Mercurial > hg > truffle

annotate src/share/vm/memory/gcLocker.cpp @ 4867:1a2723f7ad8e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale Reviewed-by: kvn, iveresov, dholmes
author never
date Sun, 29 Jan 2012 16:46:04 -0800
parents f95d63e2154a
children 0382d2b469b2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1 /*
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load
duke
parents:
diff changeset
4 *
a61af66fc99e Initial load
duke
parents:
diff changeset
5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load
duke
parents:
diff changeset
6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load
duke
parents:
diff changeset
7 * published by the Free Software Foundation.
a61af66fc99e Initial load
duke
parents:
diff changeset
8 *
a61af66fc99e Initial load
duke
parents:
diff changeset
9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load
duke
parents:
diff changeset
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load
duke
parents:
diff changeset
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load
duke
parents:
diff changeset
12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load
duke
parents:
diff changeset
13 * accompanied this code).
a61af66fc99e Initial load
duke
parents:
diff changeset
14 *
a61af66fc99e Initial load
duke
parents:
diff changeset
15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load
duke
parents:
diff changeset
16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load
duke
parents:
diff changeset
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load
duke
parents:
diff changeset
18 *
1552
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 196
diff changeset
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 196
diff changeset
20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 196
diff changeset
21 * questions.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
22 *
a61af66fc99e Initial load
duke
parents:
diff changeset
23 */
a61af66fc99e Initial load
duke
parents:
diff changeset
24
1972
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1552
diff changeset
25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1552
diff changeset
26 #include "memory/gcLocker.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1552
diff changeset
27 #include "memory/resourceArea.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1552
diff changeset
28 #include "memory/sharedHeap.hpp"
0
a61af66fc99e Initial load
duke
parents:
diff changeset
29
a61af66fc99e Initial load
duke
parents:
diff changeset
30 volatile jint GC_locker::_jni_lock_count = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
31 volatile jint GC_locker::_lock_count = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
32 volatile bool GC_locker::_needs_gc = false;
a61af66fc99e Initial load
duke
parents:
diff changeset
33 volatile bool GC_locker::_doing_gc = false;
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
34 jlong GC_locker::_wait_begin = 0;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
35
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
36 #ifdef ASSERT
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
37 volatile jint GC_locker::_debug_jni_lock_count = 0;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
38 #endif
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
39
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
40
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
41 #ifdef ASSERT
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
42 void GC_locker::verify_critical_count() {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
43 if (SafepointSynchronize::is_at_safepoint()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
44 assert(!needs_gc() || _debug_jni_lock_count == _jni_lock_count, "must agree");
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
45 int count = 0;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
46 // Count the number of threads with critical operations in progress
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
47 for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
48 if (thr->in_critical()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
49 count++;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
50 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
51 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
52 if (_jni_lock_count != count) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
53 tty->print_cr("critical counts don't match: %d != %d", _jni_lock_count, count);
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
54 for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
55 if (thr->in_critical()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
56 tty->print_cr(INTPTR_FORMAT " in_critical %d", thr, thr->in_critical());
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
57 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
58 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
59 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
60 assert(_jni_lock_count == count, "must be equal");
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
61 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
62 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
63 #endif
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
64
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
65 bool GC_locker::check_active_before_gc() {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
66 assert(SafepointSynchronize::is_at_safepoint(), "only read at safepoint");
