Initial release.

test/go/fifo.js

@@ -0,0 +1,61 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test that unbuffered channels act as pure fifos.
+
+'use strict'
+
+const Channel = require('../../lib')
+
+it(`fifo`, function () {
+  const N = 10
+
+  const AsynchFifo = async () => {
+    const ch = Channel(10)
+
+    for (let i = 0; i < N; i++) {
+      await ch.push(i)
+    }
+
+    for (let i = 0; i < N; i++) {
+      if (await ch.shift() !== i) {
+        throw new Error(`bad receive`)
+      }
+    }
+  }
+
+  const Chain = async (ch, val, input, output) => {
+    await input.shift()
+
+    if (await ch.shift() !== val) {
+      throw new Error(val)
+    }
+
+    await output.push(1)
+  }
+
+  // thread together a daisy chain to read the elements in sequence
+  const SynchFifo = async () => {
+    const ch = Channel()
+    let input = Channel()
+    let start = input
+
+    for (let i = 0; i < N; i++) {
+      const output = Channel()
+      Chain(ch, i, input, output)
+      input = output
+    }
+
+    await start.push(0)
+
+    for (let i = 0; i < N; i++) {
+      await ch.push(i)
+    }
+
+    await input.shift()
+  }
+
+  AsynchFifo()
+  SynchFifo()
+})