On Wed, Aug 13, 2025 at 11:29 AM Thomas Munro <thomas.mu...@gmail.com> wrote: > FWIW in early prototype multithreading patches you can just use > sem_init() on all these systems since you don't need pshared=1.
Oops, I misremembered that. It works on NetBSD and OpenBSD, but not macOS :-(. Hmm, but it looks like there has been a new development in macOS 15. They have finally made the futex API public: https://developer.apple.com/documentation/os/os_sync_wait_on_address That was one of the sticking points for my patch that added our own replacement sem_init() implementation. At the time the only "proper" way to reach the undocumented and undeclared __ulock_wait()/__ulock_wake() functions was to write a module in C++ using std::atomic<int>::wait()/notify(), which I had started to wonder about, but here it is with a shiny new C interface and documentation. Maybe I should have another go at that!
