Why Use an Empty `select{}` Statement for Blocking in Go?

Understanding the Purpose of an Empty Select Statement in Go

When exploring the net/http/httptest package, one might encounter an empty select{} statement, raising questions about its functionality. Let's delve deeper into this construct to comprehend its purpose.

An empty select{} statement in Go acts as a blocking operation, effectively pausing program execution indefinitely. Its behavior is akin to an empty for{} loop. On most Go architectures, this statement yields CPU resources, allowing other processes to execute while the current thread is idle.

In contrast, an empty for-loop consumes CPU, causing the program to run at full capacity. By utilizing an empty select statement, one can prevent unnecessary CPU consumption while maintaining a blocking state, similar to the behavior of an infinite for loop.

This understanding clarifies the purpose of the select{} statement in the given code snippet. If the serve argument is not empty, the program enters a blocking state to maintain the server's availability. The empty select statement ensures that the process remains responsive to the user's request while conserving system resources.

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