From d3f649ba551ed42b319f11d3207dd5ad1703ca0c Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Sat, 18 Nov 1995 14:54:01 +0000
Subject: If calling thread is serving an RPC, don't block waiting for that RPC
 to finish.

---
 libports/inhibit-all-rpcs.c   |  6 ++++--
 libports/inhibit-class-rpcs.c | 17 ++++++++++-------
 libports/inhibit-port-rpcs.c  | 18 +++++++++++-------
 3 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/libports/inhibit-all-rpcs.c b/libports/inhibit-all-rpcs.c
index ebddbddd..55076486 100644
--- a/libports/inhibit-all-rpcs.c
+++ b/libports/inhibit-all-rpcs.c
@@ -27,13 +27,15 @@ void
 ports_inhibit_all_rpcs ()
 {
   struct port_bucket *bucket;
+  int this_one = 0;
   error_t interruptor (void *portstruct)
     {
       struct port_info *pi = portstruct;
       struct rpc_info *rpc;
 
       for (rpc = pi->current_rpcs; rpc; rpc = rpc->next)
-	hurd_thread_cancel (rpc->thread);
+	if (hurd_thread_cancel (rpc->thread) == EINTR)
+	  this_one = 1;
       return 0;
     }
 
@@ -42,7 +44,7 @@ ports_inhibit_all_rpcs ()
   for (bucket = _ports_all_buckets; bucket; bucket = bucket->next)
     ihash_iterate (bucket->htable, interruptor);
 
-  while (_ports_total_rpcs)
+  while (_ports_total_rpcs > this_one)
     {
       _ports_flags |= _PORTS_INHIBIT_WAIT;
       condition_wait (&_ports_block, &_ports_lock);
diff --git a/libports/inhibit-class-rpcs.c b/libports/inhibit-class-rpcs.c
index 033d0b11..5b5a602b 100644
--- a/libports/inhibit-class-rpcs.c
+++ b/libports/inhibit-class-rpcs.c
@@ -1,4 +1,4 @@
-/* 
+/*
    Copyright (C) 1995 Free Software Foundation, Inc.
    Written by Michael I. Bushnell.
 
@@ -27,23 +27,26 @@ ports_inhibit_class_rpcs (struct port_class *class)
 {
   struct port_info *pi;
   struct rpc_info *rpc;
-  
+  int this_one;
+
   mutex_lock (&_ports_lock);
-  
+
+  this_one = 0;
   for (pi = class->ports; pi; pi = pi->next)
     for (rpc = pi->current_rpcs; rpc; rpc = rpc->next)
-      hurd_thread_cancel (rpc->thread);
+      if (hurd_thread_cancel (rpc->thread) == EINTR)
+	this_one = 1;
 
-  while (class->rpcs)
+  while (class->rpcs > this_one)
     {
       class->flags |= PORT_CLASS_INHIBIT_WAIT;
       condition_wait (&_ports_block, &_ports_lock);
     }
-  
+
   class->flags |= PORT_CLASS_INHIBITED;
   class->flags &= ~PORT_CLASS_INHIBIT_WAIT;
 
   mutex_unlock (&_ports_lock);
 }
 
-			 
+
diff --git a/libports/inhibit-port-rpcs.c b/libports/inhibit-port-rpcs.c
index 718a8b3e..f4ddf497 100644
--- a/libports/inhibit-port-rpcs.c
+++ b/libports/inhibit-port-rpcs.c
@@ -1,4 +1,4 @@
-/* 
+/*
    Copyright (C) 1995 Free Software Foundation, Inc.
    Written by Michael I. Bushnell.
 
@@ -26,19 +26,23 @@ void
 ports_inhibit_port_rpcs (void *portstruct)
 {
   struct port_info *pi = portstruct;
-  struct rpc_info *rpc;
-  
+  struct rpc_info *rpc, *this_rpc;
+
   mutex_lock (&_ports_lock);
 
+  this_rpc = 0;
   for (rpc = pi->current_rpcs; rpc; rpc = rpc->next)
-    hurd_thread_cancel (rpc->thread);
-  
-  while (pi->current_rpcs)
+    if (hurd_thread_cancel (rpc->thread) == EINTR)
+      this_rpc = rpc;
+
+  while (pi->current_rpcs
+	 /* If this thread's RPC is the only one left, that doesn't count.  */
+	 && !(pi->current_rpcs == this_rpc && ! this_rpc->next))
     {
       pi->flags |= PORT_INHIBIT_WAIT;
       condition_wait (&_ports_block, &_ports_lock);
     }
-  
+
   pi->flags |= PORT_INHIBITED;
   pi->flags &= ~PORT_INHIBIT_WAIT;
 
-- 
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