Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/gcLocker.hpp @ 4944:09d00c18e323
7145537: minor tweaks to LogEvents
Reviewed-by: kvn, twisti
author | never |
---|---|
date | Wed, 15 Feb 2012 10:12:55 -0800 |
parents | 0382d2b469b2 |
children | ad3b47344802 |
rev | line source |
---|---|
0 | 1 /* |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
844
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
844
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:
844
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_GCLOCKER_HPP |
26 #define SHARE_VM_MEMORY_GCLOCKER_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/genCollectedHeap.hpp" | |
30 #include "memory/universe.hpp" | |
31 #include "oops/oop.hpp" | |
32 #ifdef TARGET_OS_FAMILY_linux | |
33 # include "os_linux.inline.hpp" | |
34 # include "thread_linux.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_OS_FAMILY_solaris | |
37 # include "os_solaris.inline.hpp" | |
38 # include "thread_solaris.inline.hpp" | |
39 #endif | |
40 #ifdef TARGET_OS_FAMILY_windows | |
41 # include "os_windows.inline.hpp" | |
42 # include "thread_windows.inline.hpp" | |
43 #endif | |
3960 | 44 #ifdef TARGET_OS_FAMILY_bsd |
45 # include "os_bsd.inline.hpp" | |
46 # include "thread_bsd.inline.hpp" | |
47 #endif | |
1972 | 48 |
0 | 49 // The direct lock/unlock calls do not force a collection if an unlock |
50 // decrements the count to zero. Avoid calling these if at all possible. | |
51 | |
52 class GC_locker: public AllStatic { | |
53 private: | |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
54 // The _jni_lock_count keeps track of the number of threads that are |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
55 // currently in a critical region. It's only kept up to date when |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
56 // _needs_gc is true. The current value is computed during |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
57 // safepointing and decremented during the slow path of GC_locker |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
58 // unlocking. |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
59 static volatile jint _jni_lock_count; // number of jni active instances. |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
60 |
0 | 61 static volatile jint _lock_count; // number of other active instances |
62 static volatile bool _needs_gc; // heap is filling, we need a GC | |
63 // note: bool is typedef'd as jint | |
64 static volatile bool _doing_gc; // unlock_critical() is doing a GC | |
65 | |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
66 #ifdef ASSERT |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
67 // This lock count is updated for all operations and is used to |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
68 // validate the jni_lock_count that is computed during safepoints. |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
69 static volatile jint _debug_jni_lock_count; |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
70 #endif |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
71 |
0 | 72 // Accessors |
73 static bool is_jni_active() { | |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
74 assert(_needs_gc, "only valid when _needs_gc is set"); |
0 | 75 return _jni_lock_count > 0; |
76 } | |
77 | |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
78 // At a safepoint, visit all threads and count the number of active |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
79 // critical sections. This is used to ensure that all active |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
80 // critical sections are exited before a new one is started. |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
81 static void verify_critical_count() NOT_DEBUG_RETURN; |
0 | 82 |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
83 static void jni_lock(JavaThread* thread); |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
84 static void jni_unlock(JavaThread* thread); |
0 | 85 |
86 public: | |
87 // Accessors | |
88 static bool is_active(); | |
89 static bool needs_gc() { return _needs_gc; } | |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
90 |
0 | 91 // Shorthand |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
92 static bool is_active_and_needs_gc() { return needs_gc() && is_active(); } |
0 | 93 |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
94 // In debug mode track the locking state at all times |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
