diff --git a/tests/multithread/1.0/IMultithread.hal b/tests/multithread/1.0/IMultithread.hal
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+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.tests.multithread@1.0;
+
+/**
+ * IMultithread tests configureRpcThreadpool
+ *
+ * Makes calls finish only when specific number of them are running in parallel
+ */
+interface IMultithread {
+    /**
+     * Sets up controller
+     * Must be called for each test
+     * @param maxThreads arg passed to configureRpcThreadpool
+     * Could not be decremented by future calls
+     * @param numThreads number of calls in parallel to finish
+     */
+    setNumThreads(int32_t maxThreads, int32_t numThreads);
+
+    /**
+     * Makes a new call
+     * @return noTimeout numThreads appeared in parallel before timeout
+     * Shall return the same value for one setNumThreads call
+     */
+    runNewThread() generates (bool noTimeout);
+};