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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/heapRegionSets.hpp"
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27
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28 //////////////////// FreeRegionList ////////////////////
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29
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30 const char* FreeRegionList::verify_region_extra(HeapRegion* hr) {
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31 if (hr->is_young()) {
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32 return "the region should not be young";
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33 }
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34 // The superclass will check that the region is empty and
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35 // not-humongous.
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36 return HeapRegionLinkedList::verify_region_extra(hr);
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37 }
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38
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39 //////////////////// MasterFreeRegionList ////////////////////
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40
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41 bool MasterFreeRegionList::check_mt_safety() {
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42 // Master Free List MT safety protocol:
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43 // (a) If we're at a safepoint, operations on the master free list
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44 // should be invoked by either the VM thread (which will serialize
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45 // them) or by the GC workers while holding the
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46 // FreeList_lock.
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47 // (b) If we're not at a safepoint, operations on the master free
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48 // list should be invoked while holding the Heap_lock.
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49
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50 guarantee((SafepointSynchronize::is_at_safepoint() &&
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51 (Thread::current()->is_VM_thread() ||
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52 FreeList_lock->owned_by_self())) ||
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53 (!SafepointSynchronize::is_at_safepoint() &&
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54 Heap_lock->owned_by_self()),
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55 hrs_ext_msg(this, "master free list MT safety protocol"));
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56
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57 return FreeRegionList::check_mt_safety();
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58 }
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59
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60 //////////////////// SecondaryFreeRegionList ////////////////////
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61
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62 bool SecondaryFreeRegionList::check_mt_safety() {
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63 // Secondary Free List MT safety protocol:
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64 // Operations on the secondary free list should always be invoked
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65 // while holding the SecondaryFreeList_lock.
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66
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67 guarantee(SecondaryFreeList_lock->owned_by_self(),
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68 hrs_ext_msg(this, "secondary free list MT safety protocol"));
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69
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70 return FreeRegionList::check_mt_safety();
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71 }
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72
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73 //////////////////// HumongousRegionSet ////////////////////
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74
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75 const char* HumongousRegionSet::verify_region_extra(HeapRegion* hr) {
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76 if (hr->is_young()) {
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77 return "the region should not be young";
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78 }
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79 // The superclass will check that the region is not empty and
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80 // humongous.
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81 return HeapRegionSet::verify_region_extra(hr);
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82 }
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83
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84 //////////////////// MasterHumongousRegionSet ////////////////////
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85
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86 bool MasterHumongousRegionSet::check_mt_safety() {
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87 // Master Humongous Set MT safety protocol:
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88 // (a) If we're at a safepoint, operations on the master humongous
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89 // set should be invoked by either the VM thread (which will
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90 // serialize them) or by the GC workers while holding the
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91 // OldSets_lock.
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92 // (b) If we're not at a safepoint, operations on the master
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93 // humongous set should be invoked while holding the Heap_lock.
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94
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95 guarantee((SafepointSynchronize::is_at_safepoint() &&
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96 (Thread::current()->is_VM_thread() ||
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97 OldSets_lock->owned_by_self())) ||
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98 (!SafepointSynchronize::is_at_safepoint() &&
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99 Heap_lock->owned_by_self()),
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100 hrs_ext_msg(this, "master humongous set MT safety protocol"));
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101 return HumongousRegionSet::check_mt_safety();
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102 }
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