[B! c] s5otã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

s5ot id:s5ot

cã«é–¢ã™ã‚‹s5otã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (8)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

Super Technique è¬›åº§ï½žungetcã£ã¦ã©ã†ä½¿ã†ï¼Ÿ
ungetc ã£ã¦ã©ã†ä½¿ã†ï¼Ÿ stdio.h ã«ã¯ã€ã‚ã¾ã‚Šä½¿ã‚ãªã„é–¢æ•°ã‚‚å¤šã„ãŒã€ç‰¹ã«ã“ã® ungetc(3) ã¯ã€ç‰¹åˆ¥ãªãƒ†ã‚¯ãƒ‹ãƒƒã‚¯ã¨å…±ã«ä½¿ã‚ã‚Œã‚‹ã‚‚ã®ãªã®ã§ã€çŸ¥ã‚‰ãªã„ãƒ—ãƒã‚°ãƒ©ãƒžã¯çµ¶å¯¾çŸ¥ã‚‰ãªã„ãŒã€ä½¿ã„æ–¹ã‚’çŸ¥ã£ã¦ã„ã‚‹ãƒ—ãƒã‚°ãƒ©ãƒžã«ã¨ã£ã¦ã¯ã€éžå¸¸ã«æ±Žç”¨çš„ã«ä½¿ãˆã‚‹é–¢æ•°ï¼ˆã¨ã„ã†ã‹ã‚¢ã‚¤ãƒ‡ã‚¢ï¼‰ãªã®ã§ã‚ã‚‹ã€‚ç†è€…ã¯ã‚¤ãƒ³ã‚¿ãƒ—ãƒªã‚¿ãŒå¾—æ„ãªã®ã§ã€ã“ã® ungetc(3) ã¯å¿…é ˆã‚¢ã‚¤ãƒ†ãƒ ã®ä¸€ã¤ãªã®ã§ã‚ã‚‹ã€‚ã¨ã„ã†ã‚ã‘ã§ã€ungetc(3) ã®ä½¿ã„æ–¹ã‚’è§£èª¬ã—ã‚ˆã†ã€‚ ã¨ã¯ã„ãˆã€ã“ã® ungetch.htm ã¯çµæ§‹æ°—åˆã„ã‚’å…¥ã‚Œã¦æ›¸ã„ãŸã«ã‚‚é–¢ã‚ã‚‰ãšã€ã‚¢ã‚¯ã‚»ã‚¹ãŒå°‘ãªã„ï¼ é‡è¦ãªãƒ†ã‚¯ãƒ‹ãƒƒã‚¯ãªã‚“ã ã‘ã©ã€ä¸€èˆ¬èªçŸ¥ãŒä½Žã„ãªï¼ ã“ã‚ŒãŒã‚¯ãƒ¤ã‚·ã‚¤ã®ã§ã€ã“ã“ã«BNFã®ã¡ã‚ƒã‚“ã¨ã—ãŸè§£èª¬ã‚’å…¥ã‚Œã‚‹ã“ã¨ã«ã™ã‚‹ã€‚å‰åŠã‚‚ã¡ã‚ƒã‚“ã¨èªã‚€ã®ã ãžï¼ å—å¥ã®å…ˆèªã¿ å˜ç´”ãªæ•°å¼å‡¦ç† è‡ªç„¶æ•°å¼å‡¦ç† lex ã¨ yacc å—å¥ã®å…ˆèªã¿ ungetc(3) ã¯æ–‡å—åˆ—ã‚’ãƒˆãƒ¼ã‚¯ãƒ³
s5ot 2008/06/26
c

