49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
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// 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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// http://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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// If the platform supports thread-local storage:
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// ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a
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// thread-local variable ABSL_PER_THREAD_TLS is 1
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//
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// Otherwise:
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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 programme 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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