Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp @ 1286:ab75c83d7c37
Merge
author | johnc |
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date | Tue, 02 Mar 2010 13:57:46 -0800 |
parents | e018e6884bd8 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved. | |
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_cmsLockVerifier.cpp.incl" | |
27 | |
28 ///////////// Locking verification specific to CMS ////////////// | |
29 // Much like "assert_lock_strong()", except that it relaxes the | |
30 // assertion somewhat for the parallel GC case, where VM thread | |
31 // or the CMS thread might hold the lock on behalf of the parallel | |
32 // threads. The second argument is in support of an extra locking | |
33 // check for CFL spaces' free list locks. | |
34 #ifndef PRODUCT | |
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35 void CMSLockVerifier::assert_locked(const Mutex* lock, |
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36 const Mutex* p_lock1, |
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37 const Mutex* p_lock2) { |
0 | 38 if (!Universe::is_fully_initialized()) { |
39 return; | |
40 } | |
41 | |
42 Thread* myThread = Thread::current(); | |
43 | |
44 if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token | |
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45 assert(p_lock1 == NULL && p_lock2 == NULL, "Unexpected caller error"); |
0 | 46 if (myThread->is_ConcurrentGC_thread()) { |
47 // This test might have to change in the future, if there can be | |
48 // multiple peer CMS threads. But for now, if we're testing the CMS | |
49 assert(myThread == ConcurrentMarkSweepThread::cmst(), | |
50 "In CMS, CMS thread is the only Conc GC thread."); | |
51 assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
52 "CMS thread should have CMS token"); | |
53 } else if (myThread->is_VM_thread()) { | |
54 assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(), | |
55 "VM thread should have CMS token"); | |
56 } else { | |
57 // Token should be held on our behalf by one of the other | |
58 // of CMS or VM thread; not enough easily testable | |
59 // state info to test which here. | |
60 assert(myThread->is_GC_task_thread(), "Unexpected thread type"); | |
61 } | |
62 return; | |
63 } | |
64 | |
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65 if (myThread->is_VM_thread() |
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66 || myThread->is_ConcurrentGC_thread() |
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67 || myThread->is_Java_thread()) { |
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68 // Make sure that we are holding the associated lock. |
0 | 69 assert_lock_strong(lock); |
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70 // The checking of p_lock is a spl case for CFLS' free list |
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71 // locks: we make sure that none of the parallel GC work gang |
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72 // threads are holding "sub-locks" of freeListLock(). We check only |
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73 // the parDictionaryAllocLock because the others are too numerous. |
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74 // This spl case code is somewhat ugly and any improvements |
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75 // are welcome. |
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76 assert(p_lock1 == NULL || !p_lock1->is_locked() || p_lock1->owned_by_self(), |
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77 "Possible race between this and parallel GC threads"); |
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78 assert(p_lock2 == NULL || !p_lock2->is_locked() || p_lock2->owned_by_self(), |
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79 "Possible race between this and parallel GC threads"); |
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80 } else if (myThread->is_GC_task_thread()) { |
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81 // Make sure that the VM or CMS thread holds lock on our behalf |
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82 // XXX If there were a concept of a gang_master for a (set of) |
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83 // gang_workers, we could have used the identity of that thread |
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84 // for checking ownership here; for now we just disjunct. |
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85 assert(lock->owner() == VMThread::vm_thread() || |
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86 lock->owner() == ConcurrentMarkSweepThread::cmst(), |
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87 "Should be locked by VM thread or CMS thread on my behalf"); |
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88 if (p_lock1 != NULL) { |
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89 assert_lock_strong(p_lock1); |
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90 } |
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91 if (p_lock2 != NULL) { |
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92 assert_lock_strong(p_lock2); |
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93 } |
0 | 94 } else { |
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95 // Make sure we didn't miss some other thread type calling into here; |
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96 // perhaps as a result of future VM evolution. |
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97 ShouldNotReachHere(); |
0 | 98 } |
99 } | |
100 #endif |