1 mike 1.2 //%/////////////////////////////////////////////////////////////////////////////
2 //
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3 kumpf 1.17 // Copyright (c) 2000, 2001, 2002 BMC Software, Hewlett-Packard Company, IBM,
4 // The Open Group, Tivoli Systems
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5 mike 1.2 //
6 // Permission is hereby granted, free of charge, to any person obtaining a copy
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7 chip 1.11 // of this software and associated documentation files (the "Software"), to
8 // deal in the Software without restriction, including without limitation the
9 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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10 mike 1.2 // sell copies of the Software, and to permit persons to whom the Software is
11 // furnished to do so, subject to the following conditions:
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12 kumpf 1.17 //
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13 chip 1.11 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
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14 mike 1.2 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
15 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
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16 chip 1.11 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
17 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
18 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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19 mike 1.2 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 //
22 //==============================================================================
23 //
24 // Author: Mike Day (mdday@us.ibm.com)
25 //
26 // Modified By: Rudy Schuet (rudy.schuet@compaq.com) 11/12/01
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27 chip 1.11 // added nsk platform support
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28 mike 1.2 //
29 //%/////////////////////////////////////////////////////////////////////////////
30
31 #include "Thread.h"
32 #include <Pegasus/Common/IPC.h>
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33 kumpf 1.14 #include <Pegasus/Common/Tracer.h>
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34 mike 1.2
35 #if defined(PEGASUS_OS_TYPE_WINDOWS)
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36 chip 1.11 # include "ThreadWindows.cpp"
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37 mike 1.2 #elif defined(PEGASUS_OS_TYPE_UNIX)
38 # include "ThreadUnix.cpp"
39 #elif defined(PEGASUS_OS_TYPE_NSK)
40 # include "ThreadNsk.cpp"
41 #else
42 # error "Unsupported platform"
43 #endif
44
45 PEGASUS_NAMESPACE_BEGIN
46
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47 mday 1.42
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48 chip 1.11 void thread_data::default_delete(void * data)
49 {
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50 mike 1.2 if( data != NULL)
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51 chip 1.11 ::operator delete(data);
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52 mike 1.2 }
53
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54 chuck 1.43 // l10n start
55 void language_delete(void * data)
56 {
57 if( data != NULL)
58 {
59 AcceptLanguages * al = static_cast<AcceptLanguages *>(data);
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60 chuck 1.44 delete al;
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61 chuck 1.43 }
62 }
63 // l10n end
64
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65 mike 1.2 Boolean Thread::_signals_blocked = false;
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66 chuck 1.37 // l10n
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67 mday 1.48 PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key = -1;
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68 chuck 1.37 Boolean Thread::_key_initialized = false;
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69 chuck 1.41 Boolean Thread::_key_error = false;
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70 chuck 1.37
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71 mike 1.2
72 // for non-native implementations
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73 chip 1.11 #ifndef PEGASUS_THREAD_CLEANUP_NATIVE
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74 mike 1.2 void Thread::cleanup_push( void (*routine)(void *), void *parm) throw(IPCException)
75 {
76 cleanup_handler *cu = new cleanup_handler(routine, parm);
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77 chip 1.11 try
78 {
79 _cleanup.insert_first(cu);
80 }
81 catch(IPCException&)
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82 mike 1.2 {
83 delete cu;
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84 chip 1.11 throw;
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85 mike 1.2 }
86 return;
87 }
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88 chip 1.11
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89 mike 1.2 void Thread::cleanup_pop(Boolean execute) throw(IPCException)
90 {
91 cleanup_handler *cu ;
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92 chip 1.11 try
93 {
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94 mike 1.2 cu = _cleanup.remove_first() ;
95 }
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96 chip 1.11 catch(IPCException&)
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97 mike 1.2 {
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98 chip 1.11 PEGASUS_ASSERT(0);
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99 mike 1.2 }
100 if(execute == true)
101 cu->execute();
102 delete cu;
103 }
