| /** @file |
| |
| A brief file description |
| |
| @section license License |
| |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you 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 |
| |
| http://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. |
| */ |
| |
| /**************************************************************************** |
| |
| ProxyAllocator.h |
| |
| |
| |
| *****************************************************************************/ |
| #pragma once |
| |
| #include <new> |
| #include <utility> |
| |
| #include "tscore/ink_platform.h" |
| |
| class EThread; |
| |
| extern int thread_freelist_high_watermark; |
| extern int thread_freelist_low_watermark; |
| extern int cmd_disable_pfreelist; |
| |
| struct ProxyAllocator { |
| int allocated = 0; |
| void *freelist = nullptr; |
| |
| ProxyAllocator() {} |
| }; |
| |
| template <class CAlloc, typename... Args> |
| typename CAlloc::Value_type * |
| thread_alloc(CAlloc &a, ProxyAllocator &l, Args &&... args) |
| { |
| if (!cmd_disable_pfreelist && l.freelist) { |
| void *v = l.freelist; |
| l.freelist = *reinterpret_cast<void **>(l.freelist); |
| --(l.allocated); |
| ::new (v) typename CAlloc::Value_type(std::forward<Args>(args)...); |
| return static_cast<typename CAlloc::Value_type *>(v); |
| } |
| return a.alloc(std::forward<Args>(args)...); |
| } |
| |
| class Allocator; |
| |
| void *thread_alloc(Allocator &a, ProxyAllocator &l); |
| void thread_freeup(Allocator &a, ProxyAllocator &l); |
| |
| #if 1 |
| |
| // Potentially empty variable arguments -- non-standard GCC way |
| // |
| #define THREAD_ALLOC(_a, _t, ...) thread_alloc(::_a, _t->_a, ##__VA_ARGS__) |
| #define THREAD_ALLOC_INIT(_a, _t, ...) thread_alloc(::_a, _t->_a, ##__VA_ARGS__) |
| |
| #else |
| |
| // Potentially empty variable arguments -- Standard C++20 way |
| // |
| #define THREAD_ALLOC(_a, _t, ...) thread_alloc(::_a, _t->_a __VA_OPT__(, ) __VA_ARGS__) |
| #define THREAD_ALLOC_INIT(_a, _t, ...) thread_alloc(::_a, _t->_a __VA_OPT__(, ) __VA_ARGS__) |
| |
| #endif |
| |
| #define THREAD_FREE(_p, _a, _t) \ |
| do { \ |
| ::_a.destroy_if_enabled(_p); \ |
| if (!cmd_disable_pfreelist) { \ |
| *(char **)_p = (char *)_t->_a.freelist; \ |
| _t->_a.freelist = _p; \ |
| _t->_a.allocated++; \ |
| if (_t->_a.allocated > thread_freelist_high_watermark) \ |
| thread_freeup(::_a.raw(), _t->_a); \ |
| } else { \ |
| ::_a.raw().free_void(_p); \ |
| } \ |
| } while (0) |