Example solution for C++ 101 Exercise 3 (message loops)

base/cpp101/sleep.cc

Index: base/cpp101/sleep.cc
diff --git a/base/cpp101/sleep.cc b/base/cpp101/sleep.cc
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+++ b/base/cpp101/sleep.cc
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stdio.h>
+
+#include "base/at_exit.h"
+#include "base/location.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/time/time.h"
+
+int main(int argc, char* argv[]) {
+  base::AtExitManager exit_manager;
+
+  if (argc <= 1) {
+    printf("%s: missing operand\n", argv[0]);
+    return -1;
+  }
+
+  int duration_seconds = 0;
+  if (!base::StringToInt(argv[1], &duration_seconds) ||
+      duration_seconds < 0) {
+    printf("%s: invalid time interval `%s'\n", argv[0], argv[1]);
+    return -1;
+  }
+
+  base::TimeDelta duration = base::TimeDelta::FromSeconds(duration_seconds);
+
+  base::MessageLoop main_loop;
+
+  base::RunLoop run_loop;
+
+  main_loop.PostDelayedTask(FROM_HERE, run_loop.QuitClosure(), duration);
+
+  run_loop.Run();
+
+  return 0;
+}