VM_PAGE_BUSY(9)

NAME

     vm_page_busy, vm_page_flash, vm_page_wakeup -- handle the busying and
     unbusying of a page

SYNOPSIS

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

     void
     vm_page_busy(vm_page_t m);

     void
     vm_page_flash(vm_page_t m);

     void
     vm_page_wakeup(vm_page_t m);

DESCRIPTION

     These functions handle the busying, unbusying and notification of the
     unbusying of a page.

     vm_page_busy() sets the PG_BUSY flag in the page.

     vm_page_flash() checks to see if there is anybody waiting on the page
     (PG_WANTED will be set), and if so, clears the PG_WANTED flag and noti-
     fies whoever is waiting via wakeup().

     vm_page_wakeup() clears the PG_BUSY flag on the page, and calls
     vm_page_flash() in case somebody has been waiting for it.

SEE ALSO

     vm_page_sleep_busy(9), wakeup(9)

AUTHORS

     This man page was written by Chad David <davidc@acns.ab.ca>.