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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 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 #include "base/logging_win.h" | 5 #include "base/logging_win.h" |
| 6 #include "base/atomicops.h" | 6 #include "base/atomicops.h" |
| 7 #include "base/singleton.h" | 7 #include "base/singleton.h" |
| 8 #include <initguid.h> // NOLINT | 8 #include <initguid.h> // NOLINT |
| 9 | 9 |
| 10 namespace { | 10 namespace { |
| 11 | 11 |
| 12 struct LogEventProviderTraits { | 12 struct LogEventProviderTraits { |
| 13 // WARNING: User has to deal with get() returning NULL. | 13 // WARNING: User has to deal with get() returning NULL. |
| 14 static logging::LogEventProvider* New() { | 14 static logging::LogEventProvider* New() { |
| 15 if (base::subtle::NoBarrier_AtomicExchange(&dead_, 1)) | 15 if (base::subtle::NoBarrier_AtomicExchange(&dead_, 1)) |
| 16 return NULL; | 16 return NULL; |
| 17 logging::LogEventProvider* ptr = | 17 logging::LogEventProvider* ptr = |
| 18 reinterpret_cast<logging::LogEventProvider*>(buffer_); | 18 reinterpret_cast<logging::LogEventProvider*>(buffer_); |
| 19 // We are protected by a memory barrier. | 19 // We are protected by a memory barrier. |
| 20 new(ptr) logging::LogEventProvider(); | 20 new (ptr) logging::LogEventProvider(); |
| 21 return ptr; | 21 return ptr; |
| 22 } | 22 } |
| 23 | 23 |
| 24 static void Delete(logging::LogEventProvider* p) { | 24 static void Delete(logging::LogEventProvider* p) { |
| 25 base::subtle::NoBarrier_Store(&dead_, 1); | 25 base::subtle::NoBarrier_Store(&dead_, 1); |
| 26 MemoryBarrier(); | 26 MemoryBarrier(); |
| 27 p->logging::LogEventProvider::~LogEventProvider(); | 27 p->logging::LogEventProvider::~LogEventProvider(); |
| 28 } | 28 } |
| 29 | 29 |
| 30 static const bool kRegisterAtExit = true; | 30 static const bool kRegisterAtExit = true; |
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| 143 break; | 143 break; |
| 144 } | 144 } |
| 145 } | 145 } |
| 146 | 146 |
| 147 void LogEventProvider::OnEventsDisabled() { | 147 void LogEventProvider::OnEventsDisabled() { |
| 148 // Restore the old log level. | 148 // Restore the old log level. |
| 149 SetMinLogLevel(old_log_level_); | 149 SetMinLogLevel(old_log_level_); |
| 150 } | 150 } |
| 151 | 151 |
| 152 } // namespace logging | 152 } // namespace logging |
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