You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.8 KiB
70 lines
1.8 KiB
// Copyright (c) 2009-2015 The Bitcoin Core developers |
|
// Distributed under the MIT software license, see the accompanying |
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php. |
|
|
|
#include "support/pagelocker.h" |
|
|
|
#if defined(HAVE_CONFIG_H) |
|
#include "config/bitcoin-config.h" |
|
#endif |
|
|
|
#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 |
|
|
|
LockedPageManager* LockedPageManager::_instance = NULL; |
|
boost::once_flag LockedPageManager::init_flag = BOOST_ONCE_INIT; |
|
|
|
/** 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) != 0; |
|
#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) != 0; |
|
#else |
|
return munlock(addr, len) == 0; |
|
#endif |
|
} |
|
|
|
LockedPageManager::LockedPageManager() : LockedPageManagerBase<MemoryPageLocker>(GetSystemPageSize()) |
|
{ |
|
}
|
|
|