# \[ruby1.9\] fork $B$H(B thread

**URL:** <https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580>\
**Category:** Development\
**Created:** [May 14, 2008, 11:24am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580 "2008-05-14T11:24:38Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 14, 2008, 11:24am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/1 "2008-05-14T11:24:38Z")

</div>

e$B1J0f!wCNG=!%6e9)Bg$G$9!%e(B

native thread e$B$N4X78$H$O;W$$$^$9$,!$e(B  
Ruby 1.9 e$B$Ge(B fork e$B$7$?e(B thread e$B0J30$Ge(B waitpid  
e$B$G$-$J$$$N$O!$e(B  
e$B;EMM$H$7$FHr$1$h$&$,$J$$$3$H$J$N$G$7$g$&$+!)e(B

* * *

$ ruby19 -v  
ruby 1.9.0 (2008-05-14 revision 0) [i686-linux]

$ irb19  
irb(main):001:0\> pid = fork { exec ‘kterm’ }  
=\> 31383  
irb(main):002:0\> Process.waitpid(pid)

… kterm e$B$r=\*N;e(B …

=\> 31383  
irb(main):003:0\> pid = fork { exec ‘kterm’ }  
=\> 31395  
irb(main):004:0\> Thread.new{ Process.waitpid(pid) }.value  
Errno::ECHILD: No child processes  
from (irb):4:in `waitpid' from (irb):4:in`block (4 levels) in irb\_binding’

… kterm e$B$r=\*N;e(B …

irb(main):005:0\> Thread.new{ Process.waitpid(fork{ exec ‘kterm’ })  
}.value

… kterm e$B$r=\*N;e(B …

## =\> 31409

e$B$b$A$m$se(B Ruby 1.8 e$B$G$OLdBj$J$/e(B waitpid  
e$B$GBT$D$3$H$,$G$-$^$9!%e(B

---

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 15, 2008, 6:46am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/2 "2008-05-15T06:46:19Z")

</div>

e$B5WJ]$G$9!#e(B

2008/5/14 Hidetoshi NAGAI [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> e$B1J0f!wCNG=!%6e9)Bg$G$9!%e(B
> 
> native thread e$B$N4X78$H$O;W$$$^$9$,!$e(B  
> Ruby 1.9 e$B$Ge(B fork e$B$7$?e(B thread e$B0J30$Ge(B waitpid e$B$G$-$J$$$N$O!$e(B  
> e$B;EMM$H$7$FHr$1$h$&$,$J$$$3$H$J$N$G$7$g$&$+!)e(B

Linux 2.4 e$B$Ne(B LinuxThreads e$B$N@)8B$G$7$g$&!#e(B  
e$B;n83$7$F$$$^$;$s$,!"e(BLinux 2.6 e$B$de(B Solaris  
e$B$G$O4|BTDL$j$KF0$/$+$H!#e(B  
e$B;2\>He(B:  
[http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30593](http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30593)  
[http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30610](http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30610)

---

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 15, 2008, 7:04am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/3 "2008-05-15T07:04:28Z")

</div>

e$B1J0f!wCNG=!%6e9)Bg$G$9!%e(B

From: “KUBO Takehiro” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Subject: [ruby-dev:34710] Re: [ruby1.9] fork e$B$He(B thread  
Date: Thu, 15 May 2008 13:45:55 +0900  
Message-ID: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

> > native thread e$B$N4X78$H$O;W$$$^$9$,!$e(B  
> > Ruby 1.9 e$B$Ge(B fork e$B$7$?e(B thread e$B0J30$Ge(B waitpid e$B$G$-$J$$$N$O!$e(B  
> > e$B;EMM$H$7$FHr$1$h$&$,$J$$$3$H$J$N$G$7$g$&$+!)e(B
> 
> Linux 2.4 e$B$Ne(B LinuxThreads e$B$N@)8B$G$7$g$&!#e(B  
> e$B;n83$7$F$$$^$;$s$,!"e(BLinux 2.6 e$B$de(B Solaris e$B$G$O4|BTDL$j$KF0$/$+$H!#e(B

kernel e$B$Oe(B 2.6.15 e$B$G$9!%8E$9$.$^$9$+!)e(B  
e$B$=$l$H$be(B kernel option e$B$N@\_Dj$,2?$+0-$$$H$+$G$7$g$&$+!%e(B

