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what's the difference between singal and semphore ?

Ferdinand
Intellectual 450 points

hi,all:

I am a freshman. I cannot distinguish the difference between singnal and semphore?

I think the two terms are a little similar.

who can explain that ? You'd better take a example. thanks!

  • 0
    TI__Mastermind 26780 points

    Ferdinand,

    There is a description of Semaphores and a usage example in Chapter 4 of the SYS/BIOS User’s Guide (Bios_User_Guide.pdf, in the “docs” subdirectory of your installation, for example: c:\ti\bios_6_37_02_27\docs).

    You can also find a good general overview of semaphores in this Wikipedia article: http://en.wikipedia.org/wiki/Semaphore_(programming)

    Scott

  • 0 in reply to ScottG
    Intellectual 450 points

    hi，Scott Gray:

    I don't understand why somebody from TI move my post from linux to RTOS forum.

    Gray,I know semphore and I also can use semphore well. My question is I don't know the

    difference between singnal and semphore which come from linux .

    Can someone move this subject into linux forum again? I don't think it's a good place where

    we talk the difference semphore and signal.  Because signal is linux terminology not DSPBIOS terminology.

    thanks!

  • 0 in reply to Ferdinand
    TI__Mastermind 18320 points

    Ferdinand,

    I went ahead and moved this post back to the Linux forum.  However, I would advise you to post your general questions about Linux on a more generic Linux forum site, as you're sure to get a better response there.  The TI forums tend to be best at answering questions that are more specific to TI's products.

  • 0 in reply to Ferdinand
    TI__Guru** 116100 points

    Hi Ferdinand,

    The both terms used for different purpose.

    Signal,

    It is async notification to the process or threads.

    In other way, The communication between user space and kernel is given by the system calls. But there is a different channel, that of the signals, used both between user processes and from kernel to user process.

    Ex:

    When you press [ctrl+c] in linux then SIGINT interrupt get generated that is called signal.

    In case of semaphore,

    It is locking mechanism when we do multiple thread programming.