Consumer and Supplier with thread and condition variable in Nim

main.nim

# compile nim c --threads:on --hints:off --run main.nim

import locks, random
from os import sleep

var 
    supplier, consumer: Thread[void]
    repeat = 0
    lock: Lock
    cond: Cond
    value: uint64
    running = true

proc Supplier() {.thread, nimcall.} = 
    randomize()
    var rand = initRand()
    while running:
        lock.acquire()
        value = rand.next
        echo "\t\t\tSupplier: wake up"
        cond.signal()
        inc repeat
        lock.release()
        sleep(500) # give Consumer time to acquire lock (mutex)

proc Consumer() {.thread, nimcall.} = 
    while true:
        lock.acquire()
        if repeat > 10: break
        wait cond, lock
        echo "Consumer: receive ", $value
        lock.release()
    running = false


lock.initLock()
cond.initCond()

createThread(consumer, Consumer)
createThread(supplier, Supplier)

joinThread(consumer)
joinThread(supplier)

echo "Main: exit"

lock.deinitLock()
cond.deinitCond()