From 718664daccdaa42301a093914e46cf08df01ca34 Mon Sep 17 00:00:00 2001
From: Joakim Gebart <joakim.gebart@eistec.se>
Date: Sun, 26 Apr 2015 09:22:17 +0200
Subject: [PATCH] sys/posix/pthread: Use atomic_int_t to handle spin lock

---
 sys/posix/pthread/pthread_spin.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/sys/posix/pthread/pthread_spin.c b/sys/posix/pthread/pthread_spin.c
index 14319f1bf1..07806cc943 100644
--- a/sys/posix/pthread/pthread_spin.c
+++ b/sys/posix/pthread/pthread_spin.c
@@ -13,6 +13,7 @@
  * @brief   Spin locks.
  * @author  Christian Mehlis <mehlis@inf.fu-berlin.de>
  * @author  René Kijewski <kijewski@inf.fu-berlin.de>
+ * @author  Joakim Gebart <joakim.gebart@eistec.se>
  * @}
  */
 
@@ -46,9 +47,10 @@ int pthread_spin_lock(pthread_spinlock_t *lock)
         return EINVAL;
     }
 
-    while (atomic_set_return((unsigned *) lock, 1) != 0) {
+    while (atomic_set_to_one((int *)lock) == 0) {
         /* spin */
     }
+
     return 0;
 }
 
@@ -58,7 +60,11 @@ int pthread_spin_trylock(pthread_spinlock_t *lock)
         return EINVAL;
     }
 
-    return atomic_set_return((unsigned *) lock, 1) == 0 ? 0 : EBUSY;
+    if (atomic_set_to_one((int *)lock) == 0) {
+        return EBUSY;
+    }
+
+    return 0;
 }
 
 int pthread_spin_unlock(pthread_spinlock_t *lock)
@@ -67,5 +73,9 @@ int pthread_spin_unlock(pthread_spinlock_t *lock)
         return EINVAL;
     }
 
-    return atomic_set_return((unsigned *) lock, 0) != 0 ? 0 : EPERM;
+    if (atomic_set_to_zero((int *)lock) == 0) {
+        return EPERM;
+    }
+
+    return 0;
 }