VM_PAGE_IO_START(9) MidnightBSD 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 PG_WANTED. A page is typically marked PG_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〉.

MidnightBSD 0.3 July 17, 2001 MidnightBSD 0.3