ref: 0bb2378d7e2b714998b34394f6977b2ead023d6c
dir: /lib/thread/test/future.myr/
use std use sys use thread use "util" var fut var nready : int32 var ndone : int32 const main = { nready = 0 ndone = 0 fut = thread.mkfut() /* set after we have some waiters */ mkherd(100, getfuture) while nready != 100 /* spin */ ;; std.put("done waiting for ready\n") std.assert(ndone == 0, "thread proceeded too soon\n") thread.futset(&fut, 666) std.assert(thread.futset(&fut, 1) == false, "double set future\n") while ndone != 100 /* spin */ ;; std.put("double set future ok") /* start up a few more to make sure we can still read */ mkherd(50, getfuture) while ndone != 150 /* spin */ ;; /* set ahead of time */ ndone = 0 fut = thread.mkfut() thread.futset(&fut, 666) std.assert(thread.futset(&fut, 666) == false, "double set future\n") mkherd(100, getfuture) while ndone != 100 /* spin */ ;; } const getfuture = { thread.xadd(&nready, 1) std.assert(thread.futget(&fut) == 666, "wrong value gotten from future") thread.xadd(&ndone, 1) }