Club Amiga de Montreal - CAM/CAM_CD_1.iso/files/620.lha/mountshare/mountshare.man.pp/mountshare.man

Text File | 1992-03-03 | 5.4 KB | 199 lines

     MountShare(1l)        Amiga Programmer's Manual         MountShare(1l)



     ›1mUSAGE
          ›0musage: MountShare {{[+-][lchdf]} {<devicename>}}
           +l: load Handler/FileSystem file
           +c: create FileSysEntry
           -h: don't compare Handler/FileSystem filenames
           -d: don't compare DosType values
           +f: search FileSysEntries
          The option opposite to default is shown.

          The use  of MountShare is as follows.  Suppose you have some
          filesystem or other handler that you wish to mount  multiple
          times.   For  example,  you might have the following in your
          mountlist:

          PIP:  Handler = L:ConHandler
                StackSize = 600
                Priority = 5
                GlobVec = 0
          #
          CNC:  Handler = L:ConHandler
                StackSize = 600
                Priority = 5
                GlobVec = 0
          #

          If you mount and use both of PIP: and CNC:, the result  will
          be that  the  handler L:ConHandler is loaded twice.  This is
          clearly a waste of memory,  since  many  handlers  are  PURE
          code.

          ›4mNote›0m:  ›4mMountShare›0m  ›4mshould›0m  ›4mONLY›0m ›4mbe›0m ›4mused›0m ›4mwith›0m ›4mrespect›0m ›4mto›0m ›4mPURE›0m
          ›4mhandlers›0m.   Examples  of  pure  handlers  are:  L:ConHandler
          (ConMan),     L:FastFileSystem,     newer     versions    of
          MessyFileSystem (1.51  and  higher),  L:Port-Handler  (PRT:,
          SER: and PAR:).

          MountShare will allow you to re-use the loaded code from one
          device for   other  devices  that  are  applicable.    Using
          MountShare you specify a "master" device whose handler  will
          be re-used  by  other  devices.   (The word "device" in this
          document is used for an AmigaDOS device,  not  for  an  Exec
          .device.)

          This is done in the following way:

          - Optionally,  the  master  handler  is loaded if necessary.
          Otherwise sharing it would not have any effect.

          - Optionally,  the  handler  is  made   available   on   the
          FileSystem.resource list.    This  can  only  be done if the
          master has a proper DosType value.

          - If the other device specifies the same  filename  for  the
          handler, the master code is shared.  Otherwise,

          - if  the  other device has the same DosType value specified
          in the Mountlist information, the  master  code  is  shared.


     Rhialto, KosmoSoft               -1-


     MountShare(1l)        Amiga Programmer's Manual         MountShare(1l)


          Otherwise,

          - optionally,  if the other device has a DosType for which a
          FileSystem.resource  handler  is  available,  that  code  is
          shared.

          Another  application  of  MountShare  is  when  you  have  a
          harddisk with the FastFileSystem,  and  later  you  want  to
          mount more partitions (or floppies) using the FFS. Since all
          FFS devices are identified by the line

              DosType = 0x444F5301

          you  can  mount  all  these  devices, then use MountShare to
          share the FFS code between all of them.   If  your  harddisk
          does not automount you may want to specify the +l option.

     ›1mEXAMPLES
          ›0mThe  second  example  assumes  you  installed ConMan. ConMan
          changes the CON: device as if it had the same  mountlist  as
          given for PIP: and CNC: above.

          1> MountShare +l ser
          L:PORT-HANDLER loaded.
          SER and PRT share handler L:PORT-HANDLER: SegList copied.
          SER and PAR share handler L:PORT-HANDLER: SegList copied.

          1> Mount PIP: CNC:
          1> MountShare CON
          CON and CNC share handler L:ConHandler: SegList copied.
          CON and PIP share handler L:ConHandler: SegList copied.

     ›1mCAVEATS
          ›0m›4mMountShare›0m   ›4mshould›0m  ›4mONLY›0m  ›4mbe›0m  ›4mused›0m  ›4mwith›0m  ›4mrespect›0m  ›4mto›0m  ›4mPURE›0m
          ›4mhandlers›0m.

          Of course,  you  should  use  MountShare  before  using  the
          device,  because  otherwise  the  handler  will be loaded by
          AmigaDOS and there won't be much to share.

          Similarly, you should not have the line

              Mount = 1

          in your mountlist entry, since the Mount command  will  load
          the handler unconditionally in this case.

          If  you  decide to share a file system handler, or add it to
          the  FileSystem.resource,  the  handler  should   never   be
          unloaded again.    If  the handler has the ability to unload
          itself, this should not be used.

     ›1mFUTURE COMPATIBILITY
          ›0mEverything that MountShare does should be done  by  a  smart
          Mount command.      Perhaps  this  will  be  implemented  by
          Commodore in a future version.




     Rhialto, KosmoSoft               -2-


     MountShare(1l)        Amiga Programmer's Manual         MountShare(1l)


     ›1mBUGS
          ›0mOther  processes  should  not  change  the  device  list  or
          FileSystem.resource list while we are running.

     ›1mAUTHOR
          ›0mCopyright   1992   by   Olaf  ›3mRhialto  ›0mSeibert.  All  rights
          reserved.





















































     Rhialto, KosmoSoft               -3-