TCP/IP-32 Waits on Synchronous NCBs (128037)
The information in this article applies to:
- Microsoft Windows for Workgroups 3.11
- Microsoft TCP/IP-32 for Windows for Workgroups 3.11
This article was previously published under Q128037 SUMMARY
When a NetBIOS application, running under Windows for Workgroups using
TCP/IP-32, submits a synchronous command, all NetBIOS related network
activity stops until the NCB is responded to, or the application submits a
CANCEL or RESET command.
MORE INFORMATION
There are two types of NetBIOS commands; asynchronous and synchronous. All
NetBIOS capable transports, such as TCP/IP-32, return immediately to the
calling application for any asynchronous commands. The NetBIOS driver in
TCP/IP-32 sets the NCB_RETCODE field to FFH to indicate that the command
has been queued. When the command completes, the NCB_RETCODE field, as well
as NCB_CMD_CPLT, are set to the final return code.
In the case of synchronous commands, the TCP/IP-32 NetBIOS driver waits and
return only when the command has been satisfied or if the application
submits a NetBIOS CANCEL or RESET. As a result, all NetBIOS commands
submitted or received by the workstation are blocked until the outstanding
command is processed.
To avoid blocking other NetBIOS related activity, applications should be
written to submit asynchronous NCBs when possible.
| Modification Type: | Major | Last Reviewed: | 10/16/2003 |
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| Keywords: | KB128037 |
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