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50 lines
1.8 KiB
Markdown
50 lines
1.8 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)](#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()](#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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const { resources, close } = Deno;
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console.log(resources());
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// { 0: "stdin", 1: "stdout", 2: "stderr" }
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close(0);
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console.log(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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│ (index) │ Values │
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├──────────────────┼────────┤
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│ opsDispatched │ 9 │
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│ opsCompleted │ 9 │
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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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