From 6b26fd1f09be1e50c7c17d6fcc8f61f1c1a4ba37 Mon Sep 17 00:00:00 2001
From: "Damien F. Katz" <damien@apache.org>
Date: Wed, 28 Apr 2010 16:54:26 +0000
Subject: Fix to make dbclose synchronous, to prevent unnecessary slowdown
 caused by many already completed client requests having a single db open, and
 the vm waiting a long time to asynchronously process the close messages.

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@939009 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couchdb/couch_ref_counter.erl | 41 +++++++++++++++++++++------------------
 1 file changed, 22 insertions(+), 19 deletions(-)

(limited to 'src/couchdb/couch_ref_counter.erl')

diff --git a/src/couchdb/couch_ref_counter.erl b/src/couchdb/couch_ref_counter.erl
index 96d92333..5a111ab6 100644
--- a/src/couchdb/couch_ref_counter.erl
+++ b/src/couchdb/couch_ref_counter.erl
@@ -24,7 +24,7 @@ drop(RefCounterPid) ->
     drop(RefCounterPid, self()).
 
 drop(RefCounterPid, Pid) ->
-    gen_server:cast(RefCounterPid, {drop, Pid}).
+    gen_server:call(RefCounterPid, {drop, Pid}).
 
 
 add(RefCounterPid) ->
@@ -66,10 +66,8 @@ handle_call({add, Pid},_From, #srv{referrers=Referrers}=Srv) ->
     {reply, ok, Srv#srv{referrers=Referrers2}};
 handle_call(count, _From, Srv) ->
     {monitors, Monitors} =  process_info(self(), monitors),
-    {reply, length(Monitors), Srv}.
-
-
-handle_cast({drop, Pid}, #srv{referrers=Referrers}=Srv) ->
+    {reply, length(Monitors), Srv};
+handle_call({drop, Pid}, _From, #srv{referrers=Referrers}=Srv) ->
     Referrers2 =
     case dict:find(Pid, Referrers) of
     {ok, {MonRef, 1}} ->
@@ -80,7 +78,16 @@ handle_cast({drop, Pid}, #srv{referrers=Referrers}=Srv) ->
     error ->
         Referrers
     end,
-    maybe_close_async(Srv#srv{referrers=Referrers2}).
+    Srv2 = Srv#srv{referrers=Referrers2},
+    case should_close() of
+    true ->
+        {stop,normal,ok,Srv2};
+    false ->
+        {reply, ok, Srv2}
+    end.
+
+handle_cast(Msg, _Srv)->
+    exit({unknown_msg,Msg}).
 
 
 code_change(_OldVsn, State, _Extra) ->
@@ -88,21 +95,17 @@ code_change(_OldVsn, State, _Extra) ->
 
 handle_info({'DOWN', MonRef, _, Pid, _}, #srv{referrers=Referrers}=Srv) ->
     {ok, {MonRef, _RefCount}} = dict:find(Pid, Referrers),
-    maybe_close_async(Srv#srv{referrers=dict:erase(Pid, Referrers)}).
+    Srv2 = Srv#srv{referrers=dict:erase(Pid, Referrers)},
+    case should_close() of
+    true ->
+        {stop,normal,Srv2};
+    false ->
+        {noreply,Srv2}
+    end.
 
 
 should_close() ->
     case process_info(self(), monitors) of
-    {monitors, []} ->
-        true;
-    _ ->
-        false
-    end.
-
-maybe_close_async(Srv) ->
-    case should_close() of
-    true ->
-        {stop,normal,Srv};
-    false ->
-        {noreply,Srv}
+    {monitors, []} ->   true;
+    _ ->                false
     end.
-- 
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