1.安装与说明

安装

sudo apt install libboost-coroutine1.71-dev

编译链接

libboost-coroutine不支持.pc格式查看, 支持.cmake导入
cat /usr/lib/x86_64-linux-gnu/cmake/boost_coroutine-1.71.0/boost_coroutine-config.cmake
cat /usr/lib/x86_64-linux-gnu/cmake/boost_coroutine-1.71.0/libboost_coroutine-variant-shared.cmake

list(APPEND _BOOST_COROUTINE_DEPS atomic chrono context thread headers)

可知依赖: atomic chrono context thread

从安装路径可知
头文件路径: /usr/include/boost/coroutine2/coroutine.hpp
/usr/include/boost/coroutine2/all.hpp
库文件路径: /usr/lib/x86_64-linux-gnu/libboost_coroutine.so

故从路径可知
编译选项:
链接选项: -lboost_coroutine -lboost_context

2.实例

1.代码

1_boost.coroutine2协程实例.cc

#include <iostream>
#include <boost/coroutine2/all.hpp>// 协程函数，接收一个 sink 对象作为参数，用于输出数据
void fibonacci(boost::coroutines2::coroutine<int>::push_type& sink) {int a = 0, b = 1;while (true) {sink(a);std::tie(a, b) = std::make_tuple(b, a + b);if (a > 100) break; // 限制输出前10个斐波那契数}
}int main() {// 创建一个 pull 类型的协程对象，它将调用 fibonacci 函数boost::coroutines2::coroutine<int>::pull_type source(fibonacci);// 从协程中拉取并打印斐波那契数while (source) {std::cout << "Main: " << source.get() << std::endl;source();}std::cout << std::endl;return 0;
}

2_boost.coroutine2_协程.cc

#include<iostream>
#include<boost/coroutine2/coroutine.hpp>using namespace boost::coroutines2;void coro_function(coroutine<int>::push_type& sink) {for (int i = 0; i < 5; ++i){std::cout << "Coroutine: " << i << std::endl;sink(i);}
}int main() {coroutine<int>::pull_type source(coro_function);while (source){std::cout << "Main: " << source.get() << std::endl;source();}return 0;
}

2.scons构建

SConstruct

## 模板1
import os
env = Environment()
env["PROGSUFFIX"] = ".out"              # 可执行文件后缀.out
env["CCFLAGS"] = " -g3 -O0 -Wall"       # gdb 调试
env["LIBS"] = ["boost_coroutine","boost_context"]sources=0
ccflags=1
linkflags=2
target_list = ["1_boost.coroutine2协程实例.cc","2_boost.coroutine2_协程.cc",
]
for target in target_list:if isinstance(target,(str)):env.Program(Split(target))elif isinstance(target,(list)):env.Program(Split(target[sources]),CCFLAGS=target[ccflags]+env["CCFLAGS"],LINKFLAGS=target[linkflags]+env["LINKFLAGS"])

scons

scons: Reading SConscript files …
scons: done reading SConscript files.
scons: Building targets …
g++ -o 1_boost.coroutine2协程实例.o -c -g3 -O0 -Wall 1_boost.coroutine2协程实例.cc
g++ -o 1_boost.coroutine2协程实例.out 1_boost.coroutine2协程实例.o -lboost_coroutine -lboost_context
g++ -o 2_boost.coroutine2_协程.o -c -g3 -O0 -Wall 2_boost.coroutine2_协程.cc
g++ -o 2_boost.coroutine2_协程.out 2_boost.coroutine2_协程.o -lboost_coroutine -lboost_context
scons: done building targets.

3.运行

gitee在线代码

协程看打印结果,意义不大;
建议gdb调试, 跟踪查看协程是如何跳转, 流程处理顺序;
这样才能掌握的更深一些, 写出有价值的协程处理.

思考

1. 2个例子, 只做了2个协程相互交替运行
2. 如何像python asyncio, 多个协议同时交替运行
3. 对应系统调用阻塞API,read/select/sleep, 是否能够切换到另一个协程

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