如何在C ++中实现Coroutines [英] How do you implement Coroutines in C++

问题描述

我怀疑它可以移植，但有什么解决方案吗？我认为可以通过创建一个备用堆栈，并在功能输入上重置SP，BP和IP，并具有yield保存IP和恢复SP + BP。析构函数和异常安全似乎很棘手，但可解决。

I doubt it can be done portably, but are there any solutions out there? I think it could be done by creating an alternate stack and reseting SP,BP, and IP on function entry, and having yield save IP and restore SP+BP. Destructors and exception safety seem tricky but solvable.

已经完成了吗？是不可能的

Has it been done? Is it impossible?

推荐答案

是的，可以完成所有你需要的是一个小的汇编代码，将调用堆栈移动到堆上新分配的堆栈。

Yes it can be done without a problem. All you need is a little assembly code to move the call stack to a newly allocated stack on the heap.

我会查看 boost :: coroutine 库。

I would look at the boost::coroutine library.

你应该注意的一件事是堆栈溢出。在大多数操作系统溢出堆栈将导致segfault，因为虚拟内存页没有映射。但是，如果你在堆上分配堆栈，你不会得到任何保证。
只要记住这一点。

The one thing that you should watch out for is a stack overflow. On most operating systems overflowing the stack will cause a segfault because virtual memory page is not mapped. However if you allocate the stack on the heap you don't get any guarantee. Just keep that in mind.

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