src/hotspot/share/gc/shared/concurrentGCThread.cpp

rev 51967 : 8221392: Reduce ConcurrentGCThreads spinning during start up
Reviewed-by: eosterlund, kbarrett

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 53,69 ****
    this->set_active_handles(JNIHandleBlock::allocate_block());
    // From this time Thread::current() should be working.
    assert(this == Thread::current(), "just checking");
  }
  
- void ConcurrentGCThread::wait_for_universe_init() {
-   MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
-   while (!is_init_completed() && !_should_terminate) {
-     CGC_lock->wait(Mutex::_no_safepoint_check_flag, 1);
-   }
- }
- 
  void ConcurrentGCThread::terminate() {
    assert(_should_terminate, "Should only be called on terminate request.");
    // Signal that it is terminated
    {
      MutexLockerEx mu(Terminator_lock,
--- 53,62 ----
*** 73,83 ****
    }
  }
  
  void ConcurrentGCThread::run() {
    initialize_in_thread();
!   wait_for_universe_init();
  
    run_service();
  
    terminate();
  }
--- 66,76 ----
    }
  }
  
  void ConcurrentGCThread::run() {
    initialize_in_thread();
!   wait_init_completed();
  
    run_service();
  
    terminate();
  }