per_thread_tls.h
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1 // Copyright 2017 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
16 #define ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
17 
18 // This header defines two macros:
19 //
20 // If the platform supports thread-local storage:
21 //
22 // * ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a
23 // thread-local variable
24 // * ABSL_PER_THREAD_TLS is 1
25 //
26 // Otherwise:
27 //
28 // * ABSL_PER_THREAD_TLS_KEYWORD is empty
29 // * ABSL_PER_THREAD_TLS is 0
30 //
31 // Microsoft C supports thread-local storage.
32 // GCC supports it if the appropriate version of glibc is available,
33 // which the programmer can indicate by defining ABSL_HAVE_TLS
34 
35 #include "absl/base/port.h" // For ABSL_HAVE_TLS
36 
37 #if defined(ABSL_PER_THREAD_TLS)
38 #error ABSL_PER_THREAD_TLS cannot be directly set
39 #elif defined(ABSL_PER_THREAD_TLS_KEYWORD)
40 #error ABSL_PER_THREAD_TLS_KEYWORD cannot be directly set
41 #elif defined(ABSL_HAVE_TLS)
42 #define ABSL_PER_THREAD_TLS_KEYWORD __thread
43 #define ABSL_PER_THREAD_TLS 1
44 #elif defined(_MSC_VER)
45 #define ABSL_PER_THREAD_TLS_KEYWORD __declspec(thread)
46 #define ABSL_PER_THREAD_TLS 1
47 #else
48 #define ABSL_PER_THREAD_TLS_KEYWORD
49 #define ABSL_PER_THREAD_TLS 0
50 #endif
51 
52 #endif // ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_


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autogenerated on Tue Jun 18 2019 19:44:37