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$ nix-shell https://github.com/NixOS/nixpkgs/archive/941b4b8f048a383366e24c12022e99c87db09db6.tar.gz -A python39Packages.twisted
Sourcing python-remove-tests-dir-hook
Sourcing python-catch-conflicts-hook.sh
Sourcing python-remove-bin-bytecode-hook.sh
Sourcing setuptools-build-hook
Using setuptoolsBuildPhase
Using setuptoolsShellHook
Sourcing pip-install-hook
Using pipInstallPhase
Sourcing python-imports-check-hook.sh

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{ config, pkgs, ... }:
{
  imports =
    [ 
      ./hardware-configuration.nix
    ];
  nixpkgs.config = {
	  allowUnfree = true;
	  packageOverrides = pkgs: {
	    unstable = import <nixos-unstable> {

polachok

Что такое future?

Future это тип, для которого имплементирован трейт Future

Кто вызывает poll()?

Executor. Это может быть ивент-луп, тред пул или что-то еще.

polachok

```

#[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Serialize, Deserialize, Hash)]
pub struct Time {
    // utc timestamp
    timestamp: i64,
    // timezone offset
    offset: i32,
}

polachok

$ cat test.go
package main
import "os/user"

func main() {
    _, _ = user.Current()
}

$ go build test.go
$ gdb ./test 

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struct FramedTransport<T, C> where T: AsyncRead + AsyncWrite + 'static {
    inner: length_delimited::Framed<T>,
    codec: C,
}

fn framed_delimited<T, C>(framed: length_delimited::Framed<T>, codec: C) -> FramedTransport<T, C>
    where T: AsyncRead + AsyncWrite, C: codec::Encoder + codec::Decoder
 {
    FramedTransport{ inner: framed, codec: codec }
}

polachok

vendor_id       : GenuineIntel
cpu family      : 6
model           : 63
model name      : Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz
stepping        : 2
microcode       : 0x2e
cpu MHz         : 3040.039
cache size      : 30720 KB
physical id     : 0
siblings        : 24

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          _____                    _____                    _____
         /\    \                  /\    \                  /\    \
        /::\____\                /::\____\                /::\    \
       /:::/    /               /:::/    /               /::::\    \
      /:::/    /               /:::/    /               /::::::\    \
     /:::/    /               /:::/    /               /:::/\:::\    \
    /:::/____/               /:::/    /               /:::/__\:::\    \
   /::::\    \              /:::/    /               /::::\   \:::\    \
  /::::::\    \   _____    /:::/    /      _____    /::::::\   \:::\    \
 /:::/\:::\    \ /\    \  /:::/____/      /\    \  /:::/\:::\   \:::\ ___\

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impl AmqpClient {
  fn call(&mut self, Request::Channel::Open) -> Future<Channel, AmqpError>
}

impl Channel {
  fn declare_queue(&mut self, name: AsRef<str>) -> Future<Queue, AmqpError>
}

impl Queue {
  fn consume(&mut self) -> Future<MessageStream, AmqpError>

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[/tmp]% cat test.txt 
0
[/tmp]% cat test.php 
<?php>
$file = fopen("test.txt", "r");
$buf = '';
while ($buf = fread($file, 1)) {
        echo("inside\n");
}
echo("outside\n");