Experimental Physics and
Industrial Control System

Kate Feng <[email protected]> · Mon, 11 Jun 2007 10:04:03 -0400

EPICS  OSI Release : 3.14.x   ( at least 3.14.6 and up )
File : src/libCom/osi/os/RTEMS/osdPoolStatus.c

Problem :
"return (malloc_free_space() > 50000 + contiguousBlockSize);"
will falsely return true when RTEMS function call
malloc_free_space() returns -1, which actually indicates
an internal RTEMS error such as corrupted heap,or illegal
region id etc.  Since neither EPICS nor RTEMS prints out
the error condition, this kind of error could be hard to be
debugged.

FIX : src/libCom/osi/os/RTEMS/osdPoolStatus.c
return ( ((int) malloc_free_space()) > 50000 + contiguousBlockSize);

Or I actually preferred  something like :

/*
 * osiSufficentSpaceInPool ()
 */
epicsShareFunc int epicsShareAPI osiSufficentSpaceInPool ( size_t
contiguousBlockSize )
{
  int free;

  if ( (free=malloc_free_space())==-1)
     return(0);
  if ( free < 100000 + contiguousBlockSize) {
    printf("Largest free space available : 0x%x,  requested
contiguousBlockSize : 0x%x\n",
    free, contiguousBlockSize);
    return(0);
  }
  return(1);
}

Besides, RTEMS should print out what the internal error message is.

Regards,
Kate

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System