close Warning: Can't synchronize with repository "(default)" (Unsupported version control system "svn": /usr/lib/python2.7/dist-packages/libsvn/_fs.so: failed to map segment from shared object: Cannot allocate memory). Look in the Trac log for more information.

Changes between Version 3 and Version 4 of wade/linuxProgramming


Ignore:
Timestamp:
Jan 9, 2009, 5:33:42 PM (17 years ago)
Author:
wade
Comment:

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  • wade/linuxProgramming

    v3 v4  
    3737
    3838== Pipe ==
    39 read() 會被 block 住，所以不用擔心 parent 會比 child 先結束，而導致 child 也跟著結束 (因為 child process 是依附著 parent process 而存在，依存關係可透過 pstree 查詢)。
    40 
     39 * FD[0] 負責 read pipe。FD[1] 負責 write pipe。
     40 * read() 會被 block 住，所以不用擔心 parent 會比 child 先結束，而導致 child 也跟著結束 (因為 child process 是依附著 parent process 而存在，依存關係可透過 pstree 查詢)。
     41 * FD 也是分開，child 跟 parent 有各自的 FD[0]、FD[1]。
     42 
    4143== Reference ==
    4244 * [http://angkor.jazzbear.idv.tw/Linux_DivX/ Jazz 教學檔案]。