[B! x86] kazuhookuã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

kazuhooku id:kazuhooku

x86ã«é–¢ã™ã‚‹kazuhookuã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (13)

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Native Clientã®ä»•çµ„ã¿ã¯ã©ã†ãªã£ã¦ã„ã‚‹ã®ã‹ï¼Ÿ - ã‚„ãã†ã‚‰ãŠâˆ’ã‚ˆã£ã¡ã‚ƒã‚“ã‚¤ã‚«ã¯ã—ã°ã‚‰ãè²·ã‚ãšã«iPhoneã ã‘ã«æ³¨åŠ›ã™ã‚‹ç”·
GoogleãŒã€Webãƒ–ãƒ©ã‚¦ã‚¶ä¸Šã§ãƒã‚¤ãƒ†ã‚£ãƒ–ãƒã‚¤ãƒŠãƒªã‚³ãƒ¼ãƒ‰ã‚’å®Ÿè¡Œã™ã‚‹ã€ŒNative Clientã€ã‚’å…¬é–‹ã—ãŸã€‚ Native Client http://code.google.com/p/nativeclient/ Google Earth,Quakeãªã©ãŒã™ã§ã«å‹•ã„ã¦ã„ã‚‹ã‚ˆã†ã ã€‚ ã“ã‚Œã¯ã™ã”ã„ï¼ãƒ–ãƒ©ã‚¦ã‚¶ä¸Šã§X86ãƒã‚¤ãƒŠãƒªã‚’å‹•ã‹ã™ã€ŒNative Clientã€ http://www.moongift.jp/2008/12/native_client/ ã‚µãƒ³ãƒ‰ãƒœãƒƒã‚¯ã‚¹ã§å®‰å…¨æ€§ç¢ºä¿ã€ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰5ï¼… ãƒ–ãƒ©ã‚¦ã‚¶ã§x86ãƒã‚¤ãƒŠãƒªå®Ÿè¡Œã€ã‚°ãƒ¼ã‚°ãƒ«ãŒæ–°æŠ€è¡“ http://www.atmarkit.co.jp/news/200812/09/nacl.html ã‚ã¨ã€ã‚µãƒ³ãƒ—ãƒ«ã®life.ccã«SDL_surfaceã¨æ›¸ã„ã¦ã‚ã‚‹ã®ã§SDLã®æç”»ã¾ã‚ã‚ŠãŒæ—¢ã«å‹•ã„ã¦ã„ã‚‹ã®ã ã‚ã†ã‹ã‚‰ã€ä»Šå¾Œã€ãŸãã•ã‚“ã®ã‚¢ãƒ—ãƒªãŒN
kazuhooku 2008/12/11
ã‚ˆãã¾ã¨ã¾ã£ã¦ã‚‹ã€‚ã§ã‚‚ã€ã“ã‚Œã¯é™çš„æ¤œè¨¼ã¨å‹•çš„ã‚¨ãƒ©ãƒ¼ã‚’æ··åŒã—ã¦ã‚‹ã‚“ã˜ã‚ƒãªã„ã‹ãªãï¼žã€Œãƒ—ãƒã‚°ãƒ©ãƒ ã«ã“ã†ã„ã†åˆ¶ç´„ã‚’ä¸Žãˆã¦ã€ã‚ã‚‰ã‚†ã‚‹ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’Ring0ã§å‹•ã‹ã›ã°Ringã‚’åˆ‡ã‚Šæ›¿ãˆã‚‹ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰ãŒç„¡ããªã‚‹ã€

