Subj : Re: pthread_sigmask in single thread application
To   : comp.programming.threads
From : David Schwartz
Date : Tue Jan 04 2005 12:25 am


"Harshana" <harshana@sumuthu.lk> wrote in message 
news:1104824136.945613.73110@f14g2000cwb.googlegroups.com...
> Hi all,
>
> I have a single thread, socket based program that need to handle
> SIG_CHILD when any of its child processes exits. But signals should
> come only when its in select() loop. So I use pthread_sigmask() BLOCK
> and UNBLOCK to prevent SIG_CHLD from coming while working outside of
> select(). But recently I have noticed that signals doesn't get blocked
> with pthread_sigmask(BLOCK). I have seen this kind of behaviour when
> linked without -lpthread. But now irrespective of linking -lpthread
> library, sigmask() doesn't work. Anyone has any idea why its happening
> like this? Can anyone suggest me a solution?

    My advice to you is to accept the signal at any time. Just have the 
signal handler set a flag. Then, before/after you call 'select', just check 
if the flag is set, and if it is, do your reaping.

    DS

.