--- a/src/hotspot/share/gc/g1/suspendibleThreadSet.cpp	Wed Oct 18 14:31:10 2017 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,134 +0,0 @@
-/*
- * Copyright (c) 2014, 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.
- *
- * 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.
- *
- */
-
-#include "precompiled.hpp"
-#include "gc/g1/suspendibleThreadSet.hpp"
-#include "runtime/mutexLocker.hpp"
-#include "runtime/semaphore.hpp"
-#include "runtime/thread.inline.hpp"
-
-uint   SuspendibleThreadSet::_nthreads          = 0;
-uint   SuspendibleThreadSet::_nthreads_stopped  = 0;
-bool   SuspendibleThreadSet::_suspend_all       = false;
-double SuspendibleThreadSet::_suspend_all_start = 0.0;
-
-static Semaphore* _synchronize_wakeup = NULL;
-
-void SuspendibleThreadSet_init() {
-  assert(_synchronize_wakeup == NULL, "STS already initialized");
-  _synchronize_wakeup = new Semaphore();
-}
-
-bool SuspendibleThreadSet::is_synchronized() {
-  assert_lock_strong(STS_lock);
-  assert(_nthreads_stopped <= _nthreads, "invariant");
-  return _nthreads_stopped == _nthreads;
-}
-
-void SuspendibleThreadSet::join() {
-  assert(!Thread::current()->is_suspendible_thread(), "Thread already joined");
-  MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
-  while (_suspend_all) {
-    ml.wait(Mutex::_no_safepoint_check_flag);
-  }
-  _nthreads++;
-  DEBUG_ONLY(Thread::current()->set_suspendible_thread();)
-}
-
-void SuspendibleThreadSet::leave() {
-  assert(Thread::current()->is_suspendible_thread(), "Thread not joined");
-  MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
-  assert(_nthreads > 0, "Invalid");
-  DEBUG_ONLY(Thread::current()->clear_suspendible_thread();)
-  _nthreads--;
-  if (_suspend_all && is_synchronized()) {
-    // This leave completes a request, so inform the requestor.
-    _synchronize_wakeup->signal();
-  }
-}
-
-void SuspendibleThreadSet::yield() {
-  assert(Thread::current()->is_suspendible_thread(), "Must have joined");
-  MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
-  if (_suspend_all) {
-    _nthreads_stopped++;
-    if (is_synchronized()) {
-      if (ConcGCYieldTimeout > 0) {
-        double now = os::elapsedTime();
-        guarantee((now - _suspend_all_start) * 1000.0 < (double)ConcGCYieldTimeout, "Long delay");
-      }
-      // This yield completes the request, so inform the requestor.
-      _synchronize_wakeup->signal();
-    }
-    while (_suspend_all) {
-      ml.wait(Mutex::_no_safepoint_check_flag);
-    }
-    assert(_nthreads_stopped > 0, "Invalid");
-    _nthreads_stopped--;
-  }
-}
-
-void SuspendibleThreadSet::synchronize() {
-  assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
-  if (ConcGCYieldTimeout > 0) {
-    _suspend_all_start = os::elapsedTime();
-  }
-  {
-    MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
-    assert(!_suspend_all, "Only one at a time");
-    _suspend_all = true;
-    if (is_synchronized()) {
-      return;
-    }
-  } // Release lock before semaphore wait.
-
-  // Semaphore initial count is zero.  To reach here, there must be at
-  // least one not yielded thread in the set, e.g. is_synchronized()
-  // was false before the lock was released.  A thread in the set will
-  // signal the semaphore iff it is the last to yield or leave while
-  // there is an active suspend request.  So there will be exactly one
-  // signal, which will increment the semaphore count to one, which
-  // will then be consumed by this wait, returning it to zero.  No
-  // thread can exit yield or enter the set until desynchronize is
-  // called, so there are no further opportunities for the semaphore
-  // being signaled until we get back here again for some later
-  // synchronize call.  Hence, there is no need to re-check for
-  // is_synchronized after the wait; it will always be true there.
-  _synchronize_wakeup->wait();
-
-#ifdef ASSERT
-  MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
-  assert(_suspend_all, "STS not synchronizing");
-  assert(is_synchronized(), "STS not synchronized");
-#endif
-}
-
-void SuspendibleThreadSet::desynchronize() {
-  assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
-  MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag);
-  assert(_suspend_all, "STS not synchronizing");
-  assert(is_synchronized(), "STS not synchronized");
-  _suspend_all = false;
-  ml.notify_all();
-}