Add test cases for ConditionVariable

Add basic tests for the ConditionVariable class.

TESTS/mbedmicro-rtos-mbed/condition_variable/main.cpp

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+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * 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.
+ */
+#include "mbed.h"
+#include "greentea-client/test_env.h"
+#include "unity.h"
+#include "utest.h"
+#include "rtos.h"
+
+#if defined(MBED_RTOS_SINGLE_THREAD)
+  #error [NOT_SUPPORTED] test not supported
+#endif
+
+using namespace utest::v1;
+
+#define TEST_STACK_SIZE 512
+#define TEST_DELAY 10
+
+static int change_counter = 0;
+static Mutex mutex;
+static ConditionVariable cond(mutex);
+
+void increment_on_signal()
+{
+    mutex.lock();
+
+    cond.wait();
+    change_counter++;
+
+    mutex.unlock();
+}
+
+void test_notify_one()
+{
+    Thread t1(osPriorityNormal, TEST_STACK_SIZE);
+    Thread t2(osPriorityNormal, TEST_STACK_SIZE);
+
+    change_counter = 0;
+    t1.start(increment_on_signal);
+    t2.start(increment_on_signal);
+
+    wait_ms(TEST_DELAY);
+    TEST_ASSERT_EQUAL(0, change_counter);
+
+    mutex.lock();
+    cond.notify_one();
+    mutex.unlock();
+
+    wait_ms(TEST_DELAY);
+    TEST_ASSERT_EQUAL(1, change_counter);
+
+    mutex.lock();
+    cond.notify_one();
+    mutex.unlock();
+
+    t1.join();
+    t2.join();
+}
+
+void test_notify_all()
+{
+    Thread t1(osPriorityNormal, TEST_STACK_SIZE);
+    Thread t2(osPriorityNormal, TEST_STACK_SIZE);
+
+    change_counter = 0;
+    t1.start(increment_on_signal);
+    t2.start(increment_on_signal);
+
+    wait_ms(TEST_DELAY);
+    TEST_ASSERT_EQUAL(0, change_counter);
+
+    mutex.lock();
+    cond.notify_all();
+    mutex.unlock();
+
+    wait_ms(TEST_DELAY);
+    TEST_ASSERT_EQUAL(2, change_counter);
+
+    t1.join();
+    t2.join();
+}
+
+utest::v1::status_t test_setup(const size_t number_of_cases)
+{
+    GREENTEA_SETUP(10, "default_auto");
+    return verbose_test_setup_handler(number_of_cases);
+}
+
+Case cases[] = {
+    Case("Test notify one", test_notify_one),
+    Case("Test notify all", test_notify_all),
+};
+
+Specification specification(test_setup, cases);
+
+int main()
+{
+    return !Harness::run(specification);
+}