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package mutexes
import "sync"
// WithSafety wrapps the supplied Mutex to protect unlock fns
// from being called multiple times
func WithSafety(mu Mutex) Mutex {
return &safeMutex{mu: mu}
}
// WithSafetyRW wrapps the supplied RWMutex to protect unlock
// fns from being called multiple times
func WithSafetyRW(mu RWMutex) RWMutex {
return &safeRWMutex{mu: mu}
}
// safeMutex simply wraps a Mutex to add multi-unlock safety
type safeMutex struct{ mu Mutex }
func (mu *safeMutex) Lock() func() {
unlock := mu.mu.Lock()
once := sync.Once{}
return func() { once.Do(unlock) }
}
// safeRWMutex simply wraps a RWMutex to add multi-unlock safety
type safeRWMutex struct{ mu RWMutex }
func (mu *safeRWMutex) Lock() func() {
unlock := mu.mu.Lock()
once := sync.Once{}
return func() { once.Do(unlock) }
}
func (mu *safeRWMutex) RLock() func() {
unlock := mu.mu.RLock()
once := sync.Once{}
return func() { once.Do(unlock) }
}
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