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67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
// Copyright (c) 2009-2013 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "allocators.h"
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#ifdef WIN32
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#ifdef _WIN32_WINNT
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#undef _WIN32_WINNT
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#endif
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#define _WIN32_WINNT 0x0501
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#define WIN32_LEAN_AND_MEAN 1
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <windows.h>
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// This is used to attempt to keep keying material out of swap
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// Note that VirtualLock does not provide this as a guarantee on Windows,
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// but, in practice, memory that has been VirtualLock'd almost never gets written to
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// the pagefile except in rare circumstances where memory is extremely low.
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#else
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#include <sys/mman.h>
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#include <limits.h> // for PAGESIZE
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#include <unistd.h> // for sysconf
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#endif
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LockedPageManager* LockedPageManager::_instance = NULL;
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boost::once_flag LockedPageManager::init_flag = BOOST_ONCE_INIT;
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/** Determine system page size in bytes */
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static inline size_t GetSystemPageSize()
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{
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size_t page_size;
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#if defined(WIN32)
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SYSTEM_INFO sSysInfo;
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GetSystemInfo(&sSysInfo);
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page_size = sSysInfo.dwPageSize;
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#elif defined(PAGESIZE) // defined in limits.h
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page_size = PAGESIZE;
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#else // assume some POSIX OS
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page_size = sysconf(_SC_PAGESIZE);
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#endif
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return page_size;
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}
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bool MemoryPageLocker::Lock(const void* addr, size_t len)
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{
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#ifdef WIN32
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return VirtualLock(const_cast<void*>(addr), len) != 0;
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#else
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return mlock(addr, len) == 0;
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#endif
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}
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bool MemoryPageLocker::Unlock(const void* addr, size_t len)
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{
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#ifdef WIN32
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return VirtualUnlock(const_cast<void*>(addr), len) != 0;
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#else
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return munlock(addr, len) == 0;
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#endif
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}
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LockedPageManager::LockedPageManager() : LockedPageManagerBase<MemoryPageLocker>(GetSystemPageSize())
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{
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}
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