我把协程相关的源码提取出来，写了个测试程序（仿造github.com/cloudwu/cor…），便于理解：
看runtime_.Resume(id)这一行，就是执行当前的协程，这个协程在创建的时候被定位到执行关联的函数处，这个具体实现在uthread_context_system.cpp中，所以当runtime_.Resume(id)时候其实就是执行foo函数。
//https://github.com/Tencent/phxrpc
//https://www.jianshu.com/p/4d95eb7af24b
#include "uthread_runtime.h"
#include <functional>
phxrpc::UThreadRuntime *runtime_;
static void foo(int arg) {
int start = arg;
for (int i = 0; i < 5; i++)
{
printf("coroutine %d : %d\n", runtime_->GetCurrUThread(), start + i);
runtime_->Yield();//放弃
}
}
static void test() {
int arg1 = { 0 };
int arg2 = { 100 };
int co1 = runtime_->Create(std::bind(&foo, arg1), nullptr);
int co2 = runtime_->Create(std::bind(&foo, arg2), nullptr);
printf("main start\n");
while (!runtime_->IsAllDone())
{
runtime_->Resume(co1);//执行
runtime_->Resume(co2);
printf("GetUnfinishedItemCount:%d\n", runtime_->GetUnfinishedItemCount());
}
printf("main end\n");
}
int main(int argc, char *argv[])
{
runtime_ = new phxrpc::UThreadRuntime(8192, false);
test();
delete runtime_;
return 0;
}
运行结果是：
main start
coroutine 0 : 0
coroutine 1 : 100
GetUnfinishedItemCount:2
coroutine 0 : 1
coroutine 1 : 101
GetUnfinishedItemCount:2
coroutine 0 : 2
coroutine 1 : 102
GetUnfinishedItemCount:2
coroutine 0 : 3
coroutine 1 : 103
GetUnfinishedItemCount:2
coroutine 0 : 4
coroutine 1 : 104
GetUnfinishedItemCount:2
GetUnfinishedItemCount:0
main end
完整的工程下载地址是：download.csdn.net/download/li…
另外推荐一个案例：
coroutine example, using phxrpc coroutine framework, receive data from upstream and set redis, qps 12w
download.csdn.net/download/hi…
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参考文献：
github.com/Nickqiaoo/c… 带注释的版本
blog.csdn.net/LMFQYJ/arti… 云风coroutine源码分析
blog.csdn.net/Swartz2015/… 从云风的coroutine库学习协程
