0b8f47dc53
This ensures the allocator is ready no matter when it's needed (as some STL implementations allocate in constructors -- i.e., MSVC's STL in debug builds). Using boost::call_once to guarantee thread-safe static initialization. Adding some comments describing why the change was made. Addressing deinitialization of the LockedPageManager object by initializing it in a local static initializer and adding an assert in the base's destructor.
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
// 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
|
|
|
|
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);
|
|
#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())
|
|
{
|
|
}
|
|
|