> e$B;2\>He(B:  
> [http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30593](http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30593)  
> [http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30610](http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/30610)

e$B$9$_$^$;$s!%8+$F$^$;$s$G$7$?!%e(B(^_^;

e$B$$$:$l$K$;$h!$e(Bth = Thread.new{Process.waitpid(fork{…})}  
e$B$J$I$He(B  
e$B$7$F$\*$$$Fe(B th.join  
e$B$H$$$&$h$&$K$G$b$9$k$7$+$J$5$=$&$G$9$M!%e(B(;\_😉

---

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 15, 2008, 8:28am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/4 "2008-05-15T08:28:18Z")

</div>

e$B5WJ]$G$9!#e(B

2008/5/15 Hidetoshi NAGAI [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> > Linux 2.4 e$B$Ne(B LinuxThreads e$B$N@)8B$G$7$g$&!#e(B  
> > e$B;n83$7$F$$$^$;$s$,!"e(BLinux 2.6 e$B$de(B Solaris e$B$G$O4|BTDL$j$KF0$/$+$H!#e(B
> 
> kernel e$B$Oe(B 2.6.15 e$B$G$9!%8E$9$.$^$9$+!)e(B  
> e$B$=$l$H$be(B kernel option e$B$N@\_Dj$,2?$+0-$$$H$+$G$7$g$&$+!%e(B

e$B;d$N4D6-e(B Linux kernel 2.6.22, glibc 2.6.1 e$B$G$Oe(B  
pid = fork { exec ‘xterm’ }  
Thread.new{ Process.waitpid(pid) }.value  
e$B$,F0$-$^$7$?!#e(B(kterm e$B$OF~$l$F$J$$$N$Ge(B xterm e$B$GBeMQe(B)

glibc e$B$N%P!\<%8%g%s$,8E$$$+4D6-JQ?te(B LD\_ASSUME\_KERNEL e$B$re(B  
e$B@\_Dj$7$F$$$k$+$N$I$A$i$+$G$O$J$$$+$H!#e(B

---

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 15, 2008, 8:31am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/5 "2008-05-15T08:31:15Z")

</div>

e$B1J0f!wCNG=!%6e9)Bg$G$9!%e(B

From: Nobuyoshi N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Subject: [ruby-dev:34712] Re: [ruby1.9] fork e$B$He(B thread  
Date: Thu, 15 May 2008 14:26:23 +0900  
Message-ID: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

> 1.9e$B$K$Oe(BProcess.detache$B$H$$$&%a%=%C%I$b$"$j$^$9!#$^$?!"e(Bforke$B$N$J$$e(B  
> e$B4D6-$b9M$($l$P!"e(Bfork+exece$B$h$j$be(BProcess.spawne$B$r;H$&$[$&$,$$$$$H;We(B  
> e$B$$$^$9!#e(B
> 
> th = Process.detach(Process.spawn(“…”, “…”)); th.value
> 
> e$B$3$l$bF1$8$h$&$KF0$+$J$$$G$7$g$&$+!#e(B

## e$B$\*$C$7$c$kDL$je(B spawn e$B$r;H$&$Y$-$G$7$?$,!$$=$l$O$=$l$H$7$F!$e(B e$B$$$?$@$$$?%a!\<%k$N$h$&$Ke(B detach e$B$9$k$N$G$OF0$-$^$;$s!%e(B

