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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
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static struct v4l2_i2c_driver_data v4l2_i2c_data = {
        .name = "ov7670",
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 1) cat /proc/version
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 3) uname -r
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 1) lsb_release -a
 2) cat /etc/redhat-release
 3) cat /etc/issue
 4) rpm -q redhat-release (redhatϵͳ) ......

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a) µçÔ´¹ÜÀí  Íê³ÉµçÔ´¹ÜÀí¹¤×÷ÐèÒª¶Ôϵͳ½á¹¹µÄÀí½â£¬ÇÒÓÐÑϸñµÄ˳Ðò£¬È磺һ¸öUSBËÞÖ÷ÊÊÅäÆ÷£¬ÔÚ´¦À ......

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http://www.svn8.com/linux/glpz/20100221/22543.html
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# uname -a
Linux euis1 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux
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# cat /etc/issue | grep Linux
Red Hat Enterprise Linux AS release 4 (Nahant Update 5)
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# cat /proc/cpuinfo | grep name | cut -f2 -d: ......
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