programming
ãƒªãƒ³ã‚¯
Boehm GCã‚’ä½¿ãŠã†
ã¯ã˜ã‚ã« Cã‚„C++ã§ã‚ã‚‹ç¨‹åº¦å¤§ããªãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æ›¸ãå ´åˆï¼Œæœ€å¤§ã®å•é¡Œç‚¹ã¯ ãƒ¡ãƒ¢ãƒªç®¡ç†ã§ã‚ã‚‹ï¼Žè¤‡é›‘ãªãƒ—ãƒã‚°ãƒ©ãƒ ã®å ´åˆï¼Œå¿…è¦ãªãƒ¡ãƒ¢ãƒªã®é‡ã‚’ ã‚ã‚‰ã‹ã˜ã‚è¦‹ç©ã£ã¦ãŠãã®ãŒé›£ã—ã„ã‹ã‚‰ï¼Œãƒ¡ãƒ¢ãƒªãŒå¿…è¦ã«ãªã£ãŸ æ™‚ç‚¹ã§ãƒ¡ãƒ¢ãƒªã‚’ç¢ºä¿ã—ï¼Œä¸è¦ã«ãªã£ãŸã‚‰ãã‚Œã‚’è§£æ”¾ã™ã‚‹ã¨ã„ã† ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚¹ã‚¿ã‚¤ãƒ«ãŒä¸€èˆ¬çš„ã ï¼ŽCã§è¨€ãˆã°ã“ã‚“ãªæ„Ÿã˜ã ï¼Ž char *x; ... x = (char*)malloc(n*sizeof(char)); ... x ã‚’ä½¿ã£ã¦ä»•äº‹ã‚’ã™ã‚‹ ... free(x); ã“ã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚¹ã‚¿ã‚¤ãƒ«ã®å•é¡Œç‚¹ã¯ï¼ŒãŠãŠã¾ã‹ã«è¨€ã£ã¦ ã“ã‚“ãªã¨ã“ã‚ã ã‚ã†ï¼Ž free(x) ã‚’å¿˜ã‚Œã‚‹ã¨ï¼Œãƒ—ãƒã‚»ã‚¹ãŒã©ã‚“ã©ã‚“å¤§ãããªã£ã¦ã—ã¾ã†ï¼Ž free() ã—ã¦ã¯ã„ã‘ãªã„ã‚‚ã®ã‚’é–“é•ã£ã¦free()ã™ã‚‹(ãŸã¨ãˆã°ï¼ŒåŒã˜ ãƒ¡ãƒ¢ãƒªã‚’2å›ž free() ã—ã¦ã—ã¾ã†ã¨ã‹)ã¨ï¼Œãã® free() ã®ä¸ã§ãªãï¼Œ å…¨ç„¶é•ã†å ´æ‰€ã§ã‚¨ãƒ©ãƒ¼ãŒç™ºç”Ÿã™
s5ot 2008/06/23
gc

c

boehmgc
ãƒªãƒ³ã‚¯
Manpage of GETS
Section: Linux Programmer's Manual (3) Updated: 2008-08-06 Index JM Home Page roff page åå‰ fgetc, fgets, getc, getchar, gets, ungetc - æ–‡å—ã¨æ–‡å—åˆ—ã®å…¥åŠ› æ›¸å¼ #include <stdio.h> int fgetc(FILE *stream); char *fgets(char *s, int size, FILE *stream); int getc(FILE *stream); int getchar(void); char *gets(char *s); int ungetc(int c, FILE *stream); èª¬æ˜Ž fgetc() ã¯ã€ stream ã‹ã‚‰æ¬¡ã®æ–‡å—ã‚’ unsigned char ã¨ã—ã¦èªã¿ã€ int ã«ã‚ãƒ£ã‚¹ãƒˆã—ã¦è¿”ã™ã€‚ãƒ•
s5ot 2008/06/23
man

