private byte[] Receive(SendRecvFlags flags)
{
IntPtr buffer = IntPtr.Zero;
int rc = Interop.nn_recv(_socket, ref buffer, Constants.NN_MSG, (int)flags);
if (rc < 0 || buffer == null)
{
return(null);
}
byte[] output = new byte[rc];
try
{
Marshal.Copy(buffer, output, 0, rc);
}
finally
{
rc = Interop.nn_freemsg(buffer);
if (rc != 0)
{
throw new NanomsgException("freemsg");
}
}
return(output);
}
/// <summary>
/// Receives a message of unknown length into a new buffer.
/// </summary>
/// <returns>
/// The error code from nn_freemsg. Should always be 0. Probably safe to ignore.
/// </returns>
/// <remarks>
/// This is a bit inefficient at the moment.
/// </remarks>
public static int Recv(int s, out byte[] buf, SendRecvFlags flags)
{
IntPtr buffer = IntPtr.Zero;
int rc = Interop.nn_recv(s, ref buffer, Constants.NN_MSG, (int)flags);
if (rc < 0)
{
buf = null;
return(rc);
}
int numberOfBytes = rc;
// this inefficient, I'm sure there must be a better way.
buf = new byte[numberOfBytes];
for (int i = 0; i < numberOfBytes; ++i)
{
buf[i] = Marshal.ReadByte(buffer, i);
}
int rc_free = Interop.nn_freemsg(buffer);
Debug.Assert(rc_free == 0);
return(rc);
}
private NanomsgReadStream ReceiveStream(SendRecvFlags flags)
{
IntPtr buffer = IntPtr.Zero;
int rc = Interop.nn_recv(_socket, ref buffer, Constants.NN_MSG, (int)flags);
if (rc < 0 || buffer == null)
{
return(null);
}
/*
* In order to prevent managed allocations per receive, we attempt to recycle stream objects. This
* will work optimally if the stream is disposed before the next receive call, as in this case each
* socket class will always reuse the same stream.
*
* Disposing the stream will both release its nanomsg-allocated native buffer and return it to its
* socket class for reuse.
*/
var stream = Interlocked.Exchange(ref _recycledReadStream, null);
if (stream != null)
{
stream.Reinitialize(buffer, rc);
}
else
{
stream = new NanomsgReadStream(buffer, rc,
_freeReadDisposer ?? (_freeReadDisposer = new NanomsgNativeDisposer()
{
Socket = (NanomsgSocketBase)this
}));
}
return(stream);
}