promise: set_..._at_thread_exit

[viboes]

~promise needs to check if the promise shared state will be set at thread exit and set_exception_and_thread_exit needs to set this state.

Index: future.hpp
===================================================================
--- future.hpp	(revision 84678)
+++ future.hpp	(working copy)
@@ -443,6 +443,7 @@
                   throw_exception(promise_already_satisfied());
               }
               exception=e;
+              this->is_constructed = true;
               get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
             }
             bool has_value()
@@ -1746,7 +1747,7 @@
             {
                 boost::unique_lock<boost::mutex> lock(future_->mutex);
 
-                if(!future_->done)
+                if(!future_->done && !future_->is_constructed)
                 {
                     future_->mark_exceptional_finish_internal(boost::copy_exception(broken_promise()), lock);
                 }
@@ -1915,7 +1916,7 @@
             {
                 boost::unique_lock<boost::mutex> lock(future_->mutex);
 
-                if(!future_->done)
+                if(!future_->done && !future_->is_constructed)
                 {
                     future_->mark_exceptional_finish_internal(boost::copy_exception(broken_promise()), lock);
                 }
@@ -2057,7 +2058,7 @@
             {
                 boost::unique_lock<boost::mutex> lock(future_->mutex);
 
-                if(!future_->done)
+                if(!future_->done && !future_->is_constructed)
                 {
                     future_->mark_exceptional_finish_internal(boost::copy_exception(broken_promise()), lock);
                 }

[viboes]

(In [84717]) Thread: fix #8550, #8671, #8672.