usage: 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.
Note: MountShare should ONLY be used with respect to PURE handlers. 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. 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.
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.
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.