mirror of
https://github.com/syncthing/syncthing.git
synced 2024-11-17 19:08:46 -07:00
56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
// You can obtain one at https://mozilla.org/MPL/2.0/.
|
|
|
|
package model
|
|
|
|
import (
|
|
"github.com/syncthing/syncthing/lib/protocol"
|
|
"github.com/syncthing/syncthing/lib/sync"
|
|
)
|
|
|
|
// 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),
|
|
mut: sync.NewMutex(),
|
|
}
|
|
}
|
|
|
|
func (m *deviceActivity) leastBusy(availability []Availability) (Availability, bool) {
|
|
m.mut.Lock()
|
|
low := 2<<30 - 1
|
|
found := false
|
|
var selected Availability
|
|
for _, info := range availability {
|
|
if usage := m.act[info.ID]; usage < low {
|
|
low = usage
|
|
selected = info
|
|
found = true
|
|
}
|
|
}
|
|
m.mut.Unlock()
|
|
return selected, found
|
|
}
|
|
|
|
func (m *deviceActivity) using(availability Availability) {
|
|
m.mut.Lock()
|
|
m.act[availability.ID]++
|
|
m.mut.Unlock()
|
|
}
|
|
|
|
func (m *deviceActivity) done(availability Availability) {
|
|
m.mut.Lock()
|
|
m.act[availability.ID]--
|
|
m.mut.Unlock()
|
|
}
|