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C Copyright (c) 2003-2010 University of Florida
C
C This program is free software; you can redistribute it and/or modify
C it under the terms of the GNU General Public License as published by
C the Free Software Foundation; either version 2 of the License, or
C (at your option) any later version.
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C The GNU General Public License is included in this distribution
C in the file COPYRIGHT.
subroutine make_free_block(node, server_table, nserver_table)
c-----------------------------------------------------------------------------
c Produces a free block, doing a backup of a dirty block to disk if
c necessary. If successful, the node's "c_msg_state" field is set to
c "null_state", and the "c_msg_memptr" field points to the block.
c-----------------------------------------------------------------------------
implicit none
include 'server.h'
include 'server_stat.h'
include 'dbugcom.h'
integer nserver_table, node
integer server_table(lserver_table_entry,nserver_table)
integer iblock
c---------------------------------------------------------------------------
c First, see if a clean block is already available.
c---------------------------------------------------------------------------
call find_clean_block(iblock, server_table, nserver_table)
if (iblock .le. 0) then
c----------------------------------------------------------------------------
c All clean blocks are busy. We must find a dirty block and back it up
c to disk.
c---------------------------------------------------------------------------
call do_backup(iblock, server_table, nserver_table)
endif
if (iblock .gt. 0) then
server_msg(c_msg_state,node) = null_state
server_msg(c_msg_memptr,node) = iblock
endif
return
end
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