RTEMS Logo

RTEMS 4.6.0pre5 On-Line Library


Miscellaneous Support Files Calling Overhead File

PREV UP NEXT Bookshelf BSP and Device Driver Development Guide

5.6: Calling Overhead File

The file include/coverhd.h contains the overhead associated with invoking each directive. This overhead consists of the execution time required to package the parameters as well as to execute the "jump to subroutine" and "return from subroutine" sequence. The intent of this file is to help separate the calling overhead from the actual execution time of a directive. This file is only used by the tests in the RTEMS Timing Test Suite.

The numbers in this file are obtained by running the "Timer Overhead" tmoverhd test. The numbers in this file may be 0 and no overhead is subtracted from the directive execution times reported by the Timing Suite.


PREV UP NEXT Bookshelf BSP and Device Driver Development Guide

Copyright © 1988-2003 OAR Corporation