Mercurial > hg > truffle
annotate src/share/vm/memory/gcLocker.hpp @ 4939:45a1bf98f1bb
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Reviewed-by: kvn, never
author | twisti |
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date | Mon, 13 Feb 2012 02:29:22 -0800 |
parents | 0382d2b469b2 |
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0 | 1 /* |
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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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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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: | |
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54 // The _jni_lock_count keeps track of the number of threads that are |
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55 // currently in a critical region. It's only kept up to date when |
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56 // _needs_gc is true. The current value is computed during |
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57 // safepointing and decremented during the slow path of GC_locker |
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58 // unlocking. |
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59 static volatile jint _jni_lock_count; // number of jni active instances. |
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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 | |
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66 static jlong _wait_begin; // Timestamp for the setting of _needs_gc. |
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67 // Used only by printing code. |
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68 |
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69 #ifdef ASSERT |
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70 // This lock count is updated for all operations and is used to |
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71 // validate the jni_lock_count that is computed during safepoints. |
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72 static volatile jint _debug_jni_lock_count; |
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73 #endif |
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74 |
0 | 75 // Accessors |
76 static bool is_jni_active() { | |
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77 assert(_needs_gc, "only valid when _needs_gc is set"); |
0 | 78 return _jni_lock_count > 0; |
79 } | |
80 | |
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81 // At a safepoint, visit all threads and count the number of active |
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82 // critical sections. This is used to ensure that all active |
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83 // critical sections are exited before a new one is started. |
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84 static void verify_critical_count() NOT_DEBUG_RETURN; |
0 | 85 |
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86 static void jni_lock(JavaThread* thread); |
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87 static void jni_unlock(JavaThread* thread); |
0 | 88 |
89 public: | |
90 // Accessors | |
91 static bool is_active(); | |
92 static bool needs_gc() { return _needs_gc; } | |
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93 |
0 | 94 // Shorthand |
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95 static bool is_active_and_needs_gc() { return needs_gc() && is_active(); } |
0 | 96 |
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97 // In debug mode track the locking state at all times |
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98 static void increment_debug_jni_lock_count() { |
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99 #ifdef ASSERT |
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100 assert(_debug_jni_lock_count >= 0, "bad value"); |
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101 Atomic::inc(&_debug_jni_lock_count); |
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102 #endif |
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103 } |
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104 static void decrement_debug_jni_lock_count() { |
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105 #ifdef ASSERT |
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106 assert(_debug_jni_lock_count > 0, "bad value"); |
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107 Atomic::dec(&_debug_jni_lock_count); |
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108 #endif |
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109 } |
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110 |
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111 // Set the current lock count |
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112 static void set_jni_lock_count(int count) { |
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113 _jni_lock_count = count; |
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114 verify_critical_count(); |
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115 } |
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116 |
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117 // Sets _needs_gc if is_active() is true. Returns is_active(). |
0 | 118 static bool check_active_before_gc(); |
119 | |
120 // Stalls the caller (who should not be in a jni critical section) | |
121 // until needs_gc() clears. Note however that needs_gc() may be | |
122 // set at a subsequent safepoint and/or cleared under the | |
123 // JNICritical_lock, so the caller may not safely assert upon | |
