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 override void Dispose()
{
base.Dispose();
if (_fd != -1)
{
Syscall.close(_fd);
Rt.shm_unlink(_file);
_fd = -1;
}
}
