File system locking

A computer program product embodied in a machine readable medium, including programming for a computer system, comprising a program of instructions for performing the method steps of:

• sending application program file requests from an application program to a file request emulator, said file request emulator comprising an application program interface and a file lock supervisor;
• converting said application program file requests to a set of compatible operating system file requests and file lock query commands;
• creating file lock managers by said file lock supervisor for each file accessed by said operating system;
• storing file lock information about each of said accessed files in a corresponding one of said file lock managers;
• checking the validity of application program file requests in said file lock supervisor;
• and
• sending compatible application program application program file requests to said operating system for execution.

A system for managing process requests between an application program and an operating system program comprising:

• a file request circuit operable for sending application program file request commands from said application program to a file request emulator;
• said file request emulator comprising application program interface circuits and file lock supervisor circuits;
• a file request conversion circuit operable for receiving said application program file request commands and converting said application program file request commands to a set of compatible operating system file request commands and file lock query commands;
• programmable file lock manager circuits operable to be programmed by said file lock supervisor to create file lock managers for each file accessed by said operating system;
• file lock storage circuits in each of said file lock managers operable to store the file lock status of each of said accessed files in a corresponding one of said file lock managers;
• a file request validity circuit in said file lock supervisor circuit operable to compare each of said application program file requests to a set of compatible requests;
• and
• a sending circuit operable for sending compatible application program file request commands to said operating system for execution.

A data processing system, comprising:

• a central processing unit (CPU);
• shared random access memory (RAM);
• read only memory (ROM);
• an I/O adapter;
• and
• a bus system coupling said CPU to said ROM, said RAM said display adapter,
• wherein said CPU further comprises:
• a file request circuit operable for sending application program file request commands from an application program to a file request emulator, said file request emulator comprising application program interface circuits and a file lock supervisor circuits;
• a file request conversion circuit operable for receiving said application program file request commands and converting said application program file request commands to a set of compatible operating system file request commands and file lock query commands;
• programmable file lock manager circuits operable to be programmed by said file lock supervisor to create file lock managers for each file accessed by an operating system;
• file lock storage circuits in each of said file lock managers operable to store the file lock status of each of said accessed files in a corresponding one of said file lock managers;
• a file request validity circuit in said file lock supervisor circuit operable to compare each of said application program file requests to a set of compatible requests;
• and
• a sending circuit operable for sending compatible application program file request commands to said operating system for execution.