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Diffstat (limited to 'src/allocators.cpp')
-rw-r--r-- | src/allocators.cpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/allocators.cpp b/src/allocators.cpp new file mode 100644 index 0000000000..b239b623d8 --- /dev/null +++ b/src/allocators.cpp @@ -0,0 +1,64 @@ +// Copyright (c) 2009-2013 The Bitcoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. + +#include "allocators.h" + +#ifdef WIN32 +#ifdef _WIN32_WINNT +#undef _WIN32_WINNT +#endif +#define _WIN32_WINNT 0x0501 +#define WIN32_LEAN_AND_MEAN 1 +#ifndef NOMINMAX +#define NOMINMAX +#endif +#include <windows.h> +// This is used to attempt to keep keying material out of swap +// Note that VirtualLock does not provide this as a guarantee on Windows, +// but, in practice, memory that has been VirtualLock'd almost never gets written to +// the pagefile except in rare circumstances where memory is extremely low. +#else +#include <sys/mman.h> +#include <limits.h> // for PAGESIZE +#include <unistd.h> // for sysconf +#endif + +/** Determine system page size in bytes */ +static inline size_t GetSystemPageSize() +{ + size_t page_size; +#if defined(WIN32) + SYSTEM_INFO sSysInfo; + GetSystemInfo(&sSysInfo); + page_size = sSysInfo.dwPageSize; +#elif defined(PAGESIZE) // defined in limits.h + page_size = PAGESIZE; +#else // assume some POSIX OS + page_size = sysconf(_SC_PAGESIZE); +#endif + return page_size; +} + +bool MemoryPageLocker::Lock(const void *addr, size_t len) +{ +#ifdef WIN32 + return VirtualLock(const_cast<void*>(addr), len); +#else + return mlock(addr, len) == 0; +#endif +} + +bool MemoryPageLocker::Unlock(const void *addr, size_t len) +{ +#ifdef WIN32 + return VirtualUnlock(const_cast<void*>(addr), len); +#else + return munlock(addr, len) == 0; +#endif +} + +LockedPageManager::LockedPageManager() : LockedPageManagerBase<MemoryPageLocker>(GetSystemPageSize()) +{ +} + |