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author | Andrew Morrow <acm@mongodb.com> | 2017-06-19 12:27:08 -0400 |
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committer | Andrew Morrow <acm@mongodb.com> | 2017-06-20 09:47:22 -0400 |
commit | e05068da490e900c68d5254a7336d6f7b9354ad6 (patch) | |
tree | 3ecac75a41fa59fe9f69408629556001fc10eb56 /src/mongo/stdx | |
parent | 3d25846ea31d91468475086035f4794ad126ed0f (diff) | |
download | mongo-e05068da490e900c68d5254a7336d6f7b9354ad6.tar.gz |
SERVER-29712 Add a polyfill for std::hardware_constructive_interference_size
Diffstat (limited to 'src/mongo/stdx')
-rw-r--r-- | src/mongo/stdx/new.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/mongo/stdx/new.h b/src/mongo/stdx/new.h new file mode 100644 index 00000000000..158223d35d2 --- /dev/null +++ b/src/mongo/stdx/new.h @@ -0,0 +1,58 @@ +/** + * Copyright (C) 2017 MongoDB Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License, version 3, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * As a special exception, the copyright holders give permission to link the + * code of portions of this program with the OpenSSL library under certain + * conditions as described in each individual source file and distribute + * linked combinations including the program with the OpenSSL library. You + * must comply with the GNU Affero General Public License in all respects for + * all of the code used other than as permitted herein. If you modify file(s) + * with this exception, you may extend this exception to your version of the + * file(s), but you are not obligated to do so. If you do not wish to do so, + * delete this exception statement from your version. If you delete this + * exception statement from all source files in the program, then also delete + * it in the license file. + */ + +#pragma once + +#include "mongo/config.h" + +#include <cstddef> +#include <new> + +namespace mongo { +namespace stdx { + +#if __cplusplus < 201703L + +#if defined(MONGO_CONFIG_MAX_EXTENDED_ALIGNMENT) +static_assert(MONGO_CONFIG_MAX_EXTENDED_ALIGNMENT >= sizeof(uint64_t), "Bad extended alignment"); +constexpr std::size_t hardware_destructive_interference_size = MONGO_CONFIG_MAX_EXTENDED_ALIGNMENT; +#else +constexpr std::size_t hardware_destructive_interference_size = alignof(std::max_align_t); +#endif + +constexpr auto hardware_constructive_interference_size = hardware_destructive_interference_size; + +#else + +using std::hardware_constructive_interference_size; +using std::hardware_destructive_interference_size; + +#endif + +} // namespace stdx +} // namespace mongo |