/* * Copyright (c) Facebook, Inc. and its affiliates. * * 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