// 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_