Bus type inter-process communication method

Abstract

A bus type process to process communication method which combines shared internal memory technique and signal lamp integration technique, wherein a shared internal memory area is arranged in the internal memory, the area is divided into a plurality of internal memory slots, among which one is used as the status sign character set storage area, and the rest are used as the process communication data storage area, the internal memory slots are classified into a plurality of groups, each group has different access key number, a signal lamp aggregation is established which contains the same number of signal lamps as the number of the internal memory slots group, then the state sign character initial value and the signal lamp initial value and internal memory slot initial value are set.

Description

technical field [0001] The invention relates to a bus-type inter-process communication method, in particular to a bus-type inter-process fast communication method under Unix or Linux. Background technique [0002] "Process communication" is an indispensable function in large and medium-sized computer application systems, and data exchange between two mutually independent application programs (or task TASK) can be realized through process communication. [0003] In the early process control level computers, data exchange between processes generally uses disk queue files, or even simple disk data files (for the convenience of description, these two files are collectively referred to as "disk files" below) to achieve inter-process data exchange. data exchange. It should be said that disk files are a desirable way to achieve inter-process communication, but this technology is a product of a specific period. With the continuous acceleration of computer operation speed, the requ...

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Problems solved by technology

[0004] (1) The disk file data exchange method is only suitable for occasions where the data exchange rate is not too high, because the I / O to the disk cannot keep up with the CPU rate

[0005] (2) Because the system resources are limited, the problem of file lock management cannot be avoided when using disk files and the data exchange rate is fast; however, the management of file locks is more complicated, and the result is often to reduce the data exchange rate index instead of Bypass file locks

[0006] (3) Because the disk file processing speed cannot be too fast, even if the performance of computer hardware equipment is greatly improved, it cannot fundamentally change the reality that the disk I / O rate is far behind the CPU rate, so the inter-process of the disk file method Data exchange often becomes the bottleneck for the overall improvement of the data exchange rate of the entire application system

[0007] At present, in many application software at home and abroad, memory technology (including shared memory ShareMemory, memory queue MemoryQueue, semaphore, etc.) has been widely used instead of disk file technology to achieve fast data exchange, but there is no fast data exchange between processes. It is a widely versatile and easy-to-use Package (software package) developed for exchange. In fact, in large and medium-sized application systems in the fields of metallurgy, energy, manufacturing, etc., there is a wide demand for fast data exchange functions between processes.

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