Subj : Re: Study Material for Multi-threaded application developement in UNIX/LINUX
To   : comp.programming.threads
From : David Schwartz
Date : Thu May 26 2005 09:25 pm


"Arash Partow" <partow@gmail.com> wrote in message 
news:1117153719.637051.87390@g14g2000cwa.googlegroups.com...

> The reason for the loop and such... is because signal and broadcast
> are two different waking mechanisms. In the pthreads standard
> broadcast wakes every waiting thread on the condition where as signal
> wakes the thread that as been waiting the longest or in other words
> was the first to call wait on that condition - aka first in queue.

    Actually, the signal wakes the thread with the highest priority. If 
there is more than one thread at the highest priority, which thread woken is 
unspecified. Optimally, it would be the thread that has waited the *least* 
as that thread is most likely to be hot in the caches.

    DS

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