public EphemeralBufferPoolWindows(int bufferSize, int bufferCount)
{
if (bufferSize < 1)
{
throw new ArgumentOutOfRangeException(nameof(bufferSize));
}
if (bufferCount < 1)
{
throw new ArgumentOutOfRangeException(nameof(bufferSize));
}
SYSTEM_INFO sysInfo;
GetSystemInfo(out sysInfo);
var pages = (int)Math.Ceiling((bufferCount * bufferSize) / (double)sysInfo.dwPageSize);
var totalAllocated = pages * sysInfo.dwPageSize;
_bufferCount = totalAllocated / bufferSize;
_bufferSize = bufferSize;
_totalAllocated = new UIntPtr((uint)totalAllocated);
_memory = VirtualAlloc(IntPtr.Zero, _totalAllocated, MemOptions.MEM_COMMIT | MemOptions.MEM_RESERVE, PageOptions.PAGE_READWRITE);
VirtualLock(_memory, _totalAllocated);
for (var i = 0; i < totalAllocated; i += bufferSize)
{
var mem = new EphemeralMemory(IntPtr.Add(_memory, i), bufferSize);
_buffers.Enqueue(mem);
}
}
public EphemeralBufferPoolUnix(int bufferSize, int bufferCount)
{
if (bufferSize < 1)
{
throw new ArgumentOutOfRangeException(nameof(bufferSize));
}
if (bufferCount < 1)
{
throw new ArgumentOutOfRangeException(nameof(bufferSize));
}
var pageSize = SysConf(SysConfName._SC_PAGESIZE);
if (pageSize < 0)
{
ExceptionHelper.ThrowException(new InvalidOperationException("Unable to get system page size"));
}
var pages = (int)Math.Ceiling((bufferCount * bufferSize) / (double)pageSize);
_totalAllocated = pages * pageSize;
_bufferCount = (int)_totalAllocated / bufferSize;
_bufferSize = bufferSize;
_memory = MMap(IntPtr.Zero, (ulong)_totalAllocated, MemoryMappedProtections.PROT_READ | MemoryMappedProtections.PROT_WRITE, MemoryMappedFlags.MAP_PRIVATE | MemoryMappedFlags.MAP_ANONYMOUS, new IntPtr(-1), 0);
if (_memory.ToInt64() < 0)
{
ExceptionHelper.ThrowException(new InvalidOperationException("Unable to get system page size"));
}
if (MLock(_memory, (ulong)_totalAllocated) < 0)
{
ExceptionHelper.ThrowException(new InvalidOperationException("Unable to get system page size"));
}
for (var i = 0; i < _totalAllocated; i += bufferSize)
{
var mem = new EphemeralMemory(IntPtr.Add(_memory, i), bufferSize);
_buffers.Enqueue(mem);
}
}
