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$BA0$N%P!<%8%g%s(B (Dec 26 1995) $B$+$i$NJQ99E@$O(B:
* $B%2!<%`%]!<%H$N%W%m%0%i%_%s%0$K4X$9$k>pJs(B
* C $B0J30$N8@8l(B
* nanosleep()
* $B%Z%s%F%#%"%`%W%m%;%C%5$N%?%$%_%s%0(B
* $B%3!<%G%$%s%0Nc$rDI2C(B
* $B$?$/$5$s$N>.$5$J=$@5(B
$B$J$I$G$9!#(B
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I/O $B%]!<%H$r%"%/%;%9$9$k$?$a$N%k!<%A%s$O(B/usr/include/asm/io.h ($B$^$?$O(B
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#include <asm/io.h>
$B$H$9$k$@$1$G==J,$G$7$g$&!#(B
$BFCJL$J%i%$%V%i%j$J$I$OITMW$G$9!#(B
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$BA0$N%P!<%8%g%s(B)$B$r;H$&$H$-$K!"e(B)$B$+!"(B
$B$=$&$G$J$1$l$P(B asm/io.h $B$r%$%s%/%k!<%I$9$kA0$K(B
#define extern
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num $B$O!"(Bfrom $B$+$i$$$/$D$NO"B3%"%I%l%9$N%"%/%;%9$r5v$9$+!#(B
$B$r;XDj$7$^$9!#(B
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$BM?$($k$N$+6X;_$9$k$N$+$rO@M}CM(B(true : 1 = $B5v2D$rM?$($k(B, false : 0 = $B5v2D$r(B
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$BO"B3$7$F$$$J$$%]!<%H$N>l9g$K$O!"J#?t2s(B ioperm() $B$r8F$S=P$7$F!"E,@Z$J5v2D$r(B
$B;XDj$7$^$9!#(B
ioperm() $B$N>\:Y$JJ8K!$K4X$7$F$O(B ioperm(2) $B$N%^%K%e%"%k%Z!<%8$r;2>H$7$F2<$5$$!#(B
ioperm() $B$r8F$S=P$9$K$O!"$=$N%W%m%0%i%`$,(B root $BFC8"$GAv$C$F$$$k$3$H$,(B
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asm/io.h $B$r%$%s%/%k!<%I$9$kA0$K(B REALLY_SLOW_IO $B$r(B #define $B$9$k$H!"(B
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processor : 0
cpu : 586
model : 7
vendor_id : GenuineIntel
stepping : unknown
fdiv_bug : no
hlt_bug : no
fpu : yes
fpu_exception : yes
cpuid : yes
wp : yes
flags : fpu vme de pse tsc msr mce cx8
bogomips : 40.03
$B$H$J$j$^$9!#(B)
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/usr/src/linux/kernel/sched.c $B$r8+$k8B$j!"$=$N=q<0(B($B8F$S=P$7J}(B)$B$O(B:
int nanosleep(struct timespec *rqtp, struct timespec *rmtp);
$B$N$h$&$G$9!#(B
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1/50000000 $BIC$G$9!#(B
Instruction i386 clock cycles i486 clock cycles
nop 3 1
xchg %ax,%ax 3 3
or %ax,%ax 2 1
mov %ax,%ax 2 1
add %ax,0 2 1
[$B=PE8(B: Borland Turbo Assembler 3.0 Quick Reference]
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extern __inline__ unsigned long long int rdtsc()
{
unsigned long long int x;
__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
return x;
}
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