Trouble with understanding #define macros from some source code. Please help.

Hi All,
   I am trying to dissect some source code, but the C code there
really confuses me. The problem I had is the declaration of the macros
and the way they use them.
   While I would like to find out how  DEF_MARCEL_POSIX is defined, I
found the following in the source:

# define DEF_ALIAS_POSIX_OF_MARCEL(rtype, name, proto, args)

# define DEF_ALIAS_POSIX(rtype, name, proto, args)

#define DEF_ALIAS_MARCEL(rtype, name, proto, args) \
  TBX_FUN_ALIAS(rtype, MARCEL_NAME(name), \
    LOCAL_MARCEL_NAME(name), proto, args);             // why there is
a semi colon at the end?

#define DEF_MARCEL_POSIX(rtype, name, proto, args) \
  DEF_ALIAS_MARCEL(rtype, name, proto, args) \
  DEF_ALIAS_POSIX(rtype, name, proto, args) \
  DEF_ALIAS_POSIX_OF_MARCEL(rtype, name, proto, args) \
  rtype LOCAL_MARCEL_NAME(name) proto

-------------------------------------------------------------------------------------------------------------------------------------------
And in another file from the source, several occurrences of
DEF_MARCEL_POSIX, like this:

DEF_MARCEL_POSIX(int, attr_setstacksize, (marcel_attr_t *attr, size_t
stack), (attr, stack))
{
   if (stack > THREAD_SLOT_SIZE) {
      errno = EINVAL;
      return 1;
   }
   attr->__stacksize = stack;
   return 0;
}
....................
...................
DEF_MARCEL_POSIX(int, attr_getstacksize, (__const marcel_attr_t *
__restrict attr, size_t * __restrict stack), (attr, stack))
{
  *stack = attr->__stacksize;
  return 0;
}
-------------------------------------------------------------------------------------------------------------------------------------------
   I got completely lost here. What is DEF_MARCEL_POSIX defined to be?
Why it is declared as functions multiple times in the other file?

   Thanks in advance..

-tony
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