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uzcoroutine's Introduction

uzcoroutine

汇编实现简单的非对称有栈协程库

  • 目前仅支持x86_64架构
  • 使用状态机判断协程运行状态来控制相关逻辑
  • cocontext.S用汇编实现了上下文获取与上下文切换，忽略浮点数和信号的切换
  • coctx实现了保存上下文的数据结构和用于上下文初始化的make函数
  • uzcoroutine实现了resume和yield等方法，为协程库的主要逻辑

不使用ucontext主要原因是osx取消了ucontext（公司电脑与云服务器系统不一样QAQ），故对于mac选手可以考虑实现汇编的上下文切换，同时也可以适配其他x86_64架构的机子

ucontext

coctx中的ucontext为保存上下文的数据结构，仅使用14个寄存器，不对浮点数和信号进行上下文的保存 ucontext

co_make、co_swap

协程在resume中直接使用co_make进行初始化，使用状态机来判断运行状态进行相应的切换。 co_make初始化最关键的设置了ret addr、rdi、rsi，当切换完成时co_swap会将regs[12]即ret addr压入栈中，当ret时会使用栈中最后一个地址作为rip指令，同时利用保存的rdi和rsi作为参数，实现了初始的运行函数，该项目初始化函数为mainfunc makeswap

后续

该项目简单的实现了一个非共享栈的协程库，后续会实现共享栈版本的协程库，即实现一个save_stack的函数

相关参考

云风/coroutine
linux/ucontext
Tencent/libco
alibaba/coobjc

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