1 files changed, 13 insertions, 14 deletions
diff --git a/absl/synchronization/internal/waiter.h b/absl/synchronization/internal/waiter.h
index c23897007e70..cac81d5fd226 100644
--- a/absl/synchronization/internal/waiter.h
+++ b/absl/synchronization/internal/waiter.h
@@ -58,14 +58,15 @@ namespace synchronization_internal {
 // Waiter is an OS-specific semaphore.
 class Waiter {
  public:
-  // No constructor, instances use the reserved space in ThreadIdentity.
-  // All initialization logic belongs in `Init()`.
-  Waiter() = delete;
+  // Prepare any data to track waits.
+  Waiter();
+
+  // Not copyable or movable
   Waiter(const Waiter&) = delete;
   Waiter& operator=(const Waiter&) = delete;
 
-  // Prepare any data to track waits.
-  void Init();
+  // Destroy any data to track waits.
+  ~Waiter();
 
   // Blocks the calling thread until a matching call to `Post()` or
   // `t` has passed. Returns `true` if woken (`Post()` called),
@@ -122,13 +123,8 @@ class Waiter {
   std::atomic<int> wakeups_;
 
 #elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_WIN32
-  // The Windows API has lots of choices for synchronization
-  // primivitives.  We are using SRWLOCK and CONDITION_VARIABLE
-  // because they don't require a destructor to release system
-  // resources.
-  //
-  // However, we can't include Windows.h in our headers, so we use aligned
-  // storage buffers to define the storage.
+  // We can't include Windows.h in our headers, so we use aligned storage
+  // buffers to define the storage of SRWLOCK and CONDITION_VARIABLE.
   using SRWLockStorage =
       typename std::aligned_storage<sizeof(void*), alignof(void*)>::type;
   using ConditionVariableStorage =
@@ -138,10 +134,13 @@ class Waiter {
   // condition variable storage once the types are complete.
   class WinHelper;
 
+  // REQUIRES: WinHelper::GetLock(this) must be held.
+  void InternalCondVarPoke();
+
   SRWLockStorage mu_storage_;
   ConditionVariableStorage cv_storage_;
-  std::atomic<int> waiter_count_;
-  std::atomic<int> wakeup_count_;
+  int waiter_count_;
+  int wakeup_count_;
 
 #else
   #error Unknown ABSL_WAITER_MODE