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discard """
cmd: "nim $target --threads:on $options $file"
action: "compile"
"""
import std / [os, locks, atomics, isolation]
type
MyList {.acyclic.} = ref object
data: string
next: Isolated[MyList]
template withMyLock*(a: Lock, body: untyped) =
acquire(a)
{.gcsafe.}:
try:
body
finally:
release(a)
var head: Isolated[MyList]
var headL: Lock
var shouldStop: Atomic[bool]
initLock headL
proc send(x: sink string) =
withMyLock headL:
head = isolate MyList(data: x, next: move head)
proc worker() {.thread.} =
var workItem = MyList(nil)
var echoed = 0
while true:
withMyLock headL:
var h = extract head
if h != nil:
workItem = h
# workitem is now isolated:
head = move h.next
else:
workItem = nil
# workItem is isolated, so we can access it outside
# the lock:
if workItem.isNil:
if shouldStop.load:
break
else:
# give producer time to breath:
os.sleep 30
else:
if echoed < 100:
echo workItem.data
inc echoed
var thr: Thread[void]
createThread(thr, worker)
send "abc"
send "def"
for i in 0 ..< 10_000:
send "xzy"
send "zzz"
shouldStop.store true
joinThread(thr)
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