我是Golang并發(fā)的新手，一直在努力理解下面提到的這段代碼。我目睹了一些我無法解釋為什么會發(fā)生的事情：for i <= 100000 {在 main 函數(shù)中 使用小于等于 100000 的 i 時，它有時會為 nResults 和 countWrites 打印不同的值（在最后兩個語句中）fmt.Printf("number of result writes %d\n", nResults) fmt.Printf("Number of job writes %d\n", jobWrites)當(dāng)我使用超過 1000000 時，它給出panic: send on closed channel我如何確保發(fā)送給作業(yè)的值不在關(guān)閉的通道上，并且稍后在結(jié)果中收到所有值后我們可以關(guān)閉通道而不會出現(xiàn)死鎖？package mainimport (    "fmt"    "sync")func worker(wg *sync.WaitGroup, id int, jobs <-chan int, results chan<- int, countWrites *int64) {    defer wg.Done()    for j := range jobs {        *countWrites += 1        go func(j int) {            if j%2 == 0 {                results <- j * 2            } else {                results <- j            }        }(j)    }}func main() {    wg := &sync.WaitGroup{}    jobs := make(chan int)    results := make(chan int)    var i int = 1    var jobWrites int64 = 0    for i <= 10000000 {        go func(j int) {            if j%2 == 0 {                i += 99                j += 99            }            jobWrites += 1            jobs <- j        }(i)        i += 1    }    var nResults int64 = 0    for w := 1; w < 1000; w++ {        wg.Add(1)        go worker(wg, w, jobs, results, &nResults)    }    close(jobs)    wg.Wait()    var sum int32 = 0    var count int64 = 0    for r := range results {        count += 1        sum += int32(r)        if count == nResults {            close(results)        }    }    fmt.Println(sum)    fmt.Printf("number of result writes %d\n", nResults)    fmt.Printf("Number of job writes %d\n", jobWrites)}