Initial project import

tools/v/vlib/sync/spinlock_test.v

@@ -0,0 +1,42 @@
+import sync
+import rand
+import time
+
+fn test_spinlock() {
+	mut counter := 0
+	mut s := sync.new_spin_lock()
+	defer {
+		s.destroy()
+	}
+	num_threads := 10
+	iterations := 10
+	mut wg := sync.new_waitgroup()
+	wg.add(num_threads)
+
+	for _ in 0 .. num_threads {
+		spawn fn (mut wg sync.WaitGroup, s &sync.SpinLock, counter_ref &int, iterations int) {
+			for _ in 0 .. iterations {
+				s.lock()
+
+				unsafe {
+					tmp := *counter_ref
+					randval := rand.intn(100) or { 1 }
+					time.sleep(randval * time.nanosecond)
+
+					(*counter_ref) = tmp + 1
+				}
+				s.unlock()
+			}
+			wg.done()
+		}(mut wg, s, &counter, iterations)
+	}
+	wg.wait()
+	assert counter == num_threads * iterations
+
+	// test try_lock()
+	s.lock()
+	assert s.try_lock() == false
+	s.unlock()
+	assert s.try_lock() == true
+	assert s.try_lock() == false
+}