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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package sync

// Export for testing.
var Runtime_Semacquire = runtime_Semacquire
var Runtime_Semrelease = runtime_Semrelease
var Runtime_procPin = runtime_procPin
var Runtime_procUnpin = runtime_procUnpin

// poolDequeue testing.
type PoolDequeue interface {
	PushHead(val any) bool
	PopHead() (any, bool)
	PopTail() (any, bool)
}

func NewPoolDequeue(n int) PoolDequeue {
	d := &poolDequeue{
		vals: make([]eface, n),
	}
	// For testing purposes, set the head and tail indexes close
	// to wrapping around.
	d.headTail.Store(d.pack(1<<dequeueBits-500, 1<<dequeueBits-500))
	return d
}

func (d *poolDequeue) PushHead(val any) bool {
	return d.pushHead(val)
}

func (d *poolDequeue) PopHead() (any, bool) {
	return d.popHead()
}

func (d *poolDequeue) PopTail() (any, bool) {
	return d.popTail()
}

func NewPoolChain() PoolDequeue {
	return new(poolChain)
}

func (c *poolChain) PushHead(val any) bool {
	c.pushHead(val)
	return true
}

func (c *poolChain) PopHead() (any, bool) {
	return c.popHead()
}

func (c *poolChain) PopTail() (any, bool) {
	return c.popTail()
}