public PosixPageFileBackedMemoryMapPager(string file, long?initialFileSize = null)
{
var instanceId = Interlocked.Increment(ref _counter);
_file = "/" + Syscall.getpid() + "-" + instanceId + "-" + file;
_fd = Rt.shm_open(_file, OpenFlags.O_RDWR | OpenFlags.O_CREAT, (int)FilePermissions.ALLPERMS);
if (_fd == -1)
{
PosixHelper.ThrowLastError(Marshal.GetLastWin32Error());
}
SysPageSize = Syscall.sysconf(SysconfName._SC_PAGESIZE);
if (initialFileSize.HasValue)
{
_totalAllocationSize = NearestSizeToPageSize(initialFileSize.Value);
}
_totalAllocationSize = NearestSizeToPageSize(_totalAllocationSize);
var result = Syscall.ftruncate(_fd, _totalAllocationSize);
if (result != 0)
{
PosixHelper.ThrowLastError(result);
}
NumberOfAllocatedPages = _totalAllocationSize / PageSize;
PagerState.Release();
PagerState = CreatePagerState();
}
public PosixTempMemoryMapPager(string file, long?initialFileSize = null)
{
var instanceId = Interlocked.Increment(ref _counter);
_file = "/var/tmp/ravendb-" + Syscall.getpid() + "-" + instanceId + "-" + file;
_fd = Syscall.open(_file, OpenFlags.O_RDWR | OpenFlags.O_CREAT | OpenFlags.O_EXCL,
FilePermissions.S_IWUSR | FilePermissions.S_IRUSR);
if (_fd == -1)
{
PosixHelper.ThrowLastError(Marshal.GetLastWin32Error());
}
DeleteOnClose = true;
SysPageSize = Syscall.sysconf(SysconfName._SC_PAGESIZE);
_totalAllocationSize = NearestSizeToPageSize(initialFileSize ?? _totalAllocationSize);
PosixHelper.AllocateFileSpace(_fd, (ulong)_totalAllocationSize);
NumberOfAllocatedPages = _totalAllocationSize / PageSize;
PagerState.Release();
PagerState = CreatePagerState();
}