dev

x86
ãƒªãƒ³ã‚¯
é©å‘½ã®æ—¥ã€…ï¼ [kernel watchæ²¡ãƒã‚¿é›†] long nop ãƒãƒˆãƒ«
x86ã«ã¯æ§˜ã€…ãªNOPãŒã‚ã‚Šã€IntelÂ® 64 and IA-32 Architectures Software Developerâ€™s Manual ã«è¨˜è¼‰ã®ã‚ã‚‹ã‚‚ã®ã ã‘ã§ã‚‚1byteé•·ã‹ã‚‰9byteé•·ã¾ã§ã®ç¨®é¡žãŒã‚ã‚‹ã€‚ ã“ã‚Œã«prefixç‰ã®é¸æŠžè‚¢ã‚’è€ƒãˆã‚‹ã¨ã€ã¾ã•ã«ç„¡é™ã«åºƒãŒã‚‹å¤§å®‡å®™ã€‚ã¨ã„ã£ãŸæ„Ÿã˜ã®å¯èƒ½æ€§ã®åºƒã•ã§ã‚ã‚‹ã€‚ ã§ã€LKMLå†…ã§ã¯NOPã®ç¨®é¡žã«ã‚ˆã£ã¦é€Ÿåº¦ãŒå¤‰ã‚ã‚‹ã“ã¨ãŒåºƒãçŸ¥ã‚‰ã‚Œã¦ã„ã¦ã€æ™‚æŠ˜ã©ã®NOPã‚’ä½¿ã†ã®ãŒã‚ˆã„ã‹ãŒç†±ã„è°è«–ã«ãªã‚‹ã€‚ ç‰¹ã«è¿‘å¹´ã¯è‡ªå·±æ›¸ãæ›ãˆã‚³ãƒ¼ãƒ‰ã®éƒ½åˆã§æœ€é€Ÿ5byte NOPè°è«–ãŒç†±ã„ï¼ˆlong jumpãŒ5byteã ã‹ã‚‰ãï¼‰ã€‚ ã¾ã‚ã€5byte NOPã¨3byte NOP + 2byte NOPï¼ˆã¨prefix NOPï¼‰ã®ã©ã‚ŒãŒé€Ÿã„ã‹ã€ãªã‚“ã¦è°è«–ã¯ã€è‡ªè»¢è»Šç½®ãå ´ç†è«–ã«ã‚ˆã£ã¦ç„¡é§„ã«ã‚¹ãƒ¬ãƒƒãƒ‰ãŒã®ã³ã¦ã„ãã®ã§è¦‹ã¦ã„ã¦æ¥½ã—ã„ï¼ˆã»ã‚“ã¨ã‹ï¼Ÿï¼‰ ã§ã€æœ€è¿‘è©±é¡Œã«ãªã£ãŸã®ã¯l
kazuhooku 2008/10/03
x86
ãƒªãƒ³ã‚¯
hotpatch - firewood's diary
NyaRuRuã•ã‚“ã®ã¨ã“ã‚ã‚’èªã‚“ã§ã„ãŸã‚‰ã€2003server/Vistaã§ã¯hotpatchãŒå¯èƒ½ã¨ã®ã“ã¨ã€‚ï¼ˆè©±é¡ŒãŒäºŒå¹´é…ã‚Œï¼‰ è¦ã™ã‚‹ã« DLL ã®ã‚¨ã‚¯ã‚¹ãƒãƒ¼ãƒˆé–¢æ•°ã®å…ˆé ã‚’ jmp å‘½ä»¤ã§æ›¸ãæ›ãˆã¦ã—ã¾ã†ã¨ã„ã†ï¼Œå¤å…¸çš„ãªæ–¹æ³•ã®æ¨¡æ§˜ï¼Ž (snipped) ã“ã‚Œã‚’å®Ÿç¾ã™ã‚‹ã«ã¯ DLL ã®ã‚¨ã‚¯ã‚¹ãƒãƒ¼ãƒˆé–¢æ•°ã®å…ˆé ãŒ 2 byte å‘½ä»¤ã§ãªã„ã¨åŽ„ä»‹ãªãŸã‚ï¼Œã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ãƒ¬ãƒ™ãƒ«ã§è€ƒæ…®ã—ã¦ã‚ã’ã‚‹å¿…è¦ãŒã‚ã£ã¦ï¼Œå®Ÿéš›æœ€è¿‘ã® Visual C++ ã«ã¯ã“ã‚“ãªã‚ªãƒ—ã‚·ãƒ§ãƒ³ãŒè¿½åŠ ã•ã‚Œã¦ã„ã¾ã™ï¼Ž Hot-patching - NyaRuRuã®æ—¥è¨˜ MicrosoftãŒæä¾›ã™ã‚‹hotfixãŒå†èµ·å‹•ä¸è¦ã«ãªã‚‹ã¨ã„ã†ã ã‘ã§ã€ãƒ¦ãƒ¼ã‚¶ãƒ¼ãŒä½œæˆã™ã‚‹DLLã«ã‚‚å¯¾å¿œã—ã¦ã„ã‚‹ã‚ã‘ã§ã¯ãªã„ã‚ˆã†ã ãŒã€ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã‚ªãƒ—ã‚·ãƒ§ãƒ³è‡ªä½“ã¯VC2005ã‹ã‚‰ã‚ã‚‹ã¿ãŸã„ã€‚ /hotpatchã‚’è©¦ã—ã¦ã¿ãŸã¨ã“ã‚ã€ã‚¢ã‚»ãƒ³ãƒ–ãƒªã‚½ãƒ¼ã‚¹ãƒ¬ãƒ™ãƒ«ã§ã¯é–¢æ•°ã®å…ˆé ã«ã€Œnpad
kazuhooku 2008/08/31
dev

