Embedded vs. Local vs. Global Mutexes in Go: When to Use Which?

Appropriate Usage of Embedded Mutexes in Go Structures

As discussed in the reference code snippet, embedding a mutex within a struct is commonly encountered. However, the question arises: when is this approach preferred over local or global mutexes?

Embedding Mutexes

If a mutex is intended to protect concurrent access to fields of a struct, it is advantageous to embed the mutex as a field within that struct. This clarifies its purpose and provides a convenient way to access the mutex.

When to Use Embedded Mutexes

• When there is a single instance of the struct that needs protection from concurrent access.
• When multiple instances of the struct need individual protection from concurrent access.

Local Mutexes

Local mutexes are declared within the scope of a function or method. They are used when the mutex protects a specific resource within a limited context.

Global Mutexes

Global mutexes are declared at the package level. They are used when there is only a single resource that needs protection from concurrent access throughout the application.

Choosing the Right Option

The choice between embedding a mutex, using a local mutex, or using a global mutex depends on the specific requirements of the application. Embedded mutexes are convenient and appropriate for protecting individual struct instances. Local mutexes are suitable for protecting specific resources within a limited scope. Global mutexes are needed when only a single resource requires protection from concurrent access across the application.

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