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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 // This file provides a macro ONLY for use in testing. | 5 // This file provides a macro ONLY for use in testing. |
6 // DO NOT USE IN PRODUCTION CODE. There are much better ways to wait. | 6 // DO NOT USE IN PRODUCTION CODE. There are much better ways to wait. |
7 | 7 |
8 // This code is very helpful in testing multi-threaded code, without depending | 8 // This code is very helpful in testing multi-threaded code, without depending |
9 // on almost any primitives. This is especially helpful if you are testing | 9 // on almost any primitives. This is especially helpful if you are testing |
10 // those primitive multi-threaded constructs. | 10 // those primitive multi-threaded constructs. |
11 | 11 |
12 // We provide a simple one argument spin wait (for 1 second), and a generic | 12 // We provide a simple one argument spin wait (for 1 second), and a generic |
13 // spin wait (for longer periods of time). | 13 // spin wait (for longer periods of time). |
14 | 14 |
15 #ifndef BASE_SYNCHRONIZATION_SPIN_WAIT_H_ | 15 #ifndef BASE_SYNCHRONIZATION_SPIN_WAIT_H_ |
16 #define BASE_SYNCHRONIZATION_SPIN_WAIT_H_ | 16 #define BASE_SYNCHRONIZATION_SPIN_WAIT_H_ |
17 | 17 |
18 #include "base/threading/platform_thread.h" | 18 #include "base/threading/platform_thread.h" |
19 #include "base/time.h" | 19 #include "base/time/time.h" |
20 | 20 |
21 // Provide a macro that will wait no longer than 1 second for an asynchronous | 21 // Provide a macro that will wait no longer than 1 second for an asynchronous |
22 // change is the value of an expression. | 22 // change is the value of an expression. |
23 // A typical use would be: | 23 // A typical use would be: |
24 // | 24 // |
25 // SPIN_FOR_1_SECOND_OR_UNTIL_TRUE(0 == f(x)); | 25 // SPIN_FOR_1_SECOND_OR_UNTIL_TRUE(0 == f(x)); |
26 // | 26 // |
27 // The expression will be evaluated repeatedly until it is true, or until | 27 // The expression will be evaluated repeatedly until it is true, or until |
28 // the time (1 second) expires. | 28 // the time (1 second) expires. |
29 // Since tests generally have a 5 second watch dog timer, this spin loop is | 29 // Since tests generally have a 5 second watch dog timer, this spin loop is |
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41 if (kTimeout < base::TimeTicks::Now() - start) { \ | 41 if (kTimeout < base::TimeTicks::Now() - start) { \ |
42 EXPECT_LE((base::TimeTicks::Now() - start).InMilliseconds(), \ | 42 EXPECT_LE((base::TimeTicks::Now() - start).InMilliseconds(), \ |
43 kTimeout.InMilliseconds()) << "Timed out"; \ | 43 kTimeout.InMilliseconds()) << "Timed out"; \ |
44 break; \ | 44 break; \ |
45 } \ | 45 } \ |
46 base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(50)); \ | 46 base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(50)); \ |
47 } \ | 47 } \ |
48 } while (0) | 48 } while (0) |
49 | 49 |
50 #endif // BASE_SYNCHRONIZATION_SPIN_WAIT_H_ | 50 #endif // BASE_SYNCHRONIZATION_SPIN_WAIT_H_ |
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