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Side by Side Diff: base/synchronization/spin_wait.h

Issue 18119002: Use a direct include of time headers in base/, part 2. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: win fix Created 7 years, 5 months ago
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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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