explicit lock operations, described later). These include:
xchg();
- cmpxchg();
atomic_xchg(); atomic_long_xchg();
- atomic_cmpxchg(); atomic_long_cmpxchg();
atomic_inc_return(); atomic_long_inc_return();
atomic_dec_return(); atomic_long_dec_return();
atomic_add_return(); atomic_long_add_return();
test_and_clear_bit();
test_and_change_bit();
- /* when succeeds (returns 1) */
+ /* when succeeds */
+ cmpxchg();
+ atomic_cmpxchg(); atomic_long_cmpxchg();
atomic_add_unless(); atomic_long_add_unless();
These are used for such things as implementing ACQUIRE-class and RELEASE-class