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xCPU.cpp 
67 строк · 2.2 Кб
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/*
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 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#include "precompiled.hpp"
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#include "gc/shared/gcLogPrecious.hpp"
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#include "gc/x/xCPU.inline.hpp"
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#include "memory/padded.inline.hpp"
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#include "runtime/javaThread.hpp"
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#include "runtime/os.hpp"
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#include "utilities/debug.hpp"
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#define XCPU_UNKNOWN_AFFINITY ((Thread*)-1)
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#define XCPU_UNKNOWN_SELF     ((Thread*)-2)
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PaddedEnd<XCPU::XCPUAffinity>* XCPU::_affinity = nullptr;
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THREAD_LOCAL Thread*           XCPU::_self     = XCPU_UNKNOWN_SELF;
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THREAD_LOCAL uint32_t          XCPU::_cpu      = 0;
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void XCPU::initialize() {
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  assert(_affinity == nullptr, "Already initialized");
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  const uint32_t ncpus = count();
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  _affinity = PaddedArray<XCPUAffinity, mtGC>::create_unfreeable(ncpus);
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  for (uint32_t i = 0; i < ncpus; i++) {
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    _affinity[i]._thread = XCPU_UNKNOWN_AFFINITY;
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  }
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  log_info_p(gc, init)("CPUs: %u total, %u available",
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                       os::processor_count(),
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                       os::initial_active_processor_count());
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}
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uint32_t XCPU::id_slow() {
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  // Set current thread
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  if (_self == XCPU_UNKNOWN_SELF) {
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    _self = Thread::current();
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  }
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  // Set current CPU
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  _cpu = os::processor_id();
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  // Update affinity table
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  _affinity[_cpu]._thread = _self;
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  return _cpu;
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}
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