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cigarette-smoker.go
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cigarette-smoker.go
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package main
import (
"fmt"
"runtime"
"time"
"math/rand"
)
type semaphore chan int
var (
smoker_match = make(semaphore, 1)
smoker_paper = make(semaphore, 1)
smoker_tobacco = make(semaphore, 1)
smoking_done = make(semaphore, 1)
)
func (sema *semaphore) P() {
for {
if len(*sema) > 0 {
<- *sema
break
}
runtime.Gosched()
}
}
func (sema *semaphore) V() {
for {
if len(*sema) < cap(*sema) {
*sema <- 1
break
}
runtime.Gosched()
}
}
func provider() {
for {
random := rand.Intn(3)
switch (random) {
case 0:
smoker_match.V()
case 1:
smoker_paper.V()
case 2:
smoker_tobacco.V()
}
smoking_done.P()
}
}
func smoker_0() {
for {
smoker_match.P()
fmt.Println("Smoker who has match is smoking")
smoking_done.V()
}
}
func smoker_1() {
for {
smoker_paper.P()
fmt.Println("Smoker who has paper is smoking")
smoking_done.V()
}
}
func smoker_2() {
for {
smoker_tobacco.P()
fmt.Println("Smoker who has tobacco is smoking")
smoking_done.V()
}
}
func init() {
smoking_done.V()
}
func main() {
go provider()
go smoker_0()
go smoker_1()
go smoker_2()
time.Sleep(time.Duration(5) * time.Millisecond)
return
}