mirror of
https://github.com/octoleo/syncthing.git
synced 2024-12-25 04:06:03 +00:00
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
|
// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
|
||
|
// All rights reserved. Use of this source code is governed by an MIT-style
|
||
|
// license that can be found in the LICENSE file.
|
||
|
|
||
|
package model
|
||
|
|
||
|
import (
|
||
|
"sync"
|
||
|
|
||
|
"github.com/syncthing/syncthing/internal/protocol"
|
||
|
)
|
||
|
|
||
|
// deviceActivity tracks the number of outstanding requests per device and can
|
||
|
// answer which device is least busy. It is safe for use from multiple
|
||
|
// goroutines.
|
||
|
type deviceActivity struct {
|
||
|
act map[protocol.DeviceID]int
|
||
|
mut sync.Mutex
|
||
|
}
|
||
|
|
||
|
func newDeviceActivity() *deviceActivity {
|
||
|
return &deviceActivity{
|
||
|
act: make(map[protocol.DeviceID]int),
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (m deviceActivity) leastBusy(availability []protocol.DeviceID) protocol.DeviceID {
|
||
|
m.mut.Lock()
|
||
|
var low int = 2<<30 - 1
|
||
|
var selected protocol.DeviceID
|
||
|
for _, device := range availability {
|
||
|
if usage := m.act[device]; usage < low {
|
||
|
low = usage
|
||
|
selected = device
|
||
|
}
|
||
|
}
|
||
|
m.mut.Unlock()
|
||
|
return selected
|
||
|
}
|
||
|
|
||
|
func (m deviceActivity) using(device protocol.DeviceID) {
|
||
|
m.mut.Lock()
|
||
|
defer m.mut.Unlock()
|
||
|
m.act[device]++
|
||
|
}
|
||
|
|
||
|
func (m deviceActivity) done(device protocol.DeviceID) {
|
||
|
m.mut.Lock()
|
||
|
defer m.mut.Unlock()
|
||
|
m.act[device]--
|
||
|
}
|