Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!usc!elroy.jpl.nasa.gov!news.larc.nasa.gov!hal.larc.nasa.gov!alan
From: alan@hal.larc.nasa.gov (alan dare)
Newsgroups: comp.sys.sgi
Subject: mpin and function length
Message-ID: <1991Jun19.172430.5654@news.larc.nasa.gov>
Date: 19 Jun 91 17:24:30 GMT
Sender: news@news.larc.nasa.gov (USENET Network News)
Organization: NASA Langley Research Center, Hampton, VA  USA
Lines: 29
Originator: alan@hal.larc.nasa.gov



Irix'ers,

	I have been looking at some of the "REACT" features and the demo
program in section 14 volume II of the Iris-4D Programmers Guide. The program
pins the signal handler into memory. Seems like a good idea. To find the
length of the signal handling function the following is done during pinning:

	mpin((char *)catcher, (int)pinmem - (int)catcher);

	In the source code pinmem() is directly after catcher(). Thus, the 
size of the function is found. I would like to pin my signal handler in 
memory, but I have some questions about finding the function length. If i'm 
using O3 optimization or a Power compiler I think the locations of the 
functions could be changed (Correct ?). The problem could also arise if
an engineer after me mods the program and changes the function location.
I would like to find another solution to dynamicly determine the function
length, but I don't know how.

	If I am off base here, please tell me what i'm missing. If not, anyone
have any good ideas?

Thanks
-- 

*********************************************************************
Alan Dare                     |  Internet : alan@hal.larc.nasa.gov
NASA Langley Research Center  |