Aloha RubyConf 2012 - JRuby
JRuby is a Ruby implementation that runs on the Java Virtual Machine (JVM). It allows Ruby code to leverage Java libraries and frameworks and enables deployment on JVM platforms like Android. The JRuby team maintains and improves JRuby, but much of the underlying infrastructure like memory management, threading, and JIT compilation is provided by the JVM, allowing the team to focus on Ruby-specifi
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Twitterã‹ã‚‰è»¢è¼‰ ãµã¨ã‚¹ãƒ¬ãƒƒãƒ‰ã£ã¦ã„ã¤ç™ºæ˜Žã•ã‚ŒãŸã‚“ã ã‚ã†ã¨èª¿ã¹ã¦ã¿ãŸã‘ã©ã‚ˆãã‚ã‹ã‚‰ãªã„。LinuxãŒã‚«ãƒ¼ãƒãƒ«ã‚¹ãƒ¬ãƒƒãƒ‰ã‚’サãƒãƒ¼ãƒˆã—ãŸã®ãŒ2.6ã‹ã‚‰ã§2003å¹´ã¨ã‹æ„外ã¨æ–°ã—ã„？？もã¡ã‚んユーザレベルã®ã‚¹ãƒ¬ãƒƒãƒ‰ã¯ã‚‚ã£ã¨å¤ã„ã‚“ã ã‚ã†ã‘ã©ã€ã„ã¤ã‹ã‚‰ã ã‚ã†ã€‚ hideaki_t: NeXTSTEP(Mach 2.0?)ã«ã¯cthreadãŒã‚ã‚Šã¾ã—ãŸã€‚ atsuoishimoto: ç§ãŒã‚¹ãƒ¬ãƒƒãƒ‰ã£ã¦ç”¨èªžåˆã‚ã¦èžã„ãŸã®ã¯ã€ãŸã—ã‹'90年代åˆé ã®OS/2ã ã£ãŸã‹ãªã？ ã“ã‚ŒãŒ2004å¹´ã®è©±ã‹ï¼žNetBSD 2.x+, and DragonFly BSD implement LWPs as kernel threads (1:1 model) shidocchi: ç§ã¯é™¢ã®ç ”究室ã§Machã®ã‚½ãƒ¼ã‚¹ãƒªãƒ¼ãƒ‡ã‚£ãƒ³ã‚°ã‚’ã‚„ã£ã¦ãŸé ƒçŸ¥ã£ãŸã€‚ ã“ã‚ŒãŒ2001å¹´ ＞ October 2, 2001 Mac OS X
C++0xã®ãƒ¡ãƒ¢ãƒªãƒãƒªã‚¢ã‚’より深ã解説ã—ã¦ã¿ã‚‹ - yamasaã®ãƒã‚¿å¸³
ã‚‚ã¯ã‚„誰得レベルã«ãªã‚Šã¤ã¤ã‚ã‚Šã¾ã™ãŒã€ä»Šå›žã‚‚メモリãƒãƒªã‚¢ã«ã¤ã„ã¦ã®è©±ã§ã™ã€‚以å‰ã®è©±ã®ç¶šãã«ãªã‚‹ã®ã§ã€ã¾ã ã®æ–¹ã¯åˆå›žã¨å‰å›žã®ã‚¨ãƒ³ãƒˆãƒªã‚’å…ˆã«ã©ã†ãžã€‚ ã•ã¦ã€ã¾ãšæœ€åˆã«ã€C++0xã®atomicクラスを使ã£ãŸã€Œæ£ã—ãåŒæœŸåŒ–ã•ã‚Œã¦ã„るコードã€ã®ä¾‹ã‚’挙ã’ã¦ã¿ã¾ã™ã€‚ struct Hoge { int foo; }; // åˆæœŸå€¤ std::atomic p(nullptr); // Thread 1 Hoge* r1 = new Hoge(); r1->foo = 42; p.store(r1, std::memory_order_release); // Thread 2 Hoge* r2; do { r2 = p.load(std::memory_order_acquire); } while (r2 == nullptr); std::cout << r2->foo; // 42ãŒå‡ºåŠ›ã•ã‚Œã‚‹ã“
次期C++ã«å°Žå…¥ã•ã‚Œã‚‹ãƒ¡ãƒ¢ãƒªãƒãƒªã‚¢ã«ã¤ã„ã¦è§£èª¬ã—ã¦ã¿ã‚‹ - yamasaã®ãƒã‚¿å¸³
