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
