The context mechanism in the Go language is a standard way to pass context information between multiple Goroutines. In concurrent programming, it is often necessary to share some data or state in multiple Goroutines, but sharing data directly can lead to problems such as race conditions. Therefore, the context mechanism provides a more secure and controllable way to pass context information.
The context mechanism defines the context. The Context type, which is a context interface type that defines methods to set, get, and cancel context information. Create a context in one Goroutine and pass it to other Goroutines, which can use this context to get information such as the timeout of the request, the deadline of the request, and so on.
The context mechanism supports chained calls, that is, when a Goroutine creates a context, a new context can be created using methods such as WithCancel(), WithTimeout(), etc. This new context will contain some new information, such as a cancellation signal or a timeout. When Goroutine completes a task or times out, it can use the cancel() method to cancel the context, so that other Goroutines can detect that the context has been canceled and thus avoid continuing with useless operations.
In summary, the context mechanism provides a convenient and secure way to pass context information between Goroutines. It helps us avoid race conditions, improve the readability and maintainability of our code, and make our concurrent programs more robust.
