From 6d6b93afdcf1851b0d034864b0cb1b79633c54d7 Mon Sep 17 00:00:00 2001
From: JulianHolzwarth <julian.holzwarth@fu-berlin.de>
Date: Fri, 12 Jul 2019 16:21:16 +0200
Subject: [PATCH] sys/xtimer/xtimer.c: new function
 xtimer_rmutex_lock_timeout()

function tries to acquire a mutex within a timeout
---
 sys/xtimer/xtimer.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sys/xtimer/xtimer.c b/sys/xtimer/xtimer.c
index a721431680..7b14001caa 100644
--- a/sys/xtimer/xtimer.c
+++ b/sys/xtimer/xtimer.c
@@ -24,6 +24,7 @@
 
 #include "xtimer.h"
 #include "mutex.h"
+#include "rmutex.h"
 #include "thread.h"
 #include "irq.h"
 #include "div.h"
@@ -270,6 +271,20 @@ int xtimer_mutex_lock_timeout(mutex_t *mutex, uint64_t timeout)
     return -mt.dequeued;
 }
 
+int xtimer_rmutex_lock_timeout(rmutex_t *rmutex, uint64_t timeout)
+{
+    if (rmutex_trylock(rmutex)) {
+        return 0;
+    }
+    if (xtimer_mutex_lock_timeout(&rmutex->mutex, timeout) == 0) {
+        atomic_store_explicit(&rmutex->owner,
+                              thread_getpid(), memory_order_relaxed);
+        rmutex->refcount++;
+        return 0;
+    }
+    return -1;
+}
+
 #ifdef MODULE_CORE_THREAD_FLAGS
 static void _set_timeout_flag_callback(void* arg)
 {