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Light-City
2020-03-03 10:00:10 +08:00
parent 535b75acfa
commit 16c12a3bc6
38 changed files with 349 additions and 22 deletions
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41
concurrency/Threading_In_CPlusPlus/1.thread/intro.cpp Normal file
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//
// Created by light on 20-1-31.
//
#include <iostream>
#include <chrono>
using namespace std::chrono;
using namespace std;
using ull = unsigned long long;
ull OddSum = 0;
ull EvenSum = 0;
void findEven(ull start, ull end) {
for (ull i = start; i <= end; ++i)
if ((i & 1) == 0)
EvenSum += i;
}
void findOdd(ull start, ull end) {
for (ull i = start; i <= end; ++i)
if ((i & 1) == 1)
OddSum += i;
}
int main() {
ull start = 0, end = 1900000000;
auto startTime = high_resolution_clock::now();
findOdd(start, end);
findEven(start, end);
auto stopTime = high_resolution_clock::now();
auto duration = duration_cast<microseconds>(stopTime - startTime);
cout << "OddSum : " << OddSum << endl;
cout << "EvenSum: " << EvenSum << endl;
cout << "Sec: " << duration.count() / 1000000 << endl;
return 0;
}

56
concurrency/Threading_In_CPlusPlus/1.thread/thread.cpp Normal file
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//
// Created by light on 20-1-31.
//
#include <iostream>
#include <thread>
#include <chrono>
using namespace std::chrono;
using namespace std;
/**
* 1.普通函数指针
* 2.Lambda函数
* 3.Functors
* 4.非静态成员函数
* 5.静态成员函数
*/
using ull = unsigned long long;
ull OddSum = 0;
ull EvenSum = 0;
void findEven(ull start, ull end) {
for (ull i = start; i <= end; ++i)
if ((i & 1) == 0)
EvenSum += i;
}
void findOdd(ull start, ull end) {
for (ull i = start; i <= end; ++i)
if ((i & 1) == 1)
OddSum += i;
}
int main() {
ull start = 0, end = 1900000000;
auto startTime = high_resolution_clock::now();
std::thread t1(findEven,start,end);
std::thread t2(findOdd,start,end);
t1.join();
t2.join();
auto stopTime = high_resolution_clock::now();
auto duration = duration_cast<microseconds>(stopTime - startTime);
cout << "OddSum : " << OddSum << endl;
cout << "EvenSum: " << EvenSum << endl;
cout << "Sec: " << duration.count() / 1000000 << endl;
return 0;
}

23
concurrency/Threading_In_CPlusPlus/2.create_type/1.function_pointer.cpp Normal file
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//
// Created by light on 20-1-31.
//
// 1.函数指针
#include <thread>
#include <iostream>
using namespace std;
void fun(int x) {
while (x-- > 0) {
cout << x << endl;
}
}
// 注意：如果我们创建多线程 并不会保证哪一个先开始
int main() {
std::thread t1(fun, 10);
// std::1.thread t2(fun, 10);
t1.join();
// t2.join();
return 0;
}

31
concurrency/Threading_In_CPlusPlus/2.create_type/2.lambda_function.cpp Normal file
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//
// Created by light on 20-1-31.
//
// 1.函数指针
#include <thread>
#include <iostream>
using namespace std;
// 注意：如果我们创建多线程 并不会保证哪一个先开始
int main() {
// 2.Lambda函数
auto fun = [](int x) {
while (x-- > 0) {
cout << x << endl;
}
};
// std::1.thread t1(fun, 10);
// 也可以写成下面：
std::thread t1_1([](int x) {
while (x-- > 0) {
cout << x << endl;
}
}, 11);
// std::1.thread t2(fun, 10);
// t1.join();
t1_1.join();
// t2.join();
return 0;
}

25
concurrency/Threading_In_CPlusPlus/2.create_type/3.functor.cpp Normal file
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//
// Created by light on 20-1-31.
//
#include <thread>
#include <iostream>
using namespace std;
// 3.functor (Funciton Object)
class Base {
public:
void operator()(int x) {
while (x-- > 0) {
cout << x << endl;
}
}
};
int main() {
thread t(Base(), 10);
t.join();
return 0;
}

