From 46017d9e4d61e89dd1f3fb44cb662b8d65697058 Mon Sep 17 00:00:00 2001
From: Kirk Shoop <kirk.shoop@microsoft.com>
Date: Mon, 28 Apr 2014 16:16:32 -0700
Subject: fixes and test for take

---
 Rx/v2/src/rxcpp/operators/rx-take_until.hpp | 30 ++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

(limited to 'Rx/v2/src/rxcpp/operators/rx-take_until.hpp')

diff --git a/Rx/v2/src/rxcpp/operators/rx-take_until.hpp b/Rx/v2/src/rxcpp/operators/rx-take_until.hpp
index 608cde4..c93d568 100644
--- a/Rx/v2/src/rxcpp/operators/rx-take_until.hpp
+++ b/Rx/v2/src/rxcpp/operators/rx-take_until.hpp
@@ -63,6 +63,7 @@ struct take_until : public operator_base<T>
             }
             mutable std::atomic<typename mode::type> mode_value;
             mutable std::atomic<int> busy;
+            mutable std::mutex error_lock;
             mutable std::exception_ptr exception;
             output_type out;
         };
@@ -81,6 +82,7 @@ struct take_until : public operator_base<T>
                         if (fin == mode::triggered) {
                             st->out.on_completed();
                         } else if (fin == mode::errored) {
+                            std::unique_lock<std::mutex> guard(st->error_lock);
                             st->out.on_error(st->exception);
                         }
                     }
@@ -100,18 +102,26 @@ struct take_until : public operator_base<T>
         // on_next
             [state](const typename trigger_source_type::value_type&) {
                 activity finisher(state);
-                state->mode_value = mode::triggered;
+                typename mode::type v = state->mode_value;
+                if (v != mode::taking) {return;}
+                state->mode_value.compare_exchange_strong(v, mode::triggered);
             },
         // on_error
             [state](std::exception_ptr e) {
                 activity finisher(state);
-                state->exception = e;
-                state->mode_value = mode::errored;
+                std::unique_lock<std::mutex> guard(state->error_lock);
+                typename mode::type v = state->mode_value;
+                if (v != mode::taking) {return;}
+                if (state->mode_value.compare_exchange_strong(v, mode::errored)) {
+                    state->exception = e;
+                }
             },
         // on_completed
             [state]() {
                 activity finisher(state);
-                state->mode_value = mode::clear;
+                typename mode::type v = state->mode_value;
+                if (v != mode::taking) {return;}
+                state->mode_value.compare_exchange_strong(v, mode::clear);
             }
         );
 
@@ -128,13 +138,19 @@ struct take_until : public operator_base<T>
         // on_error
             [state](std::exception_ptr e) {
                 activity finisher(state);
-                state->exception = e;
-                state->mode_value = mode::errored;
+                std::unique_lock<std::mutex> guard(state->error_lock);
+                typename mode::type v = state->mode_value;
+                if (v < mode::triggered) {return;}
+                if (state->mode_value.compare_exchange_strong(v, mode::errored)) {
+                    state->exception = e;
+                }
             },
         // on_completed
             [state]() {
                 activity finisher(state);
-                state->mode_value = mode::triggered;
+                typename mode::type v = state->mode_value;
+                if (v < mode::triggered) {return;}
+                state->mode_value.compare_exchange_strong(v, mode::triggered);
             }
         );
     }
-- 
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