type cond struct{
sema1 int32
sema2 int32
}
func (c *cond)printA(){
for {
if c.sema1==0{
println("A")
atomic.CompareAndSwapInt32(&c.sema1,0,1)
}
}

}

func (c *cond)printB(){
for {
if c.sema1==1&& c.sema2==0{
println("B")
atomic.CompareAndSwapInt32(&c.sema2,0,1)
}
}
}


func (c *cond) printC(){
for {
if c.sema2==1 {
println("C")
println("--------------------------------")
atomic.CompareAndSwapInt32(&c.sema1, 1, 0)
atomic.CompareAndSwapInt32(&c.sema2, 1, 0)
}
}
}

func main() {
var con =new (cond)
con.sema1=0
con.sema2=0
go con.printC()
go con.printB()
go con.printA()
time.Sleep(5*time.Second)

}