kacerrandClaude Fable 5
7219eb5a23
Includes solved 02-worker-pool and 09-safe-counter (mutex, atomic, sharded). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GbnJj9ZqEx9nUvzkjdwfMq
33 lines
675 B
Go
33 lines
675 B
Go
// SPOT THE LEAK. Run it — it prints goroutine counts. Explain why the number
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// grows, then fix it with a one-character-ish change.
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package main
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import (
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"errors"
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"fmt"
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"runtime"
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"time"
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)
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func fetch() (string, error) {
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ch := make(chan string)
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go func() {
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time.Sleep(50 * time.Millisecond) // pretend slow upstream
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ch <- "body"
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}()
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select {
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case body := <-ch:
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return body, nil
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case <-time.After(10 * time.Millisecond): // timeout fires first
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return "", errors.New("timeout")
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}
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}
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func main() {
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for i := 0; i < 100; i++ {
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fetch()
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}
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time.Sleep(200 * time.Millisecond)
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fmt.Println("goroutines still alive:", runtime.NumGoroutine()) // expected: 1
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}
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