I am interested in the lightest mechanism to use in a Python application for mutex/wait/notify between processes, one of which may be a program which does not have a shared ancestral benefactor, or may not be a Python program at all.
I would ideally like to have something which does not need to make a system call in an uncontended case for the mutex. In C on Linux I would use mmap to get shared memory, then pthread_cond_wait with a cond/mutex which has the PTHREAD_PROCESS_SHARED attribute set. For pthread_cond_wait, it would of course be fine to make a system call. I am familiar with the "multiprocessing" package for the case of a closely related set of Python programs. I am looking for something where the other side is not a Python application using "multiprocessing". A thin layer over pthreads would be nice, or which is using POSIX semaphores/queues would be ok. I can use mmap for shared memory; that is not problem. The synchronization is where I need help. -- http://mail.python.org/mailman/listinfo/python-list
