[EMAIL PROTECTED] wrote: > Carl J. Van Arsdall wrote: > >> Ah, alright, I think I understand, so threading works well for sharing >> python objects. Would a scenario for this be something like a a job >> queue (say Queue.Queue) for example. This is a situation in which each >> process/thread needs access to the Queue to get the next task it must >> work on. Does that sound right? >> > > That's a reasonable and popular technique. I'm not sure what "this" > refers to in your question, so I can't say if it solves the > problem of which you are thinking. > > >> Would the same apply to multiple >> threads needed access to a dictionary? list? >> > > The Queue class is popular with threads because it already has > locking around its basic methods. You'll need to serialize your > operations when sharing most kinds of objects. > > Yes yes, of course. I was just making sure we are on the same page, and I think I'm finally getting there.
>> Now if you are just passing ints and strings around, use processes with >> some type of IPC, does that sound right as well? >> > > Also reasonable and popular. You can even pass many Python objects > by value using pickle, though you lose some safety. > I actually do use pickle (not for this, but for other things), could you elaborate on the safety issue? > >> Or does the term >> "shared memory" mean something more low-level like some bits that don't >> necessarily mean anything to python but might mean something to your >> application? >> > > Shared memory means the same memory appears in multiple processes, > possibly at different address ranges. What any of them writes to > the memory, they can all read. The standard Python distribution > now offers shared memory via os.mmap(), but lacks cross-process > locks. > > Python doesn't support allocating objects in shared memory, and > doing so would be difficult. That's what the POSH project is > about, but it looks stuck in alpha. > > > -- Carl J. Van Arsdall [EMAIL PROTECTED] Build and Release MontaVista Software -- http://mail.python.org/mailman/listinfo/python-list
