2010-12-27Boostã«ä»¥å‰ã‹ã‚‰read-writeãƒãƒƒã‚¯ã¯å®Ÿè£…ã•ã‚Œã¦ã„ãŸã‚ˆã†ã§ã™ãŒãƒã‚°ãŒã‚ã£ãŸã¨ã‹ã§æœ€è¿‘ã®ç‰©ã§ã¯upgrade_lock, upgrade_to_unique_lockã«ã•ã—変ã‚ã£ã¦ã„ã¾ã™ã€‚ ãŸã ã®ãƒãƒƒã‚¯ã¨æ¯”ã¹ã¦ãƒ‘フォーマンスãŒå‡ºã‚„ã™ã„上ã«ç´ 性ã®è‰¯ã„è¨è¨ˆã ã¨æ€ã†ã®ã§ç´¹ä»‹ã—ã¦ã¿ã‚ˆã†ã¨æ€ã„ã¾ã™ã€‚ read lock read-lockã‚’ã™ã‚‹å ´åˆã¯shared_mutexを引数ã«shared_lockã‚’ã‹ã‘ã¦ã‚„ã‚Œã°ã„ã„ã§ã™ã€‚ #include <boost/thread.hpp> using namespace boost; shared_mutex mutex; void reader(){ shared_lock<shared_mutex> read_lock(mutex); // ã“ã“ã§ãƒãƒƒã‚¯ï¼ // クリティカルセクション } スコープを外れるã¨åŒæ™‚ã«shared_lockã®ãƒ‡ã‚¹ãƒˆ
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