Implement __sync_lock_test_and_set_4.
Change-Id: Ib986df235bd8695ee206880c2c51e33a424912db
diff --git a/lib/atomic-arm.c b/lib/atomic-arm.c
index ad82824..13d3b53 100644
--- a/lib/atomic-arm.c
+++ b/lib/atomic-arm.c
@@ -311,6 +311,18 @@
return android_atomic_cas_val(oldval, newval, ptr);
}
+uint32_t __sync_lock_test_and_set_4 (volatile uint32_t *ptr, uint32_t val)
+{
+ uint32_t status, prev;
+ android_memory_barrier();
+ do {
+ prev = *ptr;
+ status = android_atomic_cas_bool(prev, val, ptr);
+ } while (__builtin_expect(status != 0, 0));
+
+ return prev;
+}
+
/* __sync_op_and_fetch functions */
int32_t __sync_add_and_fetch_4(volatile int32_t *ptr, int32_t val)
