Repo created

TMessagesProj/jni/voip/webrtc/base/files/file_tracing.cc

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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/files/file_tracing.h"
+
+#include "base/atomicops.h"
+#include "base/files/file.h"
+
+using base::subtle::AtomicWord;
+
+namespace base {
+
+namespace {
+AtomicWord g_provider;
+}
+
+FileTracing::Provider* GetProvider() {
+  AtomicWord provider = base::subtle::Acquire_Load(&g_provider);
+  return reinterpret_cast<FileTracing::Provider*>(provider);
+}
+
+// static
+bool FileTracing::IsCategoryEnabled() {
+  FileTracing::Provider* provider = GetProvider();
+  return provider && provider->FileTracingCategoryIsEnabled();
+}
+
+// static
+void FileTracing::SetProvider(FileTracing::Provider* provider) {
+  base::subtle::Release_Store(&g_provider,
+                              reinterpret_cast<AtomicWord>(provider));
+}
+
+FileTracing::ScopedEnabler::ScopedEnabler() {
+  FileTracing::Provider* provider = GetProvider();
+  if (provider)
+    provider->FileTracingEnable(this);
+}
+
+FileTracing::ScopedEnabler::~ScopedEnabler() {
+  FileTracing::Provider* provider = GetProvider();
+  if (provider)
+    provider->FileTracingDisable(this);
+}
+
+FileTracing::ScopedTrace::ScopedTrace() : id_(nullptr) {}
+
+FileTracing::ScopedTrace::~ScopedTrace() {
+  if (id_) {
+    FileTracing::Provider* provider = GetProvider();
+    if (provider)
+      provider->FileTracingEventEnd(name_, id_);
+  }
+}
+
+void FileTracing::ScopedTrace::Initialize(const char* name,
+                                          const File* file,
+                                          int64_t size) {
+  id_ = &file->trace_enabler_;
+  name_ = name;
+  GetProvider()->FileTracingEventBegin(name_, id_, file->tracing_path_, size);
+}
+
+}  // namespace base