freezer) switch of restart(1) to freeze the
> restarted tasks/threads before they are allowed to run in userspace.
> Using it you can tell whether the other thread dies immediately
> after restart, or is not at all restarted.
>
> Thanks,
>
> Oren.
>

Hi Oren,

I grabbed the most recent v22-dev that includes the updates.  I'm
still experiencing the same issue.  Testing with -F indicates that the
second thread isn't being restarted.  The code that I'm using is:

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/syscall.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>

#define OUTFILE "/tmp/cr-self.out"

void *
func (void *arg)
{
  FILE *file;
  int counter = 0;

  file = fopen(OUTFILE, "w+");

    while (1){
        sleep(2);
        counter++;
        fprintf(file, "Count %d\n", counter);
        fflush(file);
    }

return NULL;
}

int
main (int argc, char **argv)
{
  pthread_t thread;
  close (0);
  close (1);
  close (2);
  unlink (OUTFILE);

  pthread_create(&thread, NULL, func, NULL);
  pthread_join(thread, NULL);
  return 0;
}

Thanks for your help,
JP
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