Reception according to a data transfer protocol of data directed to any of a plurality of destination entities

• US 9,043,380 B2
• Filed: 07/13/2012
• Issued: 05/26/2015
• Est. Priority Date: 06/15/2005
• Status: Active Grant

• Current Assignee: Xilinx, Inc. (Advanced Micro Devices, Inc.)
• Original Assignee: SolarFlare Communications Incorporated (Advanced Micro Devices, Inc.)
• Inventors: Pope, Steven Leslie, Roberts, Derek Edward, Riddoch, David James, Law, Greg, Grantham, Steve, Slattery, Matthew
• Primary Examiner(s): Park, Jeong S
• Application Number:
  US13/548,308
• Publication Number:
  US 20120296952A1
• Time in Patent Office: 1,047 Days
• Field of Search: 709/201, 710/200, 712200-203
• US Class Current: 709/201
• CPC Class Codes: G06F 13/00 Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units interface circuits for specific input/output devices G06F3/00 ; multiprogram control therefor G06F9/46; multiprocessor systems G06F15/16
• CPC Class Codes: G06F 13/14 Handling requests for interconnection or transfer
• CPC Class Codes: G06F 15/16 Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs coordinating program control therefor G06F9/52; in regulating and control system G05B
• CPC Class Codes: G06F 9/30181 Instruction operation extension or modification
• CPC Class Codes: G06F 9/546 Message passing systems or structures, e.g. queues
• CPC Class Codes: H04L 49/901 using storage descriptor, e.g. read or write pointers
• CPC Class Codes: H04L 49/9094 Arrangements for simultaneous transmit and receive, e.g. simultaneous reading/writing from/to the storage element
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 69/12 Protocol engines
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/162 involving adaptations of sockets based mechanisms secure socket layer H04L63/168
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/325 in the network layer [OSI layer 3], e.g. X.25 H04L69/16 takes precedence

Abstract

A data processing system arranged for receiving over a network, according to a data transfer protocol, data directed to any of a plurality of destination identities, the data processing system comprising: data storage for storing data received over the network; and a first processing arrangement for performing processing in accordance with the data transfer protocol on received data in the data storage, for making the received data available to respective destination identities; and a response former arranged for: receiving a message requesting a response indicating the availability of received data to each of a group of destination identities; and forming such a response; wherein the system is arranged to, in dependence on receiving the said message.

Claims

1. A signal handling method for a processor-based data processing system that has an application having a signal handler, a library and an operating system, the method comprising:

sending an instruction, by a processor, from the application to the operating system to register at the operating system the signal handler within the application, the operating system is capable of being configured to automatically send an asynchronous signal, said asynchronous signal being configured to trigger execution by the signal handler of a signal handler routine, said signal handler routine requiring access to a resource;

intercepting and modifying the instruction at the library, including causing a signal deferral routine to be registered at the operating system instead of the signal handler within the application to cause the asynchronous signal to be sent by the operating system to the library;

determining whether the resource is available by said library being configured in response to receiving said asynchronous signal from the operating system; and

if such determination is negative, delaying passing said asynchronous signal to said signal handler.

2. The method of claim 1 wherein to determine whether the resource is available is in response to a signal from the operating system for initiating execution of the signal handler routine.

3. A data processing system comprising:

a processor;

an application having a signal handler;

a library; and

an operating system, wherein the operating system is capable of being configured to automatically send an asynchronous signal, said asynchronous signal being configured to trigger execution by the signal handler of a signal handler routine, said signal handler routine requiring access to a resource;

wherein said application is configured to send an instruction from the application to the operating system to register at the operating system a signal handler within the application;

said library is configured to intercept and modify the instruction at the library, including causing a signal deferral routine to be registered at the operating system instead of the signal handler within the application to cause the asynchronous signal to be sent by the operating system to the library;

said library is configured in response to receiving said asynchronous signal from the operating system to determine whether the resource is available; and

if such determination is negative, delay passing said asynchronous signal to said signal handler.

4. The data processing system as claimed in claim 3 wherein the library is configured to determine whether the resource is in use by the application or another application.

5. The data processing system as claimed in claim 3 wherein the library is configured to, if the determination is negative, to signal the signal handler when the resource becomes available.

6. The data processing system as claimed in claim 3 comprising a memory location for indicating the availability of the resource, and wherein the said determining comprises accessing the memory location.

7. The data processing system as claimed in claim 6 further arranged to, when a second routine begins, the second routine being such that execution thereof requires access to the resource, the memory location configured to store an indicator of a position in a stack indicating an address to which processing control is to return when the second routine is completed.

8. The data processing system as claimed in claim 7 further arranged to, when the second routine begins, store at the said position in the stack an indicator of an address of a routine for signaling the signal handler routine to initiate execution thereof, whereby the signal handler routine is automatically signaled to initiate execution thereof in response to completion of the second routine.

9. The data processing system as claimed in claim 8 further arranged to, in response to completion of the second routine, store in the memory location an indication that the resource is available.

10. The data processing system as claimed in claim 3 wherein the data processing system implements a user-level networking stack.

11. The data processing system as claimed in claim 10 wherein the user-level networking stack is implemented by means of the library.

12. The data processing system as claimed in any of claim 3 wherein the resource is non-reentrant.

13. The data processing system of claim 3 wherein to determine whether the resource is available is in response to a signal from the operating system for initiating execution of the first routine.

14. One or more non-transitory computer readable media storing instructions that are executable by a data processing system that has an application having a signal handler, a library, and an operating system and upon such execution cause the data processing system to perform operations comprising:

sending an instruction from the application to the operating system to register at the operating system the signal handler within the application, the operating system is capable of being configured to automatically send an asynchronous signal, said asynchronous signal being configured to trigger execution by the signal handler of a signal handler routine, said signal handler routine requiring access to a resource;

intercepting and modifying the instruction at the library, including causing a signal deferral routine to be registered at the operating system instead of the signal handler within the application to cause the asynchronous signal to be sent by the operating system to the library;

determining whether the resource is available by said library being configured in response to receiving said asynchronous signal from the operating system; and

if such determination is negative, delaying passing said asynchronous signal to said signal handler.

15. The one or more non-transitory computer readable media of claim 14 wherein to determine whether the resource is available is in response to a signal from the operating system for initiating execution of the first routine.