How Can I Access Return Values from Go Goroutines?

Return Value Propagation in Go Goroutines

Background:

Go routines are lightweight threads that execute concurrently in a Go program. When a goroutine is created, it runs a designated function and may return a value.

Question:

What happens to return values from goroutines? Can these values be captured or used in the parent routine that initiated the goroutine?

Answer:

In the provided example, the getNumber function has a return value i that is stored on the stack. This behavior indicates that goroutines maintain their own stack for variables.

However, despite this storage, return values from goroutines cannot be retrieved or used outside the goroutine itself. This is because goroutines execute in their own unique stack, which is distinct from the stack of the main routine. When the goroutine completes, its stack is destroyed, and the return value along with any local variables are lost.

Conclusion:

Return values from goroutines are not accessible outside the goroutine in which they are defined. Consequently, it is generally advisable to avoid returning values from goroutines and instead use alternative mechanisms for inter-routine communication, such as channels or shared memory.

The above is the detailed content of How Can I Access Return Values from Go Goroutines?. For more information, please follow other related articles on the PHP Chinese website!