Initial project import

tools/v/vlib/x/atomics/examples/counter.v

@@ -0,0 +1,40 @@
+module main
+
+import x.atomics
+
+fn increment(counter &i64) {
+	atomics.add_i64(counter, 1)
+}
+
+fn worker(counter &i64, iterations int) {
+	for _ in 0 .. iterations {
+		increment(counter)
+	}
+}
+
+fn main() {
+	mut counter := i64(0)
+
+	num_threads := 4
+	increments_per_thread := 10000
+
+	mut threads := []thread{}
+
+	for _ in 0 .. num_threads {
+		threads << spawn worker(&counter, increments_per_thread)
+	}
+
+	threads.wait()
+
+	expected := i64(num_threads * increments_per_thread)
+	actual := atomics.load_i64(&counter)
+
+	println('Expected: ${expected}')
+	println('Actual:   ${actual}')
+
+	if actual == expected {
+		println('Counter is correct')
+	} else {
+		println('Counter mismatch - race condition detected')
+	}
+}