Subj : sigwaitinfo fails to dequeue signal from a thread
To   : comp.programming.threads
From : krosswindz
Date : Mon Mar 21 2005 08:49 pm

I have signal say SIGRTMIN which I have blocked in all the threads
that I create. I do this by using sigprocmask before I fire my
threads. I have a thread which handles SIGRTMIN without explicitly
using a sigaction. Since I blocked the signal SIGRTMIN, I assume that
it would be in the pending queue for delivery. I use sigwaitinfo to
dequeue the signal in the appropriate thread by looping infinitely. I
find that I am unable to dequeue the signal inside my thread, but I am
able to dequeue the same signal in the main process that fires off all
the threads. Is this the behavior of POSIX threads or my understanding
is correct and this is a bug in the implementation of NPTL or is a bug
in the Linux kernel which causes this to happen.

.