From e28926c7ef059ae9c0148e4ca363584ecda90e05 Mon Sep 17 00:00:00 2001
From: Mikhail Knyazhev <markus621@gmail.com>
Date: Sat, 3 Aug 2024 02:34:02 +0300
Subject: [PATCH] add Semaphore

---
 control/semaphore.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 control/semaphore.go

diff --git a/control/semaphore.go b/control/semaphore.go
new file mode 100644
index 0000000..4bba711
--- /dev/null
+++ b/control/semaphore.go
@@ -0,0 +1,25 @@
+package control
+
+type (
+	Semaphore interface {
+		Acquire()
+		Release()
+	}
+	_semaphore struct {
+		c chan struct{}
+	}
+)
+
+func NewSemaphore(count uint64) Semaphore {
+	return &_semaphore{
+		c: make(chan struct{}, count),
+	}
+}
+
+func (s *_semaphore) Acquire() {
+	s.c <- struct{}{}
+}
+
+func (s *_semaphore) Release() {
+	<-s.c
+}