Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/park.cpp @ 18096:ca6d25be853b jdk8u25-b13
8044269: Analysis of archive files.
Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | 0e6af9b390af |
| children | 2c95095271e9 |
| rev | line source |
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| 1878 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 1878 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "runtime/thread.hpp" | |
| 1878 | 27 |
| 28 | |
| 29 | |
| 30 // Lifecycle management for TSM ParkEvents. | |
| 31 // ParkEvents are type-stable (TSM). | |
| 32 // In our particular implementation they happen to be immortal. | |
| 33 // | |
| 34 // We manage concurrency on the FreeList with a CAS-based | |
| 35 // detach-modify-reattach idiom that avoids the ABA problems | |
| 36 // that would otherwise be present in a simple CAS-based | |
| 37 // push-pop implementation. (push-one and pop-all) | |
| 38 // | |
| 39 // Caveat: Allocate() and Release() may be called from threads | |
| 40 // other than the thread associated with the Event! | |
| 41 // If we need to call Allocate() when running as the thread in | |
| 42 // question then look for the PD calls to initialize native TLS. | |
| 43 // Native TLS (Win32/Linux/Solaris) can only be initialized or | |
| 44 // accessed by the associated thread. | |
| 45 // See also pd_initialize(). | |
| 46 // | |
| 47 // Note that we could defer associating a ParkEvent with a thread | |
| 48 // until the 1st time the thread calls park(). unpark() calls to | |
| 49 // an unprovisioned thread would be ignored. The first park() call | |
| 50 // for a thread would allocate and associate a ParkEvent and return | |
| 51 // immediately. | |
| 52 | |
| 53 volatile int ParkEvent::ListLock = 0 ; | |
| 54 ParkEvent * volatile ParkEvent::FreeList = NULL ; | |
| 55 | |
| 56 ParkEvent * ParkEvent::Allocate (Thread * t) { | |
| 57 // In rare cases -- JVM_RawMonitor* operations -- we can find t == null. | |
| 58 ParkEvent * ev ; | |
| 59 | |
| 60 // Start by trying to recycle an existing but unassociated | |
| 61 // ParkEvent from the global free list. | |
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62 // Using a spin lock since we are part of the mutex impl. |
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63 // 8028280: using concurrent free list without memory management can leak |
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64 // pretty badly it turns out. |
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65 Thread::SpinAcquire(&ListLock, "ParkEventFreeListAllocate"); |
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66 { |
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67 ev = FreeList; |
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68 if (ev != NULL) { |
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69 FreeList = ev->FreeNext; |
| 1878 | 70 } |
| 71 } | |
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72 Thread::SpinRelease(&ListLock); |
| 1878 | 73 |
| 74 if (ev != NULL) { | |
| 75 guarantee (ev->AssociatedWith == NULL, "invariant") ; | |
| 76 } else { | |
| 77 // Do this the hard way -- materialize a new ParkEvent. | |
| 78 ev = new ParkEvent () ; | |
| 79 guarantee ((intptr_t(ev) & 0xFF) == 0, "invariant") ; | |
| 80 } | |
| 81 ev->reset() ; // courtesy to caller | |
| 82 ev->AssociatedWith = t ; // Associate ev with t | |
| 83 ev->FreeNext = NULL ; | |
| 84 return ev ; | |
| 85 } | |
| 86 | |
| 87 void ParkEvent::Release (ParkEvent * ev) { | |
| 88 if (ev == NULL) return ; | |
| 89 guarantee (ev->FreeNext == NULL , "invariant") ; | |
| 90 ev->AssociatedWith = NULL ; | |
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91 // Note that if we didn't have the TSM/immortal constraint, then |
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92 // when reattaching we could trim the list. |
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93 Thread::SpinAcquire(&ListLock, "ParkEventFreeListRelease"); |
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94 { |
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95 ev->FreeNext = FreeList; |
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96 FreeList = ev; |
| 1878 | 97 } |
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98 Thread::SpinRelease(&ListLock); |
| 1878 | 99 } |
| 100 | |
| 101 // Override operator new and delete so we can ensure that the | |
| 102 // least significant byte of ParkEvent addresses is 0. | |
| 103 // Beware that excessive address alignment is undesirable | |
| 104 // as it can result in D$ index usage imbalance as | |
| 105 // well as bank access imbalance on Niagara-like platforms, | |
| 106 // although Niagara's hash function should help. | |
| 107 | |
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108 void * ParkEvent::operator new (size_t sz) throw() { |
| 6197 | 109 return (void *) ((intptr_t (AllocateHeap(sz + 256, mtInternal, CALLER_PC)) + 256) & -256) ; |
| 1878 | 110 } |
| 111 | |
| 112 void ParkEvent::operator delete (void * a) { | |
| 113 // ParkEvents are type-stable and immortal ... | |
| 114 ShouldNotReachHere(); | |
| 115 } | |
| 116 | |
| 117 | |
| 118 // 6399321 As a temporary measure we copied & modified the ParkEvent:: | |
| 119 // allocate() and release() code for use by Parkers. The Parker:: forms | |
| 120 // will eventually be removed as we consolide and shift over to ParkEvents | |
| 121 // for both builtin synchronization and JSR166 operations. | |
| 122 | |
| 123 volatile int Parker::ListLock = 0 ; | |
| 124 Parker * volatile Parker::FreeList = NULL ; | |
| 125 | |
| 126 Parker * Parker::Allocate (JavaThread * t) { | |
| 127 guarantee (t != NULL, "invariant") ; | |
| 128 Parker * p ; | |
| 129 | |
| 130 // Start by trying to recycle an existing but unassociated | |
| 131 // Parker from the global free list. | |
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132 // 8028280: using concurrent free list without memory management can leak |
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133 // pretty badly it turns out. |
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134 Thread::SpinAcquire(&ListLock, "ParkerFreeListAllocate"); |
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135 { |
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136 p = FreeList; |
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137 if (p != NULL) { |
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138 FreeList = p->FreeNext; |
| 1878 | 139 } |
| 140 } | |
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141 Thread::SpinRelease(&ListLock); |
| 1878 | 142 |
| 143 if (p != NULL) { | |
| 144 guarantee (p->AssociatedWith == NULL, "invariant") ; | |
| 145 } else { | |
| 146 // Do this the hard way -- materialize a new Parker.. | |
| 147 p = new Parker() ; | |
| 148 } | |
| 149 p->AssociatedWith = t ; // Associate p with t | |
| 150 p->FreeNext = NULL ; | |
| 151 return p ; | |
| 152 } | |
| 153 | |
| 154 | |
| 155 void Parker::Release (Parker * p) { | |
| 156 if (p == NULL) return ; | |
| 157 guarantee (p->AssociatedWith != NULL, "invariant") ; | |
| 158 guarantee (p->FreeNext == NULL , "invariant") ; | |
| 159 p->AssociatedWith = NULL ; | |
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160 |
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161 Thread::SpinAcquire(&ListLock, "ParkerFreeListRelease"); |
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162 { |
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163 p->FreeNext = FreeList; |
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164 FreeList = p; |
| 1878 | 165 } |
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166 Thread::SpinRelease(&ListLock); |
| 1878 | 167 } |
| 168 |