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feature
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test-sync-compare-and-swap.c
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#include
<stdint.h>
volatile
uint64_t
x
;
int
main
(
int
argc
,
char
*
argv
[])
{
uint64_t
old
,
new
=
argc
;
argv
=
argv
;
do
{
old
=
__sync_val_compare_and_swap
(&
x
,
0
,
0
);
}
while
(!
__sync_bool_compare_and_swap
(&
x
,
old
,
new
));
return
old
==
new
;
}