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