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104 chip 1.11
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105 mike 1.2 #endif
106
107
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108 kumpf 1.8 //thread_data *Thread::put_tsd(const Sint8 *key, void (*delete_func)(void *), Uint32 size, void *value) throw(IPCException)
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109 mike 1.2
110
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111 chip 1.11 #ifndef PEGASUS_THREAD_EXIT_NATIVE
112 void Thread::exit_self(PEGASUS_THREAD_RETURN exit_code)
113 {
114 // execute the cleanup stack and then return
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115 mike 1.2 while( _cleanup.count() )
116 {
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117 chip 1.11 try
118 {
119 cleanup_pop(true);
120 }
121 catch(IPCException&)
122 {
123 PEGASUS_ASSERT(0);
124 break;
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125 mike 1.2 }
126 }
127 _exit_code = exit_code;
128 exit_thread(exit_code);
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129 mday 1.4 _handle.thid = 0;
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130 mike 1.2 }
131
132
133 #endif
134
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135 chuck 1.37 // l10n start
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136 chuck 1.39 Sint8 Thread::initializeKey()
137 {
138 PEG_METHOD_ENTER(TRC_THREAD, "Thread::initializeKey");
139 if (!Thread::_key_initialized)
140 {
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141 chuck 1.41 if (Thread::_key_error)
142 {
143 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
144 "Thread: ERROR - thread key error");
145 return -1;
146 }
147
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148 chuck 1.39 if (pegasus_key_create(&Thread::_platform_thread_key) == 0)
149 {
150 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
151 "Thread: able to create a thread key");
152 Thread::_key_initialized = true;
153 }
154 else
155 {
156 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
157 "Thread: ERROR - unable to create a thread key");
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158 chuck 1.41 Thread::_key_error = true;
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159 chuck 1.39 return -1;
160 }
161 }
162
163 PEG_METHOD_EXIT();
164 return 0;
165 }
166
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167 chuck 1.37 Thread * Thread::getCurrent()
168 {
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169 chuck 1.39 PEG_METHOD_ENTER(TRC_THREAD, "Thread::getCurrent");
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170 chuck 1.40 if (Thread::initializeKey() != 0)
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171 chuck 1.39 {
172 return NULL;
173 }
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174 chuck 1.38 PEG_METHOD_EXIT();
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175 chuck 1.39 return (Thread *)pegasus_get_thread_specific(_platform_thread_key);
176 }
177
178 void Thread::setCurrent(Thread * thrd)
179 {
180 PEG_METHOD_ENTER(TRC_THREAD, "Thread::setCurrent");
181 if (Thread::initializeKey() == 0)
182 {
183 if (pegasus_set_thread_specific(Thread::_platform_thread_key,
184 (void *) thrd) == 0)
185 {
186 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
187 "Successful set Thread * into thread specific storage");
188 }
189 else
190 {
191 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
192 "ERROR: got error setting Thread * into thread specific storage");
193 }
194 }
195 PEG_METHOD_EXIT();
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196 chuck 1.37 }
197
198 AcceptLanguages * Thread::getLanguages()
199 {
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200 chuck 1.39 PEG_METHOD_ENTER(TRC_THREAD, "Thread::getLanguages");
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201 chuck 1.37
202 Thread * curThrd = Thread::getCurrent();
203 if (curThrd == NULL)
204 return NULL;
205 AcceptLanguages * acceptLangs =
206 (AcceptLanguages *)curThrd->reference_tsd("acceptLanguages");
207 curThrd->dereference_tsd();
208 PEG_METHOD_EXIT();
209 return acceptLangs;
210 }
211
212 void Thread::setLanguages(AcceptLanguages *langs) //l10n
213 {
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214 chuck 1.39 PEG_METHOD_ENTER(TRC_THREAD, "Thread::setLanguages");
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215 chuck 1.37
216 Thread * currentThrd = Thread::getCurrent();
217 if (currentThrd != NULL)
218 {
219 // deletes the old tsd and creates a new one
220 currentThrd->put_tsd("acceptLanguages",
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221 chuck 1.43 language_delete,
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222 chuck 1.37 sizeof(AcceptLanguages *),
223 langs);
224 }
225
226 PEG_METHOD_EXIT();
227 }
228
229 void Thread::clearLanguages() //l10n
230 {
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231 chuck 1.39 PEG_METHOD_ENTER(TRC_THREAD, "Thread::clearLanguages");
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232 chuck 1.37
233 Thread * currentThrd = Thread::getCurrent();
234 if (currentThrd != NULL)
235 {
236 // deletes the old tsd
237 currentThrd->delete_tsd("acceptLanguages");
238 }
239
240 PEG_METHOD_EXIT();
241 }
242 // l10n end
243
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244 mday 1.20 DQueue<ThreadPool> ThreadPool::_pools(true);
245
246
247 void ThreadPool::kill_idle_threads(void)
248 {
249 static struct timeval now, last = {0, 0};
250
251 pegasus_gettimeofday(&now);
252 if(now.tv_sec - last.tv_sec > 5)
253 {
254 _pools.lock();
255 ThreadPool *p = _pools.next(0);
256 while(p != 0)
257 {
258 try
259 {
260 p->kill_dead_threads();
261 }
262 catch(...)
