Shulou(Shulou.com)06/01 Report--

This article and you understand what the redis source code is what language, there is a certain reference value, friends in need can refer to, hope to help you.

Redis source code is ANSI C language, first of all, of course, you should start with the main function. But when we read it, we should grasp the main line, that is, how the code is executed step by step when we type a command into Redis.

In this way, we can first observe from the outside, try to execute some commands, and then drill in to see how the corresponding source code is implemented after understanding the external performance of these commands. To understand this code, we first need to understand the event mechanism of Redis.

Moreover, once we understand the mechanism of Redis's event loop (Event Loop), we will understand an interesting question: why does Redis execute in a single thread but can handle multiple requests at the same time? (of course, strictly speaking, Redis does not have only one thread, but apart from the main thread, Redis's other threads only play an auxiliary role. They are threads that run in the background to do asynchronous time-consuming tasks.)

Starting with the main function and following the code execution path, we can actually chase it all the time. Let's limit the scope.

Start with the main function, trace it step by step, and finally reach the execution entry of any Redis command. Or you can do the rest of the exploration yourself.

Overview of initialization process and event cycle

The main function of the Redis source code is in the source file server.c. The logic after the main function starts execution can be divided into two phases:

Various initializations (including initialization of event loops)

Execute the event loop.

These two execution phases can be expressed in the following flowchart (click to see the larger picture)

After reading the content of the appeal, do you have a general understanding of the language of redis source code? If you want to know more, welcome to follow the industry information channel!

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