diff options
Diffstat (limited to 'libglusterfs/src/globals.h')
-rw-r--r-- | libglusterfs/src/globals.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libglusterfs/src/globals.h b/libglusterfs/src/globals.h index e6cb593c238..50734ecc2d8 100644 --- a/libglusterfs/src/globals.h +++ b/libglusterfs/src/globals.h @@ -80,6 +80,23 @@ #define THIS (*__glusterfs_this_location()) #define DECLARE_OLD_THIS xlator_t *old_THIS = THIS +/* + * a more comprehensive feature test is shown at + * http://lists.iptel.org/pipermail/semsdev/2010-October/005075.html + * this is sufficient for RHEL5 i386 builds + */ +#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && !defined(__i386__) +# define INCREMENT_ATOMIC(lk, op) __sync_add_and_fetch(&op, 1) +# define DECREMENT_ATOMIC(lk, op) __sync_sub_and_fetch(&op, 1) +#else +/* These are only here for old gcc, e.g. on RHEL5 i386. + * We're not ever going to use this in an if stmt, + * but let's be pedantically correct for style points */ +# define INCREMENT_ATOMIC(lk, op) do { LOCK (&lk); ++op; UNLOCK (&lk); } while (0) +/* this is a gcc 'statement expression', it works with llvm/clang too */ +# define DECREMENT_ATOMIC(lk, op) ({ LOCK (&lk); --op; UNLOCK (&lk); op; }) +#endif + xlator_t **__glusterfs_this_location (void); xlator_t *glusterfs_this_get (void); int glusterfs_this_set (xlator_t *); |