freelists.go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package fuse

// #include <cfreelist.h>
import "C"

import (
	"unsafe"

	"github.com/jcxue/fuse/internal/buffer"
)

////////////////////////////////////////////////////////////////////////
// buffer.InMessage
////////////////////////////////////////////////////////////////////////

// LOCKS_EXCLUDED(c.mu)
func (c *Connection) getInMessage() (x *buffer.InMessage) {
	// c.mu.Lock()
	// x = (*buffer.InMessage)(c.inMessages.Get("IN"))
	// c.mu.Unlock()

	// if x == nil {
	// 	x = new(buffer.InMessage)
	// }

	if c.cfreeList != nil {
		c.mu.Lock()
		x = (*buffer.InMessage)(unsafe.Pointer(C.GetMessage(c.cfreeList)))
		c.mu.Unlock()
	} else {
		c.mu.Lock()
		x = (*buffer.InMessage)(c.inMessages.Get("IN"))
		c.mu.Unlock()

		if x == nil {
			x = new(buffer.InMessage)
		}
	}

	return
}

// LOCKS_EXCLUDED(c.mu)
func (c *Connection) putInMessage(x *buffer.InMessage) {
	// c.mu.Lock()
	// c.inMessages.Put(unsafe.Pointer(x), "IN")
	// c.mu.Unlock()
	if c.cfreeList != nil {
		c.mu.Lock()
		C.PutMessage(c.cfreeList, (*C.uint8_t)(unsafe.Pointer(x)))
		c.mu.Unlock()
	} else {
		c.mu.Lock()
		c.inMessages.Put(unsafe.Pointer(x), "IN")
		c.mu.Unlock()
	}

}

////////////////////////////////////////////////////////////////////////
// buffer.OutMessage
////////////////////////////////////////////////////////////////////////

// LOCKS_EXCLUDED(c.mu)
func (c *Connection) getOutMessage() (x *buffer.OutMessage) {
	// c.mu.Lock()
	// x = (*buffer.OutMessage)(c.outMessages.Get("OUT"))
	// c.mu.Unlock()

	// if x == nil {
	// 	x = new(buffer.OutMessage)
	// }
	if c.cfreeList != nil {
		c.mu.Lock()
		x = (*buffer.OutMessage)(unsafe.Pointer(C.GetMessage(c.cfreeList)))
		c.mu.Unlock()
	} else {
		c.mu.Lock()
		x = (*buffer.OutMessage)(c.outMessages.Get("OUT"))
		c.mu.Unlock()

		if x == nil {
			x = new(buffer.OutMessage)
		}
	}

	x.Reset()

	return
}

// LOCKS_EXCLUDED(c.mu)
func (c *Connection) putOutMessage(x *buffer.OutMessage) {
	// c.mu.Lock()
	// c.outMessages.Put(unsafe.Pointer(x), "OUT")
	// c.mu.Unlock()
	if c.cfreeList != nil {
		c.mu.Lock()
		C.PutMessage(c.cfreeList, (*C.uint8_t)(unsafe.Pointer(x)))
		c.mu.Unlock()
	} else {
		c.mu.Lock()
		c.outMessages.Put(unsafe.Pointer(x), "OUT")
		c.mu.Unlock()
	}
}