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