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4. Ò첽ʱ¼ä·Ç×èÈûI/O: Ò²½Ð×öÒì²½I/O(AIO)£¬Óû§³ÌÐò¿ÉÒÔͨ¹ýÏòÄں˷¢³öI/OÇëÇóÃüÁ²»ÓõȴøI/OʼþÕæÕý·¢Éú£¬¿ÉÒÔ¼ÌÐø×ö
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1. AIOÕû¸ö¹ý³ÌËùʹÓõÄÊý¾Ý´æ·ÅÔÚÒ»¸ö½á¹¹ÌåÖУ¬struct aiocb,aio control block.¿´¿´Í·ÎļþÖе͍Ò壺
/* Asynchronous I/O control block.  */
struct aiocb
{
  int aio_fildes;               /* File desriptor.  */ ÐèÒªÔÚÄĸöÎļþÃèÊö·ûÉϽøÐÐI/O
  int aio_lio_opcode;           /* Operation to be performed.  */ Õâ¸öÊÇÕë¶ÔÅúÁ¿I/OµÄÇé¿öÓÐЧ£¬¶Áд²Ù×÷ÀàÐÍ
  int aio_reqprio;              /* Request priority offset.  */ ÇëÇóÓÅÏȼ¶£¨If  _POSIX_PRIORITIZED_IO  is defined, and this file supports it, then the
                                       asynchronous operation is submitted at a priority equal to that of the
                       &n


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