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71 lines
1.1 KiB
71 lines
1.1 KiB
package nbconn
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import (
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"sync"
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)
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const minBufferQueueLen = 8
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type bufferQueue struct {
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lock sync.Mutex
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queue []*[]byte
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r, w int
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}
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func (bq *bufferQueue) pushBack(buf *[]byte) {
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bq.lock.Lock()
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defer bq.lock.Unlock()
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if bq.w >= len(bq.queue) {
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bq.growQueue()
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}
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bq.queue[bq.w] = buf
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bq.w++
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}
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func (bq *bufferQueue) pushFront(buf *[]byte) {
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bq.lock.Lock()
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defer bq.lock.Unlock()
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if bq.w >= len(bq.queue) {
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bq.growQueue()
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}
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copy(bq.queue[bq.r+1:bq.w+1], bq.queue[bq.r:bq.w])
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bq.queue[bq.r] = buf
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bq.w++
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}
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func (bq *bufferQueue) popFront() *[]byte {
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bq.lock.Lock()
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defer bq.lock.Unlock()
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if bq.r == bq.w {
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return nil
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}
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buf := bq.queue[bq.r]
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bq.queue[bq.r] = nil // Clear reference so it can be garbage collected.
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bq.r++
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if bq.r == bq.w {
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bq.r = 0
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bq.w = 0
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if len(bq.queue) > minBufferQueueLen {
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bq.queue = make([]*[]byte, minBufferQueueLen)
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}
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}
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return buf
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}
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func (bq *bufferQueue) growQueue() {
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desiredLen := (len(bq.queue) + 1) * 3 / 2
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if desiredLen < minBufferQueueLen {
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desiredLen = minBufferQueueLen
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}
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newQueue := make([]*[]byte, desiredLen)
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copy(newQueue, bq.queue)
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bq.queue = newQueue
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}
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