// For each thread, we have a ThreadData that stores all tracking info generated
// on this thread. This prevents the need for locking as data accumulates.

该文件用到了chromium之ThreadLocalStorage

看看头文件

class ThreadData {
public:
typedef std::map<Location, Births*> BirthMap;
typedef std::map<const Births*, DeathData> DeathMap; ThreadData(); // Using Thread Local Store, find the current instance for collecting data.
// If an instance does not exist, construct one (and remember it for use on
// this thread.
// If shutdown has already started, and we don't yet have an instance, then
// return null.
static ThreadData* current(); // For a given about:objects URL, develop resulting HTML, and append to
// output.
static void WriteHTML(const std::string& query, std::string* output); // For a given accumulated array of results, use the comparator to sort and
// subtotal, writing the results to the output.
static void WriteHTMLTotalAndSubtotals(
const DataCollector::Collection& match_array,
const Comparator& comparator, std::string* output); // In this thread's data, find a place to record a new birth.
Births* FindLifetime(const Location& location); // Find a place to record a death on this thread.
void TallyADeath(const Births& lifetimes, const base::TimeDelta& duration); // (Thread safe) Get start of list of instances.
static ThreadData* first();
// Iterate through the null terminated list of instances.
ThreadData* next() const { return next_; } MessageLoop* message_loop() const { return message_loop_; }
const std::string ThreadName() const; // Using our lock, make a copy of the specified maps. These calls may arrive
// from non-local threads.
void SnapshotBirthMap(BirthMap *output) const;
void SnapshotDeathMap(DeathMap *output) const; static void RunOnAllThreads(void (*Func)()); // Set internal status_ to either become ACTIVE, or later, to be SHUTDOWN,
// based on argument being true or false respectively.
// IF tracking is not compiled in, this function will return false.
static bool StartTracking(bool status);
static bool IsActive(); #ifdef OS_WIN
// WARNING: ONLY call this function when all MessageLoops are still intact for
// all registered threads. IF you call it later, you will crash.
// Note: You don't need to call it at all, and you can wait till you are
// single threaded (again) to do the cleanup via
// ShutdownSingleThreadedCleanup().
// Start the teardown (shutdown) process in a multi-thread mode by disabling
// further additions to thread database on all threads. First it makes a
// local (locked) change to prevent any more threads from registering. Then
// it Posts a Task to all registered threads to be sure they are aware that no
// more accumulation can take place.
static void ShutdownMultiThreadTracking();
#endif // WARNING: ONLY call this function when you are running single threaded
// (again) and all message loops and threads have terminated. Until that
// point some threads may still attempt to write into our data structures.
// Delete recursively all data structures, starting with the list of
// ThreadData instances.
static void ShutdownSingleThreadedCleanup();

大致想想怎么用

1. 开始

开始运行,

StartTracking(true)

2. 结束,并输出

StartTracking(false)
WriteHTML(...)

有个测试用例,可以看看
TEST_F(TrackedObjectsTest, MinimalStartupShutdown) {
// Minimal test doesn't even create any tasks.
if (!ThreadData::StartTracking(true))
return; EXPECT_FALSE(ThreadData::first()); // No activity even on this thread.
ThreadData* data = ThreadData::current();
EXPECT_TRUE(ThreadData::first()); // Now class was constructed.
EXPECT_TRUE(data);
EXPECT_TRUE(!data->next());
EXPECT_EQ(data, ThreadData::current());
ThreadData::BirthMap birth_map;
data->SnapshotBirthMap(&birth_map); // Get all birth data
EXPECT_EQ(0u, birth_map.size());
ThreadData::DeathMap death_map;
data->SnapshotDeathMap(&death_map);
EXPECT_EQ(0u, death_map.size());
ThreadData::ShutdownSingleThreadedCleanup(); // Do it again, just to be sure we reset state completely.
ThreadData::StartTracking(true);
EXPECT_FALSE(ThreadData::first()); // No activity even on this thread.
data = ThreadData::current();
EXPECT_TRUE(ThreadData::first()); // Now class was constructed.
EXPECT_TRUE(data);
EXPECT_TRUE(!data->next());
EXPECT_EQ(data, ThreadData::current());
birth_map.clear();
data->SnapshotBirthMap(&birth_map);
EXPECT_EQ(0u, birth_map.size());
death_map.clear();
data->SnapshotDeathMap(&death_map);
EXPECT_EQ(0u, death_map.size());
ThreadData::ShutdownSingleThreadedCleanup();
}

chromium之tracked_objects的更多相关文章

  1. chromium之tracked

    //------------------------------------------------------------------------------ // Tracked is the b ...

