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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 #include "content/renderer/gamepad_shared_memory_reader.h" | 5 #include "content/renderer/gamepad_shared_memory_reader.h" |
| 6 | 6 |
| 7 #include "base/metrics/histogram_macros.h" | 7 #include "base/metrics/histogram_macros.h" |
| 8 #include "base/trace_event/trace_event.h" | 8 #include "base/trace_event/trace_event.h" |
| 9 #include "content/common/gamepad_hardware_buffer.h" | |
| 10 #include "content/public/renderer/render_thread.h" | 9 #include "content/public/renderer/render_thread.h" |
| 11 #include "content/renderer/renderer_blink_platform_impl.h" | 10 #include "content/renderer/renderer_blink_platform_impl.h" |
| 12 #include "ipc/ipc_sync_message_filter.h" | 11 #include "ipc/ipc_sync_message_filter.h" |
| 13 #include "services/service_manager/public/cpp/interface_provider.h" | 12 #include "services/service_manager/public/cpp/interface_provider.h" |
| 14 #include "third_party/WebKit/public/platform/WebGamepadListener.h" | 13 #include "third_party/WebKit/public/platform/WebGamepadListener.h" |
| 15 #include "third_party/WebKit/public/platform/WebPlatformEventListener.h" | 14 #include "third_party/WebKit/public/platform/WebPlatformEventListener.h" |
| 16 | 15 |
| 17 namespace content { | 16 namespace content { |
| 18 | 17 |
| 19 GamepadSharedMemoryReader::GamepadSharedMemoryReader(RenderThread* thread) | 18 GamepadSharedMemoryReader::GamepadSharedMemoryReader(RenderThread* thread) |
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| 85 return; | 84 return; |
| 86 | 85 |
| 87 // Only try to read this many times before failing to avoid waiting here | 86 // Only try to read this many times before failing to avoid waiting here |
| 88 // very long in case of contention with the writer. TODO(scottmg) Tune this | 87 // very long in case of contention with the writer. TODO(scottmg) Tune this |
| 89 // number (as low as 1?) if histogram shows distribution as mostly | 88 // number (as low as 1?) if histogram shows distribution as mostly |
| 90 // 0-and-maximum. | 89 // 0-and-maximum. |
| 91 const int kMaximumContentionCount = 10; | 90 const int kMaximumContentionCount = 10; |
| 92 int contention_count = -1; | 91 int contention_count = -1; |
| 93 base::subtle::Atomic32 version; | 92 base::subtle::Atomic32 version; |
| 94 do { | 93 do { |
| 95 version = gamepad_hardware_buffer_->sequence.ReadBegin(); | 94 version = gamepad_hardware_buffer_->seqlock.ReadBegin(); |
| 96 memcpy(&read_into, &gamepad_hardware_buffer_->buffer, sizeof(read_into)); | 95 memcpy(&read_into, &gamepad_hardware_buffer_->data, sizeof(read_into)); |
| 97 ++contention_count; | 96 ++contention_count; |
| 98 if (contention_count == kMaximumContentionCount) | 97 if (contention_count == kMaximumContentionCount) |
| 99 break; | 98 break; |
| 100 } while (gamepad_hardware_buffer_->sequence.ReadRetry(version)); | 99 } while (gamepad_hardware_buffer_->seqlock.ReadRetry(version)); |
| 101 UMA_HISTOGRAM_COUNTS("Gamepad.ReadContentionCount", contention_count); | 100 UMA_HISTOGRAM_COUNTS("Gamepad.ReadContentionCount", contention_count); |
| 102 | 101 |
| 103 if (contention_count >= kMaximumContentionCount) { | 102 if (contention_count >= kMaximumContentionCount) { |
| 104 // We failed to successfully read, presumably because the hardware | 103 // We failed to successfully read, presumably because the hardware |
| 105 // thread was taking unusually long. Don't copy the data to the output | 104 // thread was taking unusually long. Don't copy the data to the output |
| 106 // buffer, and simply leave what was there before. | 105 // buffer, and simply leave what was there before. |
| 107 return; | 106 return; |
| 108 } | 107 } |
| 109 | 108 |
| 110 // New data was read successfully, copy it into the output buffer. | 109 // New data was read successfully, copy it into the output buffer. |
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| 135 } | 134 } |
| 136 | 135 |
| 137 void GamepadSharedMemoryReader::GamepadDisconnected( | 136 void GamepadSharedMemoryReader::GamepadDisconnected( |
| 138 int index, | 137 int index, |
| 139 const blink::WebGamepad& gamepad) { | 138 const blink::WebGamepad& gamepad) { |
| 140 if (listener()) | 139 if (listener()) |
| 141 listener()->didDisconnectGamepad(index, gamepad); | 140 listener()->didDisconnectGamepad(index, gamepad); |
| 142 } | 141 } |
| 143 | 142 |
| 144 } // namespace content | 143 } // namespace content |
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