forked from townforge/townforge
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
// Copyright (c) 2018, The Monero Project
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//
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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 modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <map>
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#include <boost/thread/mutex.hpp>
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namespace epee
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{
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class mlocker
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{
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public:
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mlocker(void *ptr, size_t len);
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~mlocker();
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static size_t get_page_size();
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static size_t get_num_locked_pages();
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static size_t get_num_locked_objects();
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static void lock(void *ptr, size_t len);
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static void unlock(void *ptr, size_t len);
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private:
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static size_t page_size;
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static size_t num_locked_objects;
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static boost::mutex &mutex();
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static std::map<size_t, unsigned int> &map();
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static void lock_page(size_t page);
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static void unlock_page(size_t page);
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void *ptr;
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size_t len;
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};
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/// Locks memory while in scope
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///
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/// Primarily useful for making sure that private keys don't get swapped out
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// to disk
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template <class T>
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struct mlocked : public T {
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using type = T;
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mlocked(): T() { mlocker::lock(this, sizeof(T)); }
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mlocked(const T &t): T(t) { mlocker::lock(this, sizeof(T)); }
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mlocked(const mlocked<T> &mt): T(mt) { mlocker::lock(this, sizeof(T)); }
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mlocked(const T &&t): T(t) { mlocker::lock(this, sizeof(T)); }
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mlocked(const mlocked<T> &&mt): T(mt) { mlocker::lock(this, sizeof(T)); }
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mlocked<T> &operator=(const mlocked<T> &mt) { T::operator=(mt); return *this; }
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~mlocked() { try { mlocker::unlock(this, sizeof(T)); } catch (...) { /* do not propagate */ } }
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};
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template<typename T>
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T& unwrap(mlocked<T>& src) { return src; }
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template<typename T>
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const T& unwrap(mlocked<T> const& src) { return src; }
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template <class T, size_t N>
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using mlocked_arr = mlocked<std::array<T, N>>;
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}
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