Subj : Memory synchronization with pthreads
To   : comp.programming.threads
From : Chris Vine
Date : Sun Jan 16 2005 07:51 pm

Section 4.10 of IEEE Std 1003.1-2001 provides that a number of specified
functions, such as pthread_mutex_lock(), pthread_mutex_trylock(),
pthread_mutex_unlock(), sem_post() and sem_wait() "synchronize memory with
respect to other threads".

For a process with multiple threads does this imply that a call in a thread
which, say, locks or unlocks a mutex will synchronise memory with respect
to only the other threads in the process holding (or trying to hold) a lock
on the mutex, or does it require all threads in the process to have memory
synchronized, whether or not they are waiting on the mutex and indeed
whether or not they have access to the mutex?

Chris

-- 
To reply by e-mail, remove the "--nospam--" in the address

.