https://github.com/rnons/fork-aff-issue

https://github.com/rnons/fork-aff-issue

Last synced: 4 months ago
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• Host: GitHub
• URL: https://github.com/rnons/fork-aff-issue
• Owner: rnons
• Created: 2019-10-14T07:28:31.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-10-14T07:35:45.000Z (over 6 years ago)
• Last Synced: 2025-07-05T08:43:21.327Z (12 months ago)
• Language: Dhall
• Size: 2.93 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
## Dev

```

spago build

spago run

```

## The code

```purescript

  traceM "hanlder start"

  void $ Aff.forkAff $ do

    -- output is differnt with / without Aff.delay

    -- Aff.delay $ Aff.Milliseconds 0.0

    traceM "fork start"

    buffer <- liftEffect $ ChildProcess.execSync

      "echo fork running"

      ChildProcess.defaultExecSyncOptions

    liftEffect $ Buffer.toString UTF8 buffer >>= \msg ->

      traceM msg

  traceM "hanlder finish"

```

## The output

Without `Aff.delay`, I get

```

'hanlder start'

'fork start'

'fork running\n'

'hanlder finish'

```

With `Aff.delay`, I get

```

'hanlder start'

'hanlder finish'

'fork start'

'fork running\n'

```

This is the desired behavior, however, not sure why `Aff.delay 0` is needed.