tests: added test for thread_flags + xtimer

tests/thread_flags_xtimer/Makefile

@@ -0,0 +1,7 @@
+APPLICATION = thread_flags_xtimer
+include ../Makefile.tests_common
+
+USEMODULE += core_thread_flags
+USEMODULE += xtimer
+
+include $(RIOTBASE)/Makefile.include

tests/thread_flags_xtimer/main.c

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2017 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License v2.1. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test waking up a thread using thread flags from xtimer callback
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "xtimer.h"
+#include "thread_flags.h"
+
+#define TIMEOUT         (100UL * US_PER_MS)
+#define REPEAT          (5)
+#define RUNTIME         (TIMEOUT * REPEAT)
+
+static void time_evt(void *arg)
+{
+    thread_flags_set((thread_t *)arg, 0x1);
+}
+
+int main(void)
+{
+
+    xtimer_t timer;
+    timer.callback = time_evt;
+    timer.arg = (void *)sched_active_thread;
+    uint32_t last = xtimer_now_usec();
+
+    puts("\nTest setting thread flags from (x)timer callback");
+    printf("You should see the message '+++ timeout XX +++' printed to the \n"
+           "screen %i times, once every %lu milliseconds\n\n",
+            REPEAT, (TIMEOUT / US_PER_MS));
+
+    for (int i = 1; i <= REPEAT; i++) {
+        xtimer_set(&timer, TIMEOUT);
+        thread_flags_wait_any(0x1);
+        printf("+++ timeout %2i +++\n", i);
+    }
+
+    /* we consider the test successful, if the runtime was above 500ms */
+    uint32_t runtime = xtimer_now_usec() - last;
+    if (runtime > RUNTIME) {
+        puts("Test finished: SUCCESS\n");
+    }
+    else {
+        puts("Test finished: FAILED\n");
+    }
+
+    return 0;
+}