Thanks. I’ve used FFI before, and have several references to shared memory on the Mac (other OS’s have similar facilities). The real question is about setting a pointer to the memory used by a Bitmap object.

Getting FFI to work with the latest version of Mac OS X is often quite painful due to all the security-related hoops you must jump through to give  permission to an app to access libraries outside the app’s own set. I *think* that Apple’s built in shared memory API won’t be as covoluted to use via FFI as other libraries are, but haven’t tested it on Mac OS X 13.x (Ventura).

The real question is about setting the pointer that a Bitmap (in two or more images) uses. ELiot kindly offered to mentor me through the process of writing plugins. The real question is: am I up for that?

L

> 
> 
> Hi --
> 
> I would use SqueakFFI and through that interface a system library for memory shared between processes. Maybe through memory-mapped files or similar...
> 
> [URLS deleted to satisfy my malfunctioning ISP mailing system]
> 
> Once you have your ExternalAddress for that shared memory region, you can start reading and writing bytes from multiple Squeak images. Watch out for synchronization/locking etc.
> 
> Best,
> Marcel

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