Mercurial > hg > graal-compiler
comparison src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | e018e6884bd8 |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:a61af66fc99e |
---|---|
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 | |
35 void CMSLockVerifier::assert_locked(const Mutex* lock, const Mutex* p_lock) { | |
36 if (!Universe::is_fully_initialized()) { | |
37 return; | |
38 } | |
39 | |
40 Thread* myThread = Thread::current(); | |
41 | |
42 if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token | |
43 assert(p_lock == NULL, "Unexpected state"); | |
44 if (myThread->is_ConcurrentGC_thread()) { | |
45 // This test might have to change in the future, if there can be | |
46 // multiple peer CMS threads. But for now, if we're testing the CMS | |
47 assert(myThread == ConcurrentMarkSweepThread::cmst(), | |
48 "In CMS, CMS thread is the only Conc GC thread."); | |
49 assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(), | |
50 "CMS thread should have CMS token"); | |
51 } else if (myThread->is_VM_thread()) { | |
52 assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(), | |
53 "VM thread should have CMS token"); | |
54 } else { | |
55 // Token should be held on our behalf by one of the other | |
56 // of CMS or VM thread; not enough easily testable | |
57 // state info to test which here. | |
58 assert(myThread->is_GC_task_thread(), "Unexpected thread type"); | |
59 } | |
60 return; | |
61 } | |
62 | |
63 if (ParallelGCThreads == 0) { | |
64 assert_lock_strong(lock); | |
65 } else { | |
66 if (myThread->is_VM_thread() | |
67 || myThread->is_ConcurrentGC_thread() | |
68 || myThread->is_Java_thread()) { | |
69 // Make sure that we are holding the associated lock. | |
70 assert_lock_strong(lock); | |
71 // The checking of p_lock is a spl case for CFLS' free list | |
72 // locks: we make sure that none of the parallel GC work gang | |
73 // threads are holding "sub-locks" of freeListLock(). We check only | |
74 // the parDictionaryAllocLock because the others are too numerous. | |
75 // This spl case code is somewhat ugly and any improvements | |
76 // are welcome XXX FIX ME!! | |
77 if (p_lock != NULL) { | |
78 assert(!p_lock->is_locked() || p_lock->owned_by_self(), | |
79 "Possible race between this and parallel GC threads"); | |
80 } | |
81 } else if (myThread->is_GC_task_thread()) { | |
82 // Make sure that the VM or CMS thread holds lock on our behalf | |
83 // XXX If there were a concept of a gang_master for a (set of) | |
84 // gang_workers, we could have used the identity of that thread | |
85 // for checking ownership here; for now we just disjunct. | |
86 assert(lock->owner() == VMThread::vm_thread() || | |
87 lock->owner() == ConcurrentMarkSweepThread::cmst(), | |
88 "Should be locked by VM thread or CMS thread on my behalf"); | |
89 } else { | |
90 // Make sure we didn't miss some obscure corner case | |
91 ShouldNotReachHere(); | |
92 } | |
93 } | |
94 } | |
95 #endif |