BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom [Thomas Lehwald <thomas.lehwald@Ruetz.de>] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Wed May 30 06:20:13 2001
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From: Thomas Lehwald <thomas.lehwald@Ruetz.de>
To: rtl@fsmlabs.com
Subject: misbehavior of rtl_printf()
Date: Wed, 30 May 2001 14:07:59 +0200
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Hi all,

I have an additional test performed: The conditions and the result are
below. The "Diff" is that, that I expect, but whats about the doubled output
of the same variable (t1 and t2)??. Depends this on the %Ld formatter ????
I'm not sure. Has anybody an explanation for this?? In addition seen the
negative output (section DMESG).

Thanks

Thomas


------------------ Module Code -------------------------

#include <rtl.h>
#include <time.h>
#include <pthread.h>

static pthread_t thread;

static void * start_routine(void *arg)
{
	int i;
	hrtime_t t1;
	hrtime_t t2;
        hrtime_t diff;

	struct sched_param p;
	p . sched_priority = 1;
	pthread_setschedparam (pthread_self(), SCHED_FIFO, &p);

	rtl_printf("RTLinux thread starts on CPU%d\n", rtl_getcpuid());

	for (i = 0; i < 100; i++) {
                t1 = gethrtime();
	        rtl_printf("Before Sleep: gethrtime()=[%Ld][%Ld]\n", t1,t1);
                usleep(500000);
		t2 = gethrtime();
                rtl_printf("After Sleep:  gethrtime()=[%Ld][%Ld]\n", t2,t2);
		diff = t2 - t1;
		rtl_printf("Diff=[%Ld]\n", diff);
	}
	return (void *) 0;
}


int init_module(void)
{
	int ret;
	pthread_attr_t attr;

	pthread_attr_init (&attr);

	ret = pthread_create (&thread, &attr, start_routine, 0);
	if (ret) {
		rtl_printf("failed to create a thread\n");
		return ret;
	}

	return 0;
}


void cleanup_module(void)
{
	pthread_delete_np (thread);
}


-------------- Makefile -------------------------------
ALL= test.o


CC 			 = gcc

USER_CFLAGS = -O2 -Wall

RTL_FLAGS	= `rtl-config --cflags`
RTL_INCL	= /usr/include/rtlinux
	
all : $(ALL)

test.o:	test.c
	$(CC) -c $(RTL_FLAGS) -I$(RTL_INCL) $<

clean:
	rm -f *.o

---------------- DMESG Output -------------------------------
RTLinux thread starts on CPU0
Before Sleep: gethrtime()=[1342973024][823]
After Sleep:  gethrtime()=[1842995584][823]
Diff=[500022560]
Before Sleep: gethrtime()=[1843014144][823]
After Sleep:  gethrtime()=[-1951933984][823]
Diff=[500019168]
Before Sleep: gethrtime()=[-1951919584][823]
After Sleep:  gethrtime()=[-1451899328][823]
Diff=[500020256]
Before Sleep: gethrtime()=[-1451883744][823]
After Sleep:  gethrtime()=[-951864864][823]
Diff=[500018880]
Before Sleep: gethrtime()=[-951849792][823]
After Sleep:  gethrtime()=[-451824448][823]
Diff=[500025344]
Before Sleep: gethrtime()=[-451803584][823]
After Sleep:  gethrtime()=[48217120][824]
Diff=[500020704]
Before Sleep: gethrtime()=[48235104][824]
After Sleep:  gethrtime()=[548257280][824]
Diff=[500022176]
----------------------------------------------------------------------------
------

**************************************************************
Dipl.-Ing. (FH) 
Thomas Lehwald
RUETZ Technologies		Tel:   089 / 3 56 10 - 268
Abteilung E-Technik			Fax:  089 / 3 56 10 - 111
Ingolstaedter Strasse 18		80807 Muenchen
email: thomas.lehwald@ruetz.de
****************************************************