42 lines
905 B
Go
42 lines
905 B
Go
package main
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import (
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"fmt"
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"time"
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)
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// worker, of which will run several concurrent instances
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// those workers will receive work on the jobs channel and send the corresponding results on results
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func worker(id int, jobs <-chan int, results chan<- int) {
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for j := range jobs {
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fmt.Println("worker", id, "started job", j)
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time.Sleep(time.Second)
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fmt.Println("worker", id, "finished job", j)
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results <- j * 2
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}
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}
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func main() {
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// send workers work and collect their results
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const numJobs = 5
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jobs := make(chan int, numJobs)
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results := make(chan int, numJobs)
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// starts up 3 workers, initially blocked because there are no jobs
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for w := 1; w <= 3; w++ {
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go worker(w, jobs, results)
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}
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// send 5 jobs and then close that channel
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for j := 1; j <= numJobs; j++ {
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jobs <- j
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}
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close(jobs)
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// collect all the results of the work
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for a := 1; a <= numJobs; a++ {
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<-results
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}
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}
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