123456789101112131415161718192021222324252627282930313233343536 |
- /*
- * Copyright 2017-present Facebook, Inc.
- *
- * 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.
- */
- #include <folly/synchronization/ParkingLot.h>
- #include <array>
- namespace folly {
- namespace parking_lot_detail {
- Bucket& Bucket::bucketFor(uint64_t key) {
- constexpr size_t const kNumBuckets = kIsMobile ? 256 : 4096;
- // Statically allocating this lets us use this in allocation-sensitive
- // contexts. This relies on the assumption that std::mutex won't dynamically
- // allocate memory, which we assume to be the case on Linux and iOS.
- static Indestructible<std::array<Bucket, kNumBuckets>> gBuckets;
- return (*gBuckets)[key % kNumBuckets];
- }
- std::atomic<uint64_t> idallocator{0};
- } // namespace parking_lot_detail
- } // namespace folly
|