| commit | 0a7f17cf5b591330a257ed0485f759d4e600972c | [log] [tgz] |
|---|---|---|
| author | Nicolai Hähnle <nicolai.haehnle@amd.com> | Fri Nov 03 15:19:57 2017 +0100 |
| committer | Nicolai Hähnle <nicolai.haehnle@amd.com> | Thu Nov 09 11:37:30 2017 +0100 |
| tree | 70fb2f459b7a55ad711e303463d2218a6ba75cdd | |
| parent | b4b2a951c8b4c1315c06cb4d58dbc787949daa4c [diff] |
util/u_atomic: add p_atomic_xchg The closest to it in the old-style gcc builtins is __sync_lock_test_and_set, however, that is only guaranteed to work with values 0 and 1 and only provides an acquire barrier. I also don't know about other OSes, so we provide a simple & stupid emulation via p_atomic_cmpxchg. Reviewed-by: Marek Olšák <marek.olsak@amd.com>