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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 synthetic delay framework makes it possible to dynamically inject | 5 // The synthetic delay framework makes it possible to dynamically inject |
| 6 // arbitrary delays into into different parts of the codebase. This can be used, | 6 // arbitrary delays into into different parts of the codebase. This can be used, |
| 7 // for instance, for testing various task scheduling algorithms. | 7 // for instance, for testing various task scheduling algorithms. |
| 8 // | 8 // |
| 9 // The delays are specified in terms of a target duration for a given block of | 9 // The delays are specified in terms of a target duration for a given block of |
| 10 // code. If the code executes faster than the duration, the thread is made to | 10 // code. If the code executes faster than the duration, the thread is made to |
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| 26 // row, END should be called a corresponding number of times. Only the last | 26 // row, END should be called a corresponding number of times. Only the last |
| 27 // call to END will have an effect. | 27 // call to END will have an effect. |
| 28 // | 28 // |
| 29 // Note that a single delay may begin on one thread and end on another. This | 29 // Note that a single delay may begin on one thread and end on another. This |
| 30 // implies that a single delay cannot not be applied in several threads at once. | 30 // implies that a single delay cannot not be applied in several threads at once. |
| 31 | 31 |
| 32 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_SYNTHETIC_DELAY_H_ | 32 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_SYNTHETIC_DELAY_H_ |
| 33 #define BASE_TRACE_EVENT_TRACE_EVENT_SYNTHETIC_DELAY_H_ | 33 #define BASE_TRACE_EVENT_TRACE_EVENT_SYNTHETIC_DELAY_H_ |
| 34 | 34 |
| 35 #include "base/atomicops.h" | 35 #include "base/atomicops.h" |
| 36 #include "base/macros.h" |
| 36 #include "base/synchronization/lock.h" | 37 #include "base/synchronization/lock.h" |
| 37 #include "base/time/time.h" | 38 #include "base/time/time.h" |
| 38 #include "base/trace_event/trace_event.h" | 39 #include "base/trace_event/trace_event.h" |
| 39 | 40 |
| 40 // Apply a named delay in the current scope. | 41 // Apply a named delay in the current scope. |
| 41 #define TRACE_EVENT_SYNTHETIC_DELAY(name) \ | 42 #define TRACE_EVENT_SYNTHETIC_DELAY(name) \ |
| 42 static base::subtle::AtomicWord INTERNAL_TRACE_EVENT_UID(impl_ptr) = 0; \ | 43 static base::subtle::AtomicWord INTERNAL_TRACE_EVENT_UID(impl_ptr) = 0; \ |
| 43 trace_event_internal::ScopedSyntheticDelay INTERNAL_TRACE_EVENT_UID(delay)( \ | 44 trace_event_internal::ScopedSyntheticDelay INTERNAL_TRACE_EVENT_UID(delay)( \ |
| 44 name, &INTERNAL_TRACE_EVENT_UID(impl_ptr)); | 45 name, &INTERNAL_TRACE_EVENT_UID(impl_ptr)); |
| 45 | 46 |
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| 157 DISALLOW_COPY_AND_ASSIGN(ScopedSyntheticDelay); | 158 DISALLOW_COPY_AND_ASSIGN(ScopedSyntheticDelay); |
| 158 }; | 159 }; |
| 159 | 160 |
| 160 // Helper for registering delays. Do not use directly. | 161 // Helper for registering delays. Do not use directly. |
| 161 TRACE_EVENT_API_CLASS_EXPORT base::trace_event::TraceEventSyntheticDelay* | 162 TRACE_EVENT_API_CLASS_EXPORT base::trace_event::TraceEventSyntheticDelay* |
| 162 GetOrCreateDelay(const char* name, base::subtle::AtomicWord* impl_ptr); | 163 GetOrCreateDelay(const char* name, base::subtle::AtomicWord* impl_ptr); |
| 163 | 164 |
| 164 } // namespace trace_event_internal | 165 } // namespace trace_event_internal |
| 165 | 166 |
| 166 #endif // BASE_TRACE_EVENT_TRACE_EVENT_SYNTHETIC_DELAY_H_ | 167 #endif // BASE_TRACE_EVENT_TRACE_EVENT_SYNTHETIC_DELAY_H_ |
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