diff options
| author | mtm <mtm@FreeBSD.org> | 2004-07-12 15:28:31 +0000 |
|---|---|---|
| committer | mtm <mtm@FreeBSD.org> | 2004-07-12 15:28:31 +0000 |
| commit | 8e8f80bd23b814fd62dfaa9cad441cee760e63d3 (patch) | |
| tree | 76b0aee1d4081a4c01a07590c3b321c577dff63d /sys/kern/kern_umtx.c | |
| parent | fae9d5166b05adb387f7ba91b99498b29b02792f (diff) | |
| download | FreeBSD-src-8e8f80bd23b814fd62dfaa9cad441cee760e63d3.zip FreeBSD-src-8e8f80bd23b814fd62dfaa9cad441cee760e63d3.tar.gz | |
writers must hold both sched_lock and the process lock; therefore, readers
need only obtain the process lock.
Diffstat (limited to 'sys/kern/kern_umtx.c')
| -rw-r--r-- | sys/kern/kern_umtx.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c index e1ae68d..1289cd7 100644 --- a/sys/kern/kern_umtx.c +++ b/sys/kern/kern_umtx.c @@ -217,14 +217,12 @@ _umtx_lock(struct thread *td, struct _umtx_lock_args *uap) * unlocking the umtx. */ PROC_LOCK(td->td_proc); - mtx_lock_spin(&sched_lock); - if (old == owner && (td->td_flags & TDF_UMTXWAKEUP) == 0) { - mtx_unlock_spin(&sched_lock); + if (old == owner && (td->td_flags & TDF_UMTXWAKEUP) == 0) error = msleep(td, &td->td_proc->p_mtx, td->td_priority | PCATCH, "umtx", 0); - mtx_lock_spin(&sched_lock); - } else + else error = 0; + mtx_lock_spin(&sched_lock); td->td_flags &= ~TDF_UMTXWAKEUP; mtx_unlock_spin(&sched_lock); PROC_UNLOCK(td->td_proc); |
