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This article will explain in detail what is mutex in the Go language, and the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

1. Mutex Mutex

1.1 introduction to Mutex

The synchronization tools of the Go language are mainly provided by the sync package. Mutex (Mutex) and read-write lock (RWMutex) are the methods in the sync package.

Mutexes can be used to protect a critical region, ensuring that only one goroutine is in the critical zone at a time. It mainly includes two operations: locking (Lock method) and unlocking (Unlock method). Firstly, the goroutine entering the critical area is locked and unlocked when it leaves.

Note the following when using mutexes (Mutex):

Do not lock the mutex repeatedly, otherwise it will block and may lead to a deadlock (deadlock)

To unlock the mutex, this is also to avoid repeated locking

Do not unlock mutexes that are unlocked or unlocked

Do not pass a mutex directly between multiple functions. The sync.Mutex type belongs to a value type. When you pass it to a function, it will produce a copy. The operation on the lock in the function will not affect the original lock.

In short, a mutex is only used to protect a critical area, and remember to unlock it after locking. For each locking operation, there must be one and only one corresponding unlocking operation, that is, locking and unlocking should occur in pairs, and the safest way is to use defer statement to unlock.

1.2 Mutex usage examples

The following code simulates withdrawing and saving operations:

Package mainimport ("flag"fmt"sync") var (mutex sync.Mutex balance int protecting uint / / whether to lock sign = make (chan struct {}, 10) / / Channel to wait for all goroutine) / / Save func deposit (value int) {defer func () {sign

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