* Mode Switch
@ 2021-02-15 13:00 Leandro Bucci
[not found] ` <358306354.8105980.1613394904650.JavaMail.zimbra@wolfram.com>
0 siblings, 1 reply; 12+ messages in thread
From: Leandro Bucci @ 2021-02-15 13:00 UTC (permalink / raw)
To: xenomai
hi, I can't understand why if I use the memcpy function on Xenomai I don't
have any mode switch. Is there a function that copies two arrays and
generates a mode switch?
^ permalink raw reply [flat|nested] 12+ messages in thread* Mode Switch
@ 2021-01-03 20:29 Leandro Bucci
2021-01-03 22:00 ` steve freyder
0 siblings, 1 reply; 12+ messages in thread
From: Leandro Bucci @ 2021-01-03 20:29 UTC (permalink / raw)
To: xenomai
Hi, I have a strange behavior regarding the "mode switch".
In the attached code, the task should never switch to the Linux domain, but
instead I have a value of MSW = 2.
How is it possible?
Even if I do a printf in the task I always get MSW = 2.
I can't understand where the problem is.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <alchemy/task.h>
#include <alchemy/timer.h>
RT_TASK task;
RT_TASK_INFO info;
void task_body(void *arg)
{
rt_task_inquire(NULL, &info);
}
int main()
{
int err;
err = rt_task_create(&task, "mytask", 0, 1, 0);
if (err != 0){
fprintf(stderr, "failed to create task\n");
exit(EXIT_FAILURE);
}
err = rt_task_start(&task, &task_body, NULL);
if (err != 0){
fprintf(stderr, "failed to start task\n");
exit(EXIT_FAILURE);
}
sleep(5); //sleep for 5 seconds
printf("mode switch = %d\n", (int)(info.stat.msw));
exit(EXIT_SUCCESS);
}
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: Mode Switch
2021-01-03 20:29 Leandro Bucci
@ 2021-01-03 22:00 ` steve freyder
2021-01-03 22:08 ` Leandro Bucci
0 siblings, 1 reply; 12+ messages in thread
From: steve freyder @ 2021-01-03 22:00 UTC (permalink / raw)
To: Leandro Bucci, xenomai
Each time I would do something like this:
printf(...) ;
fflush(stdout) ;
rt_task_sleep(1e9/5) ;
rt_task_inquire(...) ;
msw incremented by 1, csw would increment by 2.
On 1/3/2021 2:29 PM, Leandro Bucci via Xenomai wrote:
> Hi, I have a strange behavior regarding the "mode switch".
> In the attached code, the task should never switch to the Linux domain, but
> instead I have a value of MSW = 2.
> How is it possible?
> Even if I do a printf in the task I always get MSW = 2.
> I can't understand where the problem is.
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <alchemy/task.h>
> #include <alchemy/timer.h>
>
> RT_TASK task;
> RT_TASK_INFO info;
>
> void task_body(void *arg)
> {
> rt_task_inquire(NULL, &info);
> }
>
> int main()
> {
> int err;
>
> err = rt_task_create(&task, "mytask", 0, 1, 0);
> if (err != 0){
> fprintf(stderr, "failed to create task\n");
> exit(EXIT_FAILURE);
> }
>
> err = rt_task_start(&task, &task_body, NULL);
> if (err != 0){
> fprintf(stderr, "failed to start task\n");
> exit(EXIT_FAILURE);
> }
>
> sleep(5); //sleep for 5 seconds
>
> printf("mode switch = %d\n", (int)(info.stat.msw));
>
> exit(EXIT_SUCCESS);
> }
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: Mode Switch
2021-01-03 22:00 ` steve freyder
@ 2021-01-03 22:08 ` Leandro Bucci
2021-01-03 22:16 ` steve freyder
0 siblings, 1 reply; 12+ messages in thread
From: Leandro Bucci @ 2021-01-03 22:08 UTC (permalink / raw)
To: steve freyder, xenomai
But in the task I don't do any printf, how is it possible that MSW = 2?
Il dom 3 gen 2021, 23:00 steve freyder <steve@freyder.net> ha scritto:
> Each time I would do something like this:
>
>
> printf(...) ;
>
> fflush(stdout) ;
>
> rt_task_sleep(1e9/5) ;
>
> rt_task_inquire(...) ;
>
>
> msw incremented by 1, csw would increment by 2.
>
>
> On 1/3/2021 2:29 PM, Leandro Bucci via Xenomai wrote:
>
> Hi, I have a strange behavior regarding the "mode switch".
> In the attached code, the task should never switch to the Linux domain, but
> instead I have a value of MSW = 2.
> How is it possible?
> Even if I do a printf in the task I always get MSW = 2.
> I can't understand where the problem is.
