From abccaf9596461215fce0e32322133fb6c39be44f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 10 Feb 2017 08:15:48 +0200
Subject: Implement parallel error propagation, keep_going mode

Keep going is the default but there is now the -s|--serial-stop that makes
the driver run serially and stop at first error.

Also fix some lockups, other minor improvements/features.
---
 build2/algorithm.ixx | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

(limited to 'build2/algorithm.ixx')

diff --git a/build2/algorithm.ixx b/build2/algorithm.ixx
index 33a5fe0..6bc310f 100644
--- a/build2/algorithm.ixx
+++ b/build2/algorithm.ixx
@@ -71,10 +71,8 @@ namespace build2
     if (!t.recipe (a))
       match_impl (ml, a, t, true);
 
-    //@@ MT
-    //
-    t.dependents++;
-    dependency_count++;
+    t.dependents.fetch_add (1, std::memory_order_release);
+    dependency_count.fetch_add (1, std::memory_order_release);
 
     // text << "M " << t << ": " << t.dependents << " " << dependency_count;
   }
@@ -86,11 +84,14 @@ namespace build2
 
     assert (phase == run_phase::search_match);
 
-    //@@ MT
-    //
-    assert (t.dependents != 0 && dependency_count != 0);
-    t.dependents--;
-    dependency_count--;
+#ifndef NDEBUG
+    size_t td (t.dependents--);
+    size_t gd (dependency_count--);
+    assert (td != 0 && gd != 0);
+#else
+    t.dependents.fetch_sub (1, std::memory_order_release);
+    dependency_count.fetch_sub (1, std::memory_order_release);
+#endif
   }
 
   inline void
-- 
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