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userland atomics

     Do we have any kind of atomic operations in userland?  I'm working
with Asterisk on NetBSD 5.99.3.  Its configure script trys to
link this program (along with a lot of #define):

main ()
int foo1; int foo2 = __sync_fetch_and_add(&foo1, 1);
  return 0;

For some reason, the corfigure script believes that it is successful;
however, linking of Asterisk fails later due to a missing symbol.

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