replacing shmem

Excuse my ignorance.
Is there a way to replace the shmem and sem (ipc.c) to use files. In this 
way we can have a sort of a parallel server using GFS.
1.Starting a postmaster on ONE machine creates the shared structures, 2.then 
start on other cluster-machines, the variuos machines share the same 
datafiles and shared memory (on-file) structures
3.cliets connects (for example) round-robin to the clustered-postgres-nodes.
4.a problem is proper destroy and create of the shared structures

thanks,
valter


From http://sistina.com/gfs/:

he Global File System (GFS [now in beta4]) is a shared disk cluster file 
system for Linux. GFS supports journaling and recovery from client failures. 
GFS cluster                                     nodes physically share the same 
storage by means of Fibre Channel or shared SCSI devices. The file system 
appears to be local on each node and GFS                                     synchronizes file access across the 
cluster. GFS is fully symmetric, that is, all nodes are equal and there is 
no server which may be a bottleneck or                                     single point of failure. GFS uses read 
and write caching while maintaining full UNIX file system semantics.

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