Move some misc thread-related stuff from base to base/thread and into the bas...

base/threading/watchdog_unittest.cc

+// Copyright (c) 2010 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 "base/threading/watchdog.h"
+
+#include "base/logging.h"
+#include "base/platform_thread.h"
+#include "base/spin_wait.h"
+#include "base/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+
+namespace {
+
+//------------------------------------------------------------------------------
+// Provide a derived class to facilitate testing.
+
+class WatchdogCounter : public Watchdog {
+ public:
+  WatchdogCounter(const TimeDelta& duration,
+                  const std::string& thread_watched_name,
+                  bool enabled)
+      : Watchdog(duration, thread_watched_name, enabled), alarm_counter_(0) {
+  }
+
+  virtual ~WatchdogCounter() {}
+
+  virtual void Alarm() {
+    alarm_counter_++;
+    Watchdog::Alarm();
+  }
+
+  int alarm_counter() { return alarm_counter_; }
+
+ private:
+  int alarm_counter_;
+
+  DISALLOW_COPY_AND_ASSIGN(WatchdogCounter);
+};
+
+class WatchdogTest : public testing::Test {
+ public:
+  void SetUp() {
+    Watchdog::ResetStaticData();
+  }
+};
+
+}  // namespace
+
+//------------------------------------------------------------------------------
+// Actual tests
+
+// Minimal constructor/destructor test.
+TEST_F(WatchdogTest, StartupShutdownTest) {
+  Watchdog watchdog1(TimeDelta::FromMilliseconds(300), "Disabled", false);
+  Watchdog watchdog2(TimeDelta::FromMilliseconds(300), "Enabled", true);
+}
+
+// Test ability to call Arm and Disarm repeatedly.
+TEST_F(WatchdogTest, ArmDisarmTest) {
+  Watchdog watchdog1(TimeDelta::FromMilliseconds(300), "Disabled", false);
+  watchdog1.Arm();
+  watchdog1.Disarm();
+  watchdog1.Arm();
+  watchdog1.Disarm();
+
+  Watchdog watchdog2(TimeDelta::FromMilliseconds(300), "Enabled", true);
+  watchdog2.Arm();
+  watchdog2.Disarm();
+  watchdog2.Arm();
+  watchdog2.Disarm();
+}
+
+// Make sure a basic alarm fires when the time has expired.
+TEST_F(WatchdogTest, AlarmTest) {
+  WatchdogCounter watchdog(TimeDelta::FromMilliseconds(10), "Enabled", true);
+  watchdog.Arm();
+  SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromMinutes(5),
+                                   watchdog.alarm_counter() > 0);
+  EXPECT_EQ(1, watchdog.alarm_counter());
+}
+
+// Make sure a basic alarm fires when the time has expired.
+TEST_F(WatchdogTest, AlarmPriorTimeTest) {
+  WatchdogCounter watchdog(TimeDelta(), "Enabled2", true);
+  // Set a time in the past.
+  watchdog.ArmSomeTimeDeltaAgo(TimeDelta::FromSeconds(2));
+  // It should instantly go off, but certainly in less than 5 minutes.
+  SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromMinutes(5),
+                                   watchdog.alarm_counter() > 0);
+
+  EXPECT_EQ(1, watchdog.alarm_counter());
+}
+
+// Make sure a disable alarm does nothing, even if we arm it.
+TEST_F(WatchdogTest, ConstructorDisabledTest) {
+  WatchdogCounter watchdog(TimeDelta::FromMilliseconds(10), "Disabled", false);
+  watchdog.Arm();
+  // Alarm should not fire, as it was disabled.
+  PlatformThread::Sleep(500);
+  EXPECT_EQ(0, watchdog.alarm_counter());
+}
+
+// Make sure Disarming will prevent firing, even after Arming.
+TEST_F(WatchdogTest, DisarmTest) {
+  WatchdogCounter watchdog(TimeDelta::FromSeconds(1), "Enabled3", true);
+
+  TimeTicks start = TimeTicks::Now();
+  watchdog.Arm();
+  PlatformThread::Sleep(100);  // Sleep a bit, but not past the alarm point.
+  watchdog.Disarm();
+  TimeTicks end = TimeTicks::Now();
+
+  if (end - start > TimeDelta::FromMilliseconds(500)) {
+    LOG(WARNING) << "100ms sleep took over 500ms, making the results of this "
+                 << "timing-sensitive test suspicious.  Aborting now.";
+    return;
+  }
+
+  // Alarm should not have fired before it was disarmed.
+  EXPECT_EQ(0, watchdog.alarm_counter());
+
+  // Sleep past the point where it would have fired if it wasn't disarmed,
+  // and verify that it didn't fire.
+  PlatformThread::Sleep(1000);
+  EXPECT_EQ(0, watchdog.alarm_counter());
+
+  // ...but even after disarming, we can still use the alarm...
+  // Set a time greater than the timeout into the past.
+  watchdog.ArmSomeTimeDeltaAgo(TimeDelta::FromSeconds(10));
+  // It should almost instantly go off, but certainly in less than 5 minutes.
+  SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromMinutes(5),
+                                   watchdog.alarm_counter() > 0);
+
+  EXPECT_EQ(1, watchdog.alarm_counter());
+}
+
+}  // namespace base