diff options
Diffstat (limited to 'intern/cycles/util/util_atomic.h')
-rw-r--r-- | intern/cycles/util/util_atomic.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/intern/cycles/util/util_atomic.h b/intern/cycles/util/util_atomic.h new file mode 100644 index 00000000000..1bbb0a86e23 --- /dev/null +++ b/intern/cycles/util/util_atomic.h @@ -0,0 +1,33 @@ +/* + * Copyright 2014 Blender Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License + */ + +#ifndef __UTIL_ATOMIC_H__ +#define __UTIL_ATOMIC_H__ + +/* Using atomic ops header from Blender. */ +#include "atomic_ops.h" + +ATOMIC_INLINE void atomic_update_max_z(size_t *maximum_value, size_t value) +{ + size_t prev_value = *maximum_value; + while (prev_value < value) { + if (atomic_cas_z(maximum_value, prev_value, value) != prev_value) { + break; + } + } +} + +#endif /* __UTIL_ATOMIC_H__ */ |