c
ãƒªãƒ³ã‚¯
mmap (ãƒ¡ãƒ¢ãƒªãƒžãƒƒãƒ—ãƒˆãƒ•ã‚¡ã‚¤ãƒ«) : kei@sodan
Linux/Unixã®ãƒ¡ãƒ¢ãƒªå‘¨ã‚Šã§å¤§æ´»èºã®ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã€mmapã®è§£èª¬ã§ã™ã€‚ ã‚¹ãƒ©ã‚¤ãƒ‰(pdf), (pptx), (ppt) ä¸Šè¨˜ã‚¹ãƒ©ã‚¤ãƒ‰åŠã³ã“ã®ãƒšãƒ¼ã‚¸ã®å†…å®¹ã®å¤§éƒ¨åˆ†ã¯ã€(åƒ•ãŒå—ã‘ãŸ) ç”°æµ¦å…ˆç”Ÿ ã®æŽˆæ¥ã‚ªãƒšãƒ¬ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã®6å›žç›®ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã¨åŒã˜ã§ã™ã€‚ ã‚ã¨ã€mallocä¸ã®mmap()ã¾ã‚ã‚Šã‚’èª¿ã¹ã¦ãã‚Œã¦ã‚ã‚ŠãŒã¨ã†>ç ”ç©¶å®¤ã®kennyãã‚“ ãƒ•ã‚¡ã‚¤ãƒ«ã¨ãƒ¡ãƒ¢ãƒª mmap()ã®APIãƒ»ä½¿ã„æ–¹ (mallocã®ä¸èº«ã®è©±é¡Œ) mmap()ã®å®Ÿè£…
s5ot 2008/06/12
c

mmap
ãƒªãƒ³ã‚¯
fast strlen and memchr by SSE2 (mitsunari@cybozu labs)
strlen()ã¨memchr()ã®SIMDç‰ˆã‚’ä½œã£ã¦ã¿ã¾ã—ãŸï¼Ž ä»Šå›žã¯æœ€é€Ÿã‚ˆã‚Šã‚‚ãŠæ‰‹è»½ã•ã‚’é‡è¦–ã—ãŸã®ã§ã‚¢ã‚»ãƒ³ãƒ–ãƒªè¨€èªžã§ã¯ãªãintrinsicé–¢æ•°ã‚’ä½¿ã£ã¦ã„ã¾ã™ï¼Žãã®ãŸã‚Visual Studio 2008, gcc 4.xã®ä¸¡æ–¹ã§ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã§ã32-bit, 64-bit OSä¸Šã§å‹•ä½œã—ã¾ã™ï¼Ž Windowsã¨Linuxã§ã®ã¿ç¢ºèªã—ã¦ã„ã¾ã™ãŒæã‚‰ãIntel Mac OS Xä¸Šã§ã‚‚å‹•ä½œã™ã‚‹ã§ã—ã‚‡ã†(sample source)ï¼Ž ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ã¯ãƒ©ãƒ³ãƒ€ãƒ ãªé•·ã•ã®æ–‡å—åˆ—ã®å¹³å‡é•·(average length)ã‚’å¤‰åŒ–ã•ã›ã¤ã¤å–ã‚Šã¾ã—ãŸï¼Žæ•°å€¤ã¯1byteã‚ãŸã‚Šã«ã‹ã‹ã£ãŸå‡¦ç†æ™‚é–“æ¯”ã§å°ã•ã„ã»ã©é€Ÿã„ã“ã¨ã‚’è¡¨ã—ã¾ã™ï¼Ž strlenãŒ3ç¨®é¡ž(ANSI, BLOG, SSE2)ã¨memchrãŒ2ç¨®é¡ž(ANSI, SSE2)ã‚ã‚Šã¾ã™ï¼ŽBLOGã¨ã„ã†ã®ã¯ä»Šå›žè©¦ã—ã¦ã¿ã‚ˆã†ã¨ã„ã†ãã£ã‹ã‘ã«ãªã£ãŸCounting
s5ot 2008/06/11
ã™ã”ãã†

