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authorJustin Clark-Casey (justincc)2012-12-07 00:47:04 +0000
committerJustin Clark-Casey (justincc)2012-12-07 00:47:04 +0000
commit0568c76a8801408665730702c97717d3c05cfe4d (patch)
tree9d52df990ff6b0b0f51430f1adc1bb7185ab41e1 /OpenSim
parentminor: change method doc on GetTextureHandler.TryParseRange(), mainly to trig... (diff)
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Use a thread abort safe version of OpenMetaverse.DoubleDictionary with the aim of avoiding OpenSimulator problems due to script thread aborts.
When an object is removed, its scripts are stopped and then the thread running them is aborted if stop takes too long. However, it appears that aborting a thread at just the wrong moment when it is obtaining a ReaderWriterLockSlim lock can leave this lock in an inconsistent state. One symptom of this is that mono leaps to 100% cpu and a vm thread dump reveals lots of threads waiting for a ReaderWriterLockSlim lock without any thread actually holding it. This is probably the same problem as encountered originally in commit 12cebb12 This commit looks to plaster this problem by putting lock obtaining methods inside finally blocks which should be uninterruptible by thread aborts.
Diffstat (limited to 'OpenSim')
-rw-r--r--OpenSim/Framework/DoubleDictionaryThreadAbortSafe.cs508
-rw-r--r--OpenSim/Region/Framework/Scenes/EntityManager.cs4
2 files changed, 511 insertions, 1 deletions
diff --git a/OpenSim/Framework/DoubleDictionaryThreadAbortSafe.cs b/OpenSim/Framework/DoubleDictionaryThreadAbortSafe.cs
new file mode 100644
index 0000000..9056548
--- /dev/null
+++ b/OpenSim/Framework/DoubleDictionaryThreadAbortSafe.cs
@@ -0,0 +1,508 @@
1/*
2 * Copyright (c) 2008, openmetaverse.org, http://opensimulator.org/
3 * All rights reserved.
4 *
5 * - Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * - Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 * - Neither the name of the openmetaverse.org nor the names
11 * of its contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 */
26
27using System;
28using System.Threading;
29using System.Collections.Generic;
30
31namespace OpenSim.Framework
32{
33 /// <summary>
34 /// A double dictionary that is thread abort safe.
35 /// </summary>
36 /// <remarks>
37 /// This adapts OpenMetaverse.DoubleDictionary to be thread-abort safe by acquiring ReaderWriterLockSlim within
38 /// a finally section (which can't be interrupted by Thread.Abort()).
39 /// </remarks>
40 public class DoubleDictionaryThreadAbortSafe<TKey1, TKey2, TValue>
41 {
42 Dictionary<TKey1, TValue> Dictionary1;
43 Dictionary<TKey2, TValue> Dictionary2;
44 ReaderWriterLockSlim rwLock = new ReaderWriterLockSlim();
45
46 public DoubleDictionaryThreadAbortSafe()
47 {
48 Dictionary1 = new Dictionary<TKey1,TValue>();
49 Dictionary2 = new Dictionary<TKey2,TValue>();
50 }
51
52 public DoubleDictionaryThreadAbortSafe(int capacity)
53 {
54 Dictionary1 = new Dictionary<TKey1, TValue>(capacity);
55 Dictionary2 = new Dictionary<TKey2, TValue>(capacity);
56 }
57
58 public void Add(TKey1 key1, TKey2 key2, TValue value)
59 {
60 bool gotLock = false;
61
62 try
63 {
64 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
65 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
66 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
67 try {}
68 finally
69 {
70 rwLock.EnterWriteLock();
71 gotLock = true;
72 }
73
74 if (Dictionary1.ContainsKey(key1))
75 {
76 if (!Dictionary2.ContainsKey(key2))
77 throw new ArgumentException("key1 exists in the dictionary but not key2");
78 }
79 else if (Dictionary2.ContainsKey(key2))
80 {
81 if (!Dictionary1.ContainsKey(key1))
82 throw new ArgumentException("key2 exists in the dictionary but not key1");
83 }
84
85 Dictionary1[key1] = value;
86 Dictionary2[key2] = value;
87 }
88 finally
89 {
90 if (gotLock)
91 rwLock.ExitWriteLock();
92 }
93 }
94
95 public bool Remove(TKey1 key1, TKey2 key2)
96 {
97 bool success;
98 bool gotLock = false;
99
100 try
101 {
102 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
103 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
104 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
105 try {}
106 finally
107 {
108 rwLock.EnterWriteLock();
109 gotLock = true;
110 }
111
112 Dictionary1.Remove(key1);
113 success = Dictionary2.Remove(key2);
114 }
115 finally
116 {
117 if (gotLock)
118 rwLock.ExitWriteLock();
119 }
120
121 return success;
122 }
123
124 public bool Remove(TKey1 key1)
125 {
126 bool found = false;
127 bool gotLock = false;
128
129 try
130 {
131 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
132 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
133 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
134 try {}
135 finally
136 {
137 rwLock.EnterWriteLock();
138 gotLock = true;
139 }
140
141 // This is an O(n) operation!