  2. 【Chromium中文文档】线程

    线程 转载请注明出处:https://ahangchen.gitbooks.io/chromium_doc_zh/content/zh//General_Architecture/Threading. ...

  3. chromium之task

    // A task is a generic runnable thingy, usually used for running code on a // different thread or fo ...

  4. chromium源码阅读

    linux下chromium的入口函数在文件:src/chrome/app/chrome_exe_main_aura.cc 中 int main(int argc, const char** argv ...

  5. Chromium多线程模型设计和实现分析

    Chromium除了远近闻名的多进程架构之外,它的多线程模型也相当引人注目的.Chromium的多进程架构是为了解决网页的稳定性问题,而多线程模型则是为了解决网页的卡顿问题.为了达到这个目的,Chro ...

  6. QT5利用chromium内核与HTML页面交互

    在QT5.4之前,做QT开发浏览器只能选择QWebkit,但是有过使用的都会发现,这个webkit不是出奇的慢,简直是慢的令人发指,Release模式下还行,debug下你就无语了,但是webkit毕 ...

  7. Google之Chromium浏览器源码学习——base公共通用库(一)

    Google的优秀C++开源项目繁多,其中的Chromium浏览器项目可以说是很具有代表性的,此外还包括其第三开发开源库或是自己的优秀开源库,可以根据需要抽取自己感兴趣的部分.在研究.学习该项目前的时 ...

  8. 如何在windows上编译Chromium (CEF3) 并加入MP3支持(二)

    时隔一年,再次编译cef3,独一无二的目的仍为加入mp3支持.新版本的编译环境和注意事项都已经发生了变化,于是再记录一下. 一.编译版本 cef版本号格式为X.YYYY.A.gHHHHHHH X为主版 ...

  9. 如何在Windows上从源码编译Chromium (CEF3) 加入mp3支持

    一.什么是CEF CEF即Chromium Embeded Framework,由谷歌的开源浏览器项目Chromium扩展而来,可方便地嵌入其它程序中以得到浏览器功能. CEF包括CEF1和CEF3两 ...

随机推荐

  1. 从零开始的全栈工程师——JS面向对象(复习)

    作用域 栈内存:js执行的环境堆内存:存放代码块的空间 存放方式 键值对形式存放 字符串的形式存放js在执行之前 浏览器会给他一个全局作用域叫window 每个作用域下都分为两个模块 一个是内存模块一 ...

  2. jquery获取不了ajax动态添加的内容的解决办法

    在HTML页面的一个button <div class="ajaxClick"> <button>内容</button> </div> ...

  3. Spark应用(app jar)发布到Hadoop集群的过程

    记录了Spark,Hadoop集群的开启,关闭,以及Spark应用提交到Hadoop集群的过程,通过web端监控运行状态. 1.绝对路径开启集群 (每次集群重启,默认配置的hadoop集群中tmp文件 ...

  4. microkernel architecture - Proxy

    The microkernel architecture pattern allows you to add additional application features as plug-ins t ...

  5. 【转】JavaScript 简史

    本文来自众成翻译.JavaScript 毋庸置疑是当今最重要的语言之一.Web 的兴起已经把 JavaScript 带到一个前所未有的地步.下面我们来看看 JavaScript 在其短短历史中是如何演 ...

  6. Windows C/C++ 内存泄露检测

    #pragma once #define _CRTDBG_MAP_ALLOC #include<crtdbg.h> #include<stdlib.h> #include< ...

  7. Oracle自定义行转列函数

    --行转列自定义函数,只针对TABLE1表 --paramType是参数类型,用于判断,param1和param2是条件参数 create or replace function My_concat( ...

  8. jquery:jqery表单属性 值操作

    重置表单(且清空隐藏域)  $('#myform')[0].reset() ​​ DOM属性相关操作 返回属性值 $(selector).attr(attribute) 设置属性值 $(selecto ...

  9. Java应用程序

    示例: public class HelloWorld { public static void main(String[] args) { System.out.println("Hell ...

  10. SpringMvc-helloword

    说明:在此只说明helloword的简单实现,通过helloword例子先了解springMvc是这样工作的,然后在一步步的研究原理 配置web.xml 1.配置servlet servlet-cla ...