On Thu, Jun 04, 2009 at 03:57:17PM -0400, Paweł Turek wrote:
> I have a problem 
> write program mask signal SIGUSR1
> do you have any ideas to write this program please help
> 

Something like the following?

{
	sigset_t signals;

	sigemptyset(&signals);
	sigaddset(&signals, SIGUSR1);
	pthread_sigmask(SIG_BLOCK, &signals, NULL);
}