x86
ãƒªãƒ³ã‚¯
VX32 Virtual Extension Environment
Vx32: porta ble, efficient, safe execution of untrusted x86 code Bryan Ford Russ Cox Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Techno logy About Vx32 is a user-mode library that can be linked into arbitrary applications that wish to create secure, isolated execution environments in which to run untrusted extensions or plug-ins implemented as native x86 code.
kazuhooku 2008/07/16
dev

vm

x86
ãƒªãƒ³ã‚¯
const char* const p = "ABC"; ã¨ const char q[] = "ABC"; ã¯ã©ã¡ã‚‰ãŒã‚ˆã„ã‹ã€ã¿ãŸã„ãªä¸Žå¤ª - memologue
è«¸äº‹æƒ…ã‚ã£ã¦ã€ãµã¨å‰ã«èªã‚“ã ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã«æ›¸ã„ã¦ã‚ã£ãŸç´°ã‹ã„ã“ã¨ãŒæ°—ã«ãªã£ãŸã€‚ã„ã‚„ã„ã¤ã‚‚ç´°ã‹ã„ã‘ã©ã€‚ const char* const p = "ABC";ã‚ˆã‚Š const char q[] = "ABC";ã®ã»ã†ãŒã„ã„ã®ã‹ï¼Ÿçš„ãªè©±ã€‚å¾Œè€…ã®æ–¹ãŒè‰¯ã„ã‚‰ã—ã„ã®ã§ã€ç¢ºèªã™ã‚‹ã¨ã¨ã¨ã‚‚ã«ã€ã™ãã«ãªã‚“ã§ã‚‚æ›¸ãã®ã¯ã©ã†ãªã‚“ã ã¨æ€ã„ã¤ã¤ã‚‚ç„¡é§„ã«ç´°ã‹ãè§£èª¬ã€‚ã„ã‚ã„ã‚é–“é•ã£ã¦ãŸã‚‰ã‚´ãƒ¡ãƒ³ãƒŠã‚µã‚¤ã€‚Cè¨€èªžå…¥é–€? å…ˆã«çµè«– å…±æœ‰ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚„PIEãªå®Ÿè¡Œãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä½œã‚‹å ´åˆã¯ã€å¾Œè€…ã®æ›¸ãæ–¹(const char q[] = "xxx")ã®ã»ã†ãŒè‰¯ã•ãã†ã§ã™ãã€‚PIEã˜ã‚ƒãªã„å˜ãªã‚‹å®Ÿè¡Œãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä½œã‚‹ã¨ãã¯ã€æœ€é©åŒ–ã‹ã‘ã‚‹ãªã‚‰ã‚ã‚“ã¾ã‚Šã‹ã‚ã‚‰ãªã„ã‹ã‚‚ã€‚ æ¯”è¼ƒ1) ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«æ™‚ã®æœ€é©åŒ–ã®åŠ¹ãã‚„ã™ã• æœ€é©åŒ–ã¨ã„ã£ã¦ã‚‚ã„ã‚ã„ã‚ã‚ã‚Šã¾ã™ãŒã€â†“ã«é™ã£ã¦è¨€ãˆã°ã€const char q[] ã®ã»ã†ãŒåŠ¹ãã‚„ã™ã„ã‚ˆã†ã§ã™ãã€‚ gcc vers
kazuhooku 2008/07/08
ä¸ä¾¿ã§ã™ãªãï¼žã€Œmov 0xã»ã’(%eip) ãµãŒ; ã¨ã‹å‡ºæ¥ã‚Œã°ä¸€ç•ªã„ã„ã‚“ã§ã™ãŒ(x86_64ã¯ã§ãã‚‹)ã€x86ã¯ãã†ã„ã†PCç›¸å¯¾ã®ã‚¢ãƒ‰ãƒ¬ã‚¹æŒ‡å®šã¯ã§ãã¾ã›ã‚“ã€‚ã¨ã„ã†ã‹ã€eipã‚’ç›´æŽ¥çš„ã«å¾—ã‚‹ã“ã¨ã™ã‚‰å‡ºæ¥ã¾ã›ã‚“ã€

