libstore: add explicit in-build-slot-ness to goals

we don't need to expose information about how busy a Worker is if the
worker can instead tell its work items whether they are in a slot. in
the future we might use this to not start items waiting for a slot if
no slots are currently available, but that requires more preparation.

Change-Id: Ibe01ac536da7e6d6f80520164117c43e772f9bd9

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/build/goal.hh b/src/libstore/build/goal.hh
index 5d7bb72b8..fd7534b0a 100644
--- a/src/libstore/build/goal.hh
+++ b/src/libstore/build/goal.hh
@@ -147,7 +147,7 @@ public:
         trace("goal destroyed");
     }
 
-    virtual WorkResult work() = 0;
+    virtual WorkResult work(bool inBuildSlot) = 0;
 
     virtual void waiteeDone(GoalPtr waitee) { }