My only problem is MacOS with its too small default SHM buffers, you need to enhance them. Most solutions need a reboot, but a simple setter is enough. Like sudo sysctl -w kern.sysv.shmmax=16777216
https://github.com/Flow-IPC/ipc/issues/101 (<= https://github.com/orgs/Flow-IPC/discussions/98)
For macOS/ARM64, currently it looks to me like the apparent lack of /dev/shm equivalent (unless I messed up in searching for it) means the most significant amount of new work necessary to port it ... but you just mentioned a thing I did not know about. (SHM size/count limits definitely were a thing in Linux, though, indeed.) TY
Never use /dev/shm directly unless Linux only.
You can literally do everything with mmap that you can do with shm, without hitting OS caps, no performance penalty and with a code that's simpler.
I imagine on macos you'd have to use the mach APIs if you're avoiding shm.