msgrcv: properly downgrade the receive buffer

[perl5.git] / av.h

diff --git a/av.h b/av.h
index dcd32cf..6903db6 100644 (file)
--- a/av.h
+++ b/av.h
@@ -37,20 +37,25 @@ struct xpvav {
  */
 
 /*
-=head1 Handy Values
-
-=for apidoc AmU||Nullav
+=for apidoc ADmnU||Nullav
 Null AV pointer.
 
 (deprecated - use C<(AV *)NULL> instead)
 
-=head1 Array Manipulation Functions
+=for apidoc Am|SSize_t|AvFILL|AV* av
+Same as C<L</av_top_index>> or C<L</av_tindex>>.
+
+=for apidoc Cm|SSize_t|AvFILLp|AV* av
+
+If the array C<av> is empty, this returns -1; otherwise it returns the maximum
+value of the indices of all the array elements which are currently defined in
+C<av>.  It does not handle magic, hence the C<p> private indication in its name.
 
-=for apidoc Am|int|AvFILL|AV* av
-Same as C<av_top_index()>.  Deprecated, use C<av_top_index()> instead.
+=for apidoc Am|SV**|AvARRAY|AV* av
+Returns a pointer to the AV's internal SV* array.
 
-=for apidoc Am|int|av_tindex|AV* av
-Same as C<av_top_index()>.
+This is useful for doing pointer arithmetic on the array.
+If all you need is to look up an array element, then prefer C<av_fetch>.
 
 =cut
 */
@@ -79,7 +84,15 @@ Same as C<av_top_index()>.
                                           
 #define AvFILL(av)     ((SvRMAGICAL((const SV *) (av))) \
                         ? mg_size(MUTABLE_SV(av)) : AvFILLp(av))
-#define av_tindex(av)   av_top_index(av)
+#define av_top_index(av) AvFILL(av)
+#define av_tindex(av)    av_top_index(av)
+
+/* Note that it doesn't make sense to do this:
+ *      SvGETMAGIC(av); IV x = av_tindex_nomg(av);
+ */
+#   define av_top_index_skip_len_mg(av)                                     \
+                            (__ASSERT_(SvTYPE(av) == SVt_PVAV) AvFILLp(av))
+#   define av_tindex_skip_len_mg(av)  av_top_index_skip_len_mg(av)
 
 #define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
 
@@ -96,11 +109,5 @@ Perl equivalent: C<my @array;>.
 #define newAV()        MUTABLE_AV(newSV_type(SVt_PVAV))
 
 /*
- * Local variables:
- * c-indentation-style: bsd
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- *
  * ex: set ts=8 sts=4 sw=4 et:
  */