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Source Code
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package main
import (
"fmt"
"math/rand"
"sync"
"time"
)
type Semaphore chan struct{}
func NewSemaphore(capacity int) Semaphore {
return make(Semaphore, capacity)
}
func (s Semaphore) Acquire() {
s <- struct{}{}
}
func (s Semaphore) Release() {
<-s
}
const (
partyCapacity = 5
totalGuests = 10
)
func guest(id int, partyRoom Semaphore, wg *sync.WaitGroup) {
defer wg.Done()
fmt.Printf("Guest %d is trying to enter the party room\n", id)
partyRoom.Acquire()
fmt.Printf("Guest %d has entered the party room\n", id)
// Party for a random duration
partyDuration := time.Duration(rand.Intn(3)+1) * time.Second
time.Sleep(partyDuration)
fmt.Printf("Guest %d is leaving the party room\n", id)
partyRoom.Release()
}
func main() {
partyRoom := NewSemaphore(partyCapacity)
var wg sync.WaitGroup
for i := 0; i < totalGuests; i++ {
wg.Add(1)
go guest(i, partyRoom, &wg)
// Small delay to make output more readable
time.Sleep(100 * time.Millisecond)
}
wg.Wait()
fmt.Println("The party is over!")
}
Compiling Program...
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