/*
 * Copyright (c) 1998, 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.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

// no precompiled headers
#include "runtime/orderAccess.hpp"
#include "runtime/os.hpp"
#include "runtime/osThread.hpp"

void OSThread::pd_initialize() {
  set_thread_handle(NULL);
  set_thread_id(NULL);
  set_interrupt_event(NULL);
}

void OSThread::pd_destroy() {
  if (_interrupt_event != NULL) {
    CloseHandle(_interrupt_event);
  }
}

// We need to specialize these to interact with the _interrupt_event.

volatile bool OSThread::interrupted() {
  return _interrupted != 0 &&
    (WaitForSingleObject(_interrupt_event, 0) == WAIT_OBJECT_0);
}

void OSThread::set_interrupted(bool z) {
  if (z) {
    _interrupted = 1;
    // More than one thread can get here with the same value of osthread,
    // resulting in multiple notifications.  We do, however, want the store
    // to interrupted() to be visible to other threads before we post
    // the interrupt event.
    OrderAccess::release();
    SetEvent(_interrupt_event);
  }
  else {
    // We should only ever clear the interrupt if we are in fact interrupted,
    // and this can only be done by the current thread on itself.
    assert(_interrupted == 1, "invariant for clearing interrupt state");
    _interrupted = 0;
    ResetEvent(_interrupt_event);
  }
}