95 static void increment_debug_jni_lock_count() { |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
96 #ifdef ASSERT |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
97 assert(_debug_jni_lock_count >= 0, "bad value"); |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
98 Atomic::inc(&_debug_jni_lock_count); |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
99 #endif |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
100 } |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
101 static void decrement_debug_jni_lock_count() { |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
102 #ifdef ASSERT |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
103 assert(_debug_jni_lock_count > 0, "bad value"); |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
104 Atomic::dec(&_debug_jni_lock_count); |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
105 #endif |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
106 } |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
107 |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
108 // Set the current lock count |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
109 static void set_jni_lock_count(int count) { |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
110 _jni_lock_count = count; |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
111 verify_critical_count(); |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
112 } |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
113 |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
114 // Sets _needs_gc if is_active() is true. Returns is_active(). |
0 | 115 static bool check_active_before_gc(); |
116 | |
117 // Stalls the caller (who should not be in a jni critical section) | |
118 // until needs_gc() clears. Note however that needs_gc() may be | |
119 // set at a subsequent safepoint and/or cleared under the | |
120 // JNICritical_lock, so the caller may not safely assert upon | |
121 // return from this method that "!needs_gc()" since that is | |
122 // not a stable predicate. | |
123 static void stall_until_clear(); | |
124 | |
125 // Non-structured GC locking: currently needed for JNI. Use with care! | |
126 static void lock(); | |
127 static void unlock(); | |
128 | |
129 // The following two methods are used for JNI critical regions. | |
130 // If we find that we failed to perform a GC because the GC_locker | |
131 // was active, arrange for one as soon as possible by allowing | |
132 // all threads in critical regions to complete, but not allowing | |
133 // other critical regions to be entered. The reasons for that are: | |
134 // 1) a GC request won't be starved by overlapping JNI critical | |
135 // region activities, which can cause unnecessary OutOfMemory errors. | |
136 // 2) even if allocation requests can still be satisfied before GC locker | |
137 // becomes inactive, for example, in tenured generation possibly with | |
138 // heap expansion, those allocations can trigger lots of safepointing | |
139 // attempts (ineffective GC attempts) and require Heap_lock which | |
140 // slow down allocations tremendously. | |
141 // | |
142 // Note that critical regions can be nested in a single thread, so | |
143 // we must allow threads already in critical regions to continue. | |
144 // | |
145 // JNI critical regions are the only participants in this scheme | |
146 // because they are, by spec, well bounded while in a critical region. | |
147 // | |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
148 // Each of the following two method is split into a fast path and a |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
149 // slow path. JNICritical_lock is only grabbed in the slow path. |
0 | 150 // _needs_gc is initially false and every java thread will go |
4867
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
151 // through the fast path, which simply increments or decrements the |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
152 // current thread's critical count. When GC happens at a safepoint, |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
153 // GC_locker::is_active() is checked. Since there is no safepoint in |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
154 // the fast path of lock_critical() and unlock_critical(), there is |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
155 // no race condition between the fast path and GC. After _needs_gc |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
156 // is set at a safepoint, every thread will go through the slow path |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