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <alchemy/task.h>
> #include <alchemy/timer.h>
>
> RT_TASK task;
> RT_TASK_INFO info;
>
> void task_body(void *arg)
> {
> rt_task_inquire(NULL, &info);
> }
>
> int main()
> {
> int err;
>
> err = rt_task_create(&task, "mytask", 0, 1, 0);
> if (err != 0){
> fprintf(stderr, "failed to create task\n");
> exit(EXIT_FAILURE);
> }
>
> err = rt_task_start(&task, &task_body, NULL);
> if (err != 0){
> fprintf(stderr, "failed to start task\n");
> exit(EXIT_FAILURE);
> }
>
> sleep(5); //sleep for 5 seconds
>
> printf("mode switch = %d\n", (int)(info.stat.msw));
>
> exit(EXIT_SUCCESS);
> }
>
>
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: Mode Switch
2021-01-03 22:08 ` Leandro Bucci
@ 2021-01-03 22:16 ` steve freyder
2021-01-03 22:22 ` Leandro Bucci
0 siblings, 1 reply; 12+ messages in thread
From: steve freyder @ 2021-01-03 22:16 UTC (permalink / raw)
To: Leandro Bucci, xenomai
Might need some help from Philippe on this one but my thinking says that
thread creation happens in secondary mode, so there's gotta be at least
*one* mode switch on the way to becoming a cobalt thread running in
primary mode, perhaps the second one has to do with launching the
background printf() helper thread?
On 1/3/2021 4:08 PM, Leandro Bucci wrote:
> But in the task I don't do any printf, how is it possible that MSW = 2?
>
> Il dom 3 gen 2021, 23:00 steve freyder <steve@freyder.net
> <mailto:steve@freyder.net>> ha scritto:
>
> Each time I would do something like this:
>
>
> printf(...) ;
>
> fflush(stdout) ;
>
> rt_task_sleep(1e9/5) ;
>
> rt_task_inquire(...) ;
>
>
> msw incremented by 1, csw would increment by 2.
>
>
> On 1/3/2021 2:29 PM, Leandro Bucci via Xenomai wrote:
>> Hi, I have a strange behavior regarding the "mode switch".
>> In the attached code, the task should never switch to the Linux domain, but
>> instead I have a value of MSW = 2.
>> How is it possible?
>> Even if I do a printf in the task I always get MSW = 2.
>> I can't understand where the problem is.
>>
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <unistd.h>
>> #include <alchemy/task.h>
>> #include <alchemy/timer.h>
>>
>> RT_TASK task;
>> RT_TASK_INFO info;
>>
>> void task_body(void *arg)
>> {
>> rt_task_inquire(NULL, &info);
>> }
>>
>> int main()
>> {
>> int err;
>>
>> err = rt_task_create(&task, "mytask", 0, 1, 0);
>> if (err != 0){
>> fprintf(stderr, "failed to create task\n");
>> exit(EXIT_FAILURE);
>> }
>>
>> err = rt_task_start(&task, &task_body, NULL);
>> if (err != 0){
>> fprintf(stderr, "failed to start task\n");
>> exit(EXIT_FAILURE);
>> }
>>
>> sleep(5); //sleep for 5 seconds
>>
>> printf("mode switch = %d\n", (int)(info.stat.msw));
>>
>> exit(EXIT_SUCCESS);
>> }
>
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: Mode Switch
2021-01-03 22:16 ` steve freyder
@ 2021-01-03 22:22 ` Leandro Bucci
2021-01-03 22:57 ` steve freyder
0 siblings, 1 reply; 12+ messages in thread
From: Leandro Bucci @ 2021-01-03 22:22 UTC (permalink / raw)
To: steve freyder, xenomai
I understand, but it's strange because if I do a printf inside the task I
always have MSW = 2. Yes maybe Philippe can help. Thank you too
Il dom 3 gen 2021, 23:16 steve freyder <steve@freyder.net> ha scritto:
> Might need some help from Philippe on this one but my thinking says that
> thread creation happens in secondary mode, so there's gotta be at least
> *one* mode switch on the way to becoming a cobalt thread running in primary
> mode, perhaps the second one has to do with launching the background
> printf() helper thread?
>
>
>
> On 1/3/2021 4:08 PM, Leandro Bucci wrote:
>
> But in the task I don't do any printf, how is it possible that MSW = 2?
>
> Il dom 3 gen 2021, 23:00 steve freyder <steve@freyder.net> ha scritto:
>
>> Each time I would do something like this:
>>
>>
>> printf(...) ;
>>
>> fflush(stdout) ;
>>
>> rt_task_sleep(1e9/5) ;
>>
>> rt_task_inquire(...) ;
>>
>>
>> msw incremented by 1, csw would increment by 2.
>>
>>
>> On 1/3/2021 2:29 PM, Leandro Bucci via Xenomai wrote:
>>
>> Hi, I have a strange behavior regarding the "mode switch".
>> In the attached code, the task should never switch to the Linux domain, but
>> instead I have a value of MSW = 2.
>> How is it possible?
>> Even if I do a printf in the task I always get MSW = 2.
>> I can't understand where the problem is.
