libports: lock-less reference counting for port_info objects

* libports/ports.h (struct port_info): Use the new type.
* libports/lookup-port.c: No need to lock _ports_lock anymore.
* libports/bucket-iterate.c: Likewise.
* libports/complete-deallocate.c: Check if someone reacquired a
reference through a hash table lookup.
* libports/create-internal.c: Use the new reference counting primitives.
* libports/get-right.c: Likewise.
* libports/import-port.c: Likewise.
* libports/port-deref-weak.c: Likewise.
* libports/port-deref.c: Likewise.
* libports/port-ref-weak.c: Likewise.
* libports/port-ref.c: Likewise.
* libports/reallocate-from-external.c: Likewise.
* libports/transfer-right.c: Likewise.
* utils/rpctrace.c: Likewise.

1 files changed, 3 insertions, 7 deletions

diff --git a/libports/port-deref-weak.c b/libports/port-deref-weak.c
index beb48423..8432660c 100644
--- a/libports/port-deref-weak.c
+++ b/libports/port-deref-weak.c
@@ -25,12 +25,8 @@ void
 ports_port_deref_weak (void *portstruct)
 {
   struct port_info *pi = portstruct;
-  
-  pthread_mutex_lock (&_ports_lock);
-  assert (pi->weakrefcnt);
-  pi->weakrefcnt--;
-  if (pi->refcnt == 0 && pi->weakrefcnt == 0)
+  struct references result;
+  refcounts_deref_weak (&pi->refcounts, &result);
+  if (result.hard == 0 && result.weak == 0)
     _ports_complete_deallocate (pi);
-  else
-    pthread_mutex_unlock (&_ports_lock);
 }