157 // after the safepoint. Since after a safepoint, each of the |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
158 // following two methods is either entered from the method entry and |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
159 // falls into the slow path, or is resumed from the safepoints in |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
160 // the method, which only exist in the slow path. So when _needs_gc |
1a2723f7ad8e
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale
never
parents:
3960
diff
changeset
|
161 // is set, the slow path is always taken, till _needs_gc is cleared. |
0 | 162 static void lock_critical(JavaThread* thread); |
163 static void unlock_critical(JavaThread* thread); | |
4873
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4867
diff
changeset
|
164 |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4867
diff
changeset
|
165 static address needs_gc_address() { return (address) &_needs_gc; } |
0 | 166 }; |
167 | |
168 | |
169 // A No_GC_Verifier object can be placed in methods where one assumes that | |
170 // no garbage collection will occur. The destructor will verify this property | |
171 // unless the constructor is called with argument false (not verifygc). | |
172 // | |
173 // The check will only be done in debug mode and if verifygc true. | |
174 | |
175 class No_GC_Verifier: public StackObj { | |
176 friend class Pause_No_GC_Verifier; | |
177 | |
178 protected: | |
179 bool _verifygc; | |
180 unsigned int _old_invocations; | |
181 | |
182 public: | |
183 #ifdef ASSERT | |
184 No_GC_Verifier(bool verifygc = true); | |
185 ~No_GC_Verifier(); | |
186 #else | |
187 No_GC_Verifier(bool verifygc = true) {} | |
188 ~No_GC_Verifier() {} | |
189 #endif | |
190 }; | |
191 | |
192 // A Pause_No_GC_Verifier is used to temporarily pause the behavior | |
193 // of a No_GC_Verifier object. If we are not in debug mode or if the | |
194 // No_GC_Verifier object has a _verifygc value of false, then there | |
195 // is nothing to do. | |
196 | |
197 class Pause_No_GC_Verifier: public StackObj { | |
198 private: | |
199 No_GC_Verifier * _ngcv; | |
200 | |
201 public: | |
202 #ifdef ASSERT | |
203 Pause_No_GC_Verifier(No_GC_Verifier * ngcv); | |
204 ~Pause_No_GC_Verifier(); | |
205 #else | |
206 Pause_No_GC_Verifier(No_GC_Verifier * ngcv) {} | |
207 ~Pause_No_GC_Verifier() {} | |
208 #endif | |
209 }; | |
210 | |
211 | |
212 // A No_Safepoint_Verifier object will throw an assertion failure if | |
213 // the current thread passes a possible safepoint while this object is | |
214 // instantiated. A safepoint, will either be: an oop allocation, blocking | |
215 // on a Mutex or JavaLock, or executing a VM operation. | |
216 // | |
217 // If StrictSafepointChecks is turned off, it degrades into a No_GC_Verifier | |
218 // | |
219 class No_Safepoint_Verifier : public No_GC_Verifier { | |
220 friend class Pause_No_Safepoint_Verifier; | |
221 | |
222 private: | |
223 bool _activated; | |
224 Thread *_thread; | |
225 public: | |
226 #ifdef ASSERT | |
98
deb97b8ef02b
6679708: No_Safepoint_Verifier and BacktraceBuilder have uninitialized fields
never
parents:
0
diff
changeset
|
227 No_Safepoint_Verifier(bool activated = true, bool verifygc = true ) : |
deb97b8ef02b
6679708: No_Safepoint_Verifier and BacktraceBuilder have uninitialized fields
never
parents:
0
diff
changeset
|
228 No_GC_Verifier(verifygc), |
deb97b8ef02b
6679708: No_Safepoint_Verifier and BacktraceBuilder have uninitialized fields
never
parents:
0
diff
changeset
|
229 _activated(activated) { |
0 | 230 _thread = Thread::current(); |
231 if (_activated) { | |
232 _thread->_allow_allocation_count++; | |
233 _thread->_allow_safepoint_count++; | |
234 } | |
235 } | |
236 | |
237 ~No_Safepoint_Verifier() { | |
238 if (_activated) { | |
239 _thread->_allow_allocation_count--; | |
240 _thread->_allow_safepoint_count--; | |
241 } | |
242 } | |
243 #else | |
244 No_Safepoint_Verifier(bool activated = true, bool verifygc = true) : No_GC_Verifier(verifygc){} | |
245 ~No_Safepoint_Verifier() {} | |
246 #endif | |
247 }; | |
248 | |
249 // A Pause_No_Safepoint_Verifier is used to temporarily pause the | |
250 // behavior of a No_Safepoint_Verifier object. If we are not in debug | |
251 // mode then there is nothing to do. If the No_Safepoint_Verifier | |
252 // object has an _activated value of false, then there is nothing to | |
253 // do for safepoint and allocation checking, but there may still be | |