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
67 if (is_active() && !_needs_gc) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
68 verify_critical_count();
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
69 _needs_gc = true;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
70 if (PrintJNIGCStalls && PrintGCDetails) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
71 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
72 _wait_begin = tty->time_stamp().milliseconds();
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
73 gclog_or_tty->print_cr(INT64_FORMAT ": Setting _needs_gc. Thread \"%s\" %d locked.",
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
74 _wait_begin, Thread::current()->name(), _jni_lock_count);
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
75 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
76
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
77 }
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
78 return is_active();
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
79 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
80
a61af66fc99e Initial load
duke
parents:
diff changeset
81 void GC_locker::stall_until_clear() {
a61af66fc99e Initial load
duke
parents:
diff changeset
82 assert(!JavaThread::current()->in_critical(), "Would deadlock");
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
83 MutexLocker ml(JNICritical_lock);
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
84
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
85 if (needs_gc()) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
86 if (PrintJNIGCStalls && PrintGCDetails) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
87 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
88 gclog_or_tty->print_cr(INT64_FORMAT ": Allocation failed. Thread \"%s\" is stalled by JNI critical section, %d locked.",
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
89 tty->time_stamp().milliseconds() - _wait_begin, Thread::current()->name(), _jni_lock_count);
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
90 }
139
c0492d52d55b 6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents: 0
diff changeset
91 }
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
92
0
a61af66fc99e Initial load
duke
parents:
diff changeset
93 // Wait for _needs_gc to be cleared
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
94 while (needs_gc()) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
95 JNICritical_lock->wait();
a61af66fc99e Initial load
duke
parents:
diff changeset
96 }
a61af66fc99e Initial load
duke
parents:
diff changeset
97 }
a61af66fc99e Initial load
duke
parents:
diff changeset
98
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
99 void GC_locker::jni_lock(JavaThread* thread) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
100 assert(!thread->in_critical(), "shouldn't currently be in a critical region");
0
a61af66fc99e Initial load
duke
parents:
diff changeset
101 MutexLocker mu(JNICritical_lock);
a61af66fc99e Initial load
duke
parents:
diff changeset
102 // Block entering threads if we know at least one thread is in a
a61af66fc99e Initial load
duke
parents:
diff changeset
103 // JNI critical region and we need a GC.
a61af66fc99e Initial load
duke
parents:
diff changeset
104 // We check that at least one thread is in a critical region before
a61af66fc99e Initial load
duke
parents:
diff changeset
105 // blocking because blocked threads are woken up by a thread exiting
a61af66fc99e Initial load
duke
parents:
diff changeset
106 // a JNI critical region.
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
107 while ((needs_gc() && is_jni_active()) || _doing_gc) {
0
a61af66fc99e Initial load
duke
parents:
diff changeset
108 JNICritical_lock->wait();
a61af66fc99e Initial load
duke
parents:
diff changeset
109 }
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
110 thread->enter_critical();
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
111 _jni_lock_count++;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
112 increment_debug_jni_lock_count();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
113 }
a61af66fc99e Initial load
duke
parents:
diff changeset
114
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
115 void GC_locker::jni_unlock(JavaThread* thread) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
116 assert(thread->in_last_critical(), "should be exiting critical region");
0
a61af66fc99e Initial load
duke
parents:
diff changeset
117 MutexLocker mu(JNICritical_lock);
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
118 _jni_lock_count--;
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
119 decrement_debug_jni_lock_count();
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
120 thread->exit_critical();
0
a61af66fc99e Initial load
duke
parents:
diff changeset
121 if (needs_gc() && !is_jni_active()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
122 // We're the last thread out. Cause a GC to occur.
a61af66fc99e Initial load
duke
parents:
diff changeset
123 // GC will also check is_active, so this check is not
a61af66fc99e Initial load
duke
parents:
diff changeset
124 // strictly needed. It's added here to make it clear that
a61af66fc99e Initial load
duke
parents:
diff changeset
125 // the GC will NOT be performed if any other caller
a61af66fc99e Initial load
duke
parents:
diff changeset
126 // of GC_locker::lock() still needs GC locked.
