src/hotspot/share/gc/shared/taskqueue.hpp

rev 49680 : imported patch 6672778-partial-queue-trimming

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2017, 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, 2018, 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.
*** 283,295 ****
  
    // Push the task "t" on the queue.  Returns "false" iff the queue is full.
    inline bool push(E t);
  
    // Attempts to claim a task from the "local" end of the queue (the most
!   // recently pushed).  If successful, returns true and sets t to the task;
!   // otherwise, returns false (the queue is empty).
!   inline bool pop_local(volatile E& t);
  
    // Like pop_local(), but uses the "global" end of the queue (the least
    // recently pushed).
    bool pop_global(volatile E& t);
  
--- 283,296 ----
  
    // Push the task "t" on the queue.  Returns "false" iff the queue is full.
    inline bool push(E t);
  
    // Attempts to claim a task from the "local" end of the queue (the most
!   // recently pushed) as long as the number of entries exceeds the threshold. 
!   // If successful, returns true and sets t to the task; otherwise, returns false
!   // (the queue is empty or the number of elements below the threshold).
!   inline bool pop_local(volatile E& t, uint threshold = 0);
    
    // Like pop_local(), but uses the "global" end of the queue (the least
    // recently pushed).
    bool pop_global(volatile E& t);