Hi,
Please find an archive attached, containing :
- a program for testing context-switch-latency using posix-APIs
for native linux kernel and xenomai-posix-skin (userspace).
- Makefile to build it using xenomai
In brief, the attempt is to spawn a bunch of pthreads, which share pairs
of read-write pthread-mutexes in a circular fashion, as shown below, and
measure the time taken for to complete a (rel_mtx_0 - acq_mtx_n) by
pthread_0
( - threads try to acquire read mutexes and release write_mutexes)
pthread_0:write_mtx = pthread_1:read_mtx
pthread_1:write_mtx = pthread_2:read_mtx
..
pthread_(n-1):write_mtx = pthread_1:write_mtx
pthread_n:write_mtx = pthread_0:read_mtx
The program runs fine on native linux userspace (ARM, x86) , but the
in the xenomai-space, threads lock up at trying to acquire their respective
read_mutexes.
A similar attempt using message-queues runs fine.
Am running a version between 2.5.2 and 2.5.3.
Will try to check with 2.5.3 as well.
Following is my current xeno-config
# ./xeno-config
xeno-config --verbose
--version="2.5.2"
--cc="arm-linux-gcc"
--arch="arm"
--prefix="/opt/xeno_utils"
--xeno-cflags="-I/opt/xeno_utils/include -D_GNU_SOURCE -D_REENTRANT
-Wall -pipe -D__XENO__"
--xeno-ldflags="-L/opt/xeno_utils/lib -lxenomai -lpthread "
--posix-cflags=""
--posix-ldflags="-Wl,--wrap,pthread_create
-Wl,--wrap,pthread_setschedparam -Wl,--wrap,"
context_switch_latency.tgz
Description: GNU Zip compressed data
___
Xenomai-core mailing list
Xenomai-core@gna.org
https://mail.gna.org/listinfo/xenomai-core