142 TValue value;
143 if (Dictionary1.TryGetValue(key1, out value))
144 {
145 foreach (KeyValuePair<TKey2, TValue> kvp in Dictionary2)
146 {
147 if (kvp.Value.Equals(value))
148 {
149 Dictionary1.Remove(key1);
150 Dictionary2.Remove(kvp.Key);
151 found = true;
152 break;
153 }
154 }
155 }
156 }
157 finally
158 {
159 if (gotLock)
160 rwLock.ExitWriteLock();
161 }
162
163 return found;
164 }
165
166 public bool Remove(TKey2 key2)
167 {
168 bool found = false;
169 bool gotLock = false;
170
171 try
172 {
173 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
174 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
175 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
176 try {}
177 finally
178 {
179 rwLock.EnterWriteLock();
180 gotLock = true;
181 }
182
183 // This is an O(n) operation!
184 TValue value;
185 if (Dictionary2.TryGetValue(key2, out value))
186 {
187 foreach (KeyValuePair<TKey1, TValue> kvp in Dictionary1)
188 {
189 if (kvp.Value.Equals(value))
190 {
191 Dictionary2.Remove(key2);
192 Dictionary1.Remove(kvp.Key);
193 found = true;
194 break;
195 }
196 }
197 }
198 }
199 finally
200 {
201 if (gotLock)
202 rwLock.ExitWriteLock();
203 }
204
205 return found;
206 }
207
208 public void Clear()
209 {
210 bool gotLock = false;
211
212 try
213 {
214 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
215 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
216 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
217 try {}
218 finally
219 {
220 rwLock.EnterWriteLock();
221 gotLock = true;
222 }
223
224 Dictionary1.Clear();
225 Dictionary2.Clear();
226 }
227 finally
228 {
229 if (gotLock)
230 rwLock.ExitWriteLock();
231 }
232 }
233
234 public int Count
235 {
236 get { return Dictionary1.Count; }
237 }
238
239 public bool ContainsKey(TKey1 key)
240 {
241 return Dictionary1.ContainsKey(key);
242 }
243
244 public bool ContainsKey(TKey2 key)
245 {
246 return Dictionary2.ContainsKey(key);
247 }
248
249 public bool TryGetValue(TKey1 key, out TValue value)
250 {
251 bool success;
252 bool gotLock = false;
253
254 try
255 {
256 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
257 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
258 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
259 try {}
260 finally
261 {
262 rwLock.EnterReadLock();
263 gotLock = true;
264 }
265
266 success = Dictionary1.TryGetValue(key, out value);
267 }
268 finally
269 {
270 if (gotLock)
271 rwLock.ExitReadLock();
272 }
273
274 return success;
275 }
276
277 public bool TryGetValue(TKey2 key, out TValue value)
278 {
279 bool success;
280 bool gotLock = false;
281
282 try
283 {
284 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
285 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
286 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
287 try {}
288 finally
289 {
290 rwLock.EnterReadLock();
291 gotLock = true;
292 }
293
294 success = Dictionary2.TryGetValue(key, out value);
295 }
296 finally
297 {
298 if (gotLock)
299 rwLock.ExitReadLock();
300 }
301
302 return success;
303 }
304
305 public void ForEach(Action<TValue> action)
306 {
307 bool gotLock = false;
308
309 try
310 {
311 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
312 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
313 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
314 try {}
315 finally
316 {
317 rwLock.EnterReadLock();
318 gotLock = true;
319 }
320
321 foreach (TValue value in Dictionary1.Values)
322 action(value);
323 }
324 finally
325 {
326 if (gotLock)
327 rwLock.ExitReadLock();
328 }
329 }
330
331 public void ForEach(Action<KeyValuePair<TKey1, TValue>> action)
332 {
333 bool gotLock = false;
334
335 try
336 {
337 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
338 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
339 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
340 try {}
341 finally
342 {
343 rwLock.EnterReadLock();
344 gotLock = true;
345 }
346
347 foreach (KeyValuePair<TKey1, TValue> entry in Dictionary1)
348 action(entry);
349 }
350 finally
351 {
352 if (gotLock)
353 rwLock.ExitReadLock();
354 }
355 }
356
357 public void ForEach(Action<KeyValuePair<TKey2, TValue>> action)
358 {
359 bool gotLock = false;