254 // something to do for the underlying No_GC_Verifier object. | |
255 | |
256 class Pause_No_Safepoint_Verifier : public Pause_No_GC_Verifier { | |
257 private: | |
258 No_Safepoint_Verifier * _nsv; | |
259 | |
260 public: | |
261 #ifdef ASSERT | |
262 Pause_No_Safepoint_Verifier(No_Safepoint_Verifier * nsv) | |
263 : Pause_No_GC_Verifier(nsv) { | |
264 | |
265 _nsv = nsv; | |
266 if (_nsv->_activated) { | |
267 _nsv->_thread->_allow_allocation_count--; | |
268 _nsv->_thread->_allow_safepoint_count--; | |
269 } | |
270 } | |
271 | |
272 ~Pause_No_Safepoint_Verifier() { | |
273 if (_nsv->_activated) { | |
274 _nsv->_thread->_allow_allocation_count++; | |
275 _nsv->_thread->_allow_safepoint_count++; | |
276 } | |
277 } | |
278 #else | |
279 Pause_No_Safepoint_Verifier(No_Safepoint_Verifier * nsv) | |
280 : Pause_No_GC_Verifier(nsv) {} | |
281 ~Pause_No_Safepoint_Verifier() {} | |
282 #endif | |
283 }; | |
284 | |
806
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
285 // A SkipGCALot object is used to elide the usual effect of gc-a-lot |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
286 // over a section of execution by a thread. Currently, it's used only to |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
287 // prevent re-entrant calls to GC. |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
288 class SkipGCALot : public StackObj { |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
289 private: |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
290 bool _saved; |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
291 Thread* _t; |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
292 |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
293 public: |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
294 #ifdef ASSERT |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
295 SkipGCALot(Thread* t) : _t(t) { |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
296 _saved = _t->skip_gcalot(); |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
297 _t->set_skip_gcalot(true); |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
298 } |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
299 |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
300 ~SkipGCALot() { |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
301 assert(_t->skip_gcalot(), "Save-restore protocol invariant"); |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
302 _t->set_skip_gcalot(_saved); |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
303 } |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
304 #else |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
305 SkipGCALot(Thread* t) { } |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
306 ~SkipGCALot() { } |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
307 #endif |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
308 }; |
821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
parents:
196
diff
changeset
|
309 |
0 | 310 // JRT_LEAF currently can be called from either _thread_in_Java or |
311 // _thread_in_native mode. In _thread_in_native, it is ok | |
312 // for another thread to trigger GC. The rest of the JRT_LEAF | |
313 // rules apply. | |
314 class JRT_Leaf_Verifier : public No_Safepoint_Verifier { | |
315 static bool should_verify_GC(); | |
316 public: | |
317 #ifdef ASSERT | |
318 JRT_Leaf_Verifier(); | |
319 ~JRT_Leaf_Verifier(); | |
320 #else | |
321 JRT_Leaf_Verifier() {} | |
322 ~JRT_Leaf_Verifier() {} | |
323 #endif | |
324 }; | |
325 | |
326 // A No_Alloc_Verifier object can be placed in methods where one assumes that | |
327 // no allocation will occur. The destructor will verify this property | |
328 // unless the constructor is called with argument false (not activated). | |
329 // | |
330 // The check will only be done in debug mode and if activated. | |
331 // Note: this only makes sense at safepoints (otherwise, other threads may | |
332 // allocate concurrently.) | |
333 | |
334 class No_Alloc_Verifier : public StackObj { | |
335 private: | |
336 bool _activated; | |
337 | |
338 public: | |
339 #ifdef ASSERT | |
340 No_Alloc_Verifier(bool activated = true) { | |
341 _activated = activated; | |
342 if (_activated) Thread::current()->_allow_allocation_count++; | |
343 } | |
344 | |
345 ~No_Alloc_Verifier() { | |
346 if (_activated) Thread::current()->_allow_allocation_count--; | |
347 } | |
348 #else | |
349 No_Alloc_Verifier(bool activated = true) {} | |
350 ~No_Alloc_Verifier() {} | |
351 #endif | |
352 }; | |
1972 | 353 |
354 #endif // SHARE_VM_MEMORY_GCLOCKER_HPP |