12.3.    437

 12.2.  
  -                   

EREW                            ,  
(Exclusive Read Exclusive Write)

CREW                           ,  
(Concurrent Read Exclusive Write)

ERCW                           ,  
(Exclusive Read Concurrent Write)

CRCW                           ,  
(Concurrent Read Concurrent Write)

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12.3.   

      class.  
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    . 12.1.

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