Rwmutex
An RWMutex is a synchronization primitive that permits concurrent readers while allowing only one writer and excluding conflicting access.
Learn Concurrent Programming with Go
sync.RWMutex is Go's standard mutual-exclusion type that provides both exclusive locking and shared reader locking.
- How it is used
- Coordinates concurrent reads and exclusive updates of shared resources in read-heavy goroutine-based applications.
- How deep it goes
- Defines read/write behavior, lists the API, and demonstrates lock placement around shared-slice operations.
- Examples
- Uses a basketball match recorder, client handlers, a shared match-events slice, and a multicore performance comparison.
- What you can do after
- Apply it via sync.RWMutex to protect read-heavy shared state with concurrent readers and exclusive writers.
Read how Learn Concurrent Programming with Go explains rwmutex →
100 Go Mistakes and How to Avoid Them
sync.RWMutex is a Go standard-library type that provides mutual exclusion with separate read and write locking modes.
- How it is used
- Protects concurrent reads and writes to shared maps, slices, and object fields through separate read and write locking modes.
- How deep it goes
- Explains lock-scope choices, map and slice aliasing, race consequences, and recursive-lock deadlocks without descending into implementation internals.
- Examples
- Uses a customer-balance cache, shared map and slice assignments, and a Customer whose error formatting recursively requests a read lock.
- What you can do after
- Diagnose/debug with the race detector, identify unsafe aliases and recursive locking, and select whole-operation locking or defensive copying.
Read how 100 Go Mistakes and How to Avoid Them explains rwmutex →
Go by Example
RWMutex is a Go synchronization type that permits concurrent read access while allowing only one writer at a time.
- How it is used
- Protects shared application state in read-heavy concurrent services.
- How deep it goes
- Defines read and write access modes, demonstrates map protection, and defers performance choice to benchmarking.
- Examples
- Uses a concurrent link shortener whose in-memory map supports Shorten writes and Resolve reads.
- What you can do after
- Apply it via Go's sync.RWMutex to protect shared maps and other read-heavy state from unsafe concurrent use.
Learn Go with Pocket-Sized Projects
sync.RWMutex is Go's synchronization type that permits concurrent readers while excluding writers.
- How it is used
- Protects shared resources such as a cache while permitting concurrent reads.
- How deep it goes
- Defines read and write locking, applies each method to a cache, and defers performance validation to benchmarking.
- Examples
- Uses a generic cache with Read, Upsert, and Delete methods as the concrete synchronization example.
- What you can do after
- Apply it to a cache and verify the synchronization with go test -race . and targeted benchmarks.
Read how Learn Go with Pocket-Sized Projects explains rwmutex →
Related concepts
- rwlockimplements · An RwLock is a synchronization primitive that permits multiple concurrent readers or one exclusive writer for protected data.
- lockinguses · Locking is a synchronization technique that restricts concurrent access to shared resources or protected operations.
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