public override void AllocateMorePages(Transaction tx, long newLength)
{
if (newLength <= _allocatedSize)
{
throw new ArgumentException("Cannot set the legnth to less than the current length");
}
var oldSize = _allocatedSize;
_allocatedSize = newLength;
NumberOfAllocatedPages = _allocatedSize / PageSize;
var newPtr = Marshal.AllocHGlobal(new IntPtr(_allocatedSize));
var newBase = (byte *)newPtr.ToPointer();
NativeMethods.memcpy(newBase, _base, new IntPtr(oldSize));
_base = newBase;
_ptr = newPtr;
var oldPager = PagerState;
var newPager = new PagerState {
Ptr = newPtr
};
newPager.AddRef(); // one for the pager
if (tx != null) // we only pass null during startup, and we don't need it there
{
newPager.AddRef(); // one for the current transaction
tx.AddPagerState(PagerState);
}
PagerState = newPager;
oldPager.Release();
}
public override void AllocateMorePages(Transaction tx, long newLength)
{
if (newLength < _fileStream.Length)
{
throw new ArgumentException("Cannot set the legnth to less than the current length");
}
if (newLength == _fileStream.Length)
{
return;
}
// need to allocate memory again
_fileStream.SetLength(newLength);
PagerState.Release(); // when the last transaction using this is over, will dispose it
PagerState newPager = CreateNewPagerState();
if (tx != null) // we only pass null during startup, and we don't need it there
{
newPager.AddRef(); // one for the current transaction
tx.AddPagerState(newPager);
}
PagerState = newPager;
NumberOfAllocatedPages = newPager.Accessor.Capacity / PageSize;
}
internal void EnsurePagerStateReference(PagerState state)
{
if (_pagerStates.Add(state))
{
state.AddRef();
}
}
protected AbstractPager()
{
MaxNodeSize = (PageSize - Constants.PageHeaderSize) / Constants.MinKeysInPage;
PageMaxSpace = PageSize - Constants.PageHeaderSize;
PageMinSpace = (int)(PageMaxSpace * 0.33);
PagerState = new PagerState();
_tempPage = Marshal.AllocHGlobal(PageSize);
PagerState.AddRef();
}
public PureMemoryPager()
{
_ptr = Marshal.AllocHGlobal(MinIncreaseSize);
_base = (byte *)_ptr.ToPointer();
NumberOfAllocatedPages = _allocatedSize / PageSize;
PagerState.Release();
PagerState = new PagerState
{
Ptr = _ptr
};
PagerState.AddRef();
}
internal void EnsurePagerStateReference(PagerState state)
{
if (state == _lastState || state == null)
{
return;
}
if (_pagerStates.Add(state))
{
state.AddRef();
_lastState = state;
}
}
public void EnsurePagerStateReference(PagerState state)
{
if (state == _lastState || state == null)
{
return;
}
_lastState = state;
if (_pagerStates.Add(state) == false)
{
return;
}
state.AddRef();
}
private PagerState CreateNewPagerState()
{
var mmf = MemoryMappedFile.CreateFromFile(_fileStream, Guid.NewGuid().ToString(), _fileStream.Length,
MemoryMappedFileAccess.ReadWrite, null, HandleInheritability.None, true);
var accessor = mmf.CreateViewAccessor();
byte* p = null;
accessor.SafeMemoryMappedViewHandle.AcquirePointer(ref p);
var newPager = new PagerState
{
Accessor = accessor,
File = mmf,
Base = p
};
newPager.AddRef(); // one for the pager
return newPager;
}
private PagerState CreateNewPagerState()
{
var mmf = MemoryMappedFile.CreateFromFile(_fileStream, Guid.NewGuid().ToString(), _fileStream.Length,
MemoryMappedFileAccess.ReadWrite, null, HandleInheritability.None, true);
var accessor = mmf.CreateViewAccessor();
