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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // The Watchdog class creates a second thread that can Alarm if a specific | 5 // The Watchdog class creates a second thread that can Alarm if a specific |
6 // duration of time passes without proper attention. The duration of time is | 6 // duration of time passes without proper attention. The duration of time is |
7 // specified at construction time. The Watchdog may be used many times by | 7 // specified at construction time. The Watchdog may be used many times by |
8 // simply calling Arm() (to start timing) and Disarm() (to reset the timer). | 8 // simply calling Arm() (to start timing) and Disarm() (to reset the timer). |
9 // The Watchdog is typically used under a debugger, where the stack traces on | 9 // The Watchdog is typically used under a debugger, where the stack traces on |
10 // other threads can be examined if/when the Watchdog alarms. | 10 // other threads can be examined if/when the Watchdog alarms. |
11 | 11 |
12 // Some watchdogs will be enabled or disabled via command line switches. To | 12 // Some watchdogs will be enabled or disabled via command line switches. To |
13 // facilitate such code, an "enabled" argument for the constuctor can be used | 13 // facilitate such code, an "enabled" argument for the constuctor can be used |
14 // to permanently disable the watchdog. Disabled watchdogs don't even spawn | 14 // to permanently disable the watchdog. Disabled watchdogs don't even spawn |
15 // a second thread, and their methods call (Arm() and Disarm()) return very | 15 // a second thread, and their methods call (Arm() and Disarm()) return very |
16 // quickly. | 16 // quickly. |
17 | 17 |
18 #ifndef BASE_THREADING_WATCHDOG_H_ | 18 #ifndef BASE_THREADING_WATCHDOG_H_ |
19 #define BASE_THREADING_WATCHDOG_H_ | 19 #define BASE_THREADING_WATCHDOG_H_ |
20 | 20 |
21 #include <string> | 21 #include <string> |
22 | 22 |
23 #include "base/base_export.h" | 23 #include "base/base_export.h" |
24 #include "base/compiler_specific.h" | 24 #include "base/compiler_specific.h" |
| 25 #include "base/macros.h" |
25 #include "base/synchronization/condition_variable.h" | 26 #include "base/synchronization/condition_variable.h" |
26 #include "base/synchronization/lock.h" | 27 #include "base/synchronization/lock.h" |
27 #include "base/threading/platform_thread.h" | 28 #include "base/threading/platform_thread.h" |
28 #include "base/time/time.h" | 29 #include "base/time/time.h" |
29 | 30 |
30 namespace base { | 31 namespace base { |
31 | 32 |
32 class BASE_EXPORT Watchdog { | 33 class BASE_EXPORT Watchdog { |
33 public: | 34 public: |
34 // Constructor specifies how long the Watchdog will wait before alarming. | 35 // Constructor specifies how long the Watchdog will wait before alarming. |
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86 ThreadDelegate delegate_; // Store it, because it must outlive the thread. | 87 ThreadDelegate delegate_; // Store it, because it must outlive the thread. |
87 | 88 |
88 TimeTicks start_time_; // Start of epoch, and alarm after duration_. | 89 TimeTicks start_time_; // Start of epoch, and alarm after duration_. |
89 | 90 |
90 DISALLOW_COPY_AND_ASSIGN(Watchdog); | 91 DISALLOW_COPY_AND_ASSIGN(Watchdog); |
91 }; | 92 }; |
92 | 93 |
93 } // namespace base | 94 } // namespace base |
94 | 95 |
95 #endif // BASE_THREADING_WATCHDOG_H_ | 96 #endif // BASE_THREADING_WATCHDOG_H_ |
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