Is log.Println Concurrency-Safe for File Logging in Go?

Concurrency Safety in Golang's File Logging with log.Println

In your code, you utilize log.Println to write logs to a file. You inquire whether concurrent access to the log file is adequately handled by log.Println or whether a channel is necessary for synchronization.

Concurrency Safety

The Output function in the log package serves as the primary output method for logging functionalities. It acquires a mutex lock before performing its operations. This implies that only one goroutine can access the log file at any given moment, ensuring concurrency safety.

Buffering

The log package inherently supports buffering. By default, the package buffers log messages until either the buffer is full or the log.Flush method is explicitly called. This buffering mechanism minimizes the number of file system writes, optimizing performance.

Conclusion

Based on the analysis of the log.go implementation and its use of mutexes, we can confidently assert that log.Println is concurrency-safe. Consequently, you can utilize log.Println to write to a file concurrently without the need for additional synchronization mechanisms like channels. The log package's buffering capability further enhances performance by reducing file system writes.

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