Cisco Technology, Inc.

Mickey Sartin

Billy Gayle Moon

John Albert Toebes

Arthur Gerald Howarth

James J Miner

Disclosed are methods, computer program products, apparatus, and systems for sending and receiving uniform serial bus ('USB') messages between a host computer and a USB device over a data network, using a USB server in communication with the data network and the host computer, and a USB client in communication with the data network and the USB device. An association is established between the USB server and the USB client. The USB server receives a first USB message from the host computer. The first USB message is translated to a format suitable for sending over the data network, and sent as a first network message from the USB server to the USB client over the data network. The USB server receives a second network message from the USB client over the data network, and translates the second network message to a USB format.

Method and system for sending and receiving USB messages over a data network

Techniques for allocating computing resources to tasks include receiving first data and second data. The first data indicates a limit for unblocked execution by a processor of a set of at least one task that includes instructions for the processor. The second data indicates a maximum use of the processor by the set. It is determined whether a particular set of at least one task has exceeded the limit for unblocked execution based on the first data. If it is determined that the particular set has exceeded the limit, then execution of the particular set by the processor is blocked for a yield time interval based on the second data. These techniques can guarantee that no time-critical tasks of an embedded system on a specific-purpose device are starved for processor time by tasks of foreign applications also executed by the processor.

Techniques for allocating computing resources to applications in an embedded system

A solution is provided for controlling universal serial bus (USB) messages between a plurality of host computers and a USB device. First and second USB servers may communicate with first and second host computers, respectively. A USB client may then communicate with the USB device. A first control path between the USB client and the first USB server and a second control path between the USB client and the second USB server may be established. Then a first data transfer path may be established between the USB client and the first USB server, the first data transfer path enabling the sending of data between the USB client and the first USB server over a data network. Then a busy message may be sent from the USB client to the second USB server over the second control path when the first data transfer path is established with the first USB server.

Method and system for controlling transmission of USB messages over a data network between a USB device and a plurality of host computers

A communications system is provided in which a host may receive data from a slave device over a polling bus. The slave device first reports to the host an initial amount of data to be transferred. The host can then initiate a data transfer from the slave device in order to retrieve the specified amount of data. As that initial data is being transferred over the bus, if additional data to be transferred to the host is received by the slave device, the slave device will report that supplemental amount of data to the host along with the initial data. The host may then immediately schedule a supplemental data transfer from the slave device in order to retrieve the additional data. The slave device may utilize a self-decrementing counter in order to keep track of the packets that require transfer but have not yet been reported to the host. The amount of data reported by the slave device to the host device may be provided as a count of packets in which the packets have a predetermined maximum size.

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Mickey Sartin