~/Using RWMutex in Golang for Concurrent Read Write

Mar 10, 2021

Use RWMutex in Golang to manage concurrent access. RWMutex allows multiple readers but only one writer, boosting performance for situations with more reads than writes. It is part of the sync package.

To use:

• Call RLock for readers and RUnlock to release.
• Call Lock for writers and Unlock to release.

Example:

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import (
    "sync"
)

var rw sync.RWMutex
var value int

func read() int {
    rw.RLock()
    defer rw.RUnlock()
    return value
}

func write(val int) {
    rw.Lock()
    value = val
    rw.Unlock()
}

Key details:

• Multiple RLocks can hold the lock at once, but Lock requires exclusive access.
• Writers block readers and readers block writers.
• Use defer to ensure unlocking even if a panic occurs.

For more, read official RWMutex docs.