Is Go\'s `os.File` `Write()` Method Thread-Safe?

Thread Safety of os.File's Write() Method

In the realm of software development, thread safety is crucial to ensure the integrity of multithreaded applications. One common query raised by developers is whether the Write() method of the os.File type in Go is thread-safe.

The Lack of Explicit Thread Safety Documentation

While the Go documentation for os.File provides comprehensive details on its functionality, it does not explicitly mention thread safety for the Write() method. This omission has left developers uncertain about the method's behavior in multithreaded environments.

Go's Thread Safety Conventions

To clarify this uncertainty, it's essential to understand Go's general conventions regarding thread safety. According to convention, no function or method is inherently thread-safe unless explicitly stated or evident from the context. This convention also applies to the Write() method of os.File.

The Mandatory Use of External Synchronization

Based on the aforementioned convention, it becomes clear that concurrent writes to an os.File via the Write() method are not thread-safe. To ensure data integrity in such scenarios, developers must implement external synchronization mechanisms, such as mutexes or channels, to prevent race conditions and data corruption.

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