263 {
264 }
265 mday 1.20 p = _pools.next(p);
266 }
267 _pools.unlock();
268 pegasus_gettimeofday(&last);
269 }
270 }
271
272
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273 mike 1.2 ThreadPool::ThreadPool(Sint16 initial_size,
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274 kumpf 1.8 const Sint8 *key,
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275 mike 1.2 Sint16 min,
276 Sint16 max,
277 struct timeval & alloc_wait,
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278 chip 1.11 struct timeval & dealloc_wait,
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279 mike 1.2 struct timeval & deadlock_detect)
280 : _max_threads(max), _min_threads(min),
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281 mday 1.12 _current_threads(0),
282 _pool(true), _running(true),
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283 mike 1.2 _dead(true), _dying(0)
284 {
285 _allocate_wait.tv_sec = alloc_wait.tv_sec;
286 _allocate_wait.tv_usec = alloc_wait.tv_usec;
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287 chip 1.11 _deallocate_wait.tv_sec = dealloc_wait.tv_sec;
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288 mike 1.2 _deallocate_wait.tv_usec = dealloc_wait.tv_usec;
289 _deadlock_detect.tv_sec = deadlock_detect.tv_sec;
290 _deadlock_detect.tv_usec = deadlock_detect.tv_usec;
291 memset(_key, 0x00, 17);
292 if(key != 0)
293 strncpy(_key, key, 16);
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294 mday 1.21 if(_max_threads > 0 && _max_threads < initial_size)
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295 mike 1.2 _max_threads = initial_size;
296 if(_min_threads > initial_size)
297 _min_threads = initial_size;
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298 chip 1.11
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299 mike 1.2 int i;
300 for(i = 0; i < initial_size; i++)
301 {
302 _link_pool(_init_thread());
303 }
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304 mday 1.20 _pools.insert_last(this);
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305 mike 1.2 }
306
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307 chip 1.11
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308 mike 1.2
309 ThreadPool::~ThreadPool(void)
310 {
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311 mday 1.47
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312 mday 1.35 try
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313 mday 1.47 {
314 {
315 auto_mutex(&(this->_monitor));
316 _dying++;
317 }
318
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319 mday 1.35 _pools.remove(this);
320 Thread *th = 0;
321 th = _pool.remove_first();
322 while(th != 0)
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323 mike 1.2 {
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324 mday 1.35 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
325
326 if(sleep_sem == 0)
327 {
328 th->dereference_tsd();
329 throw NullPointer();
330 }
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331 mday 1.47
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332 s.hills 1.49 // Signal to get the thread out of the work loop.
333 sleep_sem->signal();
334 // Signal to get the thread past the end. See the comment
335 // "wait to be awakend by the thread pool destructor"
336 // Note: the current implementation of Thread for Windows
337 // does not implement "pthread" cancelation points so this
338 // is needed.
