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1. AIOÕû¸ö¹ý³ÌËùʹÓõÄÊý¾Ý´æ·ÅÔÚÒ»¸ö½á¹¹ÌåÖУ¬struct aiocb,aio control block.¿´¿´Í·ÎļþÖеĶ¨Ò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
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