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64 lines
2.6 KiB
Markdown
64 lines
2.6 KiB
Markdown
## Internal details
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### Deno and Linux analogy
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| **Linux** | **Deno** |
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| ------------------------------: | :------------------------------------------- |
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| Processes | Web Workers |
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| Syscalls | Ops |
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| File descriptors (fd) | [Resource ids (rid)](architecture#resources) |
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| Scheduler | Tokio |
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| Userland: libc++ / glib / boost | https://deno.land/std/ |
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| /proc/\$\$/stat | [Deno.metrics()](architecture#metrics) |
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| man pages | deno types |
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#### Resources
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Resources (AKA `rid`) are Deno's version of file descriptors. They are integer
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values used to refer to open files, sockets, and other concepts. For testing it
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would be good to be able to query the system for how many open resources there
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are.
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```ts
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console.log(Deno.resources());
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// { 0: "stdin", 1: "stdout", 2: "stderr" }
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Deno.close(0);
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console.log(Deno.resources());
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// { 1: "stdout", 2: "stderr" }
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```
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#### Metrics
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Metrics is Deno's internal counter for various statistics.
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```shell
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> console.table(Deno.metrics())
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┌─────────────────────────┬───────────┐
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│ (idx) │ Values │
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├─────────────────────────┼───────────┤
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│ opsDispatched │ 9 │
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│ opsDispatchedSync │ 0 │
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│ opsDispatchedAsync │ 0 │
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│ opsDispatchedAsyncUnref │ 0 │
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│ opsCompleted │ 9 │
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│ opsCompletedSync │ 0 │
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│ opsCompletedAsync │ 0 │
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│ opsCompletedAsyncUnref │ 0 │
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│ bytesSentControl │ 504 │
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│ bytesSentData │ 0 │
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│ bytesReceived │ 856 │
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└─────────────────────────┴───────────┘
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```
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### Schematic diagram
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### Conference
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- Ryan Dahl. (May 27, 2020).
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[An interesting case with Deno](https://www.youtube.com/watch?v=1b7FoBwxc7E).
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Deno Israel.
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- Bartek Iwańczuk. (Oct 6, 2020).
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[Deno internals - how modern JS/TS runtime is
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built](https://www.youtube.com/watch?v=AOvg_GbnsbA&t=35m13s). Paris Deno.
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