# ThreadError in SizedQueue#push

**URL:** <https://www.ruby-forum.com/t/threaderror-in-sizedqueue-push/62301>\
**Category:** Development\
**Created:** [June 2, 2006, 2:10pm UTC](https://www.ruby-forum.com/t/threaderror-in-sizedqueue-push/62301 "2006-06-02T14:10:25Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Nobuhiro\_IMAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9f8e36/32.png) [@Nobuhiro\_IMAI](https://www.ruby-forum.com/u/Nobuhiro_IMAI)\
**Post date:** [June 2, 2006, 2:10pm UTC](https://www.ruby-forum.com/t/threaderror-in-sizedqueue-push/62301/1 "2006-06-02T14:10:25Z")

</div>

e$B$$$^$$$G$9!#e(B

SizedQueue e$B$K;XDj$7$?e(B max e$B0J\>e$N%\*%V%8%’%/%H$re(B push  
e$B$7$h$&$H$9$k$He(B  
ThreadError  
e$B$K$J$C$F$7$^$$$^$9!#K\Mh$O$=$3$G%V%m%C%/$5$l$k$s$8$c$J$$$+e(B  
e$B$H;W$&$N$G$9$,!"$I$s$J$b$s$G$7$g$&$+!)e(B

$ ruby -rthread -ve’  
q = SizedQueue.new(1)  
2.times{q.push(nil)}  
’  
ruby 1.8.4 (2005-12-24) [i486-linux]  
/usr/lib/ruby/1.8/thread.rb:426:in `stop': stopping only thread (ThreadError) note: use sleep to stop forever from /usr/lib/ruby/1.8/thread.rb:426:in`push’  
from -e:3  
from -e:3

Thread.stop e$B$re(B sleep  
e$B$K=q$-D\>$9$H%V%m%C%/$7$F$/$l$k$h$&$K$J$j$^$9!#B\>e(B  
e$B$K$b2?%v=j$+e(B Thread.stop e$B$7$F$k$H$3$m$,$"$k$h$&$G$9!#e(B

---

<div class="post-metadata">

**Author:** ![Nobuhiro\_IMAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9f8e36/32.png) [@Nobuhiro\_IMAI](https://www.ruby-forum.com/u/Nobuhiro_IMAI)\
**Post date:** [June 2, 2006, 2:44pm UTC](https://www.ruby-forum.com/t/threaderror-in-sizedqueue-push/62301/2 "2006-06-02T14:44:34Z")

</div>

e$B$J$+$@$G$9!#e(B

At Fri, 2 Jun 2006 21:05:27 +0900,  
Nobuhiro IMAI wrote in [ruby-dev:28678]:

> SizedQueue e$B$K;XDj$7$?e(B max e$B0J\>e$N%\*%V%8%’%/%H$re(B push e$B$7$h$&$H$9$k$He(B  
> ThreadError e$B$K$J$C$F$7$^$$$^$9!#K\Mh$O$=$3$G%V%m%C%/$5$l$k$s$8$c$J$$$+e(B  
> e$B$H;W$&$N$G$9$,!"$I$s$J$b$s$G$7$g$&$+!)e(B
> 
> $ ruby -rthread -ve’  
> q = SizedQueue.new(1)  
> 2.times{q.push(nil)}  
> ’

e$BFI$\_=P$9%9%l%C%I$,$$$J$$$N$K%V%m%C%/$9$k$H$$$&$3$H$O!"%G%C%I%m%Ce(B  
e$B%/$H$$$&$3$H$@$H;W$$$^$9$,!#e(B

---

<div class="post-metadata">

**Author:** ![Nobuhiro\_IMAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9f8e36/32.png) [@Nobuhiro\_IMAI](https://www.ruby-forum.com/u/Nobuhiro_IMAI)\
**Post date:** [June 2, 2006, 4:21pm UTC](https://www.ruby-forum.com/t/threaderror-in-sizedqueue-push/62301/3 "2006-06-02T16:21:50Z")

</div>

e$B31$H$$$$$^$9!#e(B

On 2006/06/02, at 21:43, removed\_email\_address@domain.invalid wrote:

> > 2.times{q.push(nil)}  
> > ’
> 
> e$BFI$\_=P$9%9%l%C%I$,$$$J$$$N$K%V%m%C%/$9$k$H$$$&$3$H$O!"%G%C%I%m%Ce(B  
> e$B%/$H$$$&$3$H$@$H;W$$$^$9$,!#e(B

e$B$3$s$JIw$K;n$7$F$\_$^$7$?!#e(B

cinq:~ mas$ irb --prompt simple -r thread

> > $q = SizedQueue.new(1)  
> > =\> #\<SizedQueue:0x322be8 @waiting=[], @queue\_wait=[], @max=1, @que=[]\>
> 
> > th = Thread.new { 2.times { $q.push(nil) }; ‘done’ }  
> > =\> #\<Thread:0x31b960 sleep\>
> 
> > th  
> > =\> #\<Thread:0x31b960 sleep\>
> 
> > $q.pop  
> > =\> nil
> 
> > th  
> > =\> #\<Thread:0x31b960 dead\>
> 
> > th.value  
> > =\> “done”

---

<div class="post-metadata">

**Author:** ![Nobuhiro\_IMAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/9f8e36/32.png) [@Nobuhiro\_IMAI](https://www.ruby-forum.com/u/Nobuhiro_IMAI)\
**Post date:** [June 5, 2006, 11:55am UTC](https://www.ruby-forum.com/t/threaderror-in-sizedqueue-push/62301/4 "2006-06-05T11:55:19Z")

</div>

e$B$$$^$$$G$9!#e(B

From: nobu\_at\_ruby-lang.org  
Date: Fri, 2 Jun 2006 21:43:17 +0900

> > 2.times{q.push(nil)}  
> > ’
> 
> e$BFI$\_=P$9%9%l%C%I$,$$$J$$$N$K%V%m%C%/$9$k$H$$$&$3$H$O!"%G%C%I%m%Ce(B  
> e$B%/$H$$$&$3$H$@$H;W$$$^$9$,!#e(B

e$B3N$+$K%G%C%I%m%C%/$G$9$M!#FC$KL54X78$J%9%l%C%I$G$b!"B8:\_$9$l$P%V%m%C%/e(B  
e$B$O$9$k$s$G$9$M!#e(B

$ ruby -v -rthread -e’  
Thread.start{sleep 5; puts “deadlock from now on”}  
q = SizedQueue.new(1)  
2.times{|i| q.push(i); p i}  
’  
ruby 1.8.4 (2005-12-24) [i486-linux]  
0  
deadlock from now on  
(e$B0J9\_%G%C%I%m%C%/e(B)

1 e$B9TL$Ge(B join  
e$B$9$l$P85$N$HF1$8%(%i!\<$K$J$j$^$7$?$,!"$9$G$K2?$,$7$?$$$+e(B  
e$BJ,$+$i$J$/$J$C$F$-$?$N$G!"$3$NJU$G\<:Ni$7$^$9!#$\*A{$,$;$7$^$7$?!#e(B