e$B%^%7%s$NIi2Y$,9b$$$H$-$K!"%^%k%A%9%l%C%I%W%m%0%i%`$N=hM}$,?Je(B
e$B$^$J$$$3$H$,$"$j$^$9!#e(B
e$B0J2<$N%W%m%0%i%`$O%Q%$%W$Ke(B 1e$BICKh$Ke(B “a”
e$B$r=q$-9~$s$G!"$=$l$re(B
e$BB>$N%9%l%C%I$+$ie(B sysread e$B$GFI$=P$7$F!"FI$=P$7$K$+$+$C$?;~e(B
e$B4V$rI=<($9$k$b$N$G$9!#e(B
% cat /etc/debian_version
4.0
% uname -a
Linux nute 2.6.18-6-486 #1 Fri Dec 12 16:18:30 UTC 2008 i686 GNU/Linux
% ruby -ve ’
p $$
r, w = IO.pipe
Thread.new {
begin
t1 = Time.now
loop {
s = r.sysread(10)
t2 = Time.now
p [t2-t1, s]
t1 = t2
}
ensure
p $!
end
}
loop { w.write “a”; sleep 1 }
’
ruby 1.9.2dev (2009-02-15 trunk 22328) [i686-linux]
16259
[1.5086e-05, “a”]
[1.001370774, “a”]
[1.004141531, “a”]
[1.004539908, “a”]
[1.003810203, “a”]
[1.003755167, “a”]
[1.004224783, “a”]
[1.003889822, “a”]
[1.004372847, “a”]
[2.163765927, “a”]
[15.54612696, “a”]
[1.009049164, “a”]
[1.002022536, “a”]
…
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1e$BICKh$Ke(B
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e$B7k2L$G$9!#e(B
% ruby -e ‘loop {}’
e$B$3$NIi2Y$re(B ^C e$B$G=*$o$i$;$?8e$O$U$D$&$K?J$_=P$7$^$9!#e(B
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e$B$=$l$J$i$J$K$r$7$F$s$N$+!"$H$$$&$3$H$Ge(B strace e$B$9$k$H!"e(B
e$B$/$j$+$($7e(B sched_yield() e$B$7$F$k$h$&$G$9!#e(B
% strace -p 16259
Process 16259 attached - interrupt to quit
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
…
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- e$B$3$N5sF0$O$I$Ne(B OS e$B$G5/$3$k$N$+e(B
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(e$B$"$k$$$ON>J}$+e(B)
e$B$"$H!"$3$3$G%F%9%H$7$?%^%7%s$O%7%s%0%k%W%m%;%C%5$G$9!#%^%k%Ae(B
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