Threads (was [OT] - REALBasic Claims 100K Users)
andrew at ugh.eclipse.co.uk
Thu Oct 5 14:46:19 EDT 2006
On 05/10/2006, at 1:40, Dar Scott wrote:
> What kinds of things might be shared among threads?
> Should a thread communicate with any threads other than its parent?
> What kind of communication?
> "Do this and let me know when you are finished."
> "Do this, show progress, and let me know when you are finished."
> Bidirectional message queue.
> Send messages to a thread in 'send' style.
My initial idea would be that when you send a message you could do so
indicating it should be run it it's own thread (or in an existing
thread that you know the name of). By default each object (button,
field, card etc) would have a mutex that you must hold to update it's
attributes or to run any of its handlers (this would be acquired
automatically). It would be possible to do finer grained locking if the
programmer took the trouble to code it. The automatic acquisition of
locks would be dependent on some global property (that might also be
used to permit the creation of threads in the first place) so there
would be no overhead for non-threaded stacks.
There wouldn't need to be any special methods of communication if it
was done this way. A thread would terminate when the original handler
This is just my initial thoughts...there may be flaws I haven't thought
of. There are still details like how to terminate threads on exit, what
do do on deadlock (or if it's the programmers job to avoid it) etc to
More information about the use-livecode