ext/raindrops/raindrops_atomic.h

   1 /*
   2  * use wrappers around libatomic-ops for folks that don't have GCC
   3  * or a new enough version of GCC
   4  */
   5 #ifndef HAVE_GCC_ATOMIC_BUILTINS
   6 #include <atomic_ops.h>
   7
   8 static inline unsigned long
   9 __sync_add_and_fetch(unsigned long *dst, unsigned long incr)
  10 {
  11         AO_t tmp = AO_fetch_and_add((AO_t *)dst, (AO_t)incr);
  12
  13         return (unsigned long)tmp + incr;
  14 }
  15
  16 static inline unsigned long
  17 __sync_sub_and_fetch(unsigned long *dst, unsigned long incr)
  18 {
  19         AO_t tmp = AO_fetch_and_add((AO_t *)dst, (AO_t)(-(long)incr));
  20
  21         return (unsigned long)tmp - incr;
  22 }
  23 #endif /* HAVE_GCC_ATOMIC_BUILTINS */