Adding plasma example

plasma/kernel/dlltest.c

@@ -0,0 +1,38 @@
+// dlltest.c
+// Compile this program with "make dlltest".  
+// Then ftp test.bin to /flash/bin/dlltest.
+// Then from a telnet prompt type "dlltest".
+#include "dll.h"
+
+
+void SocketReceive(IPSocket *socket)
+{
+}
+
+
+void MyThread(void *sock)
+{
+   char buf[80];
+   int i, bytes;
+   IPSocket *socket = sock;
+
+   for(i = 0; i < 10; ++i)
+   {
+      bytes = IPRead(socket, buf, sizeof(buf)-1);
+      buf[bytes] = 0;
+      IPPrintf(socket, "%d %s\n", i, buf);
+      OS_ThreadSleep(100);
+   }
+   socket->funcPtr = socket->userFunc;  //restore socket receive function
+}
+
+
+// Function shouldn't block
+void Start(IPSocket *socket, char *argv[])
+{
+   IPPrintf(socket, "Hello from dlltest\n");
+   socket->userFunc = socket->funcPtr;  //remember prev socket receive func
+   socket->funcPtr = SocketReceive;     //new socket receive function
+   OS_ThreadCreate("MyThread", MyThread, socket, 100, 0);
+}
+