dev

x86
ãƒªãƒ³ã‚¯
memcpy performance - IntelÂ® Software Network
memcpy performance abstract Normal usage of memcpy() with gcc presents serious performance issues.Â Implications and some possible avoidance measures are discussed for both 32- and 64-bit builds background linux gcc carries on the Unix tradition from the early days of C, when the run-time libraries weren't considered as part of the compiler.Â Thus, there is little coordination between compiler and
kazuhooku 2008/06/16
autovectorization ã‚’ä½¿ã†ã‚ˆã† memcpy ã‚’ C ã§ç‹¬è‡ªå®šç¾©

dev

x86
ãƒªãƒ³ã‚¯
x86ã‚«ãƒ«ãƒˆã‚¯ã‚¤ã‚º(è§£ç”ç·¨) (mitsunari@cybozu labs)
å•é¡Œç·¨ã¯ã“ã¡ã‚‰ã®x86ã‚«ãƒ«ãƒˆã‚¯ã‚¤ã‚ºã§ã™ï¼Ž Q1 [ä¹—ç®—ã®å‰Šæ¸›] lea eax, [eax + eax*8] lea eax, [eax + eax*4] 45 = 9 * 5 = (8 + 1) * (4 + 1)ã‚’åˆ©ç”¨ã™ã‚‹ï¼Žä¹—ç®—å‘½ä»¤ãŒé€Ÿããªã£ãŸã¨ã¯ã„ãˆï¼Œã¾ã add/sub/shift/leaã®çµ„ã¿åˆã‚ã›ã‚’ä½¿ã£ãŸæ–¹ãŒé€Ÿã„ã“ã¨ãŒå¤šã„ï¼Ž Q2 [æ¡ä»¶åˆ†å²ã®å‰Šæ¸›] cdq xor eax, edx sub eax, edx æ¡ä»¶åˆ†å²ã¯å¯èƒ½ãªé™ã‚Šä½¿ã‚ãªã„ï¼Žæ¬¡ã®äºŒã¤ã®æ’ç‰å¼ -x = x ^ (-1) - (-1) x = x ^ 0 - 0 ã¨ unsigned int m = (x < 0) ? -1 : 0 ã‚’çµ„ã¿åˆã‚ã›ã‚‹ã“ã¨ã§çµ¶å¯¾å€¤ã‚’ unsigned int m = x >> 31; return x ^ m - m; ã¨å®Ÿç¾ã™ã‚‹ï¼Žã“ã“ã§mã‚’å–å¾—ã™ã‚‹éƒ¨åˆ†ã¯ mov edx, eax sa
kazuhooku 2007/10/09
ã€Œç‘£æœ«ãªçŸ¥è˜ã‚’è¦šãˆã‚‹ã‚ˆã‚Šã‚‚ï¼Œå¸¸ã«ä»£æ›¿ãƒã‚¸ãƒƒã‚¯ãŒç„¡ã„ã‹ã‚’è€ƒãˆã‚‹æ–¹ãŒã‚ˆã‚Šã‚ˆã„ã‚³ãƒ¼ãƒ‰ã«ç¹‹ãŒã‚‹ã€

