How to Avoid Deadlock When Gathering Results from Goroutines into a Slice?

Gathering Results from Goroutines into a Slice

Utilizing goroutines to concurrently process data and gather results can be challenging, especially when managing concurrency and thread safety. In your code, you encountered a deadlock error due to the waitgroup being signaled to wait for all goroutines to finish before collecting results.

To resolve this issue, we need to asynchronously close the results channel after all goroutines have completed their tasks. Here's a modified version of your code:

for i, line := range contents {
    wg.Add(1)
    go newSample(line, *replicatePtr, *timePtr, sampleChan, &wg)
}

go func() {
    wg.Wait()
    close(sampleChan)
}()

for s := range sampleChan {
    // Process results
}

This change ensures that the results channel is closed when all goroutines have finished, enabling us to gather the results correctly.

Additionally, for enhanced code clarity and testability, it's recommended to refactor newSample to be a synchronous function that generates results rather than taking the waitgroup and channel. This allows for cleaner separation of concurrency concerns and easier testing.

By implementing these adjustments, you can efficiently gather results from your goroutines and avoid deadlock errors.

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