Mutual Exclusion of Concurrent Goroutines

Question

In my code there are three concurrent routines. I try to give a brief overview of my code,

Routine 1 {
do something

*Send int to Routine 2
Send int to Routi         


        

Answer 1

Another way would be to have a control channel, with only one goroutine allowed to execute at any one time, with each routine sending back to the 'control lock' whenever they are done doing their atomic operation:

package main
import "fmt"
import "time"

func routine(id int, control chan struct{}){
    for {
        // Get the control
        <-control
        fmt.Printf("routine %d got control\n", id)
        fmt.Printf("A lot of things happen here...")
        time.Sleep(1)
        fmt.Printf("... but only in routine %d !\n", id)
        fmt.Printf("routine %d gives back control\n", id)
        // Sending back the control to whichever other routine catches it
        control<-struct{}{}
    }
}

func main() {
    // Control channel is blocking
    control := make(chan struct{})

    // Start all routines
    go routine(0, control)
    go routine(1, control)
    go routine(2, control)

    // Sending control to whichever catches it first
    control<-struct{}{}
    // Let routines play for some time...
    time.Sleep(10)
    // Getting control back and terminating
    <-control
    close(control)
    fmt.Println("Finished !")
}

This prints:

routine 0 got control
A lot of things happen here...... but only in routine 0 !
routine 0 gives back control
routine 1 got control
A lot of things happen here...... but only in routine 1 !
routine 1 gives back control
routine 2 got control
A lot of things happen here...... but only in routine 2 !
routine 2 gives back control
routine 0 got control
A lot of things happen here...... but only in routine 0 !
routine 0 gives back control
routine 1 got control
A lot of things happen here...... but only in routine 1 !
routine 1 gives back control
routine 2 got control
A lot of things happen here...... but only in routine 2 !
routine 2 gives back control
routine 0 got control
A lot of things happen here...... but only in routine 0 !
routine 0 gives back control
routine 1 got control
A lot of things happen here...... but only in routine 1 !
routine 1 gives back control
routine 2 got control
A lot of things happen here...... but only in routine 2 !
routine 2 gives back control
routine 0 got control
A lot of things happen here...... but only in routine 0 !
routine 0 gives back control
routine 1 got control
A lot of things happen here...... but only in routine 1 !
routine 1 gives back control
routine 2 got control
A lot of things happen here...... but only in routine 2 !
routine 2 gives back control
Finished !