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339 mday 1.35 sleep_sem->signal();
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340 s.hills 1.49
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341 mike 1.2 th->dereference_tsd();
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342 mday 1.35 // signal the thread's sleep semaphore
343 th->cancel();
344 th->join();
345 th->empty_tsd();
346 delete th;
347 th = _pool.remove_first();
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348 mike 1.2 }
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349 mday 1.47
350 th = _dead.remove_first();
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351 mday 1.35 while(th != 0)
352 {
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353 mday 1.47 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
354
355 if(sleep_sem == 0)
356 {
357 th->dereference_tsd();
358 throw NullPointer();
359 }
360
361
362 sleep_sem->signal();
363 th->dereference_tsd();
364
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365 mday 1.35 // signal the thread's sleep semaphore
366 th->cancel();
367 th->join();
368 th->empty_tsd();
369 delete th;
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370 mday 1.47 th = _dead.remove_first();
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371 mday 1.35 }
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372 mday 1.47 {
373
374 auto_mutex(&(this->_monitor));
375 th = _running.remove_first();
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376 mday 1.35 while(th != 0)
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377 mday 1.47 {
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378 mday 1.35 // signal the thread's sleep semaphore
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379 mday 1.47 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
380 if(sleep_sem == 0 )
381 {
382 th->dereference_tsd();
383 throw NullPointer();
384 }
385
386 sleep_sem->signal();
387 th->dereference_tsd();
388
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389 mday 1.35 th->cancel();
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390 mday 1.47
391 // ensure that th->run() has a chance to execute so that the join will not
392 // block
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393 mday 1.35 th->join();
394 th->empty_tsd();
395 delete th;
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396 mday 1.47 th = _running.remove_first();
397 }
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398 mday 1.35 }
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399 mday 1.47
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400 mike 1.2 }
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401 mday 1.47
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402 mday 1.35 catch(...)
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403 mike 1.2 {
404 }
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405 mday 1.47
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406 mike 1.2 }
407
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408 chip 1.11 // make this static to the class
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409 mike 1.2 PEGASUS_THREAD_RETURN PEGASUS_THREAD_CDECL ThreadPool::_loop(void *parm)
410 {
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411 kumpf 1.14 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop");
412
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413 mike 1.2 Thread *myself = (Thread *)parm;
414 if(myself == 0)
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415 kumpf 1.14 {
416 PEG_METHOD_EXIT();
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417 mike 1.2 throw NullPointer();
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418 kumpf 1.14 }
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419 chuck 1.37
420 // l10n
421 // Set myself into thread specific storage
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422 chuck 1.38 // This will allow code to get its own Thread
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423 chuck 1.39 Thread::setCurrent(myself);
424
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425 mike 1.2 ThreadPool *pool = (ThreadPool *)myself->get_parm();
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426 kumpf 1.14 if(pool == 0 )
427 {
428 PEG_METHOD_EXIT();
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429 mike 1.2 throw NullPointer();
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430 kumpf 1.14 }
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431 mday 1.47
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432 mike 1.5 Semaphore *sleep_sem = 0;
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433 mday 1.13 Semaphore *blocking_sem = 0;
434
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435 mike 1.5 struct timeval *deadlock_timer = 0;
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436 mday 1.47
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437 chip 1.11 try
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438 mike 1.2 {
439 sleep_sem = (Semaphore *)myself->reference_tsd("sleep sem");
440 myself->dereference_tsd();
441 deadlock_timer = (struct timeval *)myself->reference_tsd("deadlock timer");
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442 mday 1.22 myself->dereference_tsd();
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443 mike 1.2 }
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444 mike 1.6 catch(IPCException &)
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445 mike 1.2 {
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446 kumpf 1.14 PEG_METHOD_EXIT();
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447 mday 1.47 return(0);
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448 mike 1.2 }
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449 mday 1.30 catch(...)
