Sharing data between libraries

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  • Jon Kneller
    #1

    Sharing data between libraries

    I have 2 seperate libraries, compiled to .so files (these are being loaded
    into a Tcl process).

    I would like to be able to share data (a linked list) between these
    libraries - one needs to modify the data, the other needs to search it. I
    cannot be certain that both libraries will loaded at any given time.
    Because the program using the libraries is Tcl, I can't store the data at
    that level.

    Any ideas on how I can achieve this?

    Thanks,
    Jon


    Tags: None
    • Dan Pop
      #2
      Re: Sharing data between libraries

      In <cbrv3o$12c4$1@ sp15en20.hursle y.ibm.com> "Jon Kneller" <kneller@uk.ibm .com> writes:
      [color=blue]
      >I have 2 seperate libraries, compiled to .so files (these are being loaded
      >into a Tcl process).
      >
      >I would like to be able to share data (a linked list) between these
      >libraries - one needs to modify the data, the other needs to search it. I
      >cannot be certain that both libraries will loaded at any given time.
      >Because the program using the libraries is Tcl, I can't store the data at
      >that level.
      >
      >Any ideas on how I can achieve this?[/color]

      What was your C language question?

      Dan
      --
      Dan Pop
      DESY Zeuthen, RZ group
      Email: Dan.Pop@ifh.de

        Comment

        • kal
          #3
          Re: Sharing data between libraries

          "Jon Kneller" <kneller@uk.ibm .com> wrote in message news:<cbrv3o$12 c4$1@sp15en20.h ursley.ibm.com> ...
          [color=blue]
          > I have 2 seperate libraries, compiled to .so files (these are being loaded
          > into a Tcl process).[/color]

          <snip>
          [color=blue]
          > Any ideas on how I can achieve this?[/color]

          If "Tcl" is yet another language/environment then there
          probably are newsgroups for that. My $0.02 would be to
          get rid of one or both the libraries.

            Comment

            • Jon Kneller
              #4
              Re: Sharing data between libraries

              Thanks. I have tried comp.lang.tcl with no luck - merging the libraries is
              an option but a messy one (unfortunately most of the options available seem
              at least a little messy...)

              Jon

              "kal" <k_amir7@yahoo. com> wrote in message
              news:a5da4cc1.0 406291131.407a2 517@posting.goo gle.com...[color=blue]
              > "Jon Kneller" <kneller@uk.ibm .com> wrote in message[/color]
              news:<cbrv3o$12 c4$1@sp15en20.h ursley.ibm.com> ...[color=blue]
              >[color=green]
              > > I have 2 seperate libraries, compiled to .so files (these are being[/color][/color]
              loaded[color=blue][color=green]
              > > into a Tcl process).[/color]
              >
              > <snip>
              >[color=green]
              > > Any ideas on how I can achieve this?[/color]
              >
              > If "Tcl" is yet another language/environment then there
              > probably are newsgroups for that. My $0.02 would be to
              > get rid of one or both the libraries.[/color]


                Comment

                • Jon Kneller
                  #5
                  Re: Sharing data between libraries

                  Sorry, I have just read my post back and it was far from clear.

                  The question was, can I share data between 2 shared libraries in C, when
                  these libraries are loaded into a C program which cannot change? Is it
                  possible to call functions in one from the other? Is it possible to
                  reference data in one from the other? Is there another way to have the
                  libraries share data that I haven't seen?

                  I am investigating shared memory at the moment but am unsure if there is a
                  better approach.

                  Jon

                  "Dan Pop" <Dan.Pop@cern.c h> wrote in message
                  news:cbs15i$nmk $1@sunnews.cern .ch...[color=blue]
                  > In <cbrv3o$12c4$1@ sp15en20.hursle y.ibm.com> "Jon Kneller"[/color]
                  <kneller@uk.ibm .com> writes:[color=blue]
                  >[color=green]
                  > >I have 2 seperate libraries, compiled to .so files (these are being[/color][/color]
                  loaded[color=blue][color=green]
                  > >into a Tcl process).
                  > >
                  > >I would like to be able to share data (a linked list) between these
                  > >libraries - one needs to modify the data, the other needs to search it.[/color][/color]
                  I[color=blue][color=green]
                  > >cannot be certain that both libraries will loaded at any given time.
                  > >Because the program using the libraries is Tcl, I can't store the data at
                  > >that level.
                  > >
                  > >Any ideas on how I can achieve this?[/color]
                  >
                  > What was your C language question?
                  >
                  > Dan
                  > --
                  > Dan Pop
                  > DESY Zeuthen, RZ group
                  > Email: Dan.Pop@ifh.de[/color]


                    Comment

                    • Dan Pop
                      #6
                      Re: Sharing data between libraries

                      In <cbu1lk$1f7a$1@ sp15en20.hursle y.ibm.com> "Jon Kneller" <kneller@uk.ibm .com> writes:
                      [color=blue]
                      >Sorry, I have just read my post back and it was far from clear.
                      >
                      >The question was, can I share data between 2 shared libraries in C, when
                      >these libraries are loaded into a C program which cannot change? Is it
                      >possible to call functions in one from the other? Is it possible to
                      >reference data in one from the other? Is there another way to have the
                      >libraries share data that I haven't seen?[/color]

                      There is nothing library specific in your questions. Once your C
                      libraries are becoming part of your program, everything should work as
                      normal (a global variable defined in one library and declared in the
                      other is transparently shared between the two libraries). Think about
                      things like stdin and stdout, usually defined in one shared library.
                      Ditto about calling fprintf from another library.

                      Dan
                      --
                      Dan Pop
                      DESY Zeuthen, RZ group
                      Email: Dan.Pop@ifh.de

                        Comment

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