360
361 try
362 {
363 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
364 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
365 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
366 try {}
367 finally
368 {
369 rwLock.EnterReadLock();
370 gotLock = true;
371 }
372
373 foreach (KeyValuePair<TKey2, TValue> entry in Dictionary2)
374 action(entry);
375 }
376 finally
377 {
378 if (gotLock)
379 rwLock.ExitReadLock();
380 }
381 }
382
383 public TValue FindValue(Predicate<TValue> predicate)
384 {
385 bool gotLock = false;
386
387 try
388 {
389 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
390 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
391 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
392 try {}
393 finally
394 {
395 rwLock.EnterReadLock();
396 gotLock = true;
397 }
398
399 foreach (TValue value in Dictionary1.Values)
400 {
401 if (predicate(value))
402 return value;
403 }
404 }
405 finally
406 {
407 if (gotLock)
408 rwLock.ExitReadLock();
409 }
410
411 return default(TValue);
412 }
413
414 public IList<TValue> FindAll(Predicate<TValue> predicate)
415 {
416 IList<TValue> list = new List<TValue>();
417 bool gotLock = false;
418
419 try
420 {
421 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
422 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
423 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
424 try {}
425 finally
426 {
427 rwLock.EnterReadLock();
428 gotLock = true;
429 }
430
431 foreach (TValue value in Dictionary1.Values)
432 {
433 if (predicate(value))
434 list.Add(value);
435 }
436 }
437 finally
438 {
439 if (gotLock)
440 rwLock.ExitReadLock();
441 }
442
443 return list;
444 }
445
446 public int RemoveAll(Predicate<TValue> predicate)
447 {
448 IList<TKey1> list = new List<TKey1>();
449 bool gotUpgradeableLock = false;
450
451 try
452 {
453 // Avoid an asynchronous Thread.Abort() from possibly never existing an acquired lock by placing
454 // the acquision inside the main try. The inner finally block is needed because thread aborts cannot
455 // interrupt code in these blocks (hence gotLock is guaranteed to be set correctly).
456 try {}
457 finally
458 {
459 rwLock.EnterUpgradeableReadLock();
460 gotUpgradeableLock = true;
461 }
462
463 foreach (KeyValuePair<TKey1, TValue> kvp in Dictionary1)
464 {
465 if (predicate(kvp.Value))
466 list.Add(kvp.Key);
467 }
468
469 IList<TKey2> list2 = new List<TKey2>(list.Count);
470 foreach (KeyValuePair<TKey2, TValue> kvp in Dictionary2)
471 {
472 if (predicate(kvp.Value))
473 list2.Add(kvp.Key);
474 }
475
476 bool gotWriteLock = false;
477
478 try
479 {
480 try {}
481 finally
482 {
483 rwLock.EnterUpgradeableReadLock();
484 gotWriteLock = true;
485 }
486
487 for (int i = 0; i < list.Count; i++)
488 Dictionary1.Remove(list[i]);
489
490 for (int i = 0; i < list2.Count; i++)
491 Dictionary2.Remove(list2[i]);
492 }
493 finally
494 {
495 if (gotWriteLock)
496 rwLock.ExitWriteLock();
497 }
498 }
499 finally
500 {
501 if (gotUpgradeableLock)
502 rwLock.ExitUpgradeableReadLock();
503 }
504
505 return list.Count;
506 }
507 }
508} \ No newline at end of file
diff --git a/OpenSim/Region/Framework/Scenes/EntityManager.cs b/OpenSim/Region/Framework/Scenes/EntityManager.cs
index b788a3c..7181313 100644
--- a/OpenSim/Region/Framework/Scenes/EntityManager.cs
+++ b/OpenSim/Region/Framework/Scenes/EntityManager.cs
@@ -31,6 +31,7 @@ using System.Collections.Generic;
31using System.Reflection; 31using System.Reflection;
32using log4net; 32using log4net;
33using OpenMetaverse; 33using OpenMetaverse;
34using OpenSim.Framework;
34 35
35namespace OpenSim.Region.Framework.Scenes 36namespace OpenSim.Region.Framework.Scenes
36{ 37{
@@ -38,7 +39,8 @@ namespace OpenSim.Region.Framework.Scenes
38 { 39 {
39// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); 40// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
40 41
41 private readonly DoubleDictionary<UUID, uint, EntityBase> m_entities = new DoubleDictionary<UUID, uint, EntityBase>(); 42 private readonly DoubleDictionaryThreadAbortSafe<UUID, uint, EntityBase> m_entities
43 = new DoubleDictionaryThreadAbortSafe<UUID, uint, EntityBase>();
42 44
43 public int Count 45 public int Count
44 { 46 {