450 {
451 PEG_METHOD_EXIT();
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452 mday 1.47 return(0);
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453 mday 1.30 }
454
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455 mike 1.2 if(sleep_sem == 0 || deadlock_timer == 0)
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456 kumpf 1.14 {
457 PEG_METHOD_EXIT();
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458 mike 1.2 throw NullPointer();
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459 kumpf 1.14 }
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460 mike 1.2
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461 mday 1.47 while(pool->_dying.value() < 1)
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462 mike 1.2 {
463 sleep_sem->wait();
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464 mday 1.35
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465 mike 1.2 // when we awaken we reside on the running queue, not the pool queue
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466 chip 1.11
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467 mday 1.47
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468 mike 1.5 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *_work)(void *) = 0;
469 void *parm = 0;
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470 mike 1.2
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471 chip 1.11 try
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472 mike 1.2 {
473 _work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) \
474 myself->reference_tsd("work func");
475 myself->dereference_tsd();
476 parm = myself->reference_tsd("work parm");
477 myself->dereference_tsd();
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478 mday 1.13 blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem");
479 myself->dereference_tsd();
480
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481 mike 1.2 }
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482 mike 1.6 catch(IPCException &)
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483 mike 1.2 {
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484 kumpf 1.14 PEG_METHOD_EXIT();
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485 mday 1.47 return(0);
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486 mike 1.2 }
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487 chip 1.11
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488 mike 1.2 if(_work == 0)
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489 kumpf 1.14 {
490 PEG_METHOD_EXIT();
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491 mike 1.2 throw NullPointer();
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492 kumpf 1.14 }
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493 kumpf 1.24
494 if(_work ==
495 (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)) &_undertaker)
496 {
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497 mday 1.23 _work(parm);
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498 kumpf 1.24 }
499
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500 mike 1.2 gettimeofday(deadlock_timer, NULL);
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501 mday 1.20 try
502 {
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503 mday 1.47 {
504 auto_mutex(&(pool->_monitor));
505 if(pool->_dying.value())
506 {
507 break;
508 }
509 }
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510 mday 1.20 _work(parm);
511 }
512 catch(...)
513 {
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514 mday 1.47 return((PEGASUS_THREAD_RETURN)0);
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515 mday 1.20 }
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516 chuck 1.37
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517 mday 1.47
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518 mday 1.13
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519 chip 1.11 // put myself back onto the available list
520 try
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521 mike 1.2 {
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522 mday 1.47 auto_mutex(&(pool->_monitor));
523 if(pool->_dying.value() == 0)
524 {
525 gettimeofday(deadlock_timer, NULL);
526 if( blocking_sem != 0 )
527 blocking_sem->signal();
528
529 pool->_running.remove((void *)myself);
530 pool->_pool.insert_first(myself);
531 }
532 else
533 {
534 PEG_METHOD_EXIT();
535 return((PEGASUS_THREAD_RETURN)0);
536 }
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537 mike 1.2 }
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538 mike 1.6 catch(IPCException &)
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539 mike 1.2 {
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540 kumpf 1.14 PEG_METHOD_EXIT();
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541 mday 1.47 return((PEGASUS_THREAD_RETURN)0);
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542 mike 1.2 }
543 }
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544 s.hills 1.49
545 // TODO: Why is this needed? Why not just continue?
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546 mike 1.2 // wait to be awakend by the thread pool destructor
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547 mday 1.50 //sleep_sem->wait();
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548 s.hills 1.49
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549 mike 1.2 myself->test_cancel();
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550 kumpf 1.14
551 PEG_METHOD_EXIT();
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552 mike 1.2 myself->exit_self(0);
553 return((PEGASUS_THREAD_RETURN)0);
554 }
555
556 void ThreadPool::allocate_and_awaken(void *parm,
557 PEGASUS_THREAD_RETURN \
|
558 mday 1.13 (PEGASUS_THREAD_CDECL *work)(void *),
559 Semaphore *blocking)
560
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561 mike 1.2 throw(IPCException)
562 {
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563 kumpf 1.14 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken");
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564 mike 1.2 struct timeval start;
565 gettimeofday(&start, NULL);
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566 mday 1.47 Thread *th = 0;
567
568 try
569 {
570 auto_mutex(&(this->_monitor));
571 if(_dying.value())
572 {
573 return;
574 }
575 th = _pool.remove_first();
576 }
577 catch(...)
578 {
579 return;
580
581 }
582
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583 mday 1.12
|
584 mday 1.7 // wait for the right interval and try again
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585 mday 1.47 while (th == 0 && _dying.value() < 1)
|
586 mike 1.2 {
|
587 mday 1.47 // will throw an IPCException&
|
588 mday 1.12 _check_deadlock(&start) ;
589
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590 mday 1.21 if(_max_threads == 0 || _current_threads < _max_threads)
|
591 mday 1.35 {
592 th = _init_thread();
593 continue;
594 }
595 pegasus_yield();
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596 mday 1.47 try
597 {
598 auto_mutex(&(this->_monitor));
599 if(_dying.value())
600 {
601 return;
602 }
603 th = _pool.remove_first();
604 }
605 catch(...)
