per_thread_tls.h - mozsearch

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// Copyright 2017 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.

#ifndef ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_

#define ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_

// This header defines two macros:

//

// If the platform supports thread-local storage:

//

// * ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a

//   thread-local variable

// * ABSL_PER_THREAD_TLS is 1

//

// Otherwise:

//

// * ABSL_PER_THREAD_TLS_KEYWORD is empty

// * ABSL_PER_THREAD_TLS is 0

//

// Microsoft C supports thread-local storage.

// GCC supports it if the appropriate version of glibc is available,

// which the programmer can indicate by defining ABSL_HAVE_TLS

#include "absl/base/port.h"  // For ABSL_HAVE_TLS

#if defined(ABSL_PER_THREAD_TLS)

#error ABSL_PER_THREAD_TLS cannot be directly set

#elif defined(ABSL_PER_THREAD_TLS_KEYWORD)

#error ABSL_PER_THREAD_TLS_KEYWORD cannot be directly set

#elif defined(ABSL_HAVE_TLS)

#define ABSL_PER_THREAD_TLS_KEYWORD __thread

#define ABSL_PER_THREAD_TLS 1

#elif defined(_MSC_VER)

#define ABSL_PER_THREAD_TLS_KEYWORD __declspec(thread)

#define ABSL_PER_THREAD_TLS 1

#else

#define ABSL_PER_THREAD_TLS_KEYWORD

#define ABSL_PER_THREAD_TLS 0

#endif

#endif  // ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_