[lwip-users] Re: [lwip] Problem with timeouts

[Martin Glunz]

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David Haas wrote:
> =

=2E.. =

> Now can solve this by creating a special thread just to do the
> initialization which will then always wait for a semaphore it will
> never get, but I think this points out some deeper weakness with
> lwip's interaction with an rtos. =


At the moment, I've done this exactly this way. But my simple
cooperative OS has a timer facility, I'd like to use this for
the timeouts.

> =

> On a similar note, I think there should be an option for users to have
> their own malloc as part of a port and use of mem_malloc should be
> optional. (where perhaps an conditional compile calls a sys_malloc
> function instead of mem_malloc).
This is easily done by replacing the mem.c module with your own. Just
include such a module in your source, and link it before the lwip
library gets linked. Declare MEM_SIZE in lwipopts.h to zero. =

I've attached my mem.c source for example.
Note that I increase the size of the allocated memory a bit, otherwise
I get CPU address errors from the SH. There seems to be a problem with
the memory sizes, but I haven't found this yet.


-- =


Martin Glunz


fortune says today:
Q:  Why do ducks have flat feet?
A:  To stamp out forest fires.

Q:  Why do elephants have flat feet?
A:  To stamp out flaming ducks.

WANTED: Schr=F6dinger's Cat. Dead or Alive.

There are only 10 kinds of people. Those who
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/*-----------------------------------------------------------------------------------*/
/* mem.c
 *
 * Memory manager.
 *
 */
/*-----------------------------------------------------------------------------------*/
#include <stdlib.h>

#include "lwip/debug.h"

#include "lwip/arch.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"

#include "lwip/sys.h"

#include "lwip/stats.h"

void
mem_init(void)
{ }

/*-----------------------------------------------------------------------------------*/
void *
mem_malloc(mem_size_t size)
{
  void *xx;
  int new_sz=size+32-(size & 0x0f);
  xx=malloc(new_sz);
  DEBUGF(MEM_DEBUG,("malloc %d %08X\n",new_sz,(int)xx));
  return xx;
}
/*-----------------------------------------------------------------------------------*/
void
mem_free(void *rmem)
{
  DEBUGF(MEM_DEBUG,("free %08X\n",(int)rmem));
  free(rmem);
}
/*-----------------------------------------------------------------------------------*/
void *
mem_reallocm(void *rmem, mem_size_t newsize)
{
  void *xx;
  int new_sz=newsize+32-(newsize & 0x0f);
  xx=realloc(rmem, new_sz);
  DEBUGF(MEM_DEBUG,("reallocm %d %08X\n",new_sz,(int)xx));
  return xx;
}
/*-----------------------------------------------------------------------------------*/
void *
mem_realloc(void *rmem, mem_size_t newsize)
{
  void *xx;
  int new_sz=newsize+32-(newsize & 0x0f);
  xx=realloc(rmem, new_sz);
  DEBUGF(MEM_DEBUG,("realloc %d %08X\n",new_sz,(int)xx));
  return xx;
}
/*-----------------------------------------------------------------------------------*/

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