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Expose whether two arrays are shared

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* array.c (rb_ary_shared_with_p): new function.
  Expose whether two arrays are shared (read-only, C only).

* include/ruby/intern.h (rb_ary_shared_with_p): declare.
  Patch by Greg Price.
  [ruby-core:47970] [Bug #7158]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37478 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shirosaki 2012-11-05 15:24:07 +00:00
parent 4d414c9f68
commit e575070f2f
4 changed files with 27 additions and 1 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
Mon Nov 5 23:23:51 2012 Greg Price <price@mit.edu>
* array.c (rb_ary_shared_with_p): new function.
Expose whether two arrays are shared (read-only, C only).
* include/ruby/intern.h (rb_ary_shared_with_p): declare.
Patch by Greg Price.
[ruby-core:47970] [Bug #7158]
Mon Nov 5 23:21:14 2012 Greg Price <price@mit.edu>
* load.c (loaded_feature_path): clarify and briefly comment

16
array.c
View file

@ -305,6 +305,22 @@ rb_ary_frozen_p(VALUE ary)
return Qfalse;
}
/* This can be used to take a snapshot of an array (with
e.g. rb_ary_replace) and check later whether the array has been
modified from the snapshot. The snapshot is cheap, though if
something does modify the array it will pay the cost of copying
it. */
VALUE
rb_ary_shared_with_p(VALUE ary1, VALUE ary2)
{
if (!ARY_EMBED_P(ary1) && ARY_SHARED_P(ary1)
&& !ARY_EMBED_P(ary2) && ARY_SHARED_P(ary2)
&& RARRAY(ary1)->as.heap.aux.shared == RARRAY(ary2)->as.heap.aux.shared) {
return Qtrue;
}
return Qfalse;
}
static VALUE
ary_alloc(VALUE klass)
{

1
include/ruby/intern.h
View file

@ -56,6 +56,7 @@ VALUE rb_ary_tmp_new(long);
void rb_ary_free(VALUE);
void rb_ary_modify(VALUE);
VALUE rb_ary_freeze(VALUE);
VALUE rb_ary_shared_with_p(VALUE, VALUE);
VALUE rb_ary_aref(int, VALUE*, VALUE);
VALUE rb_ary_subseq(VALUE, long, long);
void rb_ary_store(VALUE, long, VALUE);

2
load.c
View file

@ -88,7 +88,7 @@ loaded_feature_path(const char *name, long vlen, const char *feature, long len,
long plen;
const char *e;
if (vlen < len+1) return 0
if (vlen < len+1) return 0;
if (!strncmp(name+(vlen-len), feature, len)) {
plen = vlen - len - 1;
}