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99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/* vim:set ts=2 sw=2 sts=2 et: */
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/**
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* \author Marcus Holland-Moritz (github@mhxnet.de)
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* \copyright Copyright (c) Marcus Holland-Moritz
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*
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* This file is part of dwarfs.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the “Software”), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* SPDX-License-Identifier: MIT
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*/
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#pragma once
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#include <mutex>
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#include <vector>
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#include <zstd.h>
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namespace dwarfs {
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class zstd_context_manager;
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class zstd_scoped_context {
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friend class zstd_context_manager;
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public:
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~zstd_scoped_context();
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zstd_scoped_context(zstd_scoped_context&&) = default;
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zstd_scoped_context& operator=(zstd_scoped_context&&) = default;
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ZSTD_CCtx* get() const { return ctx_; }
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private:
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explicit zstd_scoped_context(zstd_context_manager* mgr);
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zstd_context_manager* mgr_;
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ZSTD_CCtx* ctx_;
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};
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class zstd_context_manager {
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friend class zstd_scoped_context;
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public:
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zstd_context_manager() = default;
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~zstd_context_manager() {
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for (auto ctx : ctx_) {
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ZSTD_freeCCtx(ctx);
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}
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}
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zstd_scoped_context make_context() { return zstd_scoped_context(this); }
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private:
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ZSTD_CCtx* acquire() {
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std::lock_guard lock(mx_);
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if (ctx_.empty()) {
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return ZSTD_createCCtx();
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}
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auto ctx = ctx_.back();
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ctx_.pop_back();
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return ctx;
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}
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void release(ZSTD_CCtx* ctx) {
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std::lock_guard lock(mx_);
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ctx_.push_back(ctx);
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}
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std::mutex mx_;
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std::vector<ZSTD_CCtx*> ctx_;
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};
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inline zstd_scoped_context::zstd_scoped_context(zstd_context_manager* mgr)
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: mgr_{mgr}
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, ctx_{mgr_->acquire()} {}
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inline zstd_scoped_context::~zstd_scoped_context() { mgr_->release(ctx_); }
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} // namespace dwarfs
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