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