Re: Spawning threads in KVM/QEMU

[Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Anthony Liguori wrote:
> Hi,
>
> I've been experimenting with creating IO threads for the PV device 
> drivers.  Unfortunately, my experiments haven't gotten very far as QEMU 
> tends to hang up a bit into booting the guest whenever I spawn a thread 
> that does any sort of read/write on a file descriptor.  My suspicion is 
> that it has something to do with signals being delivered to the wrong 
> thread but after masking out all the signals for this thread, I still 
> had no luck.
>
>   
Maybe you set the mask too late? try setting it before creating the thread:
 sigfillset(&thread_sig_mask);
 sigdelset(&thread_sig_mask,SIGILL);
 sigdelset(&thread_sig_mask,SIGFPE);
 sigdelset(&thread_sig_mask,SIGSEGV);
 pthread_sigmask(SIG_SETMASK, &thread_sig_mask, &curr_sig_mask);
 if ((r = pthread_create(&thread_tid, NULL, thread_func, &init_data))) {
    ....
  }
 pthread_sigmask(SIG_SETMASK, &curr_sig_mask, NULL);
> Any clues to what may be going on?
>
> Regards,
>
> Anthony Liguori
>
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>   


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