POSIX Message Queue Sucks

mq_open sucks on Linux. By the POSIX standard, it probably sucks everywhere.

To create an anonymous message queue, you have to do mq_open(name, O_CREAT|O_EXCL|O_RDWR, _, _) followed by mq_unlink(name). The operation (2 syscalls) is atomic, but

• message queue leaks if the program stops in between the two calls. there’s no safe way to delete those message queues without stopping the world.
• if mq_open fails, you have to pick another name.

I guess I’ll stick to futex-based message queue implementations. Notable mentions are Zig’s std queue and libzmq.

Better yet, I will not write threaded programs if I don’t have to.