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package mutexes
// pool is a very simply memory pool.
type pool struct {
current []interface{}
victim []interface{}
alloc func() interface{}
}
// Acquire will returns a sync.RWMutex from pool (or alloc new).
func (p *pool) Acquire() interface{} {
// First try the current queue
if l := len(p.current) - 1; l >= 0 {
v := p.current[l]
p.current = p.current[:l]
return v
}
// Next try the victim queue.
if l := len(p.victim) - 1; l >= 0 {
v := p.victim[l]
p.victim = p.victim[:l]
return v
}
// Lastly, alloc new.
return p.alloc()
}
// Release places a sync.RWMutex back in the pool.
func (p *pool) Release(v interface{}) {
p.current = append(p.current, v)
}
// GC will clear out unused entries from the pool.
func (p *pool) GC() {
current := p.current
p.current = nil
p.victim = current
}
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