contrib/compiler-rt/lib/builtins/atomic_flag_test_and_set_explicit.c

   1 /*===-- atomic_flag_test_and_set_explicit.c ---------------------------------===
   2  *
   3  *                     The LLVM Compiler Infrastructure
   4  *
   5  * This file is dual licensed under the MIT and the University of Illinois Open
   6  * Source Licenses. See LICENSE.TXT for details.
   7  *
   8  *===------------------------------------------------------------------------===
   9  *
  10  * This file implements atomic_flag_test_and_set_explicit from C11's stdatomic.h
  11  *
  12  *===------------------------------------------------------------------------===
  13  */
  14
  15 #ifndef __has_include
  16 #define __has_include(inc) 0
  17 #endif
  18
  19 #if __has_include(<stdatomic.h>)
  20
  21 #include <stdatomic.h>
  22 #undef atomic_flag_test_and_set_explicit
  23 _Bool atomic_flag_test_and_set_explicit(volatile atomic_flag *object,
  24                                         memory_order order) {
  25   return __c11_atomic_exchange(&(object)->_Value, 1, order);
  26 }
  27
  28 #endif