content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.agrona.concurrent;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  /**
   * Control the use of high-resolution timers on Windows by a bit of hackery.
   */
  public final class HighResolutionTimer
  {
      private static final AtomicReference<Thread> THREAD = new AtomicReference<>();
  
      private HighResolutionTimer()
      {
      }
  
      /**
       * Has the high resolution timer been enabled?
       *
       * @return true if we believe it is enabled otherwise false.
       */
      public static boolean isEnabled()
      {
          return null != THREAD.get();
      }
  
      /**
       * Attempt to enable high resolution timers.
       */
      public static void enable()
      {
          if (null == THREAD.get())
          {
              final Thread t = new Thread(HighResolutionTimer::run);
              if (THREAD.compareAndSet(null, t))
              {
                  t.setDaemon(true);
                  t.setName("high-resolution-timer-hack");
                  t.start();
              }
          }
      }
  
      /**
       * Attempt to disable the high resolution timers.
       */
      public static void disable()
      {
          final Thread thread = THREAD.getAndSet(null);
          if (null != thread)
          {
              thread.interrupt();
          }
      }
  
      private static void run()
      {
          try
          {
              Thread.sleep(Long.MAX_VALUE);
          }
          catch (final InterruptedException ignore)
          {
          }
  
          THREAD.set(null);
      }
  }
  