Subj : Re: pthreads and fork
To   : comp.programming.threads
From : ptjm
Date : Sat Feb 19 2005 10:09 pm

In article <87fyzszl48.fsf@qrnik.zagroda>,
Marcin 'Qrczak' Kowalczyk  <qrczak@knm.org.pl> wrote:
% fork is supposed to leave only the calling thread in the child
% process. What should happen with pthread_t values and the memory
% associated with other threads? Is it legal to call pthread_join
% after fork on a pre-fork thread?
% 
% I imagine one of the following is true:

But none of them are, although 3 is close.

What happens is that all the memory of the caller is copied, the thread
of execution which called fork() continues to run, and only async-signal
safe functions may be called prior to calling exec.

In practice, some people try to mix traditional forked processes with
multi-threading, but it's fiddly and seems a bit pointless.

-- 

Patrick TJ McPhee
North York  Canada
ptjm@interlog.com

.