pegasus/src/Pegasus/Common/Thread.cpp - annotate

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1 karl 1.75 //%2005////////////////////////////////////////////////////////////////////////
2 mike 1.2 //
3 karl 1.71 // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development 4 // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems. 5 // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
6 karl 1.56 // IBM Corp.; EMC Corporation, The Open Group.
7 karl 1.71 // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.; 8 // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
9 karl 1.75 // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.; 10 // EMC Corporation; VERITAS Software Corporation; The Open Group.
11 mike 1.2 // 12 // Permission is hereby granted, free of charge, to any person obtaining a copy
13 chip 1.11 // of this software and associated documentation files (the "Software"), to 14 // deal in the Software without restriction, including without limitation the 15 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
16 mike 1.2 // sell copies of the Software, and to permit persons to whom the Software is 17 // furnished to do so, subject to the following conditions:
18 david.dillard 1.83 //
19 chip 1.11 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
20 mike 1.2 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED 21 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
22 chip 1.11 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 23 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 24 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 mike 1.2 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 27 // 28 //============================================================================== 29 // 30 // Author: Mike Day (mdday@us.ibm.com) 31 // 32 // Modified By: Rudy Schuet (rudy.schuet@compaq.com) 11/12/01
33 chip 1.11 // added nsk platform support
34 kumpf 1.59 // Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com)
35 a.arora 1.64 // Amit K Arora, IBM (amita@in.ibm.com) for PEP#101
36 gs.keenan 1.76 // Sean Keenan, Hewlett-Packard Company (sean.keenan@hp.com)
37 david.dillard 1.83 // David Dillard, VERITAS Software Corp. 38 // (david.dillard@veritas.com)
39 mike 1.2 // 40 //%///////////////////////////////////////////////////////////////////////////// 41 42 #include "Thread.h"
43 kumpf 1.68 #include <exception>
44 mike 1.2 #include <Pegasus/Common/IPC.h>
45 kumpf 1.14 #include <Pegasus/Common/Tracer.h>
46 mike 1.2 47 #if defined(PEGASUS_OS_TYPE_WINDOWS)
48 chip 1.11 # include "ThreadWindows.cpp"
49 mike 1.2 #elif defined(PEGASUS_OS_TYPE_UNIX) 50 # include "ThreadUnix.cpp" 51 #elif defined(PEGASUS_OS_TYPE_NSK) 52 # include "ThreadNsk.cpp"
53 gs.keenan 1.76 #elif defined(PEGASUS_OS_VMS) 54 # include "ThreadVms.cpp"
55 mike 1.2 #else 56 # error "Unsupported platform" 57 #endif 58
59 kumpf 1.69 PEGASUS_USING_STD;
60 mike 1.2 PEGASUS_NAMESPACE_BEGIN 61
62 mday 1.42
63 chip 1.11 void thread_data::default_delete(void * data) 64 {
65 mike 1.2 if( data != NULL)
66 chip 1.11 ::operator delete(data);
67 mike 1.2 } 68
69 chuck 1.43 // l10n start 70 void language_delete(void * data) 71 { 72 if( data != NULL) 73 {
74 a.arora 1.64 AutoPtr<AcceptLanguages> al(static_cast<AcceptLanguages *>(data));
75 chuck 1.43 } 76 } 77 // l10n end 78
79 mike 1.2 Boolean Thread::_signals_blocked = false;
80 chuck 1.37 // l10n
81 marek 1.63 #ifndef PEGASUS_OS_ZOS
82 w.otsuka 1.74 PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key = PEGASUS_THREAD_KEY_TYPE(-1);