124 // return from this method that "!needs_gc()" since that is | |
125 // not a stable predicate. | |
126 static void stall_until_clear(); | |
127 | |
128 // Non-structured GC locking: currently needed for JNI. Use with care! | |
129 static void lock(); | |
130 static void unlock(); | |
131 | |
132 // The following two methods are used for JNI critical regions. | |
133 // If we find that we failed to perform a GC because the GC_locker | |
134 // was active, arrange for one as soon as possible by allowing | |
135 // all threads in critical regions to complete, but not allowing | |
136 // other critical regions to be entered. The reasons for that are: | |
137 // 1) a GC request won't be starved by overlapping JNI critical | |
138 // region activities, which can cause unnecessary OutOfMemory errors. | |
139 // 2) even if allocation requests can still be satisfied before GC locker | |
140 // becomes inactive, for example, in tenured generation possibly with | |
141 // heap expansion, those allocations can trigger lots of safepointing | |
142 // attempts (ineffective GC attempts) and require Heap_lock which | |
143 // slow down allocations tremendously. | |
144 // | |
145 // Note that critical regions can be nested in a single thread, so | |
146 // we must allow threads already in critical regions to continue. | |
147 // | |
148 // JNI critical regions are the only participants in this scheme | |
149 // because they are, by spec, well bounded while in a critical region. | |
150 // | |
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151 // Each of the following two method is split into a fast path and a |
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152 // slow path. JNICritical_lock is only grabbed in the slow path. |
0 | 153 // _needs_gc is initially false and every java thread will go |
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154 // through the fast path, which simply increments or decrements the |
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155 // current thread's critical count. When GC happens at a safepoint, |
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156 // GC_locker::is_active() is checked. Since there is no safepoint in |
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157 // the fast path of lock_critical() and unlock_critical(), there is |
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158 // no race condition between the fast path and GC. After _needs_gc |
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159 // is set at a safepoint, every thread will go through the slow path |
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160 // after the safepoint. Since after a safepoint, each of the |
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161 // following two methods is either entered from the method entry and |
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162 // falls into the slow path, or is resumed from the safepoints in |
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163 // the method, which only exist in the slow path. So when _needs_gc |
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164 // is set, the slow path is always taken, till _needs_gc is cleared. |
0 | 165 static void lock_critical(JavaThread* thread); |
166 static void unlock_critical(JavaThread* thread); | |
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167 |
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168 static address needs_gc_address() { return (address) &_needs_gc; } |
0 | 169 }; |
170 | |
171 | |
172 // A No_GC_Verifier object can be placed in methods where one assumes that | |
173 // no garbage collection will occur. The destructor will verify this property | |
174 // unless the constructor is called with argument false (not verifygc). | |
175 // | |
176 // The check will only be done in debug mode and if verifygc true. | |
177 | |
178 class No_GC_Verifier: public StackObj { | |
179 friend class Pause_No_GC_Verifier; | |
180 | |
181 protected: | |
182 bool _verifygc; | |
183 unsigned int _old_invocations; | |
184 | |
185 public: | |
186 #ifdef ASSERT | |
187 No_GC_Verifier(bool verifygc = true); | |
188 ~No_GC_Verifier(); | |
189 #else | |
190 No_GC_Verifier(bool verifygc = true) {} | |
191 ~No_GC_Verifier() {} | |
192 #endif | |
193 }; | |
194 | |
195 // A Pause_No_GC_Verifier is used to temporarily pause the behavior | |
196 // of a No_GC_Verifier object. If we are not in debug mode or if the | |
197 // No_GC_Verifier object has a _verifygc value of false, then there | |
198 // is nothing to do. | |
199 | |
200 class Pause_No_GC_Verifier: public StackObj { | |
201 private: | |
202 No_GC_Verifier * _ngcv; | |
203 | |
204 public: | |
205 #ifdef ASSERT | |
206 Pause_No_GC_Verifier(No_GC_Verifier * ngcv); | |
207 ~Pause_No_GC_Verifier(); | |
208 #else | |
209 Pause_No_GC_Verifier(No_GC_Verifier * ngcv) {} | |
210 ~Pause_No_GC_Verifier() {} | |
211 #endif | |
212 }; | |
213 | |
214 | |
215 // A No_Safepoint_Verifier object will throw an assertion failure if | |
216 // the current thread passes a possible safepoint while this object is | |
217 // instantiated. A safepoint, will either be: an oop allocation, blocking | |
218 // on a Mutex or JavaLock, or executing a VM operation. | |
219 // | |
220 // If StrictSafepointChecks is turned off, it degrades into a No_GC_Verifier | |
221 // | |
222 class No_Safepoint_Verifier : public No_GC_Verifier { | |
223 friend class Pause_No_Safepoint_Verifier; | |
224 | |
225 private: | |
226 bool _activated; | |
227 Thread *_thread; | |
228 public: | |
229 #ifdef ASSERT | |
98
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230 No_Safepoint_Verifier(bool activated = true, bool verifygc = true ) : |
