From 8edbbbc5a21c015589ee04a31f58b69df18c6fc2 Mon Sep 17 00:00:00 2001 From: Light-City <455954986@qq.com> Date: Tue, 5 Nov 2019 16:56:07 +0800 Subject: [PATCH] update --- ..gitignore.un~ | Bin 0 -> 523 bytes .com.sh.un~ | Bin 0 -> 3182 bytes .gitignore | 1 + .gitignore~ | 0 README.md | 76 +++++++----- {:: => basic_content/::}/:: | Bin {:: => basic_content/::}/::.cpp | 0 {:: => basic_content/::}/README.md | 0 .../abstract}/README.md | 0 .../abstract}/abstract.cpp | 0 .../abstract}/derived_full.cpp | 0 .../abstract}/interesting_facts1.cpp | 0 .../abstract}/interesting_facts2.cpp | 0 .../abstract}/interesting_facts3.cpp | 0 .../abstract}/interesting_facts4.cpp | 0 .../abstract}/interesting_facts5.cpp | 0 .../abstract}/pure_virtual.cpp | 0 {abstract => basic_content/abstract}/test.cpp | 0 {assert => basic_content/assert}/README.md | 0 {assert => basic_content/assert}/assert | Bin {assert => basic_content/assert}/assert.c | 0 {assert => basic_content/assert}/iga | Bin 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b/..gitignore.un~ new file mode 100644 index 0000000000000000000000000000000000000000..c3cd99e7128c255194c23491708f677a8f20a42d GIT binary patch literal 523 zcmWH`%$*;a=aT=Ffyr8A(-e#Ek3I^9EKoQrTJdJX>b0uT?Ppi9e4hR3&-4a&1_lO3 zAO-h$B?<+l#R~aFndzB%3b~2JC8L32*e;71VA(lGsGUWaAX0=GBU(p0LcOY z6NCbj5Gkm@e;{CBMv@(6QaJ>G(IE+r4hDv=5@=?FqJqJ+5gbh*HgZIOq6{8Y;AjG? z2I&|D)DHn*G%4bXCN5?Dq|7}1q{QM3XoP_x2$WM{02Fzn5e5qln$y4tQ$mg~I0JF|(ZJ+a75x!^>LyNZ3f|SIPR9K!v&Tk-Bf+7->55W;S8hM}~p(OxDo&z}Y7$FTuP`-fy OP_>4=hhW +#include +#include + +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; +} \ No newline at end of file diff --git a/concurrency_v1/chapter2/2.1_basic.cpp b/concurrency_v1/chapter2/2.1_basic.cpp new file mode 100644 index 00000000..8af63d17 --- /dev/null +++ b/concurrency_v1/chapter2/2.1_basic.cpp @@ -0,0 +1,108 @@ +// +// Created by light on 19-11-5. +// + +#include +#include +#include +#include + +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"< +#include + +using namespace std; + +class X { +public: + void do_length_work() {}; +}; + +void process_big_object(std::unique_ptr); + +int main() { + X my_x; + thread t(&X::do_length_work, &my_x); // 1 + + + std::unique_ptr 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; +} \ No newline at end of file diff --git a/concurrency_v1/chapter2/2.3_ownership.cpp b/concurrency_v1/chapter2/2.3_ownership.cpp new file mode 100644 index 00000000..cdbc4c3a --- /dev/null +++ b/concurrency_v1/chapter2/2.3_ownership.cpp @@ -0,0 +1,78 @@ +// +// Created by light on 19-11-5. +// +#include +#include +#include +#include +#include + +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 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; +} \ No newline at end of file diff --git a/concurrency_v1/chapter2/2.4_runtime.cpp b/concurrency_v1/chapter2/2.4_runtime.cpp new file mode 100644 index 00000000..9928aa9f --- /dev/null +++ b/concurrency_v1/chapter2/2.4_runtime.cpp @@ -0,0 +1,60 @@ +// +// Created by light on 19-11-5. +// +#include +#include +#include +#include +#include + +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 +struct accumulate_block { + void operator()(Iterator first, Iterator last, T &result) { + result = std::accumulate(first, last, result); + } +}; + +template +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< results(num_threads); + std::vector 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(), block_start, block_end, std::ref(results[i])); + block_start = block_end; + } + accumulate_block()(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 v{3,4,5,6}; + int res=0; + cout< +#include + +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; +} \ No newline at end of file diff --git a/effective_c++/2.cpp b/effective_c++/2.cpp new file mode 100644 index 00000000..428f3b19 --- /dev/null +++ b/effective_c++/2.cpp @@ -0,0 +1,50 @@ +// +// Created by light on 19-9-11. +// + +#include + +using namespace std; +struct A { +#define p "hello" +}; + +class C { +public: + // static const 可以直接在类内部初始化 + // no-const static 只能在外面初始化 + static const int NUM = 3; //声明 + enum con { + NUM1 = 3 + }; +}; + +#define MAX(a,b) ((a) > (b) ? (a) : (b)) +template +inline int Max(const T& a, const T& b){ + return (a>b ? a:b); +} +const int C::NUM; // 定义 +int main() { + cout << p << endl; // macro is global + C c; + cout << &c.NUM << endl; // 未定义的引用,需要定义 + + cout << C::NUM1 << endl; +// cout << &C:NUM1 << endl; //error enum no address + + int a=5, b=0; + cout<