Remove SafePointBarrier::parkOthers

third_party/WebKit/Source/platform/heap/SafePoint.h

Index: third_party/WebKit/Source/platform/heap/SafePoint.h
diff --git a/third_party/WebKit/Source/platform/heap/SafePoint.h b/third_party/WebKit/Source/platform/heap/SafePoint.h
index 727b8cfca5cceef52e7da84e496784eb18f68831..4b1bfcd12243ebf1167ba2c9534a3678eaf74101 100644
--- a/third_party/WebKit/Source/platform/heap/SafePoint.h
+++ b/third_party/WebKit/Source/platform/heap/SafePoint.h
@@ -96,65 +96,18 @@ class SafePointBarrier final {
   SafePointBarrier();
   ~SafePointBarrier();
 
-  // Request other attached threads that are not at safe points to park
-  // themselves on safepoints.
-  bool parkOthers();
-
-  // Resume executions of other attached threads that are parked at
-  // the safe points.
-  void resumeOthers(bool barrierLocked = false);
-
-  // Park this thread if there exists a request to park attached threads.
-  // This method must be called at a safe point.
-  void checkAndPark(ThreadState*, SafePointAwareMutexLocker* = nullptr);
-
   void enterSafePoint(ThreadState*);
   void leaveSafePoint(ThreadState*, SafePointAwareMutexLocker* = nullptr);
 
  private:
   void doPark(ThreadState*, intptr_t* stackEnd);
-  static void parkAfterPushRegisters(SafePointBarrier* barrier,
-                                     ThreadState* state,
-                                     intptr_t* stackEnd) {
-    barrier->doPark(state, stackEnd);
-  }
   void doEnterSafePoint(ThreadState*, intptr_t* stackEnd);
   static void enterSafePointAfterPushRegisters(SafePointBarrier* barrier,
                                                ThreadState* state,
                                                intptr_t* stackEnd) {
     barrier->doEnterSafePoint(state, stackEnd);
   }
-
-  // |m_unparkedThreadCount| tracks amount of unparked threads. It is
-  // positive if and only if a thread has requested the other threads
-  // to park themselves at safe-points in preparation for a GC.
-  //
-  // The last thread to park itself will make the counter hit zero
-  // and should notify GC-requesting thread that it is safe to proceed.
-  //
-  // If no other thread is waiting for other threads to park then
-  // this counter can be negative: if N threads are at safe-points
-  // the counter will be -N.
-  volatile int m_unparkedThreadCount;
-
-  // |m_parkingRequested| is used to control the transition of threads parked
-  // at a safepoint back to running state. In the event a thread requests
-  // another GC, threads that have yet to leave their safepoint (due to lock
-  // contention, scheduling etc), shouldn't be allowed to leave, but continue
-  // being parked when they do end up getting to run.
-  //
-  // |m_parkingRequested| is set when parkOthers() runs, and cleared by
-  // resumeOthers(), when the global GC steps have completed.
-  //
-  // Threads that were parked after they were requested to and then signalled,
-  // check that no other thread has made another parking request when attempting
-  // to resume in doPark().
-  volatile int m_parkingRequested;
-
   Mutex m_mutex;
-
-  ThreadCondition m_parked;
-  ThreadCondition m_resume;
 };
 
 }  // namespace blink