2 files changed, 4 insertions, 2 deletions
diff --git a/src/thread/pthread_spin_lock.c b/src/thread/pthread_spin_lock.c
index 0462e0f3..ded2b653 100644
--- a/src/thread/pthread_spin_lock.c
+++ b/src/thread/pthread_spin_lock.c
@@ -1,7 +1,8 @@
 #include "pthread_impl.h"
+#include <errno.h>
 
 int pthread_spin_lock(pthread_spinlock_t *s)
 {
-	while (*(volatile int *)s || a_cas(s, 0, 1)) a_spin();
+	while (*(volatile int *)s || a_cas(s, 0, EBUSY)) a_spin();
 	return 0;
 }
diff --git a/src/thread/pthread_spin_trylock.c b/src/thread/pthread_spin_trylock.c
index 59de695d..5284fdac 100644
--- a/src/thread/pthread_spin_trylock.c
+++ b/src/thread/pthread_spin_trylock.c
@@ -1,6 +1,7 @@
 #include "pthread_impl.h"
+#include <errno.h>
 
 int pthread_spin_trylock(pthread_spinlock_t *s)
 {
-	return -a_swap(s, 1) & EBUSY;
+	return a_cas(s, 0, EBUSY);
 }