simd

c
ãƒªãƒ³ã‚¯
ç¬¬2ç« ã€€SIMDãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®åŸºç¤Ž - PS3 Linux Information Site / Cell/B.E.ã®ãƒ‘ãƒ¯ãƒ¼ã‚’ä½“é¨“ã—ã‚ˆã†
å‡ºå…¸: PS3 Linux Information Site / Cell/B.E.ã®ãƒ‘ãƒ¯ãƒ¼ã‚’ä½“é¨“ã—ã‚ˆã† ç¬¬1ç« ã§ã¯ã€Cellãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®ç‰¹å¾´ã«ã¤ã„ã¦è§£èª¬ã—ã¾ã—ãŸã€‚æœ¬ç« ã§ã¯ã€Cellãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®ç‰¹å¾´ã®1ã¤ã§ã‚ã‚‹ã€SIMDæ¼”ç®—ã‚’åˆ©ç”¨ã—ãŸãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°æ‰‹æ³•ã«ã¤ã„ã¦è§£èª¬ã—ã¾ã™ã€‚ SIMDæ¼”ç®—ã¯ã€è¤‡æ•°ã®ãƒ‡ãƒ¼ã‚¿ã«å¯¾ã™ã‚‹å‡¦ç†ã‚’1å‘½ä»¤ã§å®Ÿè¡Œã§ãã‚‹æ¼”ç®—æ‰‹æ³•ã§ã™ã€‚ã“ã®ã‚ˆã†ãªæ‰‹æ³•ã¯ã€ãƒžãƒ«ãƒãƒ¡ãƒ‡ã‚£ã‚¢ãƒ»ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®éŸ³å£°ãƒ»ç”»åƒå‡¦ç†ã‚„3Dã‚°ãƒ©ãƒ•ã‚£ãƒƒã‚¯ã‚¹ã®æ¼”ç®—å‡¦ç†ãªã©ã§å¤šãåˆ©ç”¨ã•ã‚Œã¦ã„ã¾ã™ã€‚è¿‘å¹´ã€å¤šãã®ãƒ—ãƒã‚»ãƒƒã‚µãŒSIMDæ¼”ç®—å°‚ç”¨ã®å‘½ä»¤ (ä»¥ä¸‹ã€SIMDå‘½ä»¤) ã‚’å®Ÿè£…ã—ã¦ãŠã‚Šã€ä¾‹ãˆã°Intel x86ã¯SSEå‘½ä»¤ã‚„MMXå‘½ä»¤ã¨ã„ã£ãŸSIMDå‘½ä»¤ã‚’ãƒžãƒ«ãƒãƒ¡ãƒ‡ã‚£ã‚¢æ‹¡å¼µæ©Ÿèƒ½ã¨ã—ã¦æä¾›ã—ã¦ã„ã¾ã™ã€‚ä¸€æ–¹ã€æœ¬ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã§å¯¾è±¡ã¨ã—ã¦ã„ã‚‹Cellã§ã¯SIMDå‘½ä»¤ã¨ã—ã¦ã€PPEã«VMXå‘½ä»¤ã€SPEã«SPU SIMDå‘½
s5ot 2008/06/11
simd

