各大语言的异同步 协程
go
type Job struct {
id int
randomno int
}
type Result struct {
job Job
sumofdigits int
}
var jobs = make(chan Job, 10)
var results = make(chan Result, 10)
func digits(number int) int {
sum := 0
no := number
for no != 0 {
digit := no % 10
sum += digit
no /= 10
}
time.Sleep(2 * time.Second)
return sum
}
func worker(wg *sync.WaitGroup) {
for job := range jobs {
output := Result{job, digits(job.randomno)}
results <- output
}
wg.Done()
}
func createWorkerPool(noOfWorkers int) {
var wg sync.WaitGroup
for i := 0; i < noOfWorkers; i++ {
wg.Add(1)
go worker(&wg)
}
wg.Wait()
close(results)
}
func allocateJob(noOfJobs int) {
for i := 0; i < noOfJobs; i++ {
randomno := rand.Intn(999)
job := Job{i, randomno}
jobs <- job
}
close(jobs)
}
func result(done chan bool) {
for result := range results {
fmt.Printf("Job id %d, input random no %d , sum of digits %d\n", result.job.id, result.job.randomno, result.sumofdigits)
}
done <- true
}
func TestDemo(t *testing.T) {
startTime := time.Now()
go allocateJob(100)
done := make(chan bool)
go result(done)
createWorkerPool(10)
<-done
endTime := time.Now()
diff := endTime.Sub(startTime)
fmt.Println("total time taken ", diff.Seconds(), "seconds")
}
Kotlin
import kotlinx.coroutines.*
fun main() = runBlocking {
launch { doWorld() }
println("Hello,")
}
// 这是你的第一个挂起函数
suspend fun doWorld() {
delay(1000L)
println("World!")
}
Swift
static func getImageData(url: String) async throws -> Data{
try await AF.request(url).responseDataAsync() // 调用异步函数，挂起等待结果
}
C++
Dart
void main() async {
// Read some data.
final fileData = await _readFileAsync();
final jsonData = jsonDecode(fileData);
// Use that data.
print('Number of JSON keys: ${jsonData.length}');
}
Future<String> _readFileAsync() async {
final file = File(filename);
final contents = await file.readAsString();
return contents.trim();
}
js
// todo
