Scott M Robbins

US Patent:

7171501, Jan 30, 2007

Filed:

Oct 23, 2002

Appl. No.:

10/279168

Inventors:

Gregory Bollella - Palo Alto CA, US
Benjamin M. Brosgol - Belmont MA, US
Scott D. Robbins - Pittsburgh PA, US
David S. Hardin - Cedar Rapids IA, US
Peter Dibble - Bethel Park PA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F 13/24

US Classification:

710261, 710260, 710240

Abstract:

An invention is provided for a synchronous transfer of control. An asynchronous interrupt exception is received, and in response, the value of a reference counter is determined. The value of the reference counter is based on the execution of synchronized code. Generally, the reference counter is initialized to a predetermined number, and altered based on the execution of synchronized code. When the asynchronous interrupt exception is received, the method is asynchronously interrupted when the value of the reference counter is equal to the predetermined number.

US Patent:

7296257, Nov 13, 2007

Filed:

Aug 1, 2002

Appl. No.:

10/211933

Inventors:

Peter C. Dibble - Bethel Park PA, US
C. Douglass Locke - Mt. Lebanon PA, US
Scott D. Robbins - Pittsburgh PA, US
Pratik Solanki - Pittsburgh PA, US

Assignee:

TymeSys Corporation - Pittsburgh PA

International Classification:

G06F 9/45
G06F 9/44
G06F 11/00

US Classification:

717127, 717139, 712244, 714 38, 710262

Abstract:

A technique for implementing a data processor to determine if an exception has been thrown. Specifically, the technique may be used in an interpretive environment where a table known as a bytecode (upcode) dispatch table is used. The dispatch table contains addresses for code that implements each bytecode. When the interpreter executes normally, these addresses point to the basic target machine code for executing each bytecode. However, when an Asynchrounously Interrupted Exception (AIE) is thrown, then the dispatch table is repopulated so that all byte codes point to routines that can handle the exception. These may point to a routine, such as an athrow, that has been extended to handle the special case of the AIE. Alternatively, the rewritten table can point to a routine that is specifically written to handle the firing of an AIE. The table contents are restored to their prior state once the exception handling is complete.

US Patent:

20030097537, May 22, 2003

Filed:

Oct 23, 2002

Appl. No.:

10/279348

Inventors:

Gregory Bollella - Palo Alto CA, US
Scott Robbins - Pittsburgh PA, US
David Hardin - Cedar Rapids IA, US
Benjamin Brosgol - Belmont MA, US
Peter Dibble - Bethel Park PA, US
Pratik Solanki - Pittsburgh PA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F012/00
G06F017/30

US Classification:

711/170000, 707/206000

Abstract:

An invention is provided for managing memory that includes a heap memory and scoped memory. The scoped memory is managed separately from the heap memory, and includes defining a scope tree structure having a root node and a plurality of child nodes. The child nodes are capable of having respective child nodes, however each child node has only one parent node. Each child node corresponds to a scoped memory space that forms a logical memory pool corresponding to a particular scoped memory. During memory management, a thread is allowed to enter a particular child node only through the parent node of the particular child node. In this manner, a thread executing in a particular scooped memory space allocates memory from the scoped memory corresponding to the particular scoped memory space.