28. Toad Notes Go language--concurrency simple example

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28. Toad Notes Go language--concurrency simple example

Concurrency sample

Package Main

Import (

"FMT"

"Time"

)

Func Ready (W string, sec Int64) {

secs: =time. Duration (SEC) * time. Second

Time. Sleep (secs)

Fmt. Println (W, "is ready!")

}

Func Main () {

Goready ("Tee", 2)

Goready ("Coffee", 1)

Fmt. Println ("I ' mwaiting")

secs: =time. Duration (2) * time. Second

Time. Sleep (5* secs)

}

Output:

I ' mwaiting

Coffeeis ready!

Teeis ready!

Go syntax features

No shared memory, no memory lock, concurrent language-goroutines

Communication between Goroutines by the words ⾔ their own channels to deliver the message

In short, this ⼀ is useful for simply writing secure concurrent programs.

Parallel computing

Code:

Package Main

Import "FMT"

Func sum (values []int, Resultchan Chan int) {

Sum: =0

For _,value: = Range Values {

sum+= value

}

resultchan<-sum// sends the result of the calculation to Channel in

}

Func Main () {

values:= []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

resultchan:= make (chan int, 2)

Gosum (Values[:len (values)/2], Resultchan)

Gosum (Values[len (values)/2:], Resultchan)

sum1,sum2: = <-resultchan, <-resultchan// Receive Results

Fmt. Println ("Result:", Sum1, sum2, sum1+sum2)

}

Execution results

result:40 15 55