byte *p = null;
accessor.SafeMemoryMappedViewHandle.AcquirePointer(ref p);
var newPager = new PagerState
{
Accessor = accessor,
File = mmf,
Base = p
};
newPager.AddRef(); // one for the pager
return(newPager);
}
private PagerState CreatePagerState()
{
var mmf = MemoryMappedFile.CreateFromFile(_fileStream, null, _fileStream.Length,
_memoryMappedFileAccess,
null, HandleInheritability.None, true);
var fileMappingHandle = mmf.SafeMemoryMappedFileHandle.DangerousGetHandle();
var mmFileAccessType = _access == Win32NativeFileAccess.GenericRead
? Win32MemoryMapNativeMethods.NativeFileMapAccessType.Read
: Win32MemoryMapNativeMethods.NativeFileMapAccessType.Read | Win32MemoryMapNativeMethods.NativeFileMapAccessType.Write;
var startingBaseAddressPtr = Win32MemoryMapNativeMethods.MapViewOfFileEx(fileMappingHandle,
mmFileAccessType,
0, 0,
UIntPtr.Zero, //map all what was "reserved" in CreateFileMapping on previous row
null);
if (startingBaseAddressPtr == (byte*)0) //system didn't succeed in mapping the address where we wanted
throw new Win32Exception();
var allocationInfo = new PagerState.AllocationInfo
{
BaseAddress = startingBaseAddressPtr,
Size = _fileStream.Length,
MappedFile = mmf
};
var newPager = new PagerState(this)
{
Files = new[] { mmf },
MapBase = startingBaseAddressPtr,
AllocationInfos = new[] { allocationInfo }
};
newPager.AddRef(); // one for the pager
return newPager;
}
private PagerState CreatePagerState()
{
var startingBaseAddressPtr = Syscall.mmap(IntPtr.Zero, (ulong)_totalAllocationSize,
MmapProts.PROT_READ | MmapProts.PROT_WRITE,
MmapFlags.MAP_SHARED, _fd, 0);
if (startingBaseAddressPtr.ToInt64() == -1) //system didn't succeed in mapping the address where we wanted
PosixHelper.ThrowLastError(Marshal.GetLastWin32Error());
var allocationInfo = new PagerState.AllocationInfo
{
BaseAddress = (byte*)startingBaseAddressPtr.ToPointer(),
Size = _totalAllocationSize,
MappedFile = null
};
var newPager = new PagerState(this)
{
Files = null, // unused
MapBase = allocationInfo.BaseAddress,
AllocationInfos = new[] { allocationInfo }
};
newPager.AddRef(); // one for the pager
return newPager;
}
private PagerState CreateInitialPagerState(long size)
{
var allocationSize = NearestSizeToAllocationGranularity(size);
var mmf = MemoryMappedFile.CreateNew(null, allocationSize, MemoryMappedFileAccess.ReadWrite);
var fileMappingHandle = mmf.SafeMemoryMappedFileHandle.DangerousGetHandle();
var startingBaseAddressPtr = Win32MemoryMapNativeMethods.MapViewOfFileEx(fileMappingHandle,
Win32MemoryMapNativeMethods.NativeFileMapAccessType.Read |
Win32MemoryMapNativeMethods.NativeFileMapAccessType.Write,
0, 0,
UIntPtr.Zero, //map all what was "reserved" in CreateFileMapping on previous row
null);
if (startingBaseAddressPtr == (byte*)0) //system didn't succeed in mapping the address where we wanted
throw new Win32Exception();
var allocationInfo = new PagerState.AllocationInfo
{
BaseAddress = startingBaseAddressPtr,
Size = allocationSize,
MappedFile = mmf
};
var newPager = new PagerState(this)
{
Files = new[] { mmf },
MapBase = startingBaseAddressPtr,
AllocationInfos = new[] { allocationInfo }
};
newPager.AddRef();
return newPager;
}
internal void EnsurePagerStateReference(PagerState state)
{
if (_pagerStates.Add(state))
state.AddRef();
}
