event_count.hpp: Fix no waiter optimisation

1f2d6e99 · Xavier Thompson · da6a75a1 · 1f2d6e99
Commit 1f2d6e99 authored Jun 03, 2022 by Xavier Thompson
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Showing with 8 additions and 4 deletions

rt/include/typon/fundamental/event_count.hpp rt/include/typon/fundamental/event_count.hpp +8 -4

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--- a/rt/include/typon/fundamental/event_count.hpp
+++ b/rt/include/typon/fundamental/event_count.hpp
@@ -47,14 +47,18 @@ namespace typon::fdt::lock_free

    void notify_one() noexcept
    {
-      _state.fetch_add(shift, std::memory_order_acq_rel);
-      _state.notify_one();
+      if (_state.fetch_add(shift, std::memory_order_acq_rel) & mask)
+      {
+        _state.notify_one();
+      }
    }

    void notify_all() noexcept
    {
-      _state.fetch_add(shift, std::memory_order_acq_rel);
-      _state.notify_all();
+      if (_state.fetch_add(shift, std::memory_order_acq_rel) & mask)
+      {
+        _state.notify_all();
+      }
    }
  };