x86

assembler
ãƒªãƒ³ã‚¯
x86ã‚«ãƒ«ãƒˆã‚¯ã‚¤ã‚º (mitsunari@cybozu labs)
x86ã®è§£èª¬ã‚’ã„ã–å§‹ã‚ã¦ã¿ã‚‹ã¨ï¼Œã©ã†ã‚‚blogã¨ã„ã†åª’ä½“ã¯ã‚„ã‚Šã«ãã„ã®ã§åˆ¥ãƒšãƒ¼ã‚¸ã§é€²ã‚ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸï¼Žã™ã„ã¾ã›ã‚“ï¼Žã¾ã¨ã‚ç›´ã™ã¾ã§ã—ã°ã‚‰ããŠå¾…ã¡ãã ã•ã„ï¼Žã‚ã¨åŸºæœ¬çš„ãªã“ã¨ã°ã‹ã‚Šç¶šã„ãŸã®ã§ï¼Œã¡ã‚‡ã£ã¨ãƒžãƒ‹ã‚¢ãƒƒã‚¯ãƒã‚¿ã«èµ°ã£ã¦ã¿ã¾ã™ï¼Ž ã¨ã„ã†ã‚ã‘ã§çªç„¶ã§ã™ãŒã‚¯ã‚¤ã‚ºã§ã™ï¼Žãã“ãã“é«˜ã„é›£æ˜“åº¦ã«è¨å®šã—ãŸã¤ã‚‚ã‚Šã§ã™ãŒï¼Œã„ã‹ãŒã§ã—ã‚‡ã†ï¼Žåˆå¿ƒè€…ã®æ–¹ã¯å…¨ç„¶åˆ†ã‹ã‚‰ãªãã¦ã‚‚å¤§ä¸ˆå¤«ã§ã™ï¼Žã‚ãˆã¦æ›–æ˜§ãªè¨˜è¿°ã‚’ã—ã¦ã„ã‚‹éƒ¨åˆ†ã‚‚ã‚ã‚Šã¾ã™ï¼Žå¾ŒåŠã®ç”ãˆã¯å‡„ã„ã‚‚ã®ãŒã‚ã‚‹ã¨ã„ã„ãªã‚ï¼Žã‚ã¨ï¼Œé›£å•å¥‡å•å‹Ÿé›†ä¸ï¼Ž ä»¥ä¸‹ã¯æ–ã‚ŠãŒãªã„é™ã‚Šï¼Œ ç’°å¢ƒã¯32bit OSä¸Šã®Pentium4ä»¥é™ã®x86 CPU é–¢æ•°ã®å‘¼ã³å‡ºã—è¦ç´„ã¯__cdecl é…åˆ—ã¯16byte alignmentã•ã‚Œã¦ã„ã¦è¤‡æ•°ã®é…åˆ—ã¯ã‚ªãƒ¼ãƒãƒ¼ãƒ©ãƒƒãƒ—ã—ã¦ã„ãªã„ ãƒ«ãƒ¼ãƒ—ã¯4ã®å€æ•°ã¨ä»®å®šã—ã¦ã‚ˆã„ ã‚‚ã®ã¨ã—ã¾ã™ï¼ŽCPUã«ä¾å˜ã™ã‚‹å ´åˆã¯æ˜Žè¨˜ã—ã¦ãã ã•ã„ï¼Ž Q1(5ç‚¹) ç¬¦å·ãªã—eaxã®å€¤ã‚’4
kazuhooku 2007/10/05
ç”ãˆãŒé™ã£ã¦ãã‚‹ã“ã¨ã‚’æœŸå¾…age

