src/runtime/chan.go: // Invariants: // At least one of c.sendq and c.recvq is empty, // except for the case of an unbuffered channel with a single goroutine // blocked on it for both sending and receiving using a select statement, // in which case the length of c.sendq and c.recvq is limited only by the // size of the select statement. // // For buffered channels, also: // c.qcount > 0 implies that c. ...
源码 # # 下载 git clone git@github.com:bytecodealliance/wasmtime.git # 子模块 git submodule update --init --recursive # 安装 cargo build 如果忘了拉子模块，vscode的rust-analyzer会报错，导致智能提示等功能失效。 不过整个初始化过程还是有点长，等了好久才能正常使用。 阅读 # 从build.rs开始，首先映入眼帘的是use anyhow::Context;： /// Provides the `context` method for `Result`. /// /// This trait is sealed and cannot be implemented for types outside of /// `anyhow`. 这是一个为其它类型（anyhow::Result）引入context方法的特征啊，多么伟大，在anyhow包外面的类型就不要想着去实现它了，你们高攀不起的。 再看anyhow::Context的定义： // lib.rs:598 pub trait Context<T, E>: context::private::Sealed { // 继承了Sealed，那它又是怎么样的、做什么的呢？ /// Wrap the error value with additional context. -- 给error值包装上下文信息 fn context<C>(self, context: C) -> Result<T, Error> where C: Display + Send + Sync + 'static; // 能展示，并发安全，全局可见的类型值 /// Wrap the error value with additional context that is evaluated lazily /// only once an error does occur. ...