26
concurrency/Threading_In_CPlusPlus/2.create_type/4.no_static_member_function.cpp Normal file
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//
// Created by light on 20-1-31.
//
#include <thread>
#include <iostream>
using namespace std;
// 4.Non-static member function
class Base {
public:
void fun(int x) {
while (x-- > 0) {
cout << x << endl;
}
}
};
int main() {
Base b;
thread t(&Base::fun,&b, 10);
t.join();
return 0;
}

25
concurrency/Threading_In_CPlusPlus/2.create_type/5.static_member_function.cpp Normal file
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//
// Created by light on 20-1-31.
//
#include <thread>
#include <iostream>
using namespace std;
// 4.Non-static member function
class Base {
public:
static void fun(int x) {
while (x-- > 0) {
cout << x << endl;
}
}
};
int main() {
thread t(&Base::fun, 10);
t.join();
return 0;
}

34
concurrency/Threading_In_CPlusPlus/3.join_detach/detach.cpp Normal file
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//
// Created by light on 20-1-31.
//
// join 注意点
/**
* 这用于从父线程分离新创建的线程
* 在分离线程之前，请务必检查它是否可以joinable，
* 否则可能会导致两次分离，并且双重detach()将导致程序终止
* 如果我们有分离的线程并且main函数正在返回，那么分离的线程执行将被挂起
*/
#include <iostream>
#include <thread>
#include <chrono>
#include <mutex>
using namespace std;
void run(int count) {
while (count-- > 0) {
cout << count << endl;
}
std::this_thread::sleep_for(chrono::seconds(3));
}
int main() {
thread t1(run, 10);
cout << "main()" << endl;
t1.detach();
if(t1.joinable())
t1.detach();
cout << "main() after" << endl;
return 0;
}

35
concurrency/Threading_In_CPlusPlus/3.join_detach/join.cpp Normal file
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//
// Created by light on 20-1-31.
//
// join 注意点
/**
* 一旦线程开始，我们要想等待线程完成，需要在该对象上调用join()
* 双重join将导致程序终止
* 在join之前我们应该检查显示是否可以被join,通过使用joinable()
*/
#include <iostream>
#include <thread>
#include <chrono>
using namespace std;
void run(int count) {
while (count-- > 0) {
cout << count << endl;
}
std::this_thread::sleep_for(chrono::seconds(3));
}
int main() {
thread t1(run, 10);
cout << "main()" << endl;
t1.join();
if (t1.joinable()) {
t1.join();
}
cout << "main() after" << endl;
return 0;
}

34
concurrency/Threading_In_CPlusPlus/4.mutex/critical_section.cpp Normal file
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//
// Created by light on 20-2-1.
//
#include <iostream>
#include <mutex>
#include <thread>
using namespace std;
int sum = 0; //shared
mutex m;
void *countgold() {
int i; //local to each thread
for (i = 0; i < 10000000; i++) {
m.lock();
sum += 1;
m.unlock();
}
return NULL;
}
int main() {
thread t1(countgold);
thread t2(countgold);
//Wait for both threads to finish
t1.join();
t2.join();
cout << "sum = " << sum << endl;
return 0;
}

16
concurrency/Threading_In_CPlusPlus/CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.14)
project(Threading_In_CPlusPlus)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
add_executable(intro 1.thread/intro.cpp)
add_executable(1.thread 1.thread/thread.cpp)
add_executable(1.function_pointer 2.create_type/1.function_pointer.cpp)
add_executable(2.lambda_function 2.create_type/2.lambda_function.cpp)
add_executable(3.functor 2.create_type/3.functor.cpp)
add_executable(4.static_member_function 2.create_type/4.no_static_member_function.cpp)
add_executable(5.static_member_function 2.create_type/5.static_member_function.cpp)
add_executable(join 3.join_detach/join.cpp)
add_executable(detach 3.join_detach/detach.cpp)
add_executable(critical_section 4.mutex/critical_section.cpp)

20
concurrency/concurrency_v1/chapter1/1_helloworld.cpp Normal file
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//
// Created by light on 19-11-5.
//
#include <iostream>
#include <thread>
#include <unistd.h>
using namespace std;
void hello() {
cout << "hello world" << endl;
}
int main() {
thread t(hello);
t.join(); // must add this line otherwise will failed!
// 需要注意的是线程对象执行了join后就不再joinable了，所以只能调用join一次。
return 0;
}

