On Tue, Jun 07, 2005 at 01:23:54PM +0200, Johannes Stezenbach wrote:
> On Tue, Jun 07, 2005 at 12:36:48PM +0200, Dr. Werner Fink wrote:
> > On Tue, Jun 07, 2005 at 11:24:36AM +0200, Johannes Stezenbach wrote:
> > >
> > > vdr sets a watchdog with alarm(). Signals could also come
> > > from the kernel (SIGIO, SIGCHLD etc.). (I thought vdr uses
> > > signals internally, but this doesn't seem to be true anymore).
> >
> > Don't forget the realtime thread handling which uses
> > signals in some implementations.
>
> I think linux_threads doesn't interrupt blocking syscalls
> with signals unless you use pthread_cancel().
Yep:
vdr/Devel> grep pthread_cancel vdr-1.3.25/ -r
vdr-1.3.25/thread.c: pthread_cancel(childTid);
beside this the Makefile uses -D_GNU_SOURCE which force
the automatic restart after the syscall was signaled
during its operation.
>
> NPTL doesn't use signals to wake up sleeping threads at all.
The original VDR 1.2.6 uses SIGIO for waking up threads.
Werner
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