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Linux, Real-Time Linux, & IPC

By Frederick M. Proctor, November 01, 1999

When dealing with real-time systems, IPC overhead becomes important. Fred examines two of the best IPC mechanisms available under Linux -- FIFO and shared memory.
Nov99: Linux, Real-Time Linux, & IPC 


<b>(a)</b>
#include "myheader.h" 
MY_STRUCT *ptr; 
ptr = (MY_STRUCT *) BASE_ADDRESS; 
ptr->command.arg1 = 1; 
ptr->command.arg2 = 2; 

<b>(b)</b>
ptr = (MY_STRUCT *) __va(BASE_ADDRESS)

Example 4: (a) In Linux kernels 2.0.XX, the pointer can be set directly; (b) in Linux kernels 2.1.XX, the pointer needs to be mapped via a call to the __va() macro.

Copyright © 1999, Dr. Dobb's Journal


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