108
concurrency/concurrency_v1/chapter2/2.1_basic.cpp Normal file
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//
// Created by light on 19-11-5.
//
#include <iostream>
#include <thread>
#include <unistd.h>
#include <cassert>
using namespace std;
class background_task {
public:
void operator()() const {
cout << "ok" << endl;
}
};
void do_something(int &i) {
cout << "do_something" << endl;
}
struct func {
int &i;
func(int &i_) : i(i_) {}
void operator()() {
for (unsigned j = 0; j < 1000000; ++j) {
do_something(i); // 1. 潜在访问隐患：悬空引用
}
}
};
// 特殊情况下的等待
void f() {
int some_local_state = 0;
func my_func(some_local_state);
std::thread t(my_func);
try {
// do_something_in_current_thread();
}
catch (...) {
t.join(); // 1
throw;
}
t.join(); // 2
}
// try catch 只能捕获轻量级错误,所以如需确保线程在函数之前结束——查看是否因为线程函数使用了局部变量的引用，
// 以及其他原因——而后再确定一下程序可能会退出的途径，无论正常与否，可以提供一个简洁的机制，来做解决这个问题。
// 一种方式是使用“资源获取即初始化方式”(RAII，Resource Acquisition Is Initialization)，并且提供一个类，在析构函数中使用join()，
// std::thread支持移动的好处是可以创建thread_guard类的实例，并且拥有其线程的所有权。
class thread_guard {
std::thread &t;
public:
explicit thread_guard(std::thread &t_) :
t(t_) {}
~thread_guard() {
if (t.joinable()) // 1
{
t.join(); // 2
}
}
thread_guard(thread_guard const &) = delete; // 3
thread_guard &operator=(thread_guard const &) = delete;
};
void f1()
{
int some_local_state=0;
func my_func(some_local_state);
std::thread t(my_func);
thread_guard g(t);
// do_something_in_current_thread();
} // 4
// 当线程执行到4处时，局部对象就要被逆序销毁了。因此，thread_guard对象g是第一个被销毁的，
// 这时线程在析构函数中被加入2到原始线程中。
// 即使do_something_in_current_thread抛出一个异常，这个销毁依旧会发生。
int main() {
background_task f;
// thread t(f); // ok
// t.join();
//声明一个名为my_threadx的函数,这个函数带有一个参数(函数指针指向没有参数并返回background_task对象的函数)，返回一个std::thread对象的函数
// thread my_thread1(background_task());
// 针对Most Vexing Parse问题解决如下：
// thread my_thread1((background_task())); // 多组括号
// my_thread1.join();
// thread my_thread2{background_task()}; // 新的初始化语法
// my_thread2.join();
// thread myThread([](){
// cout<<"ok"<<endl;
// });
// myThread.join();
// 后台运行线程
std::thread t(f);
t.detach();
assert(!t.joinable());
return 0;
}

27
concurrency/concurrency_v1/chapter2/2.2_transfer.cpp Normal file
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//
// Created by light on 19-11-5.
//
#include <iostream>
#include <thread>
using namespace std;
class X {
public:
void do_length_work() {};
};
void process_big_object(std::unique_ptr<X>);
int main() {
X my_x;
thread t(&X::do_length_work, &my_x); // 1
std::unique_ptr<X> p(new X);
p->do_length_work();
std::thread tt(process_big_object,std::move(p));
//std::thread实例的可移动且不可复制性。不可复制保性证了在同一时间点，
// 一个std::thread实例只能关联一个执行线程；可移动性使得程序员可以自己决定，哪个实例拥有实际执行线程的所有权。
return 0;
}

