Here are a few title options, following your requirements: * Is Concurrent Writing to `stdout` in Go Thread-Safe? * Understanding Concurrency Issues with `stdout` in Go: Are `fmt.Fprint` Calls Atomi

Thread Safety of Concurrent Writes to stdout

Concurrent writes to standard output can lead to unpredictable behavior and potential concurrency issues. The key to understanding the safety of such writes lies in the semantics of io.Writer implementations.

The fmt functions in the Go standard library delegate writing to an underlying io.Writer. These functions are threadsafe by themselves, but they do not dictate the behavior of the target io.Writer.

In the case of os.Stdout, which is typically associated with the system's standard output, the semantics of concurrent Write calls depend on the underlying operating system.

POSIX-compliant systems guarantee that writes to regular files or symbolic links are atomic with respect to each other. However, for other types of file descriptors, such as terminals or pipes, the behavior may vary. Some operating systems may interleave data from concurrent Write calls, while others may fail or drop data.

The Go standard library does not provide any guarantees regarding the number of Write calls made by fmt functions. This means that multiple concurrent fmt.Fprint calls writing to the same io.Writer can result in intermixed data, even on systems where individual Write calls are atomic.

Recommendations:

• To prevent data races, serialize concurrent writes to os.Stdout. This can be achieved using a lock or by using the log package, which provides synchronized logging.
• Be aware that the order of printed data may be unpredictable in the case of concurrent Write calls to os.Stdout.
• Consult the documentation of the target operating system to understand the semantics of concurrent writes to file descriptors or other io.Writer implementations.

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