// Copyright (c) 2018-2022, The Monero Project // // All rights reserved. // // Redistribution and use in source and binary forms, with or without modification, are // permitted provided that the following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this list of // conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, this list // of conditions and the following disclaimer in the documentation and/or other // materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its contributors may be // used to endorse or promote products derived from this software without specific // prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #pragma once #include <map> #include <boost/thread/mutex.hpp> namespace epee { class mlocker { public: mlocker(void *ptr, size_t len); ~mlocker(); static size_t get_page_size(); static size_t get_num_locked_pages(); static size_t get_num_locked_objects(); static void lock(void *ptr, size_t len); static void unlock(void *ptr, size_t len); private: static size_t page_size; static size_t num_locked_objects; static boost::mutex &mutex(); static std::map<size_t, unsigned int> &map(); static void lock_page(size_t page); static void unlock_page(size_t page); void *ptr; size_t len; }; /// Locks memory while in scope /// /// Primarily useful for making sure that private keys don't get swapped out // to disk template <class T> struct mlocked : public T { using type = T; mlocked(): T() { mlocker::lock(this, sizeof(T)); } mlocked(const T &t): T(t) { mlocker::lock(this, sizeof(T)); } mlocked(const mlocked<T> &mt): T(mt) { mlocker::lock(this, sizeof(T)); } mlocked(const T &&t): T(t) { mlocker::lock(this, sizeof(T)); } mlocked(const mlocked<T> &&mt): T(mt) { mlocker::lock(this, sizeof(T)); } mlocked<T> &operator=(const mlocked<T> &mt) { T::operator=(mt); return *this; } ~mlocked() { try { mlocker::unlock(this, sizeof(T)); } catch (...) { /* do not propagate */ } } }; template<typename T> T& unwrap(mlocked<T>& src) { return src; } template<typename T> const T& unwrap(mlocked<T> const& src) { return src; } template <class T, size_t N> using mlocked_arr = mlocked<std::array<T, N>>; }