1 files changed, 5 insertions, 3 deletions
diff --git a/third_party/abseil-cpp/absl/synchronization/blocking_counter.h b/third_party/abseil-cpp/absl/synchronization/blocking_counter.h
index 1f53f9f240..1908fdb1d9 100644
--- a/third_party/abseil-cpp/absl/synchronization/blocking_counter.h
+++ b/third_party/abseil-cpp/absl/synchronization/blocking_counter.h
@@ -20,6 +20,8 @@
 #ifndef ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
 #define ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
 
+#include <atomic>
+
 #include "absl/base/thread_annotations.h"
 #include "absl/synchronization/mutex.h"
 
@@ -60,8 +62,7 @@ ABSL_NAMESPACE_BEGIN
 //
 class BlockingCounter {
  public:
-  explicit BlockingCounter(int initial_count)
-      : count_(initial_count), num_waiting_(0) {}
+  explicit BlockingCounter(int initial_count);
 
   BlockingCounter(const BlockingCounter&) = delete;
   BlockingCounter& operator=(const BlockingCounter&) = delete;
@@ -89,8 +90,9 @@ class BlockingCounter {
 
  private:
   Mutex lock_;
-  int count_ ABSL_GUARDED_BY(lock_);
+  std::atomic<int> count_;
   int num_waiting_ ABSL_GUARDED_BY(lock_);
+  bool done_ ABSL_GUARDED_BY(lock_);
 };
 
 ABSL_NAMESPACE_END