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vm_page_io_start (9)

>> vm_page_io_start (9) ( FreeBSD man: Ядро )

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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

An -nosplit This manual page was written by An Chad David Aq [email protected] and An Alfred Perlstein Aq [email protected] .

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