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VM_PAGE_IO_START(9)	 BSD Kernel Developer's	Manual	   VM_PAGE_IO_START(9)

NAME
     vm_page_io_start, vm_page_io_finish -- ready or unready a page for	I/O

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_io_start(vm_page_t	m);

     void
     vm_page_io_finish(vm_page_t m);

DESCRIPTION
     The vm_page_io_start() function prepares the page for I/O by incrementing
     its busy flag by one.

     The vm_page_io_finish() function lowers the busy count on the page	by
     one, if the resulting busy	count is zero, a wakeup(9) will	be issued if
     the page has been marked VPO_WANTED.  A page is typically marked
     VPO_WANTED	by a thread to register	its interest in	the page to either
     complete I/O or becoming available	for general use.

AUTHORS
     This manual page was written by Chad David	<davidc@acns.ab.ca> and	Alfred
     Perlstein <alfred@FreeBSD.org>.

BSD				 July 17, 2001				   BSD

NAME | SYNOPSIS | DESCRIPTION | AUTHORS

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