>>
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <unistd.h>
>> #include <alchemy/task.h>
>> #include <alchemy/timer.h>
>>
>> RT_TASK task;
>> RT_TASK_INFO info;
>>
>> void task_body(void *arg)
>> {
>> rt_task_inquire(NULL, &info);
>> }
>>
>> int main()
>> {
>> int err;
>>
>> err = rt_task_create(&task, "mytask", 0, 1, 0);
>> if (err != 0){
>> fprintf(stderr, "failed to create task\n");
>> exit(EXIT_FAILURE);
>> }
>>
>> err = rt_task_start(&task, &task_body, NULL);
>> if (err != 0){
>> fprintf(stderr, "failed to start task\n");
>> exit(EXIT_FAILURE);
>> }
>>
>> sleep(5); //sleep for 5 seconds
>>
>> printf("mode switch = %d\n", (int)(info.stat.msw));
>>
>> exit(EXIT_SUCCESS);
>> }
>>
>>
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: Mode Switch
2021-01-03 22:22 ` Leandro Bucci
@ 2021-01-03 22:57 ` steve freyder
0 siblings, 0 replies; 12+ messages in thread
From: steve freyder @ 2021-01-03 22:57 UTC (permalink / raw)
To: Leandro Bucci, xenomai
OK, so then my theory about it having to do with launching a printf
helper must be wrong (maybe that only happens on the original thread).
I don't recall whether you had a flush call after your printf though...
On 1/3/2021 4:22 PM, Leandro Bucci wrote:
> I understand, but it's strange because if I do a printf inside the
> task I always have MSW = 2. Yes maybe Philippe can help. Thank you too
>
> Il dom 3 gen 2021, 23:16 steve freyder <steve@freyder.net
> <mailto:steve@freyder.net>> ha scritto:
>
> Might need some help from Philippe on this one but my thinking
> says that thread creation happens in secondary mode, so there's
> gotta be at least *one* mode switch on the way to becoming a
> cobalt thread running in primary mode, perhaps the second one has
> to do with launching the background printf() helper thread?
>
>
>
> On 1/3/2021 4:08 PM, Leandro Bucci wrote:
>> But in the task I don't do any printf, how is it possible that
>> MSW = 2?
>>
>> Il dom 3 gen 2021, 23:00 steve freyder <steve@freyder.net
>> <mailto:steve@freyder.net>> ha scritto:
>>
>> Each time I would do something like this:
>>
>>
>> printf(...) ;
>>
>> fflush(stdout) ;
>>
>> rt_task_sleep(1e9/5) ;
>>
>> rt_task_inquire(...) ;
>>
>>
>> msw incremented by 1, csw would increment by 2.
>>
>>
>> On 1/3/2021 2:29 PM, Leandro Bucci via Xenomai wrote:
>>> Hi, I have a strange behavior regarding the "mode switch".
>>> In the attached code, the task should never switch to the Linux domain, but
>>> instead I have a value of MSW = 2.
>>> How is it possible?
>>> Even if I do a printf in the task I always get MSW = 2.
>>> I can't understand where the problem is.
>>>
>>> #include <stdio.h>
>>> #include <stdlib.h>
>>> #include <unistd.h>
>>> #include <alchemy/task.h>
>>> #include <alchemy/timer.h>
>>>
>>> RT_TASK task;
>>> RT_TASK_INFO info;
>>>
>>> void task_body(void *arg)
>>> {
>>> rt_task_inquire(NULL, &info);
>>> }
>>>
>>> int main()
>>> {
>>> int err;
>>>
>>> err = rt_task_create(&task, "mytask", 0, 1, 0);
>>> if (err != 0){
>>> fprintf(stderr, "failed to create task\n");
>>> exit(EXIT_FAILURE);
>>> }
>>>
>>> err = rt_task_start(&task, &task_body, NULL);
>>> if (err != 0){
>>> fprintf(stderr, "failed to start task\n");
>>> exit(EXIT_FAILURE);
>>> }
>>>
>>> sleep(5); //sleep for 5 seconds
>>>
>>> printf("mode switch = %d\n", (int)(info.stat.msw));
>>>
>>> exit(EXIT_SUCCESS);
>>> }
>>
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2021-02-15 14:06 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-15 13:00 Mode Switch Leandro Bucci
[not found] ` <358306354.8105980.1613394904650.JavaMail.zimbra@wolfram.com>
2021-02-15 13:16 ` Leandro Bucci
2021-02-15 13:46 ` Per Oberg
2021-02-15 13:52 ` Leandro Bucci
2021-02-15 13:57 ` Julien Blanc
2021-02-15 14:06 ` Leandro Bucci
-- strict thread matches above, loose matches on Subject: below --
2021-01-03 20:29 Leandro Bucci
2021-01-03 22:00 ` steve freyder
2021-01-03 22:08 ` Leandro Bucci
2021-01-03 22:16 ` steve freyder
2021-01-03 22:22 ` Leandro Bucci
2021-01-03 22:57 ` steve freyder
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