x86

assembler

ã“ã‚Œã¯ã™ã”ã„
ãƒªãƒ³ã‚¯
Xbyakã§å§‹ã‚ã‚‹x86(IA-32)å…¥é–€(2-1) (mitsunari@cybozu labs)
å‰å›žè¨€ã„å¿˜ã‚Œã¾ã—ãŸãŒï¼Œã“ã®ã‚·ãƒªãƒ¼ã‚ºã®ç›®æ¨™ã¯LLé‚2007ãƒ‡ãƒ¢ã‚³ãƒ¼ãƒ‰ã®chaos.cppç¨‹åº¦ã®ã‚‚ã®ã‚’èªã‚ã¦ç†è§£ã§ãã‚‹ã“ã¨ã‚’è€ƒãˆã¦ã„ã¾ã™ï¼Ž å…·ä½“çš„ã«ã¯ ãƒ¬ã‚¸ã‚¹ã‚¿ã‚„ã‚¹ã‚¿ãƒƒã‚¯ã‚’ç†è§£ã™ã‚‹ é–¢æ•°ã‚’ä½œã‚Œã‚‹ SIMDå‘½ä»¤ã®åŸºç¤Žã‚’çŸ¥ã‚‹ JITã®ãƒ¡ãƒªãƒƒãƒˆã‚’ç†è§£ã™ã‚‹ ã‚ãŸã‚Šã‚’ç›®æŒ‡ã—ã¾ã™ï¼ŽãªãŠï¼ŒJITã‚¢ã‚»ãƒ³ãƒ–ãƒ©ã¯é€šå¸¸ã®ã‚¢ã‚»ãƒ³ãƒ–ãƒ©ã«æ¯”ã¹ã¦ãƒ¯ãƒ³ã‚¯ãƒƒã‚·ãƒ§ãƒ³æ¦‚å¿µãŒå¿…è¦ã«ãªã‚Šã¾ã™ï¼Žã‚‚ã—ã‹ã—ãŸã‚‰ã‚¢ã‚»ãƒ³ãƒ–ãƒªè¨€èªžã®æœ¬å½“ã®å…¥é–€ã¨ã—ã¦ã¯ä¸é©åˆ‡ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒï¼Œã¾ã‚ã”äº†æ‰¿ãã ã•ã„ï¼Ž ãã‚Œã§ã¯ï¼Œæœ€åˆã«ä»–ã®è¨€èªžã¨åŒæ§˜ï¼Œ"Hello Xbyak!"ã‚’è¡¨ç¤ºã—ã¦ã¿ã¾ã—ã‚‡ã†ï¼Ž #include "xbyak/xbyak.h" #include <stdio.h> struct HelloGenerator : public Xbyak::CodeGenerator { // (A) HelloGenerator() // (B) { push((
kazuhooku 2007/09/29
x86

assembler
ãƒªãƒ³ã‚¯
Xbyakã§å§‹ã‚ã‚‹x86(IA-32)å…¥é–€ (mitsunari@cybozu labs)
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kazuhooku 2007/09/26
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x86

assembler
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x86 calling conventions - Wikipedia
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kazuhooku 2007/09/14
x86
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Frank's Technotes: 64-bit atomic operations.
kazuhooku 2007/09/14
ï¾Šï¾žï½³ï¾ï¾€ï¾žï¾˜æƒãˆã‚Œã°movqã§64bit atomic accessãŒå¯èƒ½

x86
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ä¸¦åˆ—ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ï¼ˆãã®ï¼’ï¼‰ : DSASé–‹ç™ºè€…ã®éƒ¨å±‹
3.Memory Ordering ã‚·ãƒ³ã‚°ãƒ«ãƒ—ãƒã‚»ãƒƒã‚µã®ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã§ã¯ã€volatileå¤‰æ•°ã‚’ãƒ•ãƒ©ã‚°ã«ã—ã¦ç°¡å˜ãªåŒæœŸã‚’æ›¸ãã“ã¨ãŒã§ãã¾ã—ãŸã€‚ ä¾‹ãˆã°ã€æ¬¡ã®ã‚ˆã†ãªæ„Ÿã˜ã§ã™ã€‚ï¼ˆã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã¯volatileå¤‰æ•°ã¸ã®ã‚¢ã‚¯ã‚»ã‚¹ã®é †åºã‚’å…¥ã‚Œæ›¿ãˆãªã„ã‚‚ã®ã¨ã—ã¾ã™ï¼‰ volatile int done = 0; volatile struct { int foo; int bar; } foobar; void writer(void) { foobar.foo = fizz(); foobar.bar = bazz(); done = 1; } void reader(void) { int foo, bar; while (!done) sleep(1); foo = foobar.foo; bar = foobar.bar; } ã“ã‚Œã¯ã€ãƒžãƒ«ãƒãƒ—ãƒã‚»ãƒƒã‚µç’°å¢ƒã§ã¯ä¸Šæ‰‹ãã„ã‹ãªã„ã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚ä»Šæ™‚
kazuhooku 2007/09/14
:::memory ã‚’ã¤ã‘ãªã„ã¨gccãŒãƒªã‚ªãƒ¼ãƒ€ãƒªãƒ³ã‚°ã™ã‚‹ã¨ã‹ã—ãªã„ã¨ã‹

x86
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