68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
// Copyright 2023 The Marl 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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// A wrapper around a thread_local variable, or a pthread key
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#ifndef marl_thread_local_h
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#define marl_thread_local_h
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#ifdef MARL_USE_PTHREAD_THREAD_LOCAL
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#include "debug.h"
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#include <pthread.h>
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#include <type_traits>
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template <typename T>
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class ThreadLocal {
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static_assert(std::is_pointer<T>::value,
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"The current implementation of ThreadLocal requires that T "
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"must be a pointer");
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public:
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inline ThreadLocal(T v) {
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pthread_key_create(&key, NULL);
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pthread_setspecific(key, v);
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}
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inline ~ThreadLocal() { pthread_key_delete(key); }
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inline operator T() const { return static_cast<T>(pthread_getspecific(key)); }
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inline ThreadLocal& operator=(T v) {
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pthread_setspecific(key, v);
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return *this;
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}
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private:
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ThreadLocal(const ThreadLocal&) = delete;
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ThreadLocal& operator=(const ThreadLocal&) = delete;
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pthread_key_t key;
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};
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#define MARL_DECLARE_THREAD_LOCAL(TYPE, NAME) static ThreadLocal<TYPE> NAME
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#define MARL_INSTANTIATE_THREAD_LOCAL(TYPE, NAME, VALUE) \
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ThreadLocal<TYPE> NAME { \
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VALUE \
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}
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#else
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#define MARL_DECLARE_THREAD_LOCAL(TYPE, NAME) static thread_local TYPE NAME
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#define MARL_INSTANTIATE_THREAD_LOCAL(TYPE, NAME, VALUE) \
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thread_local TYPE NAME { \
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VALUE \
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}
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#endif
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#endif // marl_thread_local_h
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