Efficient sampling port buffer management method

Abstract

An efficient sampling port buffer management method, including: 1) When the sampling port is initialized; 2) When the source port writes data, write the data into the buffer pointed to by the temporary pointer; 3) After the data is written, exchange the pointer The pointers of the two buffers update the write buffer counter at the same time, and add 1 to the count value of the write buffer counter; 4) When reading data from the source port, first save the count value of the write buffer counter, and then start from the valid pointer Read the data in the buffer, compare it with the count value of the latest write buffer counter after reading, and judge whether the count value of the write buffer counter has changed; if so, repeat step 4) until the count value of the write buffer counter does not change. Change occurs; if not, the reading is complete; 5) Send and read messages by calling the sampling port. The invention provides an efficient sampling port buffer management method which can improve the communication efficiency of the sampling port.

Description

technical field [0001] The invention belongs to the technical field of computer software control, and relates to a high-efficiency sampling port buffer management method. Background technique [0002] In order to meet the requirements of modularized and integrated avionics IMA system, a multi-partition operating system has emerged. The salient feature of a multi-partition operating system is that each partition is isolated from each other in space and time. Inter-partition communication is the main way to achieve information exchange between partitions. The sampling port is an important communication method for inter-partition communication. The function of the sampling port It is required to maintain only one message. When the source port writes a message, no matter whether the previously written message is read or not, the new message will overwrite the previous message; the destination port only reads the most recently arrived message. The sampling port needs to support ...

AI Technical Summary

Problems solved by technology

The disadvantage of this mutual exclusion operation is that if the message load is relatively large or the time window of the partition is relatively small, if the port access port is not completed in the current time window, due to the mutual exclusion operation added to the shared buffer, it will As a result, the destination ports of other partitions cannot complete the access to the port within the partition time, which will affect the accessibility of the ports at any time, and also reduce the communication efficiency.

[0004] In order to reduce the performance problems caused by mutual exclusion operations, according to the idea of ​​exchanging space for time, one way is to add a buffer for each destination port, so that each destination port does not need to communicate with other N-1 destination ports. repulsion, but the problem is that the number of underlying message copies of the message will increase N times, and there is still a mutual exclusion operation between the source port and one destination port, which will bring a large performance loss

[0005] If new messages are written in the process of reading messages and need to be read again, the performance of the above two methods will be further degraded

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