[comp.unix.wizards] how will BSD semaphores work withough atomic test-and-set?

gamiddle@maytag.waterloo.edu (Guy Middleton) (07/11/90)

I remember hearing about Berkeley's new semaphore scheme, which depends upon
shared memory, and using an atomic test-and-set instruction to avoid making
syscalls.  Does anybody know how (or if) this will be modified to work on
machines without such instructions?