606 {
607 return ;
608 }
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609 mday 1.7 }
|
610 chip 1.11
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611 mday 1.47 if(_dying.value() < 1)
|
612 mike 1.2 {
613 // initialize the thread data with the work function and parameters
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614 kumpf 1.14 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
615 "Initializing thread with work function and parameters: parm = %p",
616 parm);
617
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618 kumpf 1.15 th->delete_tsd("work func");
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619 chip 1.11 th->put_tsd("work func", NULL,
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620 mike 1.2 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),
621 (void *)work);
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622 kumpf 1.15 th->delete_tsd("work parm");
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623 mike 1.2 th->put_tsd("work parm", NULL, sizeof(void *), parm);
|
624 kumpf 1.15 th->delete_tsd("blocking sem");
|
625 mday 1.13 if(blocking != 0 )
626 th->put_tsd("blocking sem", NULL, sizeof(Semaphore *), blocking);
|
627 mday 1.47 try
628 {
629 auto_mutex(&(this->_monitor));
630 if(_dying.value())
631 {
632 th->cancel();
633 th->join();
634 delete th;
635 return;
636 }
637
638 // put the thread on the running list
639
|
640 mike 1.2
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641 mday 1.47 _running.insert_first(th);
|
642 mike 1.2 // signal the thread's sleep semaphore to awaken it
|
643 mday 1.47 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
644
645 if(sleep_sem == 0)
646 {
647 th->dereference_tsd();
648 PEG_METHOD_EXIT();
649 throw NullPointer();
650 }
651 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken");
652 sleep_sem->signal();
653 th->dereference_tsd();
654 }
655 catch(...)
|
656 mike 1.2 {
|
657 mday 1.47 PEG_METHOD_EXIT();
658 return;
|
659 mike 1.2 }
|
660 mday 1.47
|
661 mike 1.2 }
662 else
|
663 mday 1.47 {
664 th->cancel();
665 th->join();
666 delete th;
667 }
668
|
669 kumpf 1.14 PEG_METHOD_EXIT();
|
670 mike 1.2 }
671
672 // caller is responsible for only calling this routine during slack periods
673 // but should call it at least once per _deadlock_detect with the running q
674 // and at least once per _deallocate_wait for the pool q
675
|
676 mday 1.12 Uint32 ThreadPool::kill_dead_threads(void)
|
677 mike 1.2 throw(IPCException)
678 {
679 struct timeval now;
680 gettimeofday(&now, NULL);
|
681 mday 1.12 Uint32 bodies = 0;
682
|
683 mike 1.2 // first go thread the dead q and clean it up as much as possible
|
684 mday 1.47 try
685 {
686 auto_mutex(&(this->_monitor));
687 if(_dying.value() )
688 {
689 return 0;
690 }
691
692 while(_dead.count() > 0 && _dying.value() == 0 )
693 {
694 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "ThreadPool:: removing and joining dead thread");
695 Thread *dead = _dead.remove_first();
696
697 if(dead == 0)
698 throw NullPointer();
699 dead->join();
700 delete dead;
701 }
702 }
703 catch(...)
|
704 mike 1.2 {
705 }
|
706 mday 1.47
707
|
708 chip 1.11 DQueue<Thread> * map[2] =
|
709 mike 1.2 {
710 &_pool, &_running
711 };
|
712 chip 1.11
713
|
714 mike 1.2 DQueue<Thread> *q = 0;
715 int i = 0;
716 AtomicInt needed(0);
|
717 chip 1.11
|
718 kumpf 1.31 #ifdef PEGASUS_DISABLE_KILLING_HUNG_THREADS
719 // This change prevents the thread pool from killing "hung" threads.
720 // The definition of a "hung" thread is one that has been on the run queue
721 // for longer than the time interval set when the thread pool was created.
722 // Cancelling "hung" threads has proven to be problematic.
723
724 // With this change the thread pool will not cancel "hung" threads. This
725 // may prevent a crash depending upon the state of the "hung" thread. In
726 // the case that the thread is actually hung, this change causes the
727 // thread resources not to be reclaimed.
