Create allocatorc.cpp file

[novacoin.git] / src / allocators.cpp

diff --git a/src/allocators.cpp b/src/allocators.cpp
new file mode 100644 (file)
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--- /dev/null
+++ b/src/allocators.cpp
@@ -0,0 +1,65 @@
+// 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
+#if (_WIN32_WINNT != _WIN32_WINNT_WIN7)
+#define _WIN32_WINNT 0x601
+#endif
+#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 <climits> // for PAGESIZE
+#include <unistd.h> // for sysconf
+#endif
+
+LockedPageManager* LockedPageManager::_instance = nullptr;
+std::once_flag LockedPageManager::init_flag{};
+
+/** 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())
+{
+}