atexit() stuff in thread-local reent?

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

Hello,

currently the struct _reent contains some atexit() stuff:

struct _reent {
  [...]
  /* atexit stuff */
  struct _atexit *_atexit;
  struct _atexit _atexit0;
  [...]
};

on PowerPC for example this accounts for 400 of 1088 bytes of the 
structure.  From my point of view the atexit() stuff belongs to the 
global state and is not thread-specific.  I think all atexit() related 
functions (in __call_atexit.c and  __atexit.c, are there more?) use 
_GLOBAL_REENT.  This is related to the possibly unused _wrapup_reent() 
function.  Maybe we should introduce two structures.  One for the global 
state (contains thread-specific state + atexit() stuff) and one for the 
thread-specific state.  This might save 400 bytes (37% of current 
_reent) per thread.

--
Sebastian Huber, embedded brains GmbH

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