check_memory_limits can be useless

[Nozomu Ando]

check_memory_limits() does not do the job,
 if !HAVE_GETRLIMIT && !WINDOWSNT
 and if there is difference between the GNU Emacs builder's datasize
limit and user's one.


Symptom on my NetBSD/i386:
% cd /path/to/emacs.cvs
% limit data 16m                # set datasize limit 16 mega bytes
% rm src/emacs ; make
% unlimit data                  # set datasize limit 3072 mega bytes
% ./src/emacs
        :
  (do some ten megabyte consuming job on the emacs)

then I got a warning:

Emergency (alloc): Warning: past 85% of memory limit

while I have some hundred mega bytes free memory.


An analysis:
On some platform, check_memory_limits() calls get_lim_data() only once
(vm-limit.c:81) before unexec, so lim_data of vm-limit.c is initialized
by GNU Emacs builder's datasize limit value, not Emacs user's one.


Fix here:
"Force data limit to be recalculated on each run." on other than
WINDOWSNT (patch attached).

---
Nozomu Ando


---
*** vm-limit.c  11 Mar 2006 01:39:14 +0900      1.17
--- vm-limit.c  11 Mar 2006 01:59:51 +0900      
***************
*** 160,169 ****
    warn_function = warnfun;
    __after_morecore_hook = check_memory_limits;
  
- #ifdef WINDOWSNT
    /* Force data limit to be recalculated on each run.  */
    lim_data = 0;
- #endif
  }
  
  /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5
--- 160,167 ----