83 marek 1.63 #else 84 PEGASUS_THREAD_KEY_TYPE Thread::_platform_thread_key; 85 #endif
86 chuck 1.37 Boolean Thread::_key_initialized = false;
87 chuck 1.41 Boolean Thread::_key_error = false;
88 chuck 1.37
89 mike 1.2
90 david.dillard 1.83 void Thread::cleanup_push( void (routine)(void ), void *parm)
91 mike 1.2 {
92 a.arora 1.64 AutoPtr<cleanup_handler> cu(new cleanup_handler(routine, parm));
93 a.arora 1.65 _cleanup.insert_first(cu.get());
94 a.arora 1.64 cu.release();
95 mike 1.2 return; 96 }
97 kumpf 1.81
98 david.dillard 1.83 void Thread::cleanup_pop(Boolean execute)
99 mike 1.2 {
100 david.dillard 1.83 AutoPtr<cleanup_handler> cu;
101 chip 1.11 try 102 {
103 kumpf 1.81 cu.reset(_cleanup.remove_first());
104 mike 1.2 }
105 chip 1.11 catch(IPCException&)
106 mike 1.2 {
107 kumpf 1.81 PEGASUS_ASSERT(0);
108 mike 1.2 } 109 if(execute == true)
110 kumpf 1.81 cu->execute();
111 mike 1.2 }
112 kumpf 1.81
113 mike 1.2
114 david.dillard 1.83 //thread_data Thread::put_tsd(const Sint8 key, void (delete_func)(void ), Uint32 size, void *value)
115 mike 1.2 116
117 chip 1.11 #ifndef PEGASUS_THREAD_EXIT_NATIVE 118 void Thread::exit_self(PEGASUS_THREAD_RETURN exit_code) 119 { 120 // execute the cleanup stack and then return
121 mike 1.2 while( _cleanup.count() ) 122 {
123 chip 1.11 try 124 {
125 kumpf 1.81 cleanup_pop(true);
126 chip 1.11 } 127 catch(IPCException&) 128 {
129 kumpf 1.81 PEGASUS_ASSERT(0); 130 break;
131 mike 1.2 } 132 } 133 _exit_code = exit_code; 134 exit_thread(exit_code);
135 mday 1.4 _handle.thid = 0;
136 mike 1.2 } 137 138 139 #endif 140
141 chuck 1.37 // l10n start
142 chuck 1.39 Sint8 Thread::initializeKey() 143 {
144 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::initializeKey"); 145 if (!Thread::_key_initialized) 146 { 147 if (Thread::_key_error) 148 { 149 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 150 "Thread: ERROR - thread key error"); 151 return -1; 152 } 153 154 if (pegasus_key_create(&Thread::_platform_thread_key) == 0) 155 { 156 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 157 "Thread: able to create a thread key"); 158 Thread::_key_initialized = true; 159 } 160 else 161 { 162 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 163 "Thread: ERROR - unable to create a thread key"); 164 Thread::_key_error = true; 165 kumpf 1.81 return -1; 166 } 167 }
168 chuck 1.39
169 kumpf 1.81 PEG_METHOD_EXIT(); 170 return 0;
171 chuck 1.39 } 172
173 chuck 1.37 Thread * Thread::getCurrent() 174 {
175 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::getCurrent");
176 chuck 1.40 if (Thread::initializeKey() != 0)
177 chuck 1.39 {
178 kumpf 1.81 return NULL;
179 chuck 1.39 }
180 kumpf 1.81 PEG_METHOD_EXIT(); 181 return (Thread *)pegasus_get_thread_specific(_platform_thread_key);
182 chuck 1.39 } 183 184 void Thread::setCurrent(Thread * thrd) 185 {
186 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::setCurrent"); 187 if (Thread::initializeKey() == 0) 188 { 189 if (pegasus_set_thread_specific( 190 Thread::_platform_thread_key, (void *) thrd) == 0)
191 chuck 1.39 {
192 kumpf 1.81 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 193 "Successful set Thread * into thread specific storage");
194 chuck 1.39 } 195 else 196 {
197 kumpf 1.81 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 198 "ERROR: error setting Thread * into thread specific storage");
199 chuck 1.39 }
200 kumpf 1.81 } 201 PEG_METHOD_EXIT();
202 chuck 1.37 } 203 204 AcceptLanguages * Thread::getLanguages() 205 {
