shithub: mc

ref: 63f4ce6387dea9f943ecc9c9f9b7af147560839d
dir: /lib/thread/test/condvar.myr/

use std
use thread

use thrtestutil

const Nwakes = 1000

var cv
var cv1
var mtx
var val

var ready
var nwoken : int32

const main = {
	ready = thread.mkwg(2)
	val = 123

	mtx = thread.mkmtx()
	cv = thread.mkcond(&mtx)
	cv1 = thread.mkcond(&mtx)
	thread.spawn(cvwait)
	thread.spawn(cvwake)
	thread.wgwait(&ready)
	std.assert(nwoken == Nwakes, "wrong number of wakes")

	ready = thread.mkwg(100)
	nwoken = 0
	thrtestutil.mkherd(100, cvwaitonce)

	thread.wgwait(&ready)
	while nwoken != 100
		thread.condbroadcast(&cv)
	;;
}

const cvwait = {
	for var i = 0; i < Nwakes; i++
		thread.mtxlock(&mtx)
		thread.condsignal(&cv1)
		thread.condwait(&cv)
		std.assert(val == 456, "wrong val after signal\n")
		val = 123
		thread.mtxunlock(&mtx)

		thread.xadd(&nwoken, 1)
	;;
	thread.condsignal(&cv1)
	thread.wgpost(&ready)
}

const cvwake = {
	while true
		thread.mtxlock(&mtx)
		val = 456
		thread.condsignal(&cv)
		thread.condwait(&cv1)
		thread.mtxunlock(&mtx)

		if nwoken >= Nwakes
			break
		;;
	;;
	thread.wgpost(&ready)
}

const cvwaitonce = {
	thread.mtxlock(&mtx)
	thread.wgpost(&ready)
	thread.condwait(&cv)
	thread.mtxunlock(&mtx)

	thread.xadd(&nwoken, 1)
}