Multi-process communication method based on shared memory backup mechanism

Abstract

The invention relates to a multi-process communication method based on a shared memory backup mechanism. The method comprises the following steps: receiving communication character string data and a data cache length; performing hash value calculation processing according to the communication character string data, and opening up N shared memory blocks with the same storage space according to a hash value and a data cache length sequence; enabling the write process to sequentially query the state information of each shared memory block according to the index address; when the shared memory blocks are in an idle state or a write-in state, enabling the write process to point a write data pointer to the shared memory blocks until all the shared memory blocks are fully written, and enabling the write process to point the write data pointer to the first shared memory block; meanwhile, enabling the reading process to sequentially query the state information of each shared memory block according to the index address; when the shared memory block is in an idle state or a read state, enabling the read process to point a read data pointer to the shared memory block, and reading write-in data in the shared memory block and / or a pointer address of the read data pointer.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a multi-process communication method based on a shared memory backup mechanism. Background technique [0002] An automatic driving system is usually composed of multiple modules, including but not limited to a positioning module, a perception module, a decision planning module, a map engine module, and a middleware module. In addition to working independently, each module also needs the assistance of other modules. Regardless of whether it is from the perspective of the safety of autonomous driving, the performance requirements of autonomous driving, or the perspective of fluency, the cooperation and cooperation between the various modules of autonomous driving have high requirements for the real-time performance of the automatic driving system. [0003] In the automatic driving system, when different nodes communicate and require real-time communication, shared memory is ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-process communication method based on a shared memory backup mechanism for the defects of the prior art, which solves the problem that shared resources cannot realize resource mutual exclusion under multi-user status, and under multi-module blocking status, communication The problem of reduced efficiency

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