| // |
| // Copyright 2019 The Abseil Authors. |
| // |
| // 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 |
| // |
| // https://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 "absl/flags/flag.h" |
| |
| #include "absl/base/config.h" |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| |
| // This global mutex protects on-demand construction of flag objects in MSVC |
| // builds. |
| #if defined(_MSC_VER) && !defined(__clang__) |
| |
| namespace flags_internal { |
| |
| ABSL_CONST_INIT static absl::Mutex construction_guard(absl::kConstInit); |
| |
| absl::Mutex* GetGlobalConstructionGuard() { return &construction_guard; } |
| |
| } // namespace flags_internal |
| |
| #endif |
| |
| ABSL_NAMESPACE_END |
| } // namespace absl |