728
729 // Idle threads, those that have not executed a routine for a time
730 // interval, continue to be destroyed. This is normal and should not
731 // cause any problems.
732 for( ; i < 1; i++)
733 #else
|
734 mday 1.30 for( ; i < 2; i++)
|
735 kumpf 1.31 #endif
|
736 mday 1.47 {
737 auto_mutex(&(this->_monitor));
|
738 mday 1.21 q = map[i];
|
739 mike 1.2 if(q->count() > 0 )
740 {
|
741 chip 1.11 try
|
742 mike 1.2 {
|
743 mday 1.47 if(_dying.value())
744 {
745 return bodies;
746 }
747
|
748 mike 1.2 q->try_lock();
749 }
|
750 mday 1.18 catch(...)
|
751 mike 1.2 {
|
752 mday 1.18 return bodies;
|
753 mike 1.2 }
754
755 struct timeval dt = { 0, 0 };
756 struct timeval *dtp;
757 Thread *th = 0;
758 th = q->next(th);
759 while (th != 0 )
760 {
|
761 chip 1.11 try
|
762 mike 1.2 {
763 dtp = (struct timeval *)th->try_reference_tsd("deadlock timer");
764 }
|
765 mday 1.18 catch(...)
|
766 mike 1.2 {
|
767 kumpf 1.25 q->unlock();
|
768 mday 1.18 return bodies;
|
769 mike 1.2 }
|
770 chip 1.11
|
771 mike 1.2 if(dtp != 0)
772 {
773 memcpy(&dt, dtp, sizeof(struct timeval));
774 }
775 th->dereference_tsd();
776 struct timeval deadlock_timeout;
|
777 mday 1.18 Boolean too_long;
778 if( i == 0)
779 {
780 too_long = check_time(&dt, get_deallocate_wait(&deadlock_timeout));
781 }
782 else
783 {
|
784 mday 1.22 too_long = check_time(&dt, get_deadlock_detect(&deadlock_timeout));
|
785 mday 1.18 }
786
787 if( true == too_long)
|
788 mike 1.2 {
789 // if we are deallocating from the pool, escape if we are
|
790 chip 1.11 // down to the minimum thread count
|
791 mday 1.13 _current_threads--;
|
792 mday 1.18 if( _current_threads.value() < (Uint32)_min_threads )
|
793 mike 1.2 {
|
794 mday 1.13 if( i == 0)
|
795 mike 1.2 {
|
796 mday 1.13 _current_threads++;
|
797 mike 1.2 th = q->next(th);
798 continue;
799 }
|
800 chip 1.11 else
|
801 mike 1.2 {
|
802 chip 1.11 // we are killing a hung thread and we will drop below the
|
803 mike 1.2 // minimum. create another thread to make up for the one
804 // we are about to kill
805 needed++;
806 }
807 }
|
808 chip 1.11
|
809 mike 1.2 th = q->remove_no_lock((void *)th);
|
810 chip 1.11
|
811 mike 1.2 if(th != 0)
812 {
|
813 mday 1.30 if( i == 0 )
|
814 mike 1.2 {
|
815 mday 1.30 th->delete_tsd("work func");
816 th->put_tsd("work func", NULL,
817 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL *)(void *)),
818 (void *)&_undertaker);
819 th->delete_tsd("work parm");
820 th->put_tsd("work parm", NULL, sizeof(void *), th);
821
822 // signal the thread's sleep semaphore to awaken it
823 Semaphore *sleep_sem = (Semaphore *)th->reference_tsd("sleep sem");
824
825 if(sleep_sem == 0)
826 {
827 q->unlock();
828 th->dereference_tsd();
829 throw NullPointer();
830 }
831
832 bodies++;
|
833 mike 1.2 th->dereference_tsd();
|
834 mday 1.30 _dead.insert_first(th);
835 sleep_sem->signal();
836 th = 0;
837 }
838 else
839 {
840 // deadlocked threads
|
841 mday 1.34 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Killing a deadlocked thread");
|
842 mday 1.30 th->cancel();
843 delete th;
|
844 mike 1.2 }
845 }
846 }
847 th = q->next(th);
|
848 mday 1.20 pegasus_sleep(1);
|
849 mike 1.2 }
850 q->unlock();
851 }
