base/files/file_tracing.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/files/file_tracing.h"
   6
   7 #include "base/files/file.h"
   8
   9 namespace base {
  10
  11 namespace {
  12 FileTracing::Provider* g_provider = nullptr;
  13 }
  14
  15 // static
  16 void FileTracing::SetProvider(FileTracing::Provider* provider) {
  17   g_provider = provider;
  18 }
  19
  20 FileTracing::ScopedEnabler::ScopedEnabler() {
  21   if (g_provider)
  22     g_provider->FileTracingEnable(this);
  23 }
  24
  25 FileTracing::ScopedEnabler::~ScopedEnabler() {
  26   if (g_provider)
  27     g_provider->FileTracingDisable(this);
  28 }
  29
  30 FileTracing::ScopedTrace::ScopedTrace() : initialized_(false) {}
  31
  32 FileTracing::ScopedTrace::~ScopedTrace() {
  33   if (initialized_ && g_provider) {
  34     g_provider->FileTracingEventEnd(
  35         name_, &file_->trace_enabler_, file_->path_, size_);
  36   }
  37 }
  38
  39 bool FileTracing::ScopedTrace::ShouldInitialize() const {
  40   return g_provider && g_provider->FileTracingCategoryIsEnabled();
  41 }
  42
  43 void FileTracing::ScopedTrace::Initialize(
  44     const char* name, File* file, int64 size) {
  45   file_ = file;
  46   name_ = name;
  47   size_ = size;
  48   initialized_ = true;
  49
  50   if (g_provider) {
  51     g_provider->FileTracingEventBegin(
  52         name_, &file_->trace_enabler_, file_->path_, size_);
  53   }
  54 }
  55
  56 }  // namespace base