libgo/go/sync/cas.c

   1 /* cas.c -- implement sync.cas for Go.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include <stdint.h>
   8
   9 _Bool cas (int32_t *, int32_t, int32_t) asm ("libgo_sync.sync.cas");
  10
  11 _Bool
  12 cas (int32_t *ptr, int32_t old, int32_t new)
  13 {
  14   return __sync_bool_compare_and_swap (ptr, old, new);
  15 }