From 91faeff9492b3b4d014863b424329f138efdb185 Mon Sep 17 00:00:00 2001
From: Jason Dillaman <dillaman@redhat.com>
Date: Wed, 8 Apr 2015 21:48:21 -0400
Subject: [PATCH 17/22] Throttle: added pending_error method to SimpleThrottle

Allow the client of SimpleThrottle to detect an async error
so that it can exit early.

Signed-off-by: Jason Dillaman <dillaman@redhat.com>
(cherry picked from commit b88b88c5df91325fb713c2031a56bffe421268e0)
(cherry picked from commit c2ea7e85dcbca60e6ae09d4ef99d02834d02b2ed)
---
 src/common/Throttle.cc | 6 ++++++
 src/common/Throttle.h  | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/common/Throttle.cc b/src/common/Throttle.cc
index 026d731..5c68a1f 100644
--- a/src/common/Throttle.cc
+++ b/src/common/Throttle.cc
@@ -267,6 +267,12 @@ void SimpleThrottle::end_op(int r)
   m_cond.Signal();
 }
 
+bool SimpleThrottle::pending_error() const
+{
+  Mutex::Locker l(m_lock);
+  return (m_ret < 0);
+}
+
 int SimpleThrottle::wait_for_ret()
 {
   Mutex::Locker l(m_lock);
diff --git a/src/common/Throttle.h b/src/common/Throttle.h
index 6d03988..b171e27 100644
--- a/src/common/Throttle.h
+++ b/src/common/Throttle.h
@@ -76,9 +76,10 @@ public:
   ~SimpleThrottle();
   void start_op();
   void end_op(int r);
+  bool pending_error() const;
   int wait_for_ret();
 private:
-  Mutex m_lock;
+  mutable Mutex m_lock;
   Cond m_cond;
   uint64_t m_max;
   uint64_t m_current;
-- 
2.1.0