1 files changed, 11 insertions, 0 deletions
diff --git a/src/cas_spinlock.h b/src/cas_spinlock.h
new file mode 100644
index 0000000..cb2dabd
--- /dev/null
+++ b/src/cas_spinlock.h
@@ -0,0 +1,11 @@
+//#define CAS_LOCK_USLEEP 4
+#define CAS_LOCK_USLEEP 200
+
+static inline void lock(volatile int *aexclusion) {
+  while (__sync_lock_test_and_set(aexclusion, 1))
+    while (*aexclusion)
+      usleep(CAS_LOCK_USLEEP);
+}
+static inline void unlock(volatile int *aexclusion) {
+  __sync_lock_release(aexclusion); 
+}