[couchdb] 02/04: Fix use of process_info(Pid, monitored_by)

[da...@apache.org]

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davisp pushed a commit to branch fix-erlang-21-eunit-failures
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit 4796f8cc9bcd05362ba2de1d67ff5e964f7514ba
Author: Paul J. Davis <pa...@gmail.com>
AuthorDate: Thu Jun 21 16:23:32 2018 -0500

    Fix use of process_info(Pid, monitored_by)
    
    This can now return references that are from NIFs monitoring the
    process. This is important for the new file IO NIFs that monitor the
    controlling process. For now we'll just take the easy way out by
    filtering the references from our returned monitor lists.
---
 src/couch/src/couch_bt_engine.erl | 2 +-
 src/couch/src/couch_file.erl      | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/couch/src/couch_bt_engine.erl b/src/couch/src/couch_bt_engine.erl
index 43a77b0..7028997 100644
--- a/src/couch/src/couch_bt_engine.erl
+++ b/src/couch/src/couch_bt_engine.erl
@@ -185,7 +185,7 @@ decref(St) ->
 monitored_by(St) ->
     case erlang:process_info(St#st.fd, monitored_by) of
         {monitored_by, Pids} ->
-            Pids;
+            lists:filter(fun is_pid/1, Pids);
         _ ->
             []
     end.
diff --git a/src/couch/src/couch_file.erl b/src/couch/src/couch_file.erl
index 9f668ea..af06b91 100644
--- a/src/couch/src/couch_file.erl
+++ b/src/couch/src/couch_file.erl
@@ -129,7 +129,7 @@ append_term_md5(Fd, Term, Options) ->
 
 append_binary(Fd, Bin) ->
     ioq:call(Fd, {append_bin, assemble_file_chunk(Bin)}, erlang:get(io_priority)).
-    
+
 append_binary_md5(Fd, Bin) ->
     ioq:call(Fd,
         {append_bin, assemble_file_chunk(Bin, crypto:hash(md5, Bin))},
@@ -701,7 +701,8 @@ is_idle(#file{is_sys=true}) ->
     end;
 is_idle(#file{is_sys=false}) ->
     Tracker = whereis(couch_stats_process_tracker),
-    case process_info(self(), monitored_by) of
+    {monitored_by, PidsAndRefs} = process_info(self(), monitored_by),
+    case lists:filter(fun is_pid/1, PidsAndRefs) of
         {monitored_by, []} -> true;
         {monitored_by, [Tracker]} -> true;
         {monitored_by, [_]} -> exit(tracker_monitoring_failed);