Abseil Common Libraries (C++) (grcp 依赖)
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52 lines
1.7 KiB
52 lines
1.7 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#ifndef ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_ |
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#define ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_ |
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// This header defines two macros: |
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// |
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// If the platform supports thread-local storage: |
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// |
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// * ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a |
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// thread-local variable |
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// * ABSL_PER_THREAD_TLS is 1 |
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// |
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// Otherwise: |
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// |
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// * ABSL_PER_THREAD_TLS_KEYWORD is empty |
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// * ABSL_PER_THREAD_TLS is 0 |
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// |
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// Microsoft C supports thread-local storage. |
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// GCC supports it if the appropriate version of glibc is available, |
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// which the programmer can indicate by defining ABSL_HAVE_TLS |
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#include "absl/base/port.h" // For ABSL_HAVE_TLS |
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#if defined(ABSL_PER_THREAD_TLS) |
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#error ABSL_PER_THREAD_TLS cannot be directly set |
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#elif defined(ABSL_PER_THREAD_TLS_KEYWORD) |
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#error ABSL_PER_THREAD_TLS_KEYWORD cannot be directly set |
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#elif defined(ABSL_HAVE_TLS) |
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#define ABSL_PER_THREAD_TLS_KEYWORD __thread |
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#define ABSL_PER_THREAD_TLS 1 |
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#elif defined(_MSC_VER) |
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#define ABSL_PER_THREAD_TLS_KEYWORD __declspec(thread) |
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#define ABSL_PER_THREAD_TLS 1 |
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#else |
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#define ABSL_PER_THREAD_TLS_KEYWORD |
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#define ABSL_PER_THREAD_TLS 0 |
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#endif |
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#endif // ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
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