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diff --git a/website/manual.md b/website/manual.md index 524f1d449..ea6f21719 100644 --- a/website/manual.md +++ b/website/manual.md @@ -532,6 +532,44 @@ Particularly useful ones: ## Internal details +### Deno and Linux analogy + +| **Linux** | **Deno** | +| ------------------------------: | :------------------------------- | +| Processes | Web Workers | +| Syscalls | Ops | +| File descriptors (fd) | [Resource ids (rid)](#resources) | +| Scheduler | Tokio | +| Userland: libc++ / glib / boost | deno_std | +| /proc/\$\$/stat | [deno.metrics()](#metrics) | +| man pages | deno --types | + +#### Resources + +Resources (AKA `rid`) are Deno's version of file descriptors. They are integer +values used to refer to open files, sockets, and other concepts. For testing it +would be good to be able to query the system for how many open resources there +are. + +```ts +import { resources, close } from "deno"; +console.log(resources()); +// output like: { 0: "stdin", 1: "stdout", 2: "stderr", 3: "repl" } + +// close resource by rid +close(3); +``` + +#### Metrics + +Metrics is deno's internal counters for various statics. + +```ts +import { metrics } from "deno"; +console.log(metrics()); +// output like: { opsDispatched: 1, opsCompleted: 1, bytesSentControl: 40, bytesSentData: 0, bytesReceived: 176 } +``` + ### Schematic diagram <img src="schematic_v0.2.png"> |