Исходники и презентации

lessons/sync_primitives/semaphore/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"sync"
+)
+
+type Semaphore struct {
+	count     int
+	max       int
+	condition *sync.Cond
+}
+
+func NewSemaphore(limit int) *Semaphore {
+	mutex := &sync.Mutex{}
+	return &Semaphore{
+		max:       limit,
+		condition: sync.NewCond(mutex),
+	}
+}
+
+func (s *Semaphore) Acquire() {
+	s.condition.L.Lock()
+	defer s.condition.L.Unlock()
+
+	for s.count >= s.max {
+		s.condition.Wait()
+	}
+
+	s.count++
+}
+
+func (s *Semaphore) Release() {
+	s.condition.L.Lock()
+	defer s.condition.L.Unlock()
+
+	s.count--
+	s.condition.Signal()
+}