Created
March 13, 2019 10:05
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timeout and synchronization
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| package main | |
| import ( | |
| "context" | |
| "fmt" | |
| "math/rand" | |
| "time" | |
| ) | |
| const timeout = time.Second | |
| const routinesToStart = 10 | |
| var rng = rand.New(rand.NewSource(time.Now().Unix())) | |
| func processDoubleAsync(ctx context.Context, id int) { | |
| go func(ctx context.Context) { | |
| ctx, cancel := context.WithTimeout(ctx, timeout) | |
| defer cancel() | |
| done := make(chan bool) | |
| go func() { | |
| process(ctx, id) | |
| done <- true | |
| }() | |
| select { | |
| case <-ctx.Done(): | |
| fmt.Printf("error: processing timeout - %d\n", id) | |
| break | |
| case <-done: | |
| fmt.Printf("finished processing\n") | |
| return | |
| } | |
| }(ctx) | |
| } | |
| func processAsync(ctx context.Context, id int) { | |
| ctx, cancel := context.WithTimeout(ctx, timeout) | |
| defer cancel() | |
| done := make(chan bool) | |
| go func() { | |
| process(ctx, id) | |
| done <- true | |
| }() | |
| select { | |
| case <-ctx.Done(): | |
| fmt.Printf("error: processing timeout - %d\n", id) | |
| break | |
| case <-done: | |
| fmt.Printf("finished processing\n") | |
| return | |
| } | |
| } | |
| func process(ctx context.Context, id int) { | |
| fmt.Printf("processing %d started...\n", id) | |
| sleepTime := time.Duration(rng.Int31n(2000)) * time.Millisecond | |
| time.Sleep(sleepTime) | |
| fmt.Printf("%d ended after %s\n", id, sleepTime) | |
| } | |
| func main() { | |
| ctx := context.Background() | |
| for i := 0; i < routinesToStart; i++ { | |
| processDoubleAsync(ctx, i) | |
| } | |
| time.Sleep(time.Second * 30) | |
| } |
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