On Sat, Oct 26, 2002 at 04:24:57PM +1300, Feng Lu wrote:

 > I am using mutex for inter process locking. In the following code, I
 > expect that when a process is runing, its another instance should wait
 > until the previous instance completes. However, this does not work. why?

pthread mutexes only work in a single process, between two or more threads
within that process.  You cannot expect them to work between different
processes.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>