On Fri, Dec 4, 2009 at 7:42 PM, Jun KAWAI <kwj@vlax.net> wrote:
quoted text
> I see that SIGCHLD which was sent before calling sigaction() for
> SIGCHLD is delivered to the handler when program is linked to
> libpthread.so.  However, this behavior doesn't occur when program
> isn't linked to libpthread.so.
>
> I feel the behavior of SIGCHLD when linked to libpthread.so
> is strange, but I don't know whether the behavior is correct
> or not.

It's a bug, due to how libpthread uses SIGCHLD to detect when a thread
blocked in wait*() should be unblocked.  The fix isn't entirely
trivial and I'm not going to have a chance to look at it closely for
quite a while, so please file a bug with "sendbug" so we don't lose
track of this if I forget about it.


Philip Guenther