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worker/types/worker: make ID allocation atomic

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Message IDs are allocated for both messages from UI to workers and the other
way around. Hence, the global nextId variable is accessed from multiple
goroutines.

Instead, use atomic to access the global counter.
This commit is contained in:
Simon Ser 2019-05-19 09:50:19 +00:00 committed by Drew DeVault
parent 34dd6bc635
commit f27db33305
2 changed files with 11 additions and 10 deletions
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10
worker/types/messages.go
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@ -12,13 +12,13 @@ import (
type WorkerMessage interface {
InResponseTo() WorkerMessage
getId() int
setId(id int)
getId() int64
setId(id int64)
}
type Message struct {
inResponseTo WorkerMessage
id int
id int64
}
func RespondTo(msg WorkerMessage) Message {
@ -31,11 +31,11 @@ func (m Message) InResponseTo() WorkerMessage {
return m.inResponseTo
}
func (m Message) getId() int {
func (m Message) getId() int64 {
return m.id
}
func (m Message) setId(id int) {
func (m Message) setId(id int64) {
m.id = id
}

11
worker/types/worker.go
View file

@ -3,9 +3,10 @@ package types
import (
"log"
"sync"
"sync/atomic"
)
var nextId int = 1
var lastId int64 = 1 // access via atomic
type Backend interface {
Run()
@ -17,7 +18,7 @@ type Worker struct {
Messages chan WorkerMessage
Logger *log.Logger
callbacks map[int]func(msg WorkerMessage) // protected by mutex
callbacks map[int64]func(msg WorkerMessage) // protected by mutex
mutex sync.Mutex
}
@ -26,13 +27,13 @@ func NewWorker(logger *log.Logger) *Worker {
Actions: make(chan WorkerMessage, 50),
Messages: make(chan WorkerMessage, 50),
Logger: logger,
callbacks: make(map[int]func(msg WorkerMessage)),
callbacks: make(map[int64]func(msg WorkerMessage)),
}
}
func (worker *Worker) setId(msg WorkerMessage) {
msg.setId(nextId)
nextId++
id := atomic.AddInt64(&lastId, 1)
msg.setId(id)
}
func (worker *Worker) setCallback(msg WorkerMessage,