Subj : Re: NPTL and sigwait() problem under linux
To   : comp.programming.threads
From : loic-dev
Date : Wed Aug 17 2005 02:33 am

Salut Daniele,

> > Stopping right here (being lazy):

[snip]

> > So try pthread_sigmask instead.
> >
> You've stopped reading too early, I've already tried :-/

John is right, you should use pthread_sigmask() in multi-threaded
process (as a matter of fact, on Linux sigprocmask() works exactly as
pthread_sigmask() for MT process. But that's not a portable behavior,
if portability is a concern).


> Maybe it's a problem with my own system, I'm using libc6 (glibc) version
> 2.3.2, with linux kernel 2.6.11.7 and 2.6.5, using nptl.
> Running the program with LinuxThreads, typing
>
> # LD_ASSUME_KERNEL=2.4.21 ./myprogram
>
> works perfectly (but, of course, LinuxThreads is not fully standard
> compliant).

I can't see any problem with your code. I've tried it on my NPTL system
(FC3), it behaves as expected (e.g. react upon Ctrl-C).

I am suspecting an issue with your NPTL. Could you try if the slighty
changed version of your program reacts accordingly upon Ctrl-C for
instance? Could you send us the trace:

bash$ strace -f test_prg

Thanks,
Loic.


/* same as your snippet */
....
int main(void)
{
     signal_init();
     while (!terminate);
     signal_finish();
     return 0;
}

.