78
concurrency/concurrency_v1/chapter2/2.3_ownership.cpp Normal file
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//
// Created by light on 19-11-5.
//
#include <iostream>
#include <thread>
#include <unistd.h>
#include <vector>
#include <algorithm>
using namespace std;
void some_function() {}
void some_other_function() {}
// std::thread不支持拷贝语义。
// std::thread支持移动语义。
// scoped_thread实例
void do_something(int i) {
cout << i << endl;
}
struct func {
int &i;
func(int &i_) : i(i_) {}
void operator()() {
for (unsigned j = 0; j < 1000000; ++j) {
do_something(i);
}
}
};
class scoped_thread {
std::thread t;
public:
explicit scoped_thread(std::thread t_) : // 1
t(std::move(t_)) {
if (!t.joinable()) // 2
throw std::logic_error("No thread");
}
~scoped_thread() {
t.join(); // 3
}
scoped_thread(scoped_thread const &) = delete;
scoped_thread &operator=(scoped_thread const &) = delete;
};
void do_work(unsigned id) {}
void f() {
std::vector<std::thread> threads;
for (unsigned i = 0; i < 20; ++i) {
threads.push_back(std::thread(do_work, i)); // 产生线程
}
std::for_each(threads.begin(), threads.end(),
std::mem_fn(&std::thread::join)); // 对每个线程调用join()
}
int main() {
// std::thread t1(some_function); // 构造一个thread对象t1
// std::thread t2 = std::move(t1); // 把t1 move给另外一个thread对象t2，t1不再管理之前的线程了。
// // 这句不需要std::move()，从临时变量进行移动是自动和隐式的。调用的是operator=(std::thread&&)
// t1 = std::thread(some_other_function);
// std::thread t3;
// t3 = std::move(t2); // 把t2 move给t3
// // 把t3 move给t1，非法。因为`t1`已经有了一个相关的线程，会调用`std::terminate()`来终止程序。
// t1 = std::move(t3);
f();
return 0;
}

60
concurrency/concurrency_v1/chapter2/2.4_runtime.cpp Normal file
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//
// Created by light on 19-11-5.
//
#include <iostream>
#include <algorithm>
#include <thread>
#include <vector>
#include <numeric>
using namespace std;
//使得每个线程具有最小数目的元素以避免过多的线程开销
template<typename Iterator, typename T>
struct accumulate_block {
void operator()(Iterator first, Iterator last, T &result) {
result = std::accumulate(first, last, result);
}
};
template<typename Iterator, typename T>
T parallel_accumlate(Iterator first, Iterator last, T init) {
unsigned long const length = std::distance(first, last);
if (!length)
return init;
unsigned long const min_per_thread = 25;
unsigned long const max_threads = (length + min_per_thread - 1) / min_per_thread;
cout<<max_threads<<endl;
unsigned long const hardware_threads = std::thread::hardware_concurrency();
cout<<hardware_threads<<endl;
unsigned long const num_threads = std::min(hardware_threads != 0 ? hardware_threads : 2, max_threads);
cout<<num_threads<<endl;
unsigned long const block_size = length / num_threads;
cout<<block_size<<endl;
std::vector<T> results(num_threads);
std::vector<std::thread> threads(num_threads - 1);
Iterator block_start = first;
for (unsigned long i = 0; i < (num_threads - 1); ++i) {
Iterator block_end = block_start;
std::advance(block_end, block_size);
threads[i] = std::thread(accumulate_block<Iterator, T>(), block_start, block_end, std::ref(results[i]));
block_start = block_end;
}
accumulate_block<Iterator, T>()(block_start, last, results[num_threads - 1]);
std::for_each(threads.begin(), threads.end(), std::mem_fn(&std::thread::join));
return std::accumulate(results.begin(), results.end(), init);
}
int main() {
vector<int> v{3,4,5,6};
int res=0;
cout<<parallel_accumlate(v.begin(),v.end(),res);
return 0;
}

34
concurrency/concurrency_v1/chapter2/2_5_id.cpp Normal file
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//
// Created by light on 19-11-5.
//
#include <iostream>
#include <thread>
using namespace std;
// 线程的通用标识符
std::thread::id master_thread;
void do_master_thread_work() {
cout << "master" << endl;
}
void do_common_work() {
cout << "common" << endl;
}
void some_core_part_of_algorithm() {
if (std::this_thread::get_id() == master_thread) {
do_master_thread_work();
}
do_common_work();
}
int main() {
std::cout << std::this_thread::get_id() << endl;
thread t(some_core_part_of_algorithm);
t.join();
return 0;
}