From 7b477b32b8dc3f2dcfa23b95b04259374f474e80 Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Tue, 11 Apr 2017 12:43:33 +0200
Subject: [PATCH] let unit test sys_arch check that a mutex is not taken
 recursively

---
 test/unit/arch/sys_arch.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/unit/arch/sys_arch.c b/test/unit/arch/sys_arch.c
index 3ef98199..3d4dec6a 100644
--- a/test/unit/arch/sys_arch.c
+++ b/test/unit/arch/sys_arch.c
@@ -156,7 +156,8 @@ void sys_mutex_lock(sys_mutex_t *mutex)
 {
   /* nothing to do, no multithreading supported */
   LWIP_ASSERT("mutex != NULL", mutex != NULL);
-  LWIP_ASSERT("*mutex >= 1", *mutex >= 1);
+  /* check that the mutext is valid and unlocked (no nested locking) */
+  LWIP_ASSERT("*mutex >= 1", *mutex == 1);
   /* we count up just to check the correct pairing of lock/unlock */
   (*mutex)++;
   LWIP_ASSERT("*mutex >= 1", *mutex >= 1);