å‰ã®ã‚¨ãƒ³ãƒˆãƒªã§æ¬¡æœŸC++標準(通称C++0x)ã«atomicåž‹ã¨ãƒ¡ãƒ¢ãƒªãƒãƒªã‚¢ãŒå°Žå…¥ã•ã‚Œã‚‹ã¨ã„ã†è©±ã‚’ã—ã¾ã—ãŸã€‚今回ã¯ãã®C++ã§ã®å®Ÿè£…ã«ã¤ã„ã¦ã€ã‚‚ã†å°‘ã—æ·±ã追ã„ã‹ã‘ã¦ã¿ã¾ã™ã€‚ スライド資料ã§ã¯ã€Œatomicæ“作 ＋ acquire/releaseãƒãƒªã‚¢ã€ãŒåŸºæœ¬ã§ã‚ã‚‹ã¨æ›¸ãã¾ã—ãŸãŒã€å®Ÿéš›ã«æ¬¡æœŸC++ã«å°Žå…¥ã•ã‚Œã‚‹äºˆå®šã®atomic APIã¯ã€ã‚‚ã†å°‘ã—複雑ãªä»•æ§˜ã«ãªã£ã¦ã„ã¾ã™ã€‚一番ã®é•ã„ã¯ã€ãƒ¡ãƒ¢ãƒªãƒãƒªã‚¢ã®ç¨®é¡žãŒå¢—ãˆã¦ã„ã‚‹ã“ã¨ã§ã™ã€‚ 次期C++標準ã®ç¾åœ¨ã®ãƒ‰ãƒ©ãƒ•ãƒˆã§ã¯ã€ãƒ¡ãƒ¢ãƒªãƒãƒªã‚¢ã®ç¨®é¡žã‚’表ã™enumåž‹ã®å®šç¾©ã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ãªã£ã¦ã„ã¾ã™ã€‚ namespace std { typedef enum memory_order { memory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, m
C++0x時代㮠Double-Checked Locking - yamasaã®ãƒã‚¿å¸³
今回㯠"Double-Checked Locking" (以下DCL)ã¨ã„ã†ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ãƒ—ãƒã‚°ãƒ©ãƒ å‘ã‘ã®ã‚¤ãƒ‡ã‚£ã‚ªãƒ を例ã«ã—ã¦ã€C++0xã®(低レイヤå‘ã‘)マルãƒã‚¹ãƒ¬ãƒƒãƒ‰æ©Ÿèƒ½ã®åˆ©ç”¨æ–¹æ³•ã‚’紹介ã—ã¦ã¿ã¾ã™ã€‚ DCLã¨ã¯ã€ã€Œãƒãƒƒã‚¯â†’æ¡ä»¶åˆ¤å®šã€ã¨ã„ã†ãƒã‚¸ãƒƒã‚¯ã‚’「æ¡ä»¶åˆ¤å®šâ†’ãƒãƒƒã‚¯â†’(å†åº¦)æ¡ä»¶åˆ¤å®šã€ã¨æ›¸ãæ›ãˆã‚‹ã‚¤ãƒ‡ã‚£ã‚ªãƒ ã§ã€ä¸»ã«é…延åˆæœŸåŒ–ãªã©ã®å‡¦ç†ã«ãŠã„ã¦ãƒãƒƒã‚¯ã®ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰ã‚’減らã™ãŸã‚ã«ç”¨ã„られã¾ã™ã€‚DCLã¯ã‚·ãƒ³ãƒ—ルã‹ã¤åŠ¹æžœã®é«˜ã„イディオムã ã£ãŸã®ã§ã€ä¸€æ™‚期もã¦ã¯ã‚„ã•ã‚Œã¾ã—ãŸã€‚ã¨ã“ã‚ãŒã€DCLã¯ã‚³ãƒ³ãƒ‘イラやCPUã«ã‚ˆã‚‹ãƒªã‚ªãƒ¼ãƒ€ãƒ¼ã®å½±éŸ¿ã«ã‚ˆã‚Šæ£ã—ã動作ã—ãªã„å ´åˆãŒã‚ã‚‹ã“ã¨ãŒã‚ã‹ã£ãŸãŸã‚(å‚考1ã€å‚考2)ã€ä»Šã§ã¯ã‚¢ãƒ³ãƒãƒ‘ターンã¨å‘¼ã°ã‚Œã‚‹ã“ã¨ã™ã‚‰ã‚る始末ã§ã™ã€‚ ã—ã‹ã—ã€DCLã®å•é¡Œç‚¹ã¯ã€ãƒ¡ãƒ¢ãƒªãƒ¢ãƒ‡ãƒ«ã«é–¢ã™ã‚‹çŸ¥è˜ãŒã‚ã¾ã‚ŠçŸ¥ã‚‰ã‚Œã¦ã„ãªã‹ã£ãŸã“ã¨ã¨ã€ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã®ä»•æ§˜ã§ãƒ¡ãƒ¢ãƒªãƒ¢ãƒ‡ãƒ«ãŒæ£ã—ã定義ã•ã‚Œã¦
Threads (in Ruby): Enough Already
For a while now, the Ruby community has become enamored in the latest new hotness, evented programming and Node.js. It's gone so far that I've heard a number of prominent Rubyists saying that JavaScript and Node.js are the only sane way to handle a number of concurrent users. I should start by saying that I personally love writing evented JavaScript in the browser, and have been giving talks (for
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