use a_swap rather than old name a_xchg

diff --git a/src/thread/__lock.c b/src/thread/__lock.c
index 21c85fc..d171795 100644 (file)
--- a/src/thread/__lock.c
+++ b/src/thread/__lock.c
@@ -5,7 +5,7 @@ void __lock(volatile int *l)
        int spins=10000;
        /* Do not use futexes because we insist that unlocking is a simple
         * assignment to optimize non-pathological code with no contention. */
-       while (a_xchg(l, 1))
+       while (a_swap(l, 1))
                if (spins) spins--, a_spin();
                else __syscall(SYS_sched_yield);
 }