<p><b>@kaspar030</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10908#discussion_r256365427">tests/thread_msg_block_race/main.c</a>:</p>
<pre style='color:#555'>> +        msg_t msg = { .type = 0U };
+
+        write(STDOUT_FILENO, ".", 1U);
+        /* send without blocking */
+        msg_try_send(&msg, _pid_main);
+        thread_yield();
+    }
+
+    return NULL;
+}
+
+int main(void)
+{
+    kernel_pid_t pid;
+
+    timer_init(TIMER_DEV(0), TIMER_FREQ, _timer, NULL);
</pre>
<p>I'm not sure this will work on <em>all</em> platforms. IIRC arduino cannot set to 1MHz.</p>

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