Method and apparatus for asynchronously reading and writing data

Details Method and apparatus for asynchronously reading and writing data Method and apparatus for asynchronously reading and writing data

1997-08-22

2000-12-12

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

711152, 711168, 711151, G06F 1200

Patent

active

061611697

ABSTRACT:
A method, apparatus, and article of manufacture for asynchronously writing and reading multiple data streams is disclosed. The method comprises the steps of writing a plurality of data sub-streams into shared memory buffers asynchronously and in parallel using a write process for each data stream, reading the plurality of data sub-streams from the shared memory buffers asynchronously and in parallel using a read process for each data sub-stream, and writing the data sub-stream into the storage device. Data passing between the write processes and the read processes are stored in a plurality of shared memory buffers, with access to the shared memory buffers controlled by semaphores. The semaphores are used to write-block a shared memory buffer to render the buffer inaccessible to other write processes, to write-unblock a next available shared memory buffer to render it available to a next write process, to read-block the shared memory buffer, to write the data sub-stream to the shared memory buffer, and to read-unblock the shared memory buffer. This allows the bandwidth of the storage devices to be more fully utilized, and improves I/O throughput. The apparatus comprises a system for performing these operations, and the article of manufacture comprises a computer-readable program storage medium tangibly embodying the above method steps.

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