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goutil/sync/locker.go

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2024-12-04 18:02:54 -07:00
package usync
import "sync"
// Locker guards access to a value
type Locker[T any] struct {
value T
mutex sync.Mutex
}
// NewLocker creates a new locker with the specified value.
func NewLocker[T any] (value T) Locker[T] {
return Locker[T] {
value: value,
}
}
// Set sets the value of the locker.
func (this *Locker[T]) Set (value T) {
this.mutex.Lock()
defer this.mutex.Unlock()
this.value = value
}
// Borrow borrows the value from the locker, and returns a function that must
// immediately be deferred, like this:
//
// value, done := locker.Borrow()
// defer done()
//
// From the time Borrow is called to the time the done function is called, it is
// safe to access the locked object from within the current goroutine.
func (this *Locker[T]) Borrow () (T, func ()) {
this.mutex.Lock()
return this.value, this.mutex.Unlock
}