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# rsyslog
#
# atomic_operations.m4 - autoconf macro to check if compiler supports atomic
# operations
#
# rgerhards, 2008-09-18, added based on
# http://svn.apache.org/repos/asf/apr/apr/trunk/configure.in
#
#
AC_DEFUN([RS_ATOMIC_OPERATIONS],
[AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_atomic_builtins],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[
unsigned long val = 1010, tmp, *mem = &val;
if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020)
return 1;
tmp = val;
if (__sync_fetch_and_sub(mem, 1010) != tmp || val != 1010)
return 1;
if (__sync_sub_and_fetch(&val, 1010) != 0 || val != 0)
return 1;
tmp = 3030;
if (__sync_val_compare_and_swap(mem, 0, tmp) != 0 || val != tmp)
return 1;
if (__sync_lock_test_and_set(&val, 4040) != 3030)
return 1;
mem = &tmp;
if (__sync_val_compare_and_swap(&mem, &tmp, &val) != &tmp)
return 1;
__sync_synchronize();
if (mem != &val)
return 1;
return 0;
]])], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no])])
if test "$ap_cv_atomic_builtins" = "yes"; then
AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins])
fi
])
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