From d0bc12ce2fb989b7834dbf26d5bf51c47ec4a727 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Sun, 12 Oct 2014 15:32:54 +0200
Subject: [PATCH hurd 25/29] maybe_fu use pp

---
 libports/complete-deallocate.c |  9 +++------
 libports/destroy-right.c       | 32 ++++++++++++--------------------
 2 files changed, 15 insertions(+), 26 deletions(-)

diff --git a/libports/complete-deallocate.c b/libports/complete-deallocate.c
index 1a6eb54..6799dfd 100644
--- a/libports/complete-deallocate.c
+++ b/libports/complete-deallocate.c
@@ -27,7 +27,7 @@ _ports_complete_deallocate (struct port_info *pi)
 {
   assert ((pi->flags & PORT_HAS_SENDRIGHTS) == 0);
 
-  if (pi->port_right)
+  if (MACH_PORT_VALID (pi->port_right))
     {
       struct references result;
 
@@ -45,11 +45,8 @@ _ports_complete_deallocate (struct port_info *pi)
       hurd_ihash_locp_remove (&pi->bucket->htable, pi->hentry);
       pthread_rwlock_unlock (&_ports_htable_lock);
 
-      /* If the right has been destroyed using ports_destroy_right,
-	 port_right is set to MACH_PORT_DEAD.  */
-      if (MACH_PORT_VALID (pi->port_right))
-	mach_port_mod_refs (mach_task_self (), pi->port_right,
-			    MACH_PORT_RIGHT_RECEIVE, -1);
+      mach_port_mod_refs (mach_task_self (), pi->port_right,
+			  MACH_PORT_RIGHT_RECEIVE, -1);
       pi->port_right = MACH_PORT_NULL;
     }
 
diff --git a/libports/destroy-right.c b/libports/destroy-right.c
index 1e32379..ed6b66b 100644
--- a/libports/destroy-right.c
+++ b/libports/destroy-right.c
@@ -36,22 +36,21 @@ ports_destroy_right (void *portstruct)
   struct port_info *pi = portstruct;
   error_t err;
 
+  mach_port_clear_protected_payload (mach_task_self (),
+				     pi->port_right);
+
   pthread_mutex_lock (&_ports_lock);
   if (pi->port_right != MACH_PORT_NULL)
     {
-      mach_port_clear_protected_payload (mach_task_self (),
-					 pi->port_right);
-
       pthread_rwlock_wrlock (&_ports_htable_lock);
       hurd_ihash_locp_remove (&_ports_htable, pi->ports_htable_entry);
       hurd_ihash_locp_remove (&pi->bucket->htable, pi->hentry);
       pthread_rwlock_unlock (&_ports_htable_lock);
+
       err = mach_port_mod_refs (mach_task_self (), pi->port_right,
 				MACH_PORT_RIGHT_RECEIVE, -1);
       assert_perror (err);
 
-      pi->port_right = MACH_PORT_NULL;
-
       if (pi->flags & PORT_HAS_SENDRIGHTS)
 	{
 	  /* There are outstanding send rights, so we might get a
@@ -67,8 +66,6 @@ ports_destroy_right (void *portstruct)
 	     reference here, but defer that instead.  */
 	  defer_dereferencing (pi);
 	}
-      else
-	hurd_ihash_locp_remove (&pi->bucket->htable, pi->hentry);
 
       pi->port_right = MACH_PORT_DEAD;
     }
@@ -117,20 +114,17 @@ gc_loop (void *arg)
       while (d != NULL)
 	{
 	  struct deferred_dereference *next = d->next;
-	  int references;
+	  struct references refs;
 
-	  pthread_mutex_lock (&_ports_lock);
-	  references = d->pi->refcnt;
-	  pthread_mutex_unlock (&_ports_lock);
+	  refcounts_references (&d->pi->refcounts, &refs);
 
-	  assert (references <= 2 || !"reference to destroyed right leaked");
+	  // XXX: Need to think more about this.
+	  assert (refs.hard <= 2 || !"reference to destroyed right leaked");
 
-	  if (references == 2)
+	  if (refs.hard == 2)
 	    {
+	      /* XXX: does this actually happen? if so, why?? */
 	      /* Get rid of the hash table reference.  */
-	      pthread_mutex_lock (&_ports_lock);
-	      hurd_ihash_locp_remove (&d->pi->bucket->htable, d->pi->hentry);
-	      pthread_mutex_unlock (&_ports_lock);
 	      ports_port_deref (d->pi);
 	    }
 
@@ -177,15 +171,13 @@ defer_dereferencing (struct port_info *pi)
 
   pthread_once (&once, start_gc);
 
-  /* XXX we hold _ports_lock, so we cannot do
-     ports_port_ref (pi); */
-  pi->refcnt += 1;
+  ports_port_ref (pi);
   d->pi = pi;
 
+ retry:
   /* Append to the current generation.	*/
   g = __atomic_load_n (&generation, __ATOMIC_RELAXED);
 
- retry:
   d->next = __atomic_load_n (&generations[g], __ATOMIC_RELAXED);
   if (! __atomic_compare_exchange_n (&generations[g], &d->next, d,
 				     0, __ATOMIC_RELAXED, __ATOMIC_RELAXED))
-- 
2.1.3