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70 lines
1.8 KiB
70 lines
1.8 KiB
// 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 "support/pagelocker.h" |
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#if defined(HAVE_CONFIG_H) |
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#include "config/bitcoin-config.h" |
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#endif |
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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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