Mutex example
1.Without
package main
import "fmt"
var counter int = 0
func main() {
ch := make(chan bool)
for i := 1; i < 5; i++{
go work(i, ch)
}
for i := 1; i < 5; i++{
<-ch
}
fmt.Println("The End")
}
func work (number int, ch chan bool){
counter = 0
for k := 1; k <= 5; k++{
counter++
fmt.Println("Goroutine", number, "-", counter)
}
ch <- true
}
Output
Goroutine 3 - 1
Goroutine 3 - 2
Goroutine 3 - 3
Goroutine 3 - 4
Goroutine 3 - 5
Goroutine 2 - 1
Goroutine 2 - 6
Goroutine 2 - 7
Goroutine 2 - 8
Goroutine 2 - 9
Goroutine 1 - 1
Goroutine 1 - 10
Goroutine 1 - 11
Goroutine 1 - 12
Goroutine 1 - 13
Goroutine 4 - 1
Goroutine 4 - 14
Goroutine 4 - 15
Goroutine 4 - 16
Goroutine 4 - 17
The End
2. With
package main
import (
"fmt"
"sync"
)
var counter int = 0
func main() {
ch := make(chan bool)
var mutex sync.Mutex
for i := 1; i < 5; i++{
go work(i, ch, &mutex)
}
for i := 1; i < 5; i++{
<-ch
}
fmt.Println("The End")
}
func work (number int, ch chan bool, mutex *sync.Mutex){
mutex.Lock()
counter = 0
for k := 1; k <= 5; k++{
counter++
fmt.Println("Goroutine", number, "-", counter)
}
mutex.Unlock()
ch <- true
}
Output
Goroutine 1 - 1
Goroutine 1 - 2
Goroutine 1 - 3
Goroutine 1 - 4
Goroutine 1 - 5
Goroutine 4 - 1
Goroutine 4 - 2
Goroutine 4 - 3
Goroutine 4 - 4
Goroutine 4 - 5
Goroutine 3 - 1
Goroutine 3 - 2
Goroutine 3 - 3
Goroutine 3 - 4
Goroutine 3 - 5
Goroutine 2 - 1
Goroutine 2 - 2
Goroutine 2 - 3
Goroutine 2 - 4
Goroutine 2 - 5
The End
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