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231 No_GC_Verifier(verifygc), |
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232 _activated(activated) { |
0 | 233 _thread = Thread::current(); |
234 if (_activated) { | |
235 _thread->_allow_allocation_count++; | |
236 _thread->_allow_safepoint_count++; | |
237 } | |
238 } | |
239 | |
240 ~No_Safepoint_Verifier() { | |
241 if (_activated) { | |
242 _thread->_allow_allocation_count--; | |
243 _thread->_allow_safepoint_count--; | |
244 } | |
245 } | |
246 #else | |
247 No_Safepoint_Verifier(bool activated = true, bool verifygc = true) : No_GC_Verifier(verifygc){} | |
248 ~No_Safepoint_Verifier() {} | |
249 #endif | |
250 }; | |
251 | |
252 // A Pause_No_Safepoint_Verifier is used to temporarily pause the | |
253 // behavior of a No_Safepoint_Verifier object. If we are not in debug | |
254 // mode then there is nothing to do. If the No_Safepoint_Verifier | |
255 // object has an _activated value of false, then there is nothing to | |
256 // do for safepoint and allocation checking, but there may still be | |
257 // something to do for the underlying No_GC_Verifier object. | |
258 | |
259 class Pause_No_Safepoint_Verifier : public Pause_No_GC_Verifier { | |
260 private: | |
261 No_Safepoint_Verifier * _nsv; | |
262 | |
263 public: | |
264 #ifdef ASSERT | |
265 Pause_No_Safepoint_Verifier(No_Safepoint_Verifier * nsv) | |
266 : Pause_No_GC_Verifier(nsv) { | |
267 | |
268 _nsv = nsv; | |
269 if (_nsv->_activated) { | |
270 _nsv->_thread->_allow_allocation_count--; | |
271 _nsv->_thread->_allow_safepoint_count--; | |
272 } | |
273 } | |
274 | |
275 ~Pause_No_Safepoint_Verifier() { | |
276 if (_nsv->_activated) { | |
277 _nsv->_thread->_allow_allocation_count++; | |
278 _nsv->_thread->_allow_safepoint_count++; | |
279 } | |
280 } | |
281 #else | |
282 Pause_No_Safepoint_Verifier(No_Safepoint_Verifier * nsv) | |
283 : Pause_No_GC_Verifier(nsv) {} | |
284 ~Pause_No_Safepoint_Verifier() {} | |
285 #endif | |
286 }; | |
287 | |
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288 // A SkipGCALot object is used to elide the usual effect of gc-a-lot |
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289 // over a section of execution by a thread. Currently, it's used only to |
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290 // prevent re-entrant calls to GC. |
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291 class SkipGCALot : public StackObj { |
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292 private: |
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293 bool _saved; |
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294 Thread* _t; |
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295 |
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296 public: |
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297 #ifdef ASSERT |
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298 SkipGCALot(Thread* t) : _t(t) { |
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299 _saved = _t->skip_gcalot(); |
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300 _t->set_skip_gcalot(true); |
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301 } |
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302 |
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303 ~SkipGCALot() { |
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304 assert(_t->skip_gcalot(), "Save-restore protocol invariant"); |
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305 _t->set_skip_gcalot(_saved); |
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306 } |
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307 #else |
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308 SkipGCALot(Thread* t) { } |
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309 ~SkipGCALot() { } |
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310 #endif |
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311 }; |
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312 |
0 | 313 // JRT_LEAF currently can be called from either _thread_in_Java or |
314 // _thread_in_native mode. In _thread_in_native, it is ok | |
315 // for another thread to trigger GC. The rest of the JRT_LEAF | |
316 // rules apply. | |
317 class JRT_Leaf_Verifier : public No_Safepoint_Verifier { | |
318 static bool should_verify_GC(); | |
319 public: | |
320 #ifdef ASSERT | |
321 JRT_Leaf_Verifier(); | |
322 ~JRT_Leaf_Verifier(); | |
323 #else | |
324 JRT_Leaf_Verifier() {} | |
325 ~JRT_Leaf_Verifier() {} | |
326 #endif | |
327 }; | |
328 | |
329 // A No_Alloc_Verifier object can be placed in methods where one assumes that | |
330 // no allocation will occur. The destructor will verify this property | |
331 // unless the constructor is called with argument false (not activated). | |
332 // | |
333 // The check will only be done in debug mode and if activated. | |
334 // Note: this only makes sense at safepoints (otherwise, other threads may | |
335 // allocate concurrently.) | |
336 | |
337 class No_Alloc_Verifier : public StackObj { | |
338 private: | |
339 bool _activated; | |
340 | |
341 public: | |
342 #ifdef ASSERT | |
343 No_Alloc_Verifier(bool activated = true) { | |
344 _activated = activated; | |
345 if (_activated) Thread::current()->_allow_allocation_count++; | |
346 } | |
347 | |
348 ~No_Alloc_Verifier() { | |
349 if (_activated) Thread::current()->_allow_allocation_count--; | |
350 } | |
351 #else | |
352 No_Alloc_Verifier(bool activated = true) {} | |
353 ~No_Alloc_Verifier() {} | |
354 #endif | |
355 }; | |
1972 | 356 |
357 #endif // SHARE_VM_MEMORY_GCLOCKER_HPP |