join.hpp: Apply no-theft optimisation in final_suspend

e44d5e85 · Xavier Thompson · 607b3753 · e44d5e85
Commit e44d5e85 authored Jun 20, 2022 by Xavier Thompson
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rt/include/typon/core/join.hpp rt/include/typon/core/join.hpp +4 -0

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--- a/rt/include/typon/core/join.hpp
+++ b/rt/include/typon/core/join.hpp
@@ -122,6 +122,10 @@ namespace typon
          {
            Continuation::Data & data = coroutine.promise()._data;
            u64 thefts = data._thefts;
+            if (thefts == 0)
+            {
+              return data._continuation;
+            }
            u64 n = data._n.fetch_sub(UMAX - thefts, std::memory_order_acq_rel);
            if (n - (UMAX - thefts) == 0)
            {