a61af66fc99e Initial load
duke
parents:
diff changeset
127 if (!is_active()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
128 _doing_gc = true;
a61af66fc99e Initial load
duke
parents:
diff changeset
129 {
a61af66fc99e Initial load
duke
parents:
diff changeset
130 // Must give up the lock while at a safepoint
a61af66fc99e Initial load
duke
parents:
diff changeset
131 MutexUnlocker munlock(JNICritical_lock);
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
132 if (PrintJNIGCStalls && PrintGCDetails) {
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
133 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
134 gclog_or_tty->print_cr(INT64_FORMAT ": Thread \"%s\" is performing GC after exiting critical section, %d locked",
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
135 tty->time_stamp().milliseconds() - _wait_begin, Thread::current()->name(), _jni_lock_count);
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
136 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
137 Universe::heap()->collect(GCCause::_gc_locker);
a61af66fc99e Initial load
duke
parents:
diff changeset
138 }
a61af66fc99e Initial load
duke
parents:
diff changeset
139 _doing_gc = false;
a61af66fc99e Initial load
duke
parents:
diff changeset
140 }
4867
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
141
1a2723f7ad8e 7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents: 1972
diff changeset
142 _needs_gc = false;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
143 JNICritical_lock->notify_all();
a61af66fc99e Initial load
duke
parents:
diff changeset
144 }
a61af66fc99e Initial load
duke
parents:
diff changeset
145 }
a61af66fc99e Initial load
duke
parents:
diff changeset
146
a61af66fc99e Initial load
duke
parents:
diff changeset
147 // Implementation of No_GC_Verifier
a61af66fc99e Initial load
duke
parents:
diff changeset
148
a61af66fc99e Initial load
duke
parents:
diff changeset
149 #ifdef ASSERT
a61af66fc99e Initial load
duke
parents:
diff changeset
150
a61af66fc99e Initial load
duke
parents:
diff changeset
151 No_GC_Verifier::No_GC_Verifier(bool verifygc) {
a61af66fc99e Initial load
duke
parents:
diff changeset
152 _verifygc = verifygc;
a61af66fc99e Initial load
duke
parents:
diff changeset
153 if (_verifygc) {
a61af66fc99e Initial load
duke
parents:
diff changeset
154 CollectedHeap* h = Universe::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
155 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
a61af66fc99e Initial load
duke
parents:
diff changeset
156 _old_invocations = h->total_collections();
a61af66fc99e Initial load
duke
parents:
diff changeset
157 }
a61af66fc99e Initial load
duke
parents:
diff changeset
158 }
a61af66fc99e Initial load
duke
parents:
diff changeset
159
a61af66fc99e Initial load
duke
parents:
diff changeset
160
a61af66fc99e Initial load
duke
parents:
diff changeset
161 No_GC_Verifier::~No_GC_Verifier() {
a61af66fc99e Initial load
duke
parents:
diff changeset
162 if (_verifygc) {
a61af66fc99e Initial load
duke
parents:
diff changeset
163 CollectedHeap* h = Universe::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
164 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
a61af66fc99e Initial load
duke
parents:
diff changeset
165 if (_old_invocations != h->total_collections()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
166 fatal("collection in a No_GC_Verifier secured function");
a61af66fc99e Initial load
duke
parents:
diff changeset
167 }
a61af66fc99e Initial load
duke
parents:
diff changeset
168 }
a61af66fc99e Initial load
duke
parents:
diff changeset
169 }
a61af66fc99e Initial load
duke
parents:
diff changeset
170
a61af66fc99e Initial load
duke
parents:
diff changeset
171 Pause_No_GC_Verifier::Pause_No_GC_Verifier(No_GC_Verifier * ngcv) {
a61af66fc99e Initial load
duke
parents:
diff changeset
172 _ngcv = ngcv;
a61af66fc99e Initial load
duke
parents:
diff changeset
173 if (_ngcv->_verifygc) {
a61af66fc99e Initial load
duke
parents:
diff changeset
174 // if we were verifying, then make sure that nothing is
a61af66fc99e Initial load
duke
parents:
diff changeset
175 // wrong before we "pause" verification
a61af66fc99e Initial load
duke
parents:
diff changeset
176 CollectedHeap* h = Universe::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
177 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
a61af66fc99e Initial load
duke
parents:
diff changeset
