Initial project import

tools/v/vlib/sync/array_rlock_test.v

@@ -0,0 +1,38 @@
+fn test_shared_modification() {
+	shared foo := &[2, 0, 5]
+	lock foo {
+		unsafe {
+			foo[1] = 3
+			foo[0] *= 7
+			foo[1]--
+			foo[2] -= 2
+		}
+	}
+	rlock foo {
+		unsafe {
+			assert foo[0] == 14
+			assert foo[1] == 2
+			assert foo[2] == 3
+		}
+	}
+}
+
+@[direct_array_access]
+fn test_shared_direct_modification() {
+	shared foo := &[2, 0, 5]
+	lock foo {
+		unsafe {
+			foo[1] = 3
+			foo[0] *= 7
+			foo[1]--
+			foo[2] -= 2
+		}
+	}
+	rlock foo {
+		unsafe {
+			assert foo[0] == 14
+			assert foo[1] == 2
+			assert foo[2] == 3
+		}
+	}
+}