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[PATCH] unix_server: fix for infinite loop
From: |
Eric Wong |
Subject: |
[PATCH] unix_server: fix for infinite loop |
Date: |
Sat, 18 Oct 2014 10:18:32 +0000 |
Occasionally, killing a sink from an external process could result in an
infinite loop due to the lack of close notification from __dst_error (in
DTAS::Buffer) up to the top-level event loop. Since it is not easy to
notify the top-level event loop, we'll detect closed IOs after-the-fact
and retry as needed in a cold rescue path.
This fixes an occasional error (usually when using a non-parallel make)
in the test suite:
TestPlayerIntegration#test_sink_killed_during_play:
Timeout::Error: execution expired
$HOME/dtas/test/player_integration.rb:57:in `sleep'
$HOME/dtas/test/player_integration.rb:57:in `block in wait_pid_dead'
$HOME/$RUBY/lib/ruby/2.2.0/timeout.rb:91:in `block in timeout'
$HOME/$RUBY/lib/ruby/2.2.0/timeout.rb:35:in `block in catch'
$HOME/$RUBY/lib/ruby/2.2.0/timeout.rb:35:in `catch'
$HOME/$RUBY/lib/ruby/2.2.0/timeout.rb:35:in `catch'
$HOME/$RUBY/lib/ruby/2.2.0/timeout.rb:106:in `timeout'
$HOME/dtas/test/player_integration.rb:54:in `wait_pid_dead'
test/test_player_integration.rb:42:in `test_sink_killed_during_play'
---
lib/dtas/unix_server.rb | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/lib/dtas/unix_server.rb b/lib/dtas/unix_server.rb
index c3db9f4..4b26555 100644
--- a/lib/dtas/unix_server.rb
+++ b/lib/dtas/unix_server.rb
@@ -99,7 +99,13 @@ class DTAS::UNIXServer # :nodoc:
def run_once
# give IO.select one-shot behavior, snapshot and replace the watchlist
- r = IO.select(@readers.keys, @writers.keys) or return
+ begin
+ r = IO.select(@readers.keys, @writers.keys) or return
+ rescue IOError
+ # this only happens when sinks error out
+ @writers.delete_if { |io| io.to_io.closed? }
+ retry
+ end
@hot_read = r[0]
r[1].each do |io|
@writers.delete(io)
--
EW
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