8167108: inconsistent handling of SR_lock can lead to crashes
Summary: Add Thread Safe Memory Reclamation (Thread-SMR) mechanism.
Reviewed-by: coleenp, dcubed, dholmes, eosterlund, gthornbr, kbarrett, rehn, sspitsyn, stefank
Contributed-by: daniel.daugherty@oracle.com, erik.osterlund@oracle.com, robbin.ehn@oracle.com
/*
* Copyright (c) 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.
*
* 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
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*/
#ifndef SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP
#define SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP
#include "runtime/atomic.hpp"
#include "runtime/prefetch.inline.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/threadSMR.hpp"
// Devirtualize known thread closure types.
template <class T>
inline void ThreadsList::threads_do_dispatch(T *cl, JavaThread *const thread) const {
cl->T::do_thread(thread);
}
template <>
inline void ThreadsList::threads_do_dispatch<ThreadClosure>(ThreadClosure *cl, JavaThread *const thread) const {
cl->do_thread(thread);
}
template <class T>
inline void ThreadsList::threads_do(T *cl) const {
const intx scan_interval = PrefetchScanIntervalInBytes;
JavaThread *const *const end = _threads + _length;
for (JavaThread *const *current_p = _threads; current_p != end; current_p++) {
Prefetch::read((void*)current_p, scan_interval);
JavaThread *const current = *current_p;
threads_do_dispatch(cl, current);
}
}
inline ThreadsList* ThreadsListSetter::list() {
ThreadsList *ret = _target->get_threads_hazard_ptr();
assert(ret != NULL, "hazard ptr should be set");
assert(!Thread::is_hazard_ptr_tagged(ret), "hazard ptr should be validated");
return ret;
}
#endif // SHARE_VM_RUNTIME_THREADSMR_INLINE_HPP