178 if (_ngcv->_old_invocations != h->total_collections()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
179 fatal("collection in a No_GC_Verifier secured function");
a61af66fc99e Initial load
duke
parents:
diff changeset
180 }
a61af66fc99e Initial load
duke
parents:
diff changeset
181 }
a61af66fc99e Initial load
duke
parents:
diff changeset
182 }
a61af66fc99e Initial load
duke
parents:
diff changeset
183
a61af66fc99e Initial load
duke
parents:
diff changeset
184
a61af66fc99e Initial load
duke
parents:
diff changeset
185 Pause_No_GC_Verifier::~Pause_No_GC_Verifier() {
a61af66fc99e Initial load
duke
parents:
diff changeset
186 if (_ngcv->_verifygc) {
a61af66fc99e Initial load
duke
parents:
diff changeset
187 // if we were verifying before, then reenable verification
a61af66fc99e Initial load
duke
parents:
diff changeset
188 CollectedHeap* h = Universe::heap();
a61af66fc99e Initial load
duke
parents:
diff changeset
189 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
a61af66fc99e Initial load
duke
parents:
diff changeset
190 _ngcv->_old_invocations = h->total_collections();
a61af66fc99e Initial load
duke
parents:
diff changeset
191 }
a61af66fc99e Initial load
duke
parents:
diff changeset
192 }
a61af66fc99e Initial load
duke
parents:
diff changeset
193
a61af66fc99e Initial load
duke
parents:
diff changeset
194
a61af66fc99e Initial load
duke
parents:
diff changeset
195 // JRT_LEAF rules:
a61af66fc99e Initial load
duke
parents:
diff changeset
196 // A JRT_LEAF method may not interfere with safepointing by
a61af66fc99e Initial load
duke
parents:
diff changeset
197 // 1) acquiring or blocking on a Mutex or JavaLock - checked
a61af66fc99e Initial load
duke
parents:
diff changeset
198 // 2) allocating heap memory - checked
a61af66fc99e Initial load
duke
parents:
diff changeset
199 // 3) executing a VM operation - checked
a61af66fc99e Initial load
duke
parents:
diff changeset
200 // 4) executing a system call (including malloc) that could block or grab a lock
a61af66fc99e Initial load
duke
parents:
diff changeset
201 // 5) invoking GC
a61af66fc99e Initial load
duke
parents:
diff changeset
202 // 6) reaching a safepoint
a61af66fc99e Initial load
duke
parents:
diff changeset
203 // 7) running too long
a61af66fc99e Initial load
duke
parents:
diff changeset
204 // Nor may any method it calls.
a61af66fc99e Initial load
duke
parents:
diff changeset
205 JRT_Leaf_Verifier::JRT_Leaf_Verifier()
a61af66fc99e Initial load
duke
parents:
diff changeset
206 : No_Safepoint_Verifier(true, JRT_Leaf_Verifier::should_verify_GC())
a61af66fc99e Initial load
duke
parents:
diff changeset
207 {
a61af66fc99e Initial load
duke
parents:
diff changeset
208 }
a61af66fc99e Initial load
duke
parents:
diff changeset
209
a61af66fc99e Initial load
duke
parents:
diff changeset
210 JRT_Leaf_Verifier::~JRT_Leaf_Verifier()
a61af66fc99e Initial load
duke
parents:
diff changeset
211 {
a61af66fc99e Initial load
duke
parents:
diff changeset
212 }
a61af66fc99e Initial load
duke
parents:
diff changeset
213
a61af66fc99e Initial load
duke
parents:
diff changeset
214 bool JRT_Leaf_Verifier::should_verify_GC() {
a61af66fc99e Initial load
duke
parents:
diff changeset
215 switch (JavaThread::current()->thread_state()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
216 case _thread_in_Java:
a61af66fc99e Initial load
duke
parents:
diff changeset
217 // is in a leaf routine, there must be no safepoint.
a61af66fc99e Initial load
duke
parents:
diff changeset
218 return true;
a61af66fc99e Initial load
duke
parents:
diff changeset
219 case _thread_in_native:
a61af66fc99e Initial load
duke
parents:
diff changeset
220 // A native thread is not subject to safepoints.
a61af66fc99e Initial load
duke
parents:
diff changeset
221 // Even while it is in a leaf routine, GC is ok
a61af66fc99e Initial load
duke
parents:
diff changeset
222 return false;
a61af66fc99e Initial load
duke
parents:
diff changeset
223 default:
a61af66fc99e Initial load
duke
parents:
diff changeset
224 // Leaf routines cannot be called from other contexts.
a61af66fc99e Initial load
duke
parents:
diff changeset
225 ShouldNotReachHere();
a61af66fc99e Initial load
duke
parents:
diff changeset
226 return false;
a61af66fc99e Initial load
duke
parents:
diff changeset
227 }
a61af66fc99e Initial load
duke
parents:
diff changeset
228 }
a61af66fc99e Initial load
duke
parents:
diff changeset
229 #endif