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Concurrency limit test
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| package main | |
| import ( | |
| "fmt" | |
| "sync" | |
| "time" | |
| ) | |
| func spawn(fn func(), count int, limit int) { | |
| limiter := make(chan bool, limit) | |
| spawned := func() { | |
| defer func() { <-limiter }() | |
| fn() | |
| } | |
| go func() { | |
| for i := 0; i < count; i++ { | |
| limiter <- true | |
| go spawned() | |
| } | |
| }() | |
| } | |
| func main() { | |
| count := 10 | |
| limit := 3 | |
| var wg sync.WaitGroup | |
| wg.Add(count) | |
| concurrentCount := 0 | |
| failed := false | |
| var mock = func() { | |
| defer func() { | |
| wg.Done() | |
| concurrentCount-- | |
| }() | |
| concurrentCount++ | |
| if concurrentCount > limit { | |
| failed = true | |
| } | |
| time.Sleep(100) | |
| } | |
| spawn(mock, count, limit) | |
| wg.Wait() | |
| if failed { | |
| fmt.Println("Test failed"); | |
| } else { | |
| fmt.Println("Test passed"); | |
| } | |
| } |
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