multiple processes

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  • Vikas Vijay
    #1

    multiple processes

    hello all,
    I have a c++ code in which is sth like

    while(i < N)
    {
    ....
    do some processing in c++ to create file abc
    system("simulat or_name < abc")
    ......c++ ... processing..... .
    }
    The problem is my simulator takes some time T to load and only then
    starts working on the file abc.After completion the simulator is
    exited and the same thing(loading + execution happens in next
    iterations..) Since the number of iterations are huge (wasted time NT)
    i want something like :

    open the simulator only once( just doing system("simulat or_name") and
    get the handle to the simulator prompt. From then on i just load the
    new "abc" file in each iteration, wait for the simulation to complete
    (do not exit the simulator) and start my new iteration.

    I read about creating a new child process(popen command) etc but could
    not figure out exactly how to get a handle to the prompt, and wait
    till the simulation is completed. Also the child process is not to be
    killed otherwise i lose the handle.
    I would appreciate any help/references in this regard. There is
    nothing simulator specific. You can imagine a simple gdb command in
    place of simulator_comma nd and handle at gdb>

    -Thanks
    Vikas
    Tags: None
    • John Carson
      #2
      Re: multiple processes

      "Vikas Vijay" <vijayv@ececs.u c.edu> wrote in message
      news:ce59d7c6.0 307191947.e215d 9b@posting.goog le.com[color=blue]
      > hello all,
      > I have a c++ code in which is sth like
      >
      > while(i < N)
      > {
      > ...
      > do some processing in c++ to create file abc
      > system("simulat or_name < abc")
      > .....c++ ... processing..... .
      > }
      > The problem is my simulator takes some time T to load and only then
      > starts working on the file abc.After completion the simulator is
      > exited and the same thing(loading + execution happens in next
      > iterations..) Since the number of iterations are huge (wasted time NT)
      > i want something like :
      >
      > open the simulator only once( just doing system("simulat or_name") and
      > get the handle to the simulator prompt. From then on i just load the
      > new "abc" file in each iteration, wait for the simulation to complete
      > (do not exit the simulator) and start my new iteration.
      >
      > I read about creating a new child process(popen command) etc but could
      > not figure out exactly how to get a handle to the prompt, and wait
      > till the simulation is completed. Also the child process is not to be
      > killed otherwise i lose the handle.
      > I would appreciate any help/references in this regard. There is
      > nothing simulator specific. You can imagine a simple gdb command in
      > place of simulator_comma nd and handle at gdb>
      >
      > -Thanks
      > Vikas[/color]


      This is operating system specific (the boost threads library may allow you
      to make this somewhat platform independent, but I doubt that it will do the
      complete job). I suggest that you post to a newsgroup for your operating
      system.

      Alternatively, it might be simpler to integrate your while() loop into your
      simulator (perhaps your simulator could retrieve data from a file giving
      instructions for each run).


      --
      John Carson
      1. To reply to email address, remove donald
      2. Don't reply to email address (post here instead)

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