Can Goroutines Write to a net.Conn Object Simultaneously without Data Corruption?

Can Multiple Goroutines Write to a net.Conn Object Simultaneously?

Multiple Goroutines can issue Write calls to a net.Conn object concurrently. This capability is explicitly stated in the net.Conn documentation:

Multiple goroutines may invoke methods on a Conn simultaneously.

Lock in Write Implementation

In the Unix implementation, the conn.Write method acquires a lock to protect the underlying file descriptor. This lock eliminates the potential for partially written bytes when issuing multiple Write calls.

Windows Implementation

The Windows implementation does not use a loop similar to the one in the Unix implementation. Instead, it relies on the WSASend function. The behavior of WSASend guarantees that all bytes are written without the need for a lock.

Implication for Unix Implementation

In the Unix implementation, you can only expect partial writes if the underlying function (e.g., write) returns an error. If no error occurs, all bytes were written successfully.

Equivalent Loop in WSASend

The WSASend function on Windows provides similar guarantees as the loop in the Unix implementation. It ensures that all bytes are written before returning control, eliminating the need for a separate loop.

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