852 }
|
853 mday 1.47 if(_dying.value() )
854 return bodies;
855
856 while (needed.value() > 0) {
857 _link_pool(_init_thread());
858 needed--;
859 pegasus_sleep(0);
860 }
|
861 mday 1.18 return bodies;
|
862 mike 1.2 }
863
|
864 mday 1.12
|
865 mike 1.2 Boolean ThreadPool::check_time(struct timeval *start, struct timeval *interval)
866 {
|
867 mday 1.22 // never time out if the interval is zero
868 if(interval && interval->tv_sec == 0 && interval->tv_usec == 0)
869 return false;
870
|
871 mday 1.36 struct timeval now, finish, remaining ;
|
872 mday 1.13 Uint32 usec;
|
873 mday 1.33 pegasus_gettimeofday(&now);
|
874 mday 1.36 /* remove valgrind error */
875 pegasus_gettimeofday(&remaining);
876
|
877 mday 1.13
878 finish.tv_sec = start->tv_sec + interval->tv_sec;
879 usec = start->tv_usec + interval->tv_usec;
880 finish.tv_sec += (usec / 1000000);
881 usec %= 1000000;
882 finish.tv_usec = usec;
883
884 if ( timeval_subtract(&remaining, &finish, &now) )
|
885 mike 1.2 return true;
886 else
887 return false;
888 }
889
890 PEGASUS_THREAD_RETURN ThreadPool::_undertaker( void *parm )
891 {
|
892 mday 1.30 exit_thread((PEGASUS_THREAD_RETURN)1);
893 return (PEGASUS_THREAD_RETURN)1;
|
894 mike 1.2 }
|
895 mday 1.19
896
897 void ThreadPool::_sleep_sem_del(void *p)
898 {
899 if(p != 0)
900 {
901 delete (Semaphore *)p;
902 }
903 }
904
905 void ThreadPool::_check_deadlock(struct timeval *start) throw(Deadlock)
906 {
907 if (true == check_time(start, &_deadlock_detect))
908 throw Deadlock(pegasus_thread_self());
909 return;
910 }
911
912
913 Boolean ThreadPool::_check_deadlock_no_throw(struct timeval *start)
914 {
915 return(check_time(start, &_deadlock_detect));
916 mday 1.19 }
917
918 Boolean ThreadPool::_check_dealloc(struct timeval *start)
919 {
920 return(check_time(start, &_deallocate_wait));
921 }
922
923 Thread *ThreadPool::_init_thread(void) throw(IPCException)
924 {
925 Thread *th = (Thread *) new Thread(_loop, this, false);
926 // allocate a sleep semaphore and pass it in the thread context
927 // initial count is zero, loop function will sleep until
928 // we signal the semaphore
929 Semaphore *sleep_sem = (Semaphore *) new Semaphore(0);
930 th->put_tsd("sleep sem", &_sleep_sem_del, sizeof(Semaphore), (void *)sleep_sem);
931
932 struct timeval *dldt = (struct timeval *) ::operator new(sizeof(struct timeval));
|
933 mday 1.35 pegasus_gettimeofday(dldt);
934
|
935 mday 1.19 th->put_tsd("deadlock timer", thread_data::default_delete, sizeof(struct timeval), (void *)dldt);
936 // thread will enter _loop(void *) and sleep on sleep_sem until we signal it
|
937 chuck 1.37
|
938 mday 1.19 th->run();
939 _current_threads++;
940 pegasus_yield();
941
942 return th;
943 }
944
945 void ThreadPool::_link_pool(Thread *th) throw(IPCException)
946 {
947 if(th == 0)
948 throw NullPointer();
|
949 mday 1.47 try
950 {
951
952 auto_mutex(&(this->_monitor));
953 if(_dying.value())
954 {
955 th->cancel();
956 th->join();
957 delete th;
958 }
959
960 _pool.insert_first(th);
961
962 }
963 catch(...)
964 {
965 }
|
966 mday 1.19 }
|
967 mike 1.2
968
969 PEGASUS_NAMESPACE_END
970
|
Return to
Thread.cpp
CVS log
Up to [Pegasus] / pegasus / src / Pegasus / Common