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tests/exampleGcFailures/exFailureSeq.nim

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+import std/os
+import std/sequtils
+import chronos
+import chronos/threadsync
+import chronos/unittest2/asynctests
+import taskpools
+
+type
+  Seq*[T] = object
+    data*: ptr UncheckedArray[T]
+    size*: int
+
+
+template toOpenArray*[T](arr: Seq[T]): auto =
+  system.toOpenArray(arr.data, 0, arr.size)
+
+proc toArrayHolder*[T](data: seq[T]): Seq[T] =
+    Seq[T](
+      data: cast[ptr UncheckedArray[T]](unsafeAddr(data[0])), size: data.len()
+    )
+
+proc worker(data: Seq[char], sig: ThreadSignalPtr) =
+  os.sleep(100)
+  echo "running worker: "
+  echo "worker: ", data.toOpenArray()
+  for i, c in data.toOpenArray():
+    data.data[i] = char(c.uint8 + 10)
+  discard sig.fireSync()
+
+proc runTest(tp: TaskPool, sig: ThreadSignalPtr) {.async.} =
+  ## init
+  var obj = "hello world!".toSeq()
+
+  echo "spawn worker"
+  tp.spawn worker(obj.toArrayHolder(), sig)
+
+  ## adding fut.wait(100.milliseconds) creates memory issue
+  await wait(sig).wait(10.milliseconds)
+  ## just doing the wait is fine:
+  # await wait(sig)
+
+proc runTests(tp: TaskPool, sig: ThreadSignalPtr) {.async.} =
+  for i in 1..10_000:
+    try:
+      await runTest(tp, sig)
+      os.sleep(200)
+    except AsyncTimeoutError:
+      echo "looping..."
+      GC_fullCollect()
+
+suite "async tests":
+  var tp = Taskpool.new(num_threads = 2) # Default to the number of hardware threads.
+  let sig = ThreadSignalPtr.new().get()
+
+  asyncTest "test":
+    await runTests(tp, sig)