abseil-cpp/absl/flags/flag.cc

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//
//  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