futex/include/atomic.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
8  *      http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html
11  *      Darren Hart <dvhart@linux.intel.com>
14  *      2009-Nov-17: Initial version by Darren Hart <dvhart@linux.intel.com>
28  * atomic_cmpxchg() - Atomic compare and exchange
33  * Return the old value of addr->val.
38 	return __sync_val_compare_and_swap(&addr->val, oldval, newval);  in atomic_cmpxchg()
42  * atomic_inc() - Atomic incrememnt
45  * Return the new value of addr->val.
50 	return __sync_add_and_fetch(&addr->val, 1);  in atomic_inc()
54  * atomic_dec() - Atomic decrement
57  * Return the new value of addr-val.
62 	return __sync_sub_and_fetch(&addr->val, 1);  in atomic_dec()
66  * atomic_set() - Atomic set
70  * Return the new value of addr->val.
75 	addr->val = newval;  in atomic_set()