public SharedMem(int srcChan, int dstChan, string name, long bufferSize)
{
if (name == null || name == "")
{
name = "Unnamed Channel";
}
this.name = name;
this.srcChan = srcChan;
this.dstChan = dstChan;
this.bufferSize = bufferSize;
byte[] dBytes = new byte[name.Length];
ASCIIEncoding enc = new ASCIIEncoding();
shmemID = SharedMemNative.shmemchain_register_node_special(srcChan, dstChan, (int)bufferSize, enc.GetBytes(name));
if (shmemID < 0)
{
throw new NotSupportedException("Failed to register shmem node. Error code #" + SharedMemNative.shmemchain_get_last_error() + " #" + SharedMemNative.shmemchain_get_last_errorcode());
}
/* try to get the real channel ids */
foreach (NodeInfo info in GetNodeInfos())
{
if (info.shmemID == shmemID)
{
this.srcChan = info.srcChan;
this.dstChan = info.dstChan;
}
}
}
public override int Read(byte[] buffer, int offset, int count)
{
int readParam = (int)readMode;
if (SharedMemNative.shmemchain_get_last_error() != -100)
{
Log.AddMessage("Shmem Error: " + SharedMemNative.shmemchain_get_last_error() + " " + SharedMemNative.shmemchain_get_last_errorcode());
}
/* dynamic and time limited modes have the timeout in 100ms steps as parameter */
if (readMode == eReadMode.Dynamic || readMode == eReadMode.TimeLimited || readMode == eReadMode.TimeLimitedNoPartial)
{
readParam |= ((readTimeout + 99) / 100);
}
/* directly read into buffer */
if (offset == 0)
{
return((int)SharedMemNative.shmemchain_read_data(shmemID, buffer, (uint)count, readParam));
}
/* use a temporary buffer for writing at offset */
byte[] tmpBuffer = new byte[count];
int ret = (int)SharedMemNative.shmemchain_read_data(shmemID, tmpBuffer, (uint)count, readParam);
Array.Copy(tmpBuffer, 0, buffer, offset, count);
return(ret);
}
public static NodeInfo[] GetNodeInfos()
{
ArrayList nodes = new ArrayList();
int[] nodeIds = new int[512];
int used = SharedMemNative.shmemchain_get_all_nodes(nodeIds, nodeIds.Length);
for (int pos = 0; pos < used; pos++)
{
byte[] name = new byte[SharedMemNative.MAX_NAME_LENGTH];
ulong[] data = new ulong[7];
SharedMemNative.shmemchain_get_infos(nodeIds[pos], name, data);
int stringLength = 0;
while (name[stringLength] != (byte)0)
{
stringLength++;
}
NodeInfo info = new NodeInfo();
info.name = new ASCIIEncoding().GetString(name, 0, stringLength);
info.shmemID = nodeIds[pos];
info.srcChan = (int)data[0];
info.dstChan = (int)data[1];
info.bytesRead = data[2];
info.bytesWritten = data[3];
info.bufferSize = (uint)data[4];
info.bufferUsed = (uint)data[5];
info.pct = (int)data[6];
nodes.Add(info);
}
return((NodeInfo[])nodes.ToArray(typeof(NodeInfo)));
}
public override void Write(byte[] buffer, int offset, int count)
{
Failed |= SharedMemNative.shmemchain_write_data_ex(shmemID, buffer, (uint)offset, (uint)count) < 0;
}
public override void Flush()
{
SharedMemNative.shmemchain_read_data(shmemID, null, 0, SharedMemNative.MODE_FLUSH);
}
public int Unregister()
{
return(SharedMemNative.shmemchain_unregister_node(shmemID));
}
