The "Double-Checked Locking is Broken" Declaration
The "Double-Checked Locking is Broken" Declaration Signed by: David Bacon (IBM Research) Joshua Bloch (Javasoft), Jeff Bogda, Cliff Click (Hotspot JVM project), Paul Haahr, Doug Lea, Tom May, Jan-Willem Maessen, Jeremy Manson, John D. Mitchell (jGuru) Kelvin Nilsen, Bill Pugh, Emin Gun Sirer Double-Checked Locking is widely cited and used as an efficient method for implementing lazy initialization
Posix共有メモリ - s-kita’s blog
Posix.1ã§ã¯ã€ç„¡é–¢ä¿‚ãªãƒ—ãƒã‚»ã‚¹é–“ã§ã®ãƒ¡ãƒ¢ãƒªå…±æœ‰ã‚’è¡Œã†æ–¹æ³•ã‚’２種類æä¾›ã—ã¦ã„る。 1.メモリマップファイル(memory-mapped files): ファイルをopenã—ã€çµæžœã®ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã‚’mmapã§ãƒ—ãƒã‚»ã‚¹ã®ã‚¢ãƒ‰ãƒ¬ã‚¹ç©ºé–“ã«ãƒžãƒƒãƒ—ã™ã‚‹ 共有メモリオブジェクト(shared memory objects): shm_openã§IPCåをオープンã—ã€è¿”ã•ã‚ŒãŸãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã‚’mmapã§ãƒ—ãƒã‚»ã‚¹ã®ã‚¢ãƒ‰ãƒ¬ã‚¹ç©ºé–“ã«ãƒžãƒƒãƒ—ã™ã‚‹ shm_open関数ã€shm_unlink関数Posix共有メモリã®ä½¿ç”¨ã«ã¯ã€ï¼’ステップã®å‡¦ç†ãŒå¿…è¦ã€‚ 1.åå‰å¼•æ•°ã‚’与ãˆã¦shm_openを呼ã³å‡ºã™ 2.mmapを呼ã³å‡ºã—ã€å…±æœ‰ãƒ¡ãƒ¢ãƒªã‚’呼ã³å‡ºã—ãŸãƒ—ãƒã‚»ã‚¹ã®ã‚¢ãƒ‰ãƒ¬ã‚¹ç©ºé–“ã«ãƒžãƒƒãƒ—ã™ã‚‹ shm_openã§ç”¨ã„ãŸåå‰å¼•æ•°ã¯ã€ã“ã®ãƒ¡ãƒ¢ãƒªã‚’ä»–ã®ãƒ—ãƒã‚»ã‚¹ã‹ã‚‰å…±æœ‰ã™ã‚‹å ´åˆã«ç”¨ã„ã‚‹åå‰ã«ãªã‚‹ã€‚ #include <sys/mm
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