[Xenomai-help] rt_task_spawn how to

[Xenomai-help] rt_task_spawn how to

[Patrice Congo]

Hi all,

is it possible to spawn a task from another rt task? 
The following code tries but the spawner task get
blocked:
<code>
#include <string.h>
#include <stdio.h>

#include <native/task.h>
//#include <general_macros.h>

#define STACK_SIZE 8192

RT_TASK spawner;
RT_TASK spawnee;
void spawner_work(void* c);
void spawnee_work(void* c);

void spawner_work(void* c)
{
	printf("\nspawner\n");
	//SWITCH_TASK_TO_SECONDARY_MODE();
	int
ret=rt_task_spawn(&spawnee,"spawnee",STACK_SIZE,50,0,spawnee_work,NULL);
	printf("IN SPAWNER WORK: ret=%d
%s\n",ret,strerror(ret));
}

void spawnee_work(void* c)
{
	printf("I am spawnee");	
}

int main(int argc, char *argv[])
{
	int ret=
	
rt_task_spawn(&spawner,"spawner",STACK_SIZE,50,0,spawner_work,NULL);
	printf("\nIN MAIN:ret=%d %s\n",ret,strerror(-ret));
	getchar();
	return 0;
}

</code>

The resulting output is:
<output>
spawner

IN MAIN:ret=0 Success

</output>
Thie means the resulting the task "spawner" starts but
is blocked at rt_task_spawn. 
switching context explicitely to primary or secondary
does not help too.
 
do you see some mistakes? can you help?

thanks in advance, patrice


	

	
		
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[Xenomai-help] rt_task_spawn how to

[Patrice Congo]

Hi all,

is it posible to spawn a  task from another rt task?
The following code tries to, but does not succeed:
<code>
#include <string.h>
#include <stdio.h>

#include <native/task.h>
//#include <general_macros.h>

#define STACK_SIZE 8192

RT_TASK spawner;
RT_TASK spawnee;
void spawner_work(void* c);
void spawnee_work(void* c);

void spawner_work(void* c)
{
	printf("\nspawner\n");
	//SWITCH_TASK_TO_SECONDARY_MODE();
	int
ret=rt_task_spawn(&spawnee,"spawnee",STACK_SIZE,50,0,spawnee_work,NULL);
	printf("IN SPAWNER WORK: ret=%d
%s\n",ret,strerror(ret));
}

void spawnee_work(void* c)
{
	printf("I am spawnee");	
}

int main(int argc, char *argv[])
{
	int ret=
	
rt_task_spawn(&spawner,"spawner",STACK_SIZE,50,0,spawner_work,NULL);
	printf("\nIN MAIN:ret=%d %s\n",ret,strerror(-ret));
	getchar();
	return 0;
}


</code>

the resulting output is:
<output>
spawner

IN MAIN:ret=0 Success

</output>
This means that the task "spawner" starts but get
blocked at rt_task_spwan call.

Switching context explicitely to secondary or to
primary does not help too.

can you help?

best, patrice


	

	
		
___________________________________________________________ 
Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de

Re: [Xenomai-help] rt_task_spawn how to

[Jan Kiszka]

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Hi Patrice,

Patrice Congo wrote:
> Hi all,
> 
> is it posible to spawn a  task from another rt task?
> The following code tries to, but does not succeed:
> <code>
> #include <string.h>
> #include <stdio.h>
> 
> #include <native/task.h>
> //#include <general_macros.h>
> 
> #define STACK_SIZE 8192
> 
> RT_TASK spawner;
> RT_TASK spawnee;
> void spawner_work(void* c);
> void spawnee_work(void* c);
> 
> void spawner_work(void* c)
> {
> 	printf("\nspawner\n");
> 	//SWITCH_TASK_TO_SECONDARY_MODE();
> 	int
> ret=rt_task_spawn(&spawnee,"spawnee",STACK_SIZE,50,0,spawnee_work,NULL);
> 	printf("IN SPAWNER WORK: ret=%d
> %s\n",ret,strerror(ret));
> }
> 
> void spawnee_work(void* c)
> {
> 	printf("I am spawnee");	
> }
> 
> int main(int argc, char *argv[])
> {
> 	int ret=
> 	
> rt_task_spawn(&spawner,"spawner",STACK_SIZE,50,0,spawner_work,NULL);
> 	printf("\nIN MAIN:ret=%d %s\n",ret,strerror(-ret));
> 	getchar();
> 	return 0;
> }
> 
> 
> </code>
> 
> the resulting output is:
> <output>
> spawner
> 
> IN MAIN:ret=0 Success
> 
> </output>
> This means that the task "spawner" starts but get
> blocked at rt_task_spwan call.

Hmm, strange. This is what I see with latest SVN checkout of Xenomai:

spawner
IN SPAWNER WORK: ret=0 Success
I am spawnee
IN MAIN:ret=0 Success

Looks fine.

But you are lacking mlockall() in your demo. Maybe some page fault is
hitting your spawnee during creation.

> 
> Switching context explicitely to secondary or to
> primary does not help too.
> 
> can you help?
> 
> best, patrice
> 

Jan

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