[Xenomai-help] pthread_setschedparam() segfault using Xenomai 2.5.2

[Xenomai-help] pthread_setschedparam() segfault using Xenomai 2.5.2

[Stephen Bryant]

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Hi,

I am receiving a segfault when calling pthread_setschedparam().  Both the
thread and the scheduling parameters are initialised to appropraite values,
and I am using SCHED_FIFO.  Attached is example code, similar to my
application (rather than minimalist), that reproduces the error when
compiled for Xenomai (with '--skin=posix --ldflags' and '--cflags'), while
running cleanly when compiled for standard linux.

Is this a problem with pthread_setschedparam(), or am I doing something
wrong?  If you need any more information then let me know.

I am running:
Linux kernel 2.6.32.8
Adeos patch adeos-ipipe-2.6.32.7-x86-2.6-01.patch (it patched cleanly onto
2.6.32.8)
Xenomai 2.5.2
Processor: Core 2 Duo (kernel is compiled to use only 1 core)

Steve

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[-- Attachment #2: SchedParam.cpp --]
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#ifdef __XENO__
#include <posix/posix.h>
#include <sys/mman.h>
#else
#include <pthread.h>
#endif // __XENO__

#include <stdio.h>
#include <unistd.h>

typedef void* (*ENTRYPOINT)(void*);

struct ThreadArgs
{
   public:
      ENTRYPOINT pFcn;
      void* pFcnArgs;
      int Priority;
};

void *ThreadWrapper(void *pArgs);
void TestFcn();

int main()
{
   #ifdef __XENO__
   mlockall(MCL_CURRENT | MCL_FUTURE);
   #endif //__XENO__

   pthread_t* pThread = new pthread_t();;
   struct ThreadArgs *pTArgs = new struct ThreadArgs;
	pthread_attr_t ThreadCustomAttr;

	pthread_attr_init(&ThreadCustomAttr);
	#ifdef __XENO__
   pthread_attr_setstacksize(&ThreadCustomAttr, PTHREAD_STACK_MIN + 10000);
   #else
   pthread_attr_setstacksize(&ThreadCustomAttr, 20000);
   #endif // __XENO__
   pthread_attr_setdetachstate(&ThreadCustomAttr, PTHREAD_CREATE_DETACHED);
   pthread_attr_setinheritsched(&ThreadCustomAttr, PTHREAD_EXPLICIT_SCHED);
   pthread_attr_setscope(&ThreadCustomAttr, PTHREAD_SCOPE_PROCESS);

   pTArgs->pFcn = (ENTRYPOINT) TestFcn;
   pTArgs->pFcnArgs = NULL;
   pTArgs->Priority = 60;

   pthread_create(pThread, &ThreadCustomAttr, ThreadWrapper, (void *) pTArgs);

   if(pThread != NULL) { delete pThread; }

   sleep(3);

   return 0;
}

void *ThreadWrapper(void *pArgs)
{
   void *pResult;
   struct ThreadArgs *pTArgs = (struct ThreadArgs *) pArgs;

	struct sched_param SchedParam;
	SchedParam.sched_priority = pTArgs->Priority;
	pthread_setschedparam(pthread_self(), SCHED_FIFO, &SchedParam);

   pResult = (void *) pTArgs->pFcn(pTArgs->pFcnArgs);

   delete pTArgs;

   return pResult;
}

void TestFcn()
{
   printf("Made it\n");
}

Re: [Xenomai-help] pthread_setschedparam() segfault using Xenomai 2.5.2

[Gilles Chanteperdrix]

Stephen Bryant wrote:
> (...)
> Xenomai 2.5.2

Could you try Xenomai 2.5.3 ?

-- 
					    Gilles.

Re: [Xenomai-help] pthread_setschedparam() segfault using Xenomai 2.5.2

[Stephen Bryant]

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Already compiling the kernel, but it may have to wait until tomorrow,

Steve

On 26 May 2010 16:33, Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org
> wrote:

> Stephen Bryant wrote:
> > (...)
> > Xenomai 2.5.2
>
> Could you try Xenomai 2.5.3 ?
>
> --
>                                             Gilles.
>

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Re: [Xenomai-help] pthread_setschedparam() segfault using Xenomai 2.5.2

[Stephen Bryant]

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On 26 May 2010 16:36, Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org
> wrote:

> Stephen Bryant wrote:
> > Already compiling the kernel, but the results may have to wait until
> > tomorrow,
>
> If it is the bug I am thinking it is, then you do not need to recompile
> the kernel, recompiling user-space support should be enough.
>
>
> --
>                                             Gilles.
>

Using Xenomai 2.5.3 has resolved the problem - and you were right that I did
not need to recompile the kernel, just the user-space support.  I'm guessing
this is the 'posix wrappers: avoid undefined reference with uclibc'
mentioned in the announcement?

Steve

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Re: [Xenomai-help] pthread_setschedparam() segfault using Xenomai 2.5.2

[Gilles Chanteperdrix]

Stephen Bryant wrote:
> On 26 May 2010 16:36, Gilles Chanteperdrix
> <gilles.chanteperdrix@xenomai.org
> <mailto:gilles.chanteperdrix@xenomai.org>> wrote:
> 
>     Stephen Bryant wrote:
>     > Already compiling the kernel, but the results may have to wait until
>     > tomorrow,
> 
>     If it is the bug I am thinking it is, then you do not need to recompile
>     the kernel, recompiling user-space support should be enough.
> 
> 
>     --
>                                                Gilles.
> 
> 
> Using Xenomai 2.5.3 has resolved the problem - and you were right that I
> did not need to recompile the kernel, just the user-space support.  I'm
> guessing this is the 'posix wrappers: avoid undefined reference with
> uclibc' mentioned in the announcement?

It should be:
http://git.xenomai.org/?p=xenomai-2.5.git;a=blobdiff;f=src/skins/common/bind.c;h=d511072c9a0d5b9ccac30b030e0e0266114174a4;hp=352c4e80de5b66442f86820a183d599234951b4e;hb=428aa42410efe575f7bb9729447e6dc49159ef5e;hpb=4dc4361cef9025d125a7a28e5ca02d82c6854345

-- 
					    Gilles.