# US 8,572,617 B2 · Processor-implemented systems and methods for event handling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,572,617 B2 - Document ID: US8572617B2 - Status: Granted - Kind: B2 - Application number: 12/506,718 - Filed: 2009-07-21 - Published: 2011-01-27 - Granted: 2013-10-29 - Earliest claimed: 2009-07-21 - Assignees: SAS Institute Inc. - Applicants: Charles Scott Shorb - Inventors: Charles Scott Shorb - Web page: https://patentgrep.com/patent/US8572617B2 ## CPC - G06F 9/522: {Barrier synchronisation} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Processor-implemented systems and methods are provided for synchronization of a thread, wherein the thread waits for one or more events to occur before continuing execution. A processor-implemented system and method can include a wait data structure which stores event conditions in order to determine when the thread should continue execution. Event objects, executing on one or more data processors, allow for thread synchronization. A pointer is stored with respect to a wait data structure in order to provide visibility of event conditions to the event objects. The thread continues execution when the stored event conditions are satisfied. ## Claims ### Claim 1 A computer-implemented method, comprising: initializing a group of multiple threads in a computer system, wherein the group of multiple threads execute in a multi-thread environment; synchronizing the group of multiple threads by restricting one thread of the group from executing until multiple event conditions are satisfied, wherein each of the multiple event conditions corresponds to a different one of the multiple events; initializing multiple event objects, wherein each of the multiple event objects stores information about a different one of the multiple events and a corresponding event condition, and wherein each of the multiple event objects is associated with multiple methods including a wait method for updating and accessing the event condition information stored by the object; registering the multiple event objects, wherein registering an event object includes using the wait method to perform a wait operation to determine a status of an event by referencing an event condition information corresponding to the event stored by the event object and generating and storing a pointer associated with the event object; initializing a wait data structure, wherein the wait data structure holds a counter, wherein the counter is configured to indicate when all of the multiple event conditions are satisfied, and wherein initializing includes linking a pointer to the wait data structure; associating the one restricted thread of the group with the wait data structure; updating the counter when an event condition is satisfied; determining that all of the multiple event conditions are satisfied when the counter value reaches zero; and in response to determining that all of the multiple event conditions are satisfied, ceasing to restrict the one thread of the group from executing. ### Claim 2 (depends on 1) The method of claim 1, wherein storing a pointer provides visibility of an event condition corresponding to an event, and wherein the visibility is provided to an event object corresponding to the event. ### Claim 3 (depends on 1) The method of claim 1, wherein synchronizing the group of multiple threads is done without an operating system lock. ### Claim 4 (depends on 1) The method of claim 1, wherein each of the multiple event objects further includes a method for clearing event information at the event object. ### Claim 5 (depends on 1) The system of claim 1, wherein each of the multiple event objects further includes a post method. ### Claim 6 (depends on 1) The method of claim 1, wherein the events are asynchronous events. ### Claim 7 A system, comprising: one or more data processors; and one or more non transitory computer-readable storage media containing instructions configured to cause the one or more processors to perform operations including: initializing a group of multiple threads in a computer system, wherein the group of multiple threads execute in a multi-thread environment; synchronizing the group of multiple threads by restricting one thread of the group from executing until multiple event conditions are satisfied, wherein each of the multiple event conditions corresponds to a different one of the multiple events; initializing multiple event objects, wherein each of the multiple event objects stores information about a different one of the multiple events and a corresponding event condition, and wherein each of the multiple event objects is associated with multiple methods including a wait method for updating and accessing the event condition information stored by the object; registering the multiple event objects, wherein registering an event object includes using the wait method to perform a wait operation to determine a status of an event by referencing an event condition information corresponding to the event stored by the event object and generating and storing a pointer associated with the event object; initializing a wait data structure, wherein the wait data structure holds a counter, wherein the counter is configured to indicate when all of the multiple event conditions are satisfied, and wherein initializing includes linking a pointer to the wait data structure; associating the one restricted thread of the group with the wait data structure; updating the counter when an event condition is satisfied; determining that all of the multiple event conditions are satisfied when the counter value reaches zero; and in response to determining that all of the multiple event conditions are satisfied, ceasing to restrict the one thread of the group from executing. ### Claim 8 (depends on 7) The system of claim 7, wherein storing a pointer provides visibility of an event condition corresponding to an event, and wherein the visibility is provided to an event object corresponding to the event. ### Claim 9 (depends on 7) The system of claim 7, wherein synchronizing the group of multiple threads is done without an operating system lock. ### Claim 10 (depends on 7) The system of claim 7, wherein each of the multiple event objects further includes a method for clearing event information at the event object. ### Claim 11 (depends on 7) The system of claim 7, wherein each of the multiple event objects further includes a post method. ### Claim 12 (depends on 7) The system of claim 7, wherein the events are asynchronous events. ### Claim 13 A computer-program product tangibly embodied in a non-transitory machine readable storage medium, and including instructions configured to cause a data processing apparatus to perform operations including: initializing a group of multiple threads in a computer system, wherein the group of multiple threads execute in a multi-thread environment; synchronizing the group of multiple threads by restricting one thread of the group from executing until multiple event conditions are satisfied, wherein each of the multiple event conditions corresponds to a different one of the multiple events; initializing multiple event objects, wherein each of the multiple event objects stores information about a different one of the multiple events and a corresponding event condition, and wherein each of the multiple event objects is associated with multiple methods including a wait method for updating and accessing the event condition information stored by the object; registering the multiple event objects, wherein registering an event object includes using the wait method to perform a wait operation to determine a status of an event by referencing an event condition information corresponding to the event stored by the event object and generating and storing a pointer associated with the event object; initializing a wait data structure, wherein the wait data structure holds a counter, wherein the counter is configured to indicate when all of the multiple event conditions are satisfied, and wherein initializing includes linking a pointer to the wait data structure; associating the one restricted thread of the group with the wait data structure; updating the counter when an event condition is satisfied; determining that all of the multiple event conditions are satisfied when the counter value reaches zero; and in response to determining that all of the multiple event conditions are satisfied, ceasing to restrict the one thread of the group from executing. ### Claim 14 (depends on 13) The computer-program product of claim 13, wherein storing a pointer provides visibility of an event condition corresponding to an event, and wherein the visibility is provided to an event object corresponding to the event. ### Claim 15 (depends on 13) The computer-program product of claim 13, wherein synchronizing the group of multiple threads is done without an operating system lock. ### Claim 16 (depends on 13) The computer-program product of claim 13, wherein each of the multiple event objects further includes a method for clearing event information at the event object. ### Claim 17 (depends on 13) The computer-program product of claim 13, wherein each of the multiple event objects further includes a post method. ### Claim 18 (depends on 13) The computer-program product of claim 13, wherein the events are asynchronous events.