System and method for real-time control of hardware in a multiprocessing environment

• US 5,842,015 A
• Filed: 07/26/1996
• Issued: 11/24/1998
• Est. Priority Date: 07/26/1996
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Gee, J. Norman, Cunniff, Ross
• Primary Examiner(s): BANANKHAH, MAJID A
• Application Number:
  US08/690,425
• Time in Patent Office: 851 Days
• Field of Search: 395/674, 395/726, 395/670, 395/672, 395/673, 711/148, 380/25
• US Class Current: 718/104
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores

Abstract

A hardware resource manager for real-time control of a hardware resource in a multiprocessing environment is disclosed. The hardware resource manager performs control and management functions for a limited hardware resource that can be accessed by multiple asynchronous application programs in order to achieve real-time response by the limited hardware resource. The hardware resource manager of the present invention comprises a shared memory buffer and a resource daemon. The shared memory buffer provides for semaphore locking capability so that only one application program may control the hardware resource manager at a time, and virtual memory capability for storing data and command information from the application programs. The resource daemon provides interpretation and processing capability for controlling the limited hardware resource via the data and command information received from the shared memory buffer. In addition, the daemon provides operational functionality that is matched to the type of limited hardware resource with which the hardware resource manager is associated, such as audio hardware or texture mapping hardware.

Claims

1. A hardware resource manager for providing real-time control over a limited hardware resource in a computer system capable of running asynchronous application programs, comprising:

a shared memory buffer residing within said computer system for storing command and data information from one of said application programs, and a semaphore mechanism for restricting access to said shared memory buffer to one said application program at a time, said application program residing within said computer system; and

a resource daemon residing within said computer system for receiving command and data information from said shared memory buffer, and for interpreting and processing said command and data information to control operation of said limited hardware resource within said computer system.

2. The hardware resource manager of claim 1, further comprising socket connections interconnecting said application programs to said resource daemon.

3. The hardware resource manager of claim 1 wherein said limited hardware resource is audio hardware.

4. The hardware resource manager of claim 1, wherein said limited hardware resource is texture mapping hardware.

5. The hardware resource manager of claim 1, wherein each said application program is provided with an application program interface (API) suitable for communicating with said hardware resource manager.

6. The hardware resource manager of claim 1, wherein said resource daemon includes a command interpreter for interpreting said command and data information into executable instructions.

7. The hardware resource manager of claim 1, wherein said shared memory buffer is implemented in virtual memory space.

8. The hardware resource manager of claim 2, wherein said, socket connections are utilized to communicate a termination of one said application programs to said resource daemon, and to communicate a termination of said resource daemon to said application programs.

9. The hardware resource manager of claim 3, wherein said shared memory buffer includes a command field buffer for storing said command information, an attribute field buffer for storing attributes associated with said command information, and a send buffer for storing said data information.

10. The hardware resource manager of claim 3, wherein said resource daemon includes a command interpreter for interpreting said command information, a defined sounds list for storing defined sounds, an active list for storing a list of sounds to be play in a particular slice of time, a streamed sound buffer for storing streamed sound data, and a sound mixer for mixing sounds.

11. The hardware resource manager of claim 4, wherein said shared memory buffer includes a command field for storing said command information, and a texture data buffer for storing texture data associated with said command information.

12. The hardware resource manager of claim 4, wherein said resource daemon includes a command interpreter for interpreting said command information, a texture list for storing texture data, a hardware block list for mapping texture data in said texture list to storage locations in said texture mapping hardware, and an interrupt service manager for downloading said texture data from said texture list to said texture mapping hardware according to mapping of said hardware block list.

13. A method for providing real-time control over a limited hardware resource in a computer system capable of running multiple, asynchronous application programs, said method comprising the steps of:

receiving command and data information from said application program residing within said computer system;

storing said command and data information in a shared memory buffer residing within said computer system;

transferring said command and data information from said shared memory buffer to a resource daemon residing within said computer system;

interpreting said command information into executable instructions by said resource daemon for enabling real-time control of said limited hardware resource within said computer system; and

processing said instructions by said resource daemon, including providing said limited hardware resource with said data information as needed for operation of said limited hardware resource;

whereby each of said application programs is able to control operation of said limited hardware resource within said computer system in substantially real-time fashion.

14. The method of claim 13, wherein said command and data information is transferred to said resource in an order received by said shared memory buffer.

15. The method of claim 13, further including the step of communicating a termination of one of said application programs to said resource daemon via a socket connection.

16. The method of claim 13, further including the step of protecting said shared memory buffer with a semaphore mechanism that prevents more than one of said application programs writing to said shared memory buffer at a time.

17. The method of claim 13, wherein said shared memory buffer is implemented in virtual memory space.

18. A computer program for providing real-time control over a limited hardware resource in a computer system capable of running asynchronous application programs, said computer program comprising:

shared memory buffer means residing within said computer system for storing command and data information from one of said application programs, and a semaphore mechanism for restricting access to said shared memory buffer to one of said application programs at a time, said application program located within said computer system; and

resource deamon means located within said computer system for receiving command and data information from said shared memory buffer means, and for interpreting and processing said command and data information to control operation of said limited hardware resource within said computer system.