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atexit() stuff in thread-local reent?


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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