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.
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