(Many, many years ago I was working on the Zeus web server, and we went to surprising lengths to avoid syscalls for performance.)
Snap!
IIRC, ZWS used shared memory to mirror the results of the time() syscall across processes, to save a few nanoseconds on some operating systems :) That was before Linux and other OSs used techniques like the vsyscall/VDSO mentioned in the stackoverflow discussion...
Snap!
IIRC, ZWS used shared memory to mirror the results of the time() syscall across processes, to save a few nanoseconds on some operating systems :) That was before Linux and other OSs used techniques like the vsyscall/VDSO mentioned in the stackoverflow discussion...