added vtimer test case

tests/test_vtimer_msg/Makefile

@@ -0,0 +1,14 @@
+# name of your project
+export PROJECT = test_vtimer_msg
+
+# for easy switching of boards
+export BOARD ?= native
+
+# this has to be the absolute path of the RIOT-base dir
+export RIOTBASE = $(CURDIR)/../..
+
+## Modules to include.
+USEMODULE += auto_init
+USEMODULE += vtimer
+
+include $(RIOTBASE)/Makefile.include

tests/test_vtimer_msg/main.c

@@ -0,0 +1,97 @@
+#include <stdio.h>
+#include <time.h>
+
+#include "vtimer.h"
+#include "thread.h"
+#include "msg.h"
+
+char timer_stack[KERNEL_CONF_STACKSIZE_PRINTF];
+char timer_stack_local[KERNEL_CONF_STACKSIZE_PRINTF];
+
+struct timer_msg {
+    vtimer_t timer;
+    timex_t interval;
+    char* msg;
+};
+
+timex_t now;
+
+struct timer_msg msg_a = { .timer = {0}, .interval = { .seconds = 2, .microseconds = 0}, .msg = "Hello World" };
+struct timer_msg msg_b = { .timer = {0}, .interval = { .seconds = 5, .microseconds = 0}, .msg = "This is a Test" };
+
+void timer_thread(void)
+{
+    printf("This is thread %d\n", thread_getpid());
+
+    /* we need a queue if the second message arrives while the first is still processed */
+    /* without a queue, the message would get lost */
+    /* because of the way this timer works, there can be max 1 queued message */
+    msg_t msgq[1];
+    msg_init_queue(msgq, sizeof msgq);
+
+    while (1) {
+        msg_t m;
+        msg_receive(&m);
+        struct timer_msg* tmsg = (struct timer_msg*) m.content.ptr;
+        vtimer_now(&now);
+        printf("now=%" PRIu32 ":%" PRIu32 " -> every %u.%us: %s\n",
+                now.seconds,
+                now.microseconds,
+                tmsg->interval.seconds,
+                tmsg->interval.microseconds,
+                tmsg->msg);
+        if (vtimer_set_msg(&tmsg->timer, tmsg->interval, thread_getpid(), tmsg) != 0) {
+            puts("something went wrong");
+        }
+        else {
+            puts("timer_thread: set timer successfully");
+        }
+    }
+}
+
+void timer_thread_local(void)
+{
+    printf("This is thread %d\n", thread_getpid());
+
+    while (1) {
+        msg_t m;
+        msg_receive(&m);
+
+        struct tm t;
+        vtimer_get_localtime(&t);
+        printf("sec=%d min=%d hour=%d\n", t.tm_sec, t.tm_min, t.tm_hour);
+    }
+}
+
+int main(void) {
+    msg_t m;
+    int pid = thread_create(
+            timer_stack,
+            sizeof timer_stack,
+            PRIORITY_MAIN-1,
+            CREATE_STACKTEST,
+            timer_thread,
+            "timer");
+
+    puts("sending 1st msg");
+    m.content.ptr = (char*) &msg_a;
+    msg_send(&m, pid, false);
+
+    puts("sending 2nd msg");
+    m.content.ptr = (char*) &msg_b;
+    msg_send(&m, pid, false);
+
+    int pid2 = thread_create(
+            timer_stack_local,
+            sizeof timer_stack_local,
+            PRIORITY_MAIN-1,
+            CREATE_STACKTEST,
+            timer_thread_local,
+            "timer local");
+
+    timex_t sleep = timex_set(1, 0);
+    while (1) {
+        vtimer_sleep(sleep);
+        msg_send(&m, pid2, 0);
+    }
+}