Synchronization is crucial when multiple threads (go-routines in Go) need to access and modify shared memory. A synchronization mechanism prevents race conditions and data inconsistency. In Go, the sync and atomic packages offer various locking primitives for this purpose.
RWMutex (read-write mutex) is a synchronization primitive that controls access to shared data. Unlike the standard Mutex, RWMutex allows multiple threads to read the same data concurrently while restricting writing access to one thread at a time.
s.countersLock.RLock(), when called, locks the counters field within the s receiver. This means that other threads can also acquire read locks on counters concurrently without blocking.
s.countersLock.RLock() only locks the counters field, leaving the averages field unlocked. This allows other threads to access and modify the averages field without interference.
RWMutex is a commonly used synchronization mechanism in Go. While channels have their strengths in concurrency management, RWMutex is suitable for protecting shared memory when multiple threads need to concurrently read and occasionally write to the same data.
atomic.AddInt64 is an atomic operation that adds a value to an integer atomically, ensuring that the operation occurs as a single unit. This prevents race conditions and data corruption when updating shared variables.
In this example, the counter is unlocked before the addition operation to allow other threads to access and modify the counter concurrently. If the lock were held until after the addition, it would unnecessarily block other threads trying to increment the counter.
The above is the detailed content of Go's RWMutex: When Should You Use It Over Other Synchronization Primitives?. For more information, please follow other related articles on the PHP Chinese website!
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
