diff options
author | alc <alc@FreeBSD.org> | 2002-07-29 19:41:22 +0000 |
---|---|---|
committer | alc <alc@FreeBSD.org> | 2002-07-29 19:41:22 +0000 |
commit | 478c0ba990961936269a6d44bccdbf9891a19977 (patch) | |
tree | 8770c6b5954a800908c6c0f6611953827b07e706 | |
parent | deb56242100f6e090d1bc5c5e88885d2670f51d0 (diff) | |
download | FreeBSD-src-478c0ba990961936269a6d44bccdbf9891a19977.zip FreeBSD-src-478c0ba990961936269a6d44bccdbf9891a19977.tar.gz |
o Introduce vm_page_sleep_if_busy() as an eventual replacement for
vm_page_sleep_busy(). vm_page_sleep_if_busy() uses the page
queues lock.
-rw-r--r-- | sys/vm/vm_page.c | 22 | ||||
-rw-r--r-- | sys/vm/vm_page.h | 1 |
2 files changed, 23 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: * diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index 42b4410..bd44012 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -332,6 +332,7 @@ void vm_page_copy(vm_page_t src_m, vm_page_t dest_m); void vm_page_free(vm_page_t m); void vm_page_free_zero(vm_page_t m); int vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg); +int vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg); void vm_page_dirty(vm_page_t m); void vm_page_undirty(vm_page_t m); void vm_page_wakeup(vm_page_t m); |