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183 lines
4.8 KiB
C++
183 lines
4.8 KiB
C++
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// 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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#if defined __GNUC__ && !defined _WIN32
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#define HAVE_MLOCK 1
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#endif
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#include <unistd.h>
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#if defined HAVE_MLOCK
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#include <sys/mman.h>
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#endif
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#include "misc_log_ex.h"
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#include "syncobj.h"
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#include "mlocker.h"
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static size_t query_page_size()
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{
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#if defined HAVE_MLOCK
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long ret = sysconf(_SC_PAGESIZE);
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if (ret <= 0)
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{
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MERROR("Failed to determine page size");
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return 0;
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}
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MINFO("Page size: " << ret);
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return ret;
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#else
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#warning Missing query_page_size implementation
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#endif
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return 0;
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}
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static void do_lock(void *ptr, size_t len)
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{
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#if defined HAVE_MLOCK
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int ret = mlock(ptr, len);
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if (ret < 0)
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MERROR("Error locking page at " << ptr << ": " << strerror(errno));
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#else
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#warning Missing do_lock implementation
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#endif
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}
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static void do_unlock(void *ptr, size_t len)
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{
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#if defined HAVE_MLOCK
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int ret = munlock(ptr, len);
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if (ret < 0)
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MERROR("Error unlocking page at " << ptr << ": " << strerror(errno));
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#else
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#warning Missing implementation of page size detection
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#endif
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}
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namespace epee
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{
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size_t mlocker::page_size = 0;
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size_t mlocker::num_locked_objects = 0;
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boost::mutex &mlocker::mutex()
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{
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static boost::mutex vmutex;
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return vmutex;
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}
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std::map<size_t, unsigned int> &mlocker::map()
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{
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static std::map<size_t, unsigned int> vmap;
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return vmap;
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}
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size_t mlocker::get_page_size()
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{
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CRITICAL_REGION_LOCAL(mutex());
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if (page_size == 0)
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page_size = query_page_size();
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return page_size;
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}
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mlocker::mlocker(void *ptr, size_t len): ptr(ptr), len(len)
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{
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lock(ptr, len);
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}
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mlocker::~mlocker()
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{
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unlock(ptr, len);
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}
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void mlocker::lock(void *ptr, size_t len)
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{
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size_t page_size = get_page_size();
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if (page_size == 0)
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return;
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CRITICAL_REGION_LOCAL(mutex());
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const size_t first = ((uintptr_t)ptr) / page_size;
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const size_t last = (((uintptr_t)ptr) + len - 1) / page_size;
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for (size_t page = first; page <= last; ++page)
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lock_page(page);
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++num_locked_objects;
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}
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void mlocker::unlock(void *ptr, size_t len)
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{
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size_t page_size = get_page_size();
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if (page_size == 0)
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return;
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CRITICAL_REGION_LOCAL(mutex());
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const size_t first = ((uintptr_t)ptr) / page_size;
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const size_t last = (((uintptr_t)ptr) + len - 1) / page_size;
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for (size_t page = first; page <= last; ++page)
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unlock_page(page);
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--num_locked_objects;
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}
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size_t mlocker::get_num_locked_pages()
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{
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CRITICAL_REGION_LOCAL(mutex());
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return map().size();
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}
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size_t mlocker::get_num_locked_objects()
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{
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CRITICAL_REGION_LOCAL(mutex());
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return num_locked_objects;
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}
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void mlocker::lock_page(size_t page)
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{
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std::pair<std::map<size_t, unsigned int>::iterator, bool> p = map().insert(std::make_pair(page, 1));
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if (p.second)
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{
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do_lock((void*)(page * page_size), page_size);
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}
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else
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{
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++p.first->second;
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}
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}
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void mlocker::unlock_page(size_t page)
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{
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std::map<size_t, unsigned int>::iterator i = map().find(page);
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if (i == map().end())
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{
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MERROR("Attempt to unlock unlocked page at " << (void*)(page * page_size));
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}
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else
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{
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if (!--i->second)
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{
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map().erase(i);
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do_unlock((void*)(page * page_size), page_size);
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}
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}
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}
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}
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