How Are Goroutine Arguments and Values Evaluated in Go?

How Goroutine Evaluation Works in Go

In Go, when the go keyword is used, the function's arguments and value are evaluated in the main goroutine, where the go statement is executed. This concept is illustrated in the context of a concurrency echo server in Chapter 8 of "The Go Programming Language."

The rationale behind this evaluation mechanism in the main goroutine stems from the nature of goroutines. A goroutine is a lightweight thread that executes concurrently with the main goroutine. When the go statement is executed, it starts a new goroutine that runs the specified function independently.

The arguments passed to the function and its value are evaluated as part of the go statement. This ensures that the function has the necessary data before the goroutine is started. If the function arguments were evaluated within the goroutine, the values might be different from those intended at the time of invoking the function.

For example, a function may expect a variable to have a certain value when the go statement is executed. However, if the variable's value is modified after the go statement is executed but before the goroutine runs, the function might operate on outdated data.

Evaluating the arguments and value in the main goroutine ensures consistency between the intended input at the time of the go statement and the actual input when the goroutine executes. This mechanism is crucial for maintaining data integrity and correctness in concurrent programs.

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