Preparations for higher resolution timer were made for POSIX and WIN32 platform.

getMicroseconds() function now implements 64-bit microsecond timer from Windows'
		  QueryPerformanceCounter & QueryPerformanceFrequency. POSIX
		  gettimeofday is already in microsecond resolution.
MILLISECONDS is now unsigned long (modular arithmetics 1-x<2^32 returns correct
	     results)
new type MICROSECONDS unsigned long long
getmilliseconds() is now just an wrapper, which does division by 1000 of
	 	  getMicroseconds function result

.gitignore

@@ -5,5 +5,6 @@ source/src/cip_objects/
 !source/src/cip_objects/CMakeLists.txt
 .project
 .cproject
+.settings/
 *.*~
 *~

source/src/ports/POSIX/networkhandler.c

@@ -25,7 +25,8 @@ extern S_CIP_ConnectionObject *g_pstActiveConnectionList;
 
 #define MAX_NO_OF_TCP_SOCKETS 10
 
-typedef long MILLISECONDS;
+typedef unsigned long MILLISECONDS;
+typedef unsigned long long MICROSECONDS;
 fd_set master;
 fd_set read_fds;
 /* temporary file descriptor for select() */
@@ -69,20 +70,30 @@ checkSocketSet(int pa_nSocket);
 EIP_STATUS
 handleDataOnTCPSocket(int pa_nSocket);
 
-static MILLISECONDS
-getmilliseconds(void)
+static MICROSECONDS
+getMicroseconds()
 {
 #ifdef WIN32
-  SYSTEMTIME tt;
-  GetSystemTime(&tt);
-  return (MILLISECONDS) tt.wSecond * 1000 + (MILLISECONDS) tt.wMilliseconds;
+    LARGE_INTEGER lPerformanceCouner;
+    LARGE_INTEGER lPerformanceFrequency;
+
+    QueryPerformanceCounter(&lPerformanceCouner);
+    QueryPerformanceFrequency(&lPerformanceFrequency);
+
+    return (MICROSECONDS) (lPerformanceCouner.QuadPart * 1000000LL / lPerformanceFrequency.QuadPart);
 #else
   struct timeval tv;
   gettimeofday(&tv, 0);
-  return (MILLISECONDS) tv.tv_sec * 1000 + (MILLISECONDS) tv.tv_usec / 1000;
+  return (MICROSECONDS) tv.tv_sec * 1000000ULL + (MICROSECONDS) tv.tv_usec;
 #endif
 }
 
+static MILLISECONDS
+getmilliseconds(void)
+{
+    return (MILLISECONDS) ( getMicroseconds() / 1000ULL );
+}
+
 /* INT8 Start_NetworkHandler()
  * 	start a TCP listening socket, accept connections, receive data in select loop, call manageConnections periodically.
  * 	return status
@@ -212,6 +223,7 @@ NetworkHandler_ProcessOnce(void)
           0) * 1000; /* 10 ms */
 
   res = select(fdmax + 1, &read_fds, 0, 0, &tv);
+
   if (res == -1)
     {
       if (EINTR == errno) /* we have somehow been interrupted. The default behavior is to go back into the select loop. */

source/src/ports/WIN32/networkhandler.c

@@ -32,6 +32,7 @@ extern S_CIP_ConnectionObject *g_pstActiveConnectionList;
 #define MAX_NO_OF_TCP_SOCKETS 10
 
 typedef long MILLISECONDS;
+typedef unsigned long long MICROSECONDS;
 fd_set master;
 fd_set read_fds;
 /* temporary file descriptor for select() */
@@ -75,20 +76,30 @@ checkSocketSet(int pa_nSocket);
 EIP_STATUS
 handleDataOnTCPSocket(int pa_nSocket);
 
-static MILLISECONDS
-getmilliseconds(void)
+static MICROSECONDS
+getMicroseconds()
 {
 #ifdef WIN32
-  SYSTEMTIME tt;
-  GetSystemTime(&tt);
-  return (MILLISECONDS) tt.wSecond * 1000 + (MILLISECONDS) tt.wMilliseconds;
+    LARGE_INTEGER lPerformanceCouner;
+    LARGE_INTEGER lPerformanceFrequency;
+
+    QueryPerformanceCounter(&lPerformanceCouner);
+    QueryPerformanceFrequency(&lPerformanceFrequency);
+
+    return (MICROSECONDS) (lPerformanceCouner.QuadPart * 1000000LL / lPerformanceFrequency.QuadPart);
 #else
   struct timeval tv;
   gettimeofday(&tv, 0);
-  return (MILLISECONDS) tv.tv_sec * 1000 + (MILLISECONDS) tv.tv_usec / 1000;
+  return (MICROSECONDS) tv.tv_sec * 1000000ULL + (MICROSECONDS) tv.tv_usec;
 #endif
 }
 
+static MILLISECONDS
+getmilliseconds(void)
+{
+    return (MILLISECONDS) ( getMicroseconds() / 1000ULL );
+}
+
 /* INT8 Start_NetworkHandler()
  * 	start a TCP listening socket, accept connections, receive data in select loop, call manageConnections periodically.
  * 	return status
@@ -217,7 +228,8 @@ NetworkHandler_ProcessOnce(void)
           - TheNetworkStatus.elapsedtime :
           0) * 1000; /* 10 ms */
 
-  res = select(fdmax + 1, &read_fds, 0, 0, &tv);
+  printf("elapsed: %d\n", TheNetworkStatus.elapsedtime);
+
   if (res == -1)
     {
       if (EINTR == errno) /* we have somehow been interrupted. The default behavior is to go back into the select loop. */