Downloaded 13 times
![Concurrent search
func Google(query string) (results []Result) {
c := make(chan Result)
go func() { c <- Web(query) } ()
go func() { c <- Image(query) } ()
go func() { c <- Video(query) } ()
for i := 0; i < 3; i++ {
result := <-c
results = append(results, result)
}
return
}](https://image.slidesharecdn.com/concurrency-python4k-141118160538-conversion-gate01/85/Concurrency-in-Python4k-25-320.jpg)
![Concurrent search
func Google(query string) (results []Result) {
c := make(chan Result)
go func() { c <- Web(query) } ()
go func() { c <- Image(query) } ()
go func() { c <- Video(query) } ()
for i := 0; i < 3; i++ {
result := <-c
results = append(results, result)
}
return
}](https://image.slidesharecdn.com/concurrency-python4k-141118160538-conversion-gate01/75/Concurrency-in-Python4k-25-2048.jpg)
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Concurrency in Python4k
- 1. PyWAW #42 Concurrency in Python 4k 17 Nov 2014 Rodolfo Carvalho Lead Developer @ Base
- 2.
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- 12. threading multiprocessing Coroutinesvia Enhanced Generators (PEP 342, Python 2.5)
- 13.
- 14. all from Python2.x concurrent.futures ! asyncio (Python 3.4)
- 16.
- 17. Time Work done main func A func B func C func D
- 18.
- 19. Time Work done Process A Process B Channel
- 20. concurrency primitives goroutines channels select
- 21. goroutines func MightTakeLong(){ // ... } MightTakeLong() go MightTakeLong()
- 22. channels // Declaringand initializing c := make(chan int) // Sending on a channel c <- 1 // Receiving from a channel // The "arrow" indicates the direction of data flow value = <-c
- 23. select func fibonacci(c,quit chan int) { x, y := 0, 1 for { select { case c <- x: x, y = y, x+y case <-quit: fmt.Println("quit") return } } } func main() { c := make(chan int) quit := make(chan int) go func() { for i := 0; i < 10; i++ { fmt.Println(<-c) } quit <- 0 }() fibonacci(c, quit) }
- 24.
- 25. Concurrent search funcGoogle(query string) (results []Result) { c := make(chan Result) go func() { c <- Web(query) } () go func() { c <- Image(query) } () go func() { c <- Video(query) } () for i := 0; i < 3; i++ { result := <-c results = append(results, result) } return }
- 26. timeout c :=make(chan Result) go func() { c <- Web(query) } () go func() { c <- Image(query) } () go func() { c <- Video(query) } () timeout := time.After(80 * time.Millisecond) for i := 0; i < 3; i++ { select { case result := <-c: results = append(results, result) case <-timeout: fmt.Println("timed out") return } } return
- 27. Python? Python 2.7:gevent Greenlets + Queues Python 3.4: asyncio Coroutines + Queues PythonCSP
- 28. Other languages occam Limbo Clojure
- 29. 1. rodolfocarvalho.net! 2.golang.org/s/concurrency-is-not-parallelism! 3. golang.org/s/concurrency-patterns! 4. www.infoq.com/presentations/core-async-clojure! 5. asyncio.org! 6. wiki.python.org/moin/Concurrency