On Fri, 17 Nov 2000, Alexander Lichius wrote:
> i tried to use c++ because i wanted to estimate the performance of
> plain C code and some C++ "object oriented" code. but my humble trials
> were killed at compile time. i think the macros for using module
> parameters are not defined in the g++ standard include files and i
> didn't have the time to track down the definition in the C includes.
Hi Alexander and Jef,
I think they are defined in linux/module.h
I have tried to compile a module in C++, but some of the necessary
kernel module #include files use C++ reserved words as variable names.
e.g., there is a variable called "new" (it is C, not C++, so it is ok)
therefore, I could not compile C++ directly, but I did this way
(skeleton code, missing many details):
file module_main_file.c (C, not C++, gcc, not g++)
#define MODULE
#define __KERNEL__
#define __RT__
...
#include <rtl_sched.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include "wrapper.c"
...
int init_module() {
...my rt stuff initilization, etc...
pthread_create (&mytask, NULL, execute_module, (void *) 1);
pthread_make_periodic_np (mytask, now + 0.5 * NSECS_PER_SEC, 0.1 *
NSECS_PER_SEC);
wrapper_init();
}
void* execute_module(void *data){
while(1){
wrapper_do();
pthread_wait_np();
}
}
void cleanup_module() {
wrapper_close();
pthread_delete_np (mytask);
}
----------------end of file
file wrapper.cc
MYMAINOBJECT myobj;
void wrapper_init() { myobj.init(); }
void wrapper_do() { myobj.do(); }
void wrapper_close() { myobj.close(); }
this file I can compile with g++, and link with my c++ .o files.
then I link this .o file with the main module .o file and... voilla! my
c++ code works!
Interesting: I use rtlinux 2.0, but with rtlinux 0.6 and linux
2.0.33 I do not need this stuff: the main module can call my object and be
compiledwith g++, no problem.
> so i didn't bother about C++ but wrote my tasks in C.
> did you or anybody else compiled some working C++ kernel modules?
I know C++ is not supported in the kernel, and many people do not like
to hear "c++ and kernel", but c++ can be still worth...
-----------------------------------------------------------
Luiz Gustavo Bizarro Mirisola
Mestrando em Ciencia da Computacao - IC-Unicamp/LRV-IA-CTI
MSc Student in Computer Science
State University of Campinas, Brazil
[EMAIL PROTECTED]
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