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- /*
- * Copyright 2015-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/SharedMutex.h>
- namespace folly {
- // Explicitly instantiate SharedMutex here:
- template class SharedMutexImpl<true>;
- template class SharedMutexImpl<false>;
- namespace detail {
- std::unique_lock<std::mutex> sharedMutexAnnotationGuard(void* ptr) {
- if (folly::kIsSanitizeThread) {
- // On TSAN builds, we have an array of mutexes and index into them based on
- // the address. If the array is of prime size things will work out okay
- // without a complicated hash function.
- static constexpr std::size_t kNumAnnotationMutexes = 251;
- static std::array<std::mutex, kNumAnnotationMutexes> kAnnotationMutexes{};
- auto index = reinterpret_cast<uintptr_t>(ptr) % kNumAnnotationMutexes;
- return std::unique_lock<std::mutex>(kAnnotationMutexes[index]);
- } else {
- return std::unique_lock<std::mutex>();
- }
- }
- } // namespace detail
- } // namespace folly
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