summaryrefslogtreecommitdiffstats
path: root/src/vppinfra/lock.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/vppinfra/lock.h')
-rw-r--r--src/vppinfra/lock.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/vppinfra/lock.h b/src/vppinfra/lock.h
index cc6a7f086b1..c1f0b87dfc6 100644
--- a/src/vppinfra/lock.h
+++ b/src/vppinfra/lock.h
@@ -17,6 +17,7 @@
#define included_clib_lock_h
#include <vppinfra/clib.h>
+#include <vppinfra/atomics.h>
#if __x86_64__
#define CLIB_PAUSE() __builtin_ia32_pause ()
@@ -76,8 +77,15 @@ clib_spinlock_free (clib_spinlock_t * p)
static_always_inline void
clib_spinlock_lock (clib_spinlock_t * p)
{
- while (clib_atomic_test_and_set (&(*p)->lock))
- CLIB_PAUSE ();
+ u32 free = 0;
+ while (!clib_atomic_cmp_and_swap_acq_relax_n (&(*p)->lock, &free, 1, 0))
+ {
+ /* atomic load limits number of compare_exchange executions */
+ while (clib_atomic_load_relax_n (&(*p)->lock))
+ CLIB_PAUSE ();
+ /* on failure, compare_exchange writes (*p)->lock into free */
+ free = 0;
+ }
CLIB_LOCK_DBG (p);
}