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This article mainly shows you "how to share storage in Linux". The content is easy to understand and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to share storage in Linux".

Core concept

A process is a running program, and each process has its own address space, which consists of memory addresses that the process is allowed to access. A process has one or more threads of execution, and a thread is a collection of execution instructions: a single-threaded process has only one thread, while a multithreaded process has multiple threads. Threads in a process share various resources, especially the address space. In addition, threads in a process can communicate directly through shared memory, although some modern languages such as Go encourage a more orderly approach, such as the use of thread-safe channels. Of course, for different processes, they cannot share memory by default.

There are several ways to start the process that you want to communicate after, and the following examples mainly use the following two methods:

One terminal is used to start one process, and another different terminal is used to start another.

Call the system function fork in one process (parent process) to generate another process (child process).

The above method of using terminal is used in the examples. The ZIP package for these code examples can be downloaded from my website.

Share a file

Programmers should be familiar with file access, including many holes (non-existent files, file permission corruption, etc.), which plague the program's use of files. Nevertheless, file sharing is probably the most basic IPC mechanism. Consider the following relatively simple example where one process (producer producer) creates and writes a file, and then another process (consumer consumer) reads from the same file:

Writes +-+ readsproducer- > | disk file |

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