add stack pool (#349)

Author: loongs-zhang

README.md

@@ -10,16 +10,18 @@
 
 The `open-coroutine` is a simple, efficient and generic stackful-coroutine library.
 
+English | [中文](README_ZH.md)
+
 ## 🚀 Features
 
 - [x] Preemptive(`not supported in windows`): even if the coroutine enters a dead loop, it can still be seized, see [example](https://github.com/loongs-zhang/open-coroutine/blob/master/open-coroutine/examples/preemptive.rs);
 - [x] Hook: you are free to use most of the slow system calls in coroutine;
 - [x] Scalable: the size of the coroutine stack supports unlimited expansion without the cost of copying stack, and immediately shrinks to the original size after use, see [example](https://github.com/loongs-zhang/open-coroutine/blob/master/open-coroutine/examples/scalable_stack.rs);
 - [x] io_uring(`only in linux`): supports and is compatible with io_uring in terms of local file IO and network IO. If it's not supported on your system, it will fall back to non-blocking IO;
 - [x] Priority: support custom task and coroutine priority;
-- [x] Work Stealing: internally using a lock free work steel queue;
-- [x] Compatibility: the implementation of open-coroutine is no async, but it is compatible with async, which means you can use this crate in tokeno/sync-std/smol/...;
-- [x] Platforms: running on Linux, MacOS and Windows;
+- [x] Work Stealing: internally using a lock free work steal queue;
+- [x] Compatibility: the implementation of open-coroutine is no async, but it is compatible with async, which means you can use this crate in tokio/async-std/smol/...;
+- [x] Platforms: running on Linux, macOS and Windows;
 
 ## 🕊 Roadmap
 
@@ -74,7 +76,7 @@ fn main() {
             })
             .expect("allocate stack failed")
         }
-        println!("[coroutine] launched");
+        println!("[task] launched");
         // Use ~500KB of stack.
         recurse(50, &mut [0; 10240]);
     }, ());

README_ZH.md

@@ -0,0 +1,88 @@
+# open-coroutine
+
+[![crates.io](https://img.shields.io/crates/v/open-coroutine.svg)](https://crates.io/crates/open-coroutine)
+[![docs.rs](https://img.shields.io/badge/docs-release-blue)](https://docs.rs/open-coroutine)
+[![LICENSE](https://img.shields.io/github/license/acl-dev/open-coroutine.svg?style=flat-square)](https://github.com/acl-dev/open-coroutine/blob/master/LICENSE-APACHE)
+[![Build Status](https://github.com/acl-dev/open-coroutine/workflows/CI/badge.svg)](https://github.com/acl-dev/open-coroutine/actions)
+[![Codecov](https://codecov.io/github/acl-dev/open-coroutine/graph/badge.svg?token=MSM3R7CBEX)](https://codecov.io/github/acl-dev/open-coroutine)
+[![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/acl-dev/open-coroutine.svg)](http://isitmaintained.com/project/acl-dev/open-coroutine "Average time to resolve an issue")
+[![Percentage of issues still open](http://isitmaintained.com/badge/open/acl-dev/open-coroutine.svg)](http://isitmaintained.com/project/acl-dev/open-coroutine "Percentage of issues still open")
+
+`open-coroutine`是一个简单、高效、通用的有栈协程库。
+
+[English](README.md) | 中文
+
+## 🚀 当前特性
+
+- [x] 抢占调度(`不支持windows`): 即使协程进入死循环，它仍能被抢占，查看[例子](https://github.com/loongs-zhang/open-coroutine/blob/master/open-coroutine/examples/preemptive.rs);
+- [x] Hook: 您可以在协程中自由使用大多数慢系统调用;
+- [x] 可伸缩栈: 协程栈的大小支持无限制扩容而没有复制堆栈的开销，查看[例子](https://github.com/loongs-zhang/open-coroutine/blob/master/open-coroutine/examples/scalable_stack.rs);
+- [x] io_uring(`只支持linux`): 在本地文件IO和网络IO方面支持并兼容io_uring。如果您的系统不支持，它将回退到NIO;
+- [x] 优先级: 支持自定义任务和协程的优先级;
+- [x] 任务窃取: 内部使用无锁任务窃取队列;
+- [x] 兼容性: open-coroutine的实现是No async的，但它与async兼容，这意味着您可以在tokio/sync-std/smol/...中使用这个crate;
+- [x] 跨平台: 支持Linux、macOS和Windows;
+
+## 🕊 未来计划
+
+- [ ] 支持`#[open_coroutine::all_join]`和`#[open_coroutine::any_join]`宏;
+- [ ] 增加并发工具包;
+- [ ] 支持AF_XDP套接字;
+
+## 📖 快速接入
+
+### step1: 在你的Cargo.toml中添加依赖
+
+```toml
+[dependencies]
+# check https://crates.io/crates/open-coroutine
+open-coroutine = "x.y.z"
+```
+
+### step2: 添加宏
+
+```rust
+#[open_coroutine::main]
+fn main() {
+    //......
+}
+```
+
+### step3: 创建任务
+
+```rust
+#[open_coroutine::main]
+fn main() {
+    let task = open_coroutine::task!(|param| {
+        assert_eq!(param, 1);
+    }, 1);
+    task.timeout_join(std::time::Duration::from_secs(1)).expect("timeout");
+}
+```
+
+### step4: 扩容栈(可选)
+
+```rust
+#[open_coroutine::main]
+fn main() {
+    _ = open_coroutine::task!(|_| {
+        fn recurse(i: u32, p: &mut [u8; 10240]) {
+            open_coroutine::maybe_grow!(|| {
+                // Ensure the stack allocation isn't optimized away.
+                unsafe { _ = std::ptr::read_volatile(&p) };
+                if i > 0 {
+                    recurse(i - 1, &mut [0; 10240]);
+                }
+            })
+            .expect("allocate stack failed")
+        }
+        println!("[task] launched");
+        // Use ~500KB of stack.
+        recurse(50, &mut [0; 10240]);
+    }, ());
+}
+```
+
+## ⚓ 学习更多
+
+[我有故事,你有酒吗?](https://github.com/acl-dev/open-coroutine-docs)

core/src/coroutine/korosensei.rs

@@ -307,8 +307,6 @@ impl<'c, Param, Yield, Return> Coroutine<'c, Param, Yield, Return> {
         stack_size: usize,
         callback: F,
     ) -> std::io::Result<R> {
-        // if we can't guess the remaining stack (unsupported on some platforms) we immediately grow
-        // the stack and then cache the new stack size (which we do know now because we allocated it.
         if let Some(co) = Self::current() {
             let remaining_stack = unsafe { co.remaining_stack() };
             if remaining_stack >= red_zone {
@@ -325,6 +323,8 @@ impl<'c, Param, Yield, Return> Coroutine<'c, Param, Yield, Return> {
             });
         }
         // in thread
+        // if we can't guess the remaining stack (unsupported on some platforms) we immediately grow
+        // the stack and then cache the new stack size (which we do know now because we allocated it).
         thread_local! {
             #[allow(clippy::missing_const_for_thread_local)]
             static STACK_INFOS: RefCell<VecDeque<StackInfo>> = const { RefCell::new(VecDeque::new()) };