diff options
Diffstat (limited to 'sys/vm/vm_page.c')
-rw-r--r-- | sys/vm/vm_page.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index 1674b07..9acd481 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -552,6 +552,28 @@ vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg) } return (FALSE); } + +/* + * vm_page_sleep_if_busy: + * + * Sleep and release the page queues lock if PG_BUSY is set or, + * if also_m_busy is TRUE, busy is non-zero. Returns TRUE if the + * thread slept and the page queues lock was released. + * Otherwise, retains the page queues lock and returns FALSE. + */ +int +vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg) +{ + + mtx_assert(&vm_page_queue_mtx, MA_OWNED); + if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) { + vm_page_flag_set(m, PG_WANTED | PG_REFERENCED); + msleep(m, &vm_page_queue_mtx, PDROP | PVM, msg, 0); + return (TRUE); + } + return (FALSE); +} + /* * vm_page_dirty: * |