c
ãƒªãƒ³ã‚¯
Rubyæ‹¡å¼µãƒ©ã‚¤ãƒ–ãƒ©ãƒªä½œæˆãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«
ç›®æ¬¡ æº–å‚™ ã¾ãšã¯Cè¨€èªžãƒ—ãƒã‚°ãƒ©ãƒ ã‚’å‘¼ã³å‡ºã™ ç°¡å˜ãªæ•°å€¤ã®ã‚„ã‚Šã¨ã‚Š NArrayé…åˆ—ã‚’æ¸¡ã™ Swigã‚’ä½¿ã£ã¦ãŠæ‰‹è»½å¤‰æ› å‚è€ƒæ–‡çŒ® æº–å‚™ ã“ã®ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã§ã¯Ruby 1.8ç³»åˆ—ã®ä½¿ç”¨ã‚’å‰æã«ã—ã¦ã„ã¾ã™ã€‚ ç¢ºèªã¯ã™ã¹ã¦Ruby 1.8.4 [i386-Cygwin]ã§è¡Œã„ã¾ã—ãŸã€‚ NArrayã¯Version 0.5.8ã‚’ç”¨ã„ã¦ã„ã¾ã™ã€‚ ã¾ãŸãã‚Œä»¥å¤–ã«ä»¥å¤–ã«ä»¥ä¸‹ã®ã‚‚ã®ãŒå¿…è¦ã§ã™ã€‚ Cã‚³ãƒ³ãƒ‘ã‚¤ãƒ© Rubyã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã«ç”¨ã„ãŸã‚‚ã®ã¨åŒã˜ã‚‚ã®ãŒå¿…è¦ã§ã™ã€‚ ãƒã‚¤ãƒŠãƒªãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ã‚’å°Žå…¥ã—ãŸå ´åˆã¯ã©ã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã§ãƒ“ãƒ«ãƒ‰ã•ã‚ŒãŸã‚‚ã®ã‹ çŸ¥ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ãŒã€UNIXç³»ã§ã¯ãŸã„ã¦ã„gccã§ã™ã€‚ ruby.h, mkmf.rb Rubyã‚’ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‹ã‚‰è‡ªåˆ†ã§ãƒ“ãƒ«ãƒ‰ã—ãŸå ´åˆã¯ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã•ã‚Œã¦ã„ã‚‹ã¨ æ€ã„ã¾ã™ãŒã€ãƒã‚¤ãƒŠãƒªãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ã‚’å°Žå…¥ã—ãŸå ´åˆã¯ruby.hã‚„mkmf.rbãŒã‚ã‚‹ã‹ ç¢ºèªã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚é–‹ç™º
s5ot 2008/06/04
ruby

c
ãƒªãƒ³ã‚¯
LoveRubyNet Wiki: RubyExtensionProgrammingGuide
2008-01-09 15:51:08 +0900 (275d); rev 19 ã“ã‚Œã¯è‰ç¨¿ã§ã™ã€‚ ã„ãšã‚Œæ£å¼ãªã¨ã“ã‚ã«ç§»ã™äºˆå®šã€‚ å¯¾è±¡ã¨ã™ã‚‹èªè€… æœ¬ç¨¿ã¯ä»¥ä¸‹ã®ã‚ˆã†ãªèªè€…ã‚’å¯¾è±¡ã«ã—ã¦ã„ã¾ã™ã€‚ Ruby ã®æ‹¡å¼µãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’æ›¸ã„ãŸã“ã¨ãŒãªã„ C ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ãŒãã‚Œãªã‚Šã«ã§ãã‚‹ Ruby ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ãŒãã‚Œãªã‚Šã«ã§ãã‚‹ 2 ã«é–¢ã—ã¦ã€‚ ã€Œãƒã‚¤ãƒ³ã‚¿ã£ã¦ä½•ï¼Ÿã€ãƒ¬ãƒ™ãƒ«ã®äººã¯ä¸å¯ã§ã™ã€‚ æ§‹é€ ä½“ã¨ãƒã‚¤ãƒ³ã‚¿ã‚’ã¡ã‚ƒã‚“ã¨ä½¿ã£ã¦ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®ã§ãã‚‹äººã‚’å¯¾è±¡ã¨ã—ã¾ã™ã€‚ 3 ã«é–¢ã—ã¦ã€‚ ä»¥ä¸‹ã®ãƒ—ãƒã‚°ãƒ©ãƒ ã®çµæžœãŒã©ã†ãªã‚‹ã‹ã€ è€ƒãˆã‚‹ã ã‘ã§ã‚ã‹ã‚‹ã‚ˆã†ã«ã—ã¦ãŠã„ã¦ãã ã•ã„ã€‚ class C p self # ä½•ãŒè¡¨ç¤ºã•ã‚Œã‚‹ï¼Ÿ def C.m puts '1' p self end def m puts '2' p self end end C.m # ä½•ãŒè¡¨ç¤ºã•ã‚Œã‚‹ï¼Ÿ C.new.m # ä½•ãŒè¡¨ç¤ºã•ã‚Œã‚‹ï¼Ÿ ã“ã®ãƒžãƒ‹ãƒ¥
s5ot 2008/06/04
ruby

c
ãƒªãƒ³ã‚¯
1