The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 1996
Filed:
Jan. 28, 1994
Harry M Mathis, Flower Mound, TX (US);
Shrikant N Parikh, Mesquite, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for subdividing a thread's processing cycles among a set of threadlets or regions within a thread or process. This is achieved through instructions in the application code which are interpreted by the operating system. The beginning and ending of a threadlet is through the 'Begin Threadlet' and 'End Threadlet' instructions. A segmented stack is utilized to separately hold that part of the stack belonging to each threadlet. The programmer must know within the application code places where the data contents of the registers do not merit saving or is saved in memory. This provides the user with an opportunity to switch to a different activity without saving registers. The user identifies this to the operating system by a special instruction called 'SWITCHIR'. The SWITCHIR instruction tells the operating system not to save registers. Therefore, within the same thread, the operating system will keep on executing a threadlet until it encounters this instruction. Upon encountering the SWITCHIR instruction, the operating system will save the program counter and stack pointer in a threadlet control block and execute subsequently encountered threadlets.