Subj : Does pthread emit a sigchld signal on successful exit?
To   : comp.programming.threads
From : chuckles
Date : Thu Aug 18 2005 03:37 pm

Hullo all, as the subject says Does pthread emit a sigchld signal on
successful exit?
I have an app which starts a thread in response to a button press in a
GUI. I can't join the thread but I need to know when it completes. The
time it takes for the thread to complete is variable and I don't want
to have to poll the thread for completion. I would like to avoid having
to use condition variables, so I thought setting up a signal handler to
catch the SIGCHLD signal would be a neat solution, I've tried using
signal() and sigaction to associate my handler with the SIGCHLD signal
but the handler is never called. When I run the app in gdb, thread exit
messages are printed when ever a thread exits. How does gdb do it? Can
anyone give me a definitive answer to this? It feels like pthread
should be able to do this but I can't find any specific tutorial or
reference which says it does or doesn't. Help!
I'm programming in C++ on RH9 running 2.6.12, gcc3.2.2, I have a C++
object wrapped around a thread (a dirty hack but I needed to make the
C++ and threads splice somehow), I want to avoid excessive coupling in
the program so I don't want to pass the gui object to the C++ thread
wrapper object.
If anyone can give me a clue as to what the problemo is that's be
great. Sorry if this seems like an obvious question, its been driving
me mad.

Chuckles   ;)

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