September 2017 Update

Task/Synchronous-concurrency/Nim/synchronous-concurrency.nim

@@ -0,0 +1,33 @@
+var msgs: Channel[string]
+var count: Channel[int]
+
+const FILE = "input.txt"
+
+proc read() {.thread.} =
+  var file = open(FILE)
+  for line in file.lines:
+    msgs.send(line)
+  msgs.send(nil)
+  file.close()
+  echo count.recv()
+  count.close()
+
+proc print() {.thread.} =
+  var n = 0
+  while true:
+    var msg = msgs.recv()
+    if msg == nil:
+      break
+    echo msg
+    n += 1
+  msgs.close()
+  count.send(n)
+
+var reader_thread = Thread[void]()
+var printer_thread = Thread[void]()
+
+msgs.open()
+count.open()
+createThread(reader_thread, read)
+createThread(printer_thread, print)
+joinThreads(reader_thread, printer_thread)