$ irb19  
irb(main):001:0\> th = Process.detach(Process.spawn(‘kterm’))  
=\> #\<Thread:0xb7a19944 run\>  
… kterm e$B$OF0$+$7$?$^$^e(B …  
irb(main):002:0\> th  
=\> #\<Thread:0xb7a19944 dead\> \<== e$B%W%m%;%9$N=\*N;$rBT$F$:$K;`K4e(B  
irb(main):003:0\> th =  
Thread.new{Process.waitpid(Process.spawn(‘kterm’))}  
=\> #\<Thread:0xb7a14034 run\>  
irb(main):004:0\> th  
=\> #\<Thread:0xb7a14034 sleep\>  
irb(main):005:0\> th.value \<== e$B$3$A$i$Oe(B OK  
=\> 1092

---

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 15, 2008, 7:27am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/6 "2008-05-15T07:27:19Z")

</div>

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

At Thu, 15 May 2008 14:03:58 +0900,  
Hidetoshi NAGAI wrote in [ruby-dev:34711]:

> e$B$$$:$l$K$;$h!$e(Bth = Thread.new{Process.waitpid(fork{…})} e$B$J$I$He(B  
> e$B$7$F$\*$$$Fe(B th.join e$B$H$$$&$h$&$K$G$b$9$k$7$+$J$5$=$&$G$9$M!%e(B(;\_😉

1.9e$B$K$Oe(BProcess.detache$B$H$$$&%a%=%C%I$b$"$j$^$9!#$^$?!"e(Bforke$B$N$J$$e(B  
e$B4D6-$b9M$($l$P!"e(Bfork+exece$B$h$j$be(BProcess.spawne$B$r;H$&$[$&$,$$$$$H;We(B  
e$B$$$^$9!#e(B

th = Process.detach(Process.spawn("…", “…”)); th.value

e$B$3$l$bF1$8$h$&$KF0$+$J$$$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Hidetoshi\_NAGAI](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/49beb7/32.png) [@Hidetoshi\_NAGAI](https://www.ruby-forum.com/u/Hidetoshi_NAGAI)\
**Post date:** [May 15, 2008, 8:42am UTC](https://www.ruby-forum.com/t/ruby1-9-fork-b-h-b-thread/137580/7 "2008-05-15T08:42:26Z")

</div>

e$B1J0f!wCNG=!%6e9)Bg$G$9!%e(B

From: “KUBO Takehiro” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Subject: [ruby-dev:34714] Re: [ruby1.9] fork e$B$He(B thread  
Date: Thu, 15 May 2008 15:27:19 +0900  
Message-ID:  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

> e$B;d$N4D6-e(B Linux kernel 2.6.22, glibc 2.6.1 e$B$G$Oe(B  
> pid = fork { exec ‘xterm’ }  
> Thread.new{ Process.waitpid(pid) }.value  
> e$B$,F0$-$^$7$?!#e(B(kterm e$B$OF~$l$F$J$$$N$Ge(B xterm e$B$GBeMQe(B)
> 
> glibc e$B$N%P!\<%8%g%s$,8E$$$+4D6-JQ?te(B LD\_ASSUME\_KERNEL e$B$re(B  
> e$B@\_Dj$7$F$$$k$+$N$I$A$i$+$G$O$J$$$+$H!#e(B

glibc e$B$Oe(B 2.3.3 e$B$G$7$?!%e(B  
e$B$\*$C$7$c$i$l$?4D6-JQ?t$O@\_Dj$7$F$$$J$$e(B (e$B8+Ev$?$i$J$$e(B)  
e$B$N$G!$e(B  
e$B$I$&$d$ie(B glibc e$B$,8E$9$.$k$H$$$&$3$H$N$h$&$G$9$M!%e(B

e$B$H$O$$$(!$8=4D6-$OHsBP1~$K$9$k$H$$$&$o$1$K$b$$$+$J$$$7!%!%!%e(B(^_^;  
e$B$I$&$9$k$+9M$($F$_$^$9!%e(B  
e$B$"$j$,$H$&$4$6$$$^$7$?!%e(B