vppinfra: add atomic macros for __sync builtins

This is first part of addition of atomic macros with only macros for
__sync builtins.

- Based on earlier patch by Damjan (https://gerrit.fd.io/r/#/c/10729/)
Additionally
- clib_atomic_release macro added and used in the absence
of any memory barrier.
- clib_atomic_bool_cmp_and_swap added

Change-Id: Ie4e48c1e184a652018d1d0d87c4be80ddd180a3b
Original-patch-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Sirshak Das <sirshak.das@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index d8abdf31d79..438bf7e5ee4 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -923,7 +923,7 @@ vlib_buffer_attach_clone (vlib_main_t * vm, vlib_buffer_t * head,
     tail->total_length_not_including_first_buffer;
 
 next_segment:
-  __sync_add_and_fetch (&tail->n_add_refs, 1);
+  clib_atomic_add_fetch (&tail->n_add_refs, 1);
 
   if (tail->flags & VLIB_BUFFER_NEXT_PRESENT)
     {
@@ -1153,7 +1153,7 @@ vlib_validate_buffer_in_use (vlib_buffer_t * b, u32 expected)
 
   oldheap = clib_mem_set_heap (vlib_buffer_state_heap);
 
-  while (__sync_lock_test_and_set (vlib_buffer_state_validation_lock, 1))
+  while (clib_atomic_test_and_set (vlib_buffer_state_validation_lock))
     ;
 
   p = hash_get (vlib_buffer_state_validation_hash, b);
@@ -1196,7 +1196,7 @@ vlib_validate_buffer_set_in_use (vlib_buffer_t * b, u32 expected)
 
   oldheap = clib_mem_set_heap (vlib_buffer_state_heap);
 
-  while (__sync_lock_test_and_set (vlib_buffer_state_validation_lock, 1))
+  while (clib_atomic_test_and_set (vlib_buffer_state_validation_lock))
     ;
 
   hash_set (vlib_buffer_state_validation_hash, b, expected);