[#58730] [ruby-trunk - misc #9188][Open] r43870 make benchmark/bm_so_k_nucleotide.rb slow — "authorNari (Narihiro Nakamura)" <authorNari@...>

17 messages 2013/12/01

[#58732] [ruby-trunk - Bug #9189][Open] Build failure on Windows in case of nonascii TEMP environment. — "phasis68 (Heesob Park)" <phasis@...>

11 messages 2013/12/01

[#58750] [ruby-trunk - Feature #9190][Open] Expose serial helper macros — "simeonwillbanks (Simeon Willbanks)" <sfw@...>

13 messages 2013/12/01

[#58756] [ruby-trunk - Bug #9192][Open] Inconsistent comparison between Float and BigDecimal — "vatsu (Gustavo Sales)" <vatsu21@...>

18 messages 2013/12/02

[#58797] [ruby-trunk - Bug #9198][Open] Segfault in TestException#test_machine_stackoverflow — "vo.x (Vit Ondruch)" <v.ondruch@...>

11 messages 2013/12/02

[#58833] [ruby-trunk - Bug #9205][Open] Assertion failed: heap_pages_deferred_final == 0 — "phasis68 (Heesob Park)" <phasis@...>

11 messages 2013/12/03

[#58866] [ruby-trunk - misc #9215][Open] Maintenance Policy for Future Releases (2.1.0 & beyond) — "hone (Terence Lee)" <hone02@...>

17 messages 2013/12/05

[#58876] [ruby-trunk - Bug #9221][Open] Time.parse performance becomes exponentially worse as string length grows — "mpelzsherman (Michael Pelz-Sherman)" <mpelzsherman@...>

15 messages 2013/12/05

[#58948] [ruby-trunk - Bug #9226][Open] Getting method `inspect' called on unexpected T_NODE object (0x000000025ddea8 flags=0x109089c klass=0x0) (NotImplementedError) from Hash#inspect — "myronmarston (Myron Marston)" <myron.marston@...>

11 messages 2013/12/07

[#59032] [ruby-trunk - Bug #9239][Open] Array#to_h ignores flat arrays — "sawa (Tsuyoshi Sawada)" <sawadatsuyoshi@...>

15 messages 2013/12/10

[#59122] [ruby-trunk - Bug #9251][Open] ! operator has lower precedence than = in an assignment expression — "rits (First Last)" <redmine@...>

26 messages 2013/12/15

[#59198] [ruby-trunk - Bug #9262][Open] global_method_cache should be configurable or grow automatically — "tmm1 (Aman Gupta)" <[email protected]>

28 messages 2013/12/19

[#59209] [ruby-trunk - Bug #9264][Open] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — "spastorino (Santiago Pastorino)" <santiago@...>

15 messages 2013/12/19
[#59211] [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — "zzak (Zachary Scott)" <e@...> 2013/12/19

[#59212] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Santiago Pastorino <spastorino@...> 2013/12/19

zzak, make distclean is the first thing I've ran. Read the gist again :),

[#59213] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Zachary Scott <e@...> 2013/12/19

Sorry I missed the gist, can you try building outside of $srcdir?

[#59214] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Santiago Pastorino <spastorino@...> 2013/12/19

It works if I do ...

[#59215] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Zachary Scott <e@...> 2013/12/19

I've been using the following:

[#59255] [ruby-trunk - Bug #9276][Open] "RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead" warning should not be issued when both ENV vars are set. — "myronmarston (Myron Marston)" <myron.marston@...>

10 messages 2013/12/21

[#59260] [ruby-trunk - Feature #9278][Open] Magic comment "immutable: string" makes "literal".freeze the default for that file — "colindkelley (Colin Kelley)" <colin@...>

12 messages 2013/12/22

[#59343] [ruby-trunk - Bug #9309][Open] Crash while running tests — "mdemare (Michiel de MAre)" <merloen@...>

12 messages 2013/12/27

[#59345] [ruby-trunk - Bug #9310][Open] inheritance.rb: 27: [BUG] Segmentation fault at 0x00000c — "jasnow (Al Snow)" <jasnow@...>

10 messages 2013/12/27

[#59349] [ruby-trunk - Bug #9312][Open] Build the ruby executable in bin/ — "postmodern (Hal Brodigan)" <postmodern.mod3@...>

13 messages 2013/12/28

[#59365] [ruby-trunk - Bug #9316][Open] BigDecimal division in Ruby 2.1 — "abernardes (Andre Oliveira)" <abernardes@...>

15 messages 2013/12/28

[#59398] [ruby-trunk - Bug #9321][Open] rb_mod_const_missing does not generate a c-return event — "drkaes (Stefan Kaes)" <stkaes@...>

41 messages 2013/12/30

[#59429] [ruby-trunk - Feature #9330][Open] [PATCH 0/3] avoid redundant fcntl/fstat syscalls for cloexec sockets — "normalperson (Eric Wong)" <normalperson@...>

10 messages 2013/12/31

[ruby-core:59102] [ruby-trunk - Feature #6309] Add a reference queue for weak references

From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2013-12-14 04:33:17 UTC
List: ruby-core #59102
Issue #6309 has been updated by nobu (Nobuyoshi Nakada).


My PR: https://github.com/ruby/ruby/pull/480
----------------------------------------
Feature #6309: Add a reference queue for weak references
https://bugs.ruby-lang.org/issues/6309#change-43663

Author: headius (Charles Nutter)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: current: 2.1.0


Most interesting uses of WeakRef are much harder to do efficiently without a reference queue.

A reference queue, as implemented by the JVM, is basically a queue into which weak references are placed some time after the object they refer to has been collected. The queue can be polled cheaply to look for collected references.

A simple example of usage can be seen in the weakling gem, with an efficient implementation of an ID hash: https://github.com/headius/weakling/blob/master/lib/weakling/collections.rb

Notice the _cleanup method is called for every operation, to keep the hash clear of dead references. Failure to have a _cleanup method would mean the hash grows without bounds.

_cleanup cannot be implemented efficiently on MRI at present because there's no reference queue implementation. On MRI, _cleanup would have to perform a linear scan of all stored values periodically to search for dead references. For a heavily used hash with many live values, this becomes a very expensive operation.

It's probably possible to implement reference queues efficiently atop the new ObjectSpace::WeakMap internals, since it already keeps track of weak references and can run code when a weak reference no longer refers to a live object.


-- 
http://bugs.ruby-lang.org/

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