Subj : Re: pthread priority in Linux 2.4 Kernel
To   : comp.programming.threads
From : David Schwartz
Date : Tue Aug 02 2005 12:35 pm


"forSale" <@hotmail.com> wrote in message 
news:G7qdnURgOZzhEXLfRVn-ug@magma.ca...

> Now Since thread 2 has higher priority than thread1. Thread1 should never
> get executed once thread2 start to run.  Why is the thread1 getting
> executing again.

    Your assumption is definitely wrong. Just because one thread has higher 
priority than another, it doesn't mean the other thread won't run! It just 
means that if the system ever has to choose which of the two threads to run, 
it will choose the higher priority one. But maybe it doesn't have to choose 
because it has two virtual CPUs. Or maybe the higher priority thread is 
blocked trying to output data to a full buffer.

    DS

.