Re: A thread object -- GtkThread

[Gustavo Joćo Alves Marques Carneiro <ee96090 fe up pt>]

On Thu, 17 Feb 2000, Steven Hanley wrote:

> Gustavo Joćo Alves Marques Carneiro wrote:
> 
> >     The question is: is there a better way to do this? Specifically, I
> > don't know of any function from the pthread library to check if a thread
> > has terminated -- I'm using a flag and the timeout function. I don't like
> > this very much, but it's the best I could do.
> 
> yes there is a way to see if a thread has terminated, the pthread_join
> function, it works like waitpid in normal unix programming.
> 
> however as there is no parent/child relationship in the threads as such
> it allows any thread to wait on any other thread. more than one thread
> calling pthread_join is undefined.
> 
> it is int pthread_join (pthread_t tid, void **status);
> 
> status can be null, tid is the thread you want to wait on (this is a
> blocking call)

  That is the problem with pthread_join: it is a blocking call. I think
you misunderstood me. I don't want to find out if the thread has
terminated *abnormally*, I want to find out if it has finished (normally
or not) without waiting for it, just like waitpid allows one to do, with
the WNOHANG option.

> 
> if status is not null, *status will contain the return value, you can
> check this against PTHREAD_CANCELLED to see if it was stopped
> abnormally, otherwise *status of course contains the return value of the
> thread function.
> 
> 	See You
> 	    Steve
> 
> 

-- 
Gustavo J.A.M. Carneiro
[reinolinux.fe.up.pt/~ee96090]