Is Concurrent Printing to stdout from Multiple Goroutines Safe in Go?

Is it Safe for Multiple Goroutines to Simultaneously Print to stdout?

When using multiple goroutines in a Go program, you may wonder if it's safe to print to standard output (stdout) without synchronization.

Answer:

No, it's not considered safe for multiple goroutines to print to stdout concurrently. Although you may occasionally encounter no visible issues, it's not guaranteed that each output line will appear separately without data corruption.

The fmt package, used for formatting and printing, prioritizes safety. As a result, it attempts to mitigate the risk of intermingled output, but it does not guarantee complete protection against process crashes.

Explanation:

Go's documentation consistently emphasizes that accessing shared resources concurrently is inherently unsafe unless explicitly stated otherwise. This principle applies to printing to stdout as well.

Alternative Solution:

For safe and concurrent printing, consider using the log package. With a simple initial setup, you can access a subset of the fmt.Print* functionality while ensuring thread safety.

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