62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _BIONIC_THREAD_LOCAL_BUFFER_H_included
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#define _BIONIC_THREAD_LOCAL_BUFFER_H_included
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#include <malloc.h>
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#include <pthread.h>
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// TODO: use __thread instead?
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template <typename T, size_t Size = sizeof(T)>
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class ThreadLocalBuffer {
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public:
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ThreadLocalBuffer() {
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// We used to use pthread_once to initialize the keys, but life is more predictable
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// if we allocate them all up front when the C library starts up, via __constructor__.
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pthread_key_create(&key_, free);
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}
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T* get() {
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T* result = reinterpret_cast<T*>(pthread_getspecific(key_));
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if (result == nullptr) {
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result = reinterpret_cast<T*>(calloc(1, Size));
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pthread_setspecific(key_, result);
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}
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return result;
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}
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size_t size() { return Size; }
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private:
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pthread_key_t key_;
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};
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#endif // _BIONIC_THREAD_LOCAL_BUFFER_H_included
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