void HIDDEN
__sync_lock_release_4 (int *ptr)
{
int failure, oldval;
do {
oldval = *ptr;
failure = __kernel_cmpxchg (oldval, 0, ptr);
} while (failure != 0);
}
int HIDDEN
__sync_lock_test_and_set_4 (int *ptr, int val)
{
int failure, oldval;
do {
oldval = *ptr;
failure = __kernel_cmpxchg (oldval, val, ptr);
} while (failure != 0);
return oldval;
}
int HIDDEN
__sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
{
int actual_oldval, fail;
while (1)
{
actual_oldval = *ptr;
if (__builtin_expect (oldval != actual_oldval, 0))
return actual_oldval;
fail = __kernel_cmpxchg (actual_oldval, newval, ptr);
if (__builtin_expect (!fail, 1))
return oldval;
}
}
bool HIDDEN
__sync_bool_compare_and_swap_4 (int *ptr, int oldval, int newval)
{
int failure = __kernel_cmpxchg (oldval, newval, ptr);
return (failure == 0);
}
bool HIDDEN
__sync_bool_compare_and_swap_4 (unsigned *ptr, unsigned oldval,
unsigned newval)
{
return __kernel_cmpxchg (ptr, oldval, newval) == oldval;
}