206 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::getLanguages"); 207 208 Thread * curThrd = Thread::getCurrent(); 209 if (curThrd == NULL) 210 return NULL; 211 AcceptLanguages * acceptLangs = 212 (AcceptLanguages *)curThrd->reference_tsd("acceptLanguages"); 213 curThrd->dereference_tsd(); 214 PEG_METHOD_EXIT(); 215 return acceptLangs;
216 chuck 1.37 } 217 218 void Thread::setLanguages(AcceptLanguages *langs) //l10n 219 {
220 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::setLanguages"); 221 222 Thread* currentThrd = Thread::getCurrent(); 223 if (currentThrd != NULL) 224 { 225 // deletes the old tsd and creates a new one 226 currentThrd->put_tsd("acceptLanguages", 227 language_delete, 228 sizeof(AcceptLanguages *), 229 langs); 230 } 231 232 PEG_METHOD_EXIT();
233 chuck 1.37 } 234 235 void Thread::clearLanguages() //l10n 236 {
237 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::clearLanguages"); 238 239 Thread * currentThrd = Thread::getCurrent(); 240 if (currentThrd != NULL) 241 { 242 // deletes the old tsd 243 currentThrd->delete_tsd("acceptLanguages"); 244 } 245 246 PEG_METHOD_EXIT();
247 chuck 1.37 }
248 kumpf 1.81 // l10n end
249 chuck 1.37
250 mday 1.52
251 kumpf 1.81 /////////////////////////////////////////////////////////////////////////////// 252 // 253 // ThreadPool 254 // 255 /////////////////////////////////////////////////////////////////////////////// 256 257 ThreadPool::ThreadPool( 258 Sint16 initialSize, 259 const char* key, 260 Sint16 minThreads, 261 Sint16 maxThreads, 262 struct timeval& deallocateWait) 263 : _maxThreads(maxThreads), 264 _minThreads(minThreads), 265 _currentThreads(0), 266 _idleThreads(true), 267 _runningThreads(true), 268 _dying(0)
269 mday 1.58 {
270 kumpf 1.81 _deallocateWait.tv_sec = deallocateWait.tv_sec; 271 _deallocateWait.tv_usec = deallocateWait.tv_usec;
272 mday 1.58
273 kumpf 1.81 memset(_key, 0x00, 17); 274 if (key != 0) 275 { 276 strncpy(_key, key, 16); 277 } 278 279 if ((_maxThreads > 0) && (_maxThreads < initialSize)) 280 { 281 _maxThreads = initialSize; 282 }
283 mday 1.58
284 kumpf 1.81 if (_minThreads > initialSize) 285 { 286 _minThreads = initialSize; 287 }
288 mday 1.52
289 kumpf 1.81 for (int i = 0; i < initialSize; i++) 290 { 291 _addToIdleThreadsQueue(_initializeThread()); 292 } 293 }
294 mday 1.20
295 kumpf 1.81 ThreadPool::~ThreadPool()
296 mday 1.20 {
297 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::~ThreadPool"); 298 try 299 { 300 // Set the dying flag so all thread know the destructor has been entered 301 _dying++; 302 303 while (_currentThreads.value() > 0) 304 { 305 Thread* thread = _idleThreads.remove_first(); 306 if (thread != 0) 307 { 308 _cleanupThread(thread); 309 _currentThreads--; 310 } 311 else 312 { 313 pegasus_yield(); 314 } 315 } 316 } 317 catch (...) 318 kumpf 1.81 { 319 }
320 mday 1.20 } 321
322 kumpf 1.81 PEGASUS_THREAD_RETURN PEGASUS_THREAD_CDECL ThreadPool::_loop(void* parm) 323 { 324 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop"); 325 326 try 327 {
328 kumpf 1.82 Thread* myself = (Thread *)parm; 329 PEGASUS_ASSERT(myself != 0);
330 kumpf 1.81
331 kumpf 1.82 // Set myself into thread specific storage 332 // This will allow code to get its own Thread 333 Thread::setCurrent(myself);
334 kumpf 1.81
335 kumpf 1.82 ThreadPool* pool = (ThreadPool *)myself->get_parm(); 336 PEGASUS_ASSERT(pool != 0);
337 mike 1.2
338 kumpf 1.82 Semaphore* sleep_sem = 0; 339 struct timeval* lastActivityTime = 0;
340 chuck 1.39
341 kumpf 1.81 try 342 {
343 kumpf 1.82 sleep_sem = (Semaphore *)myself->reference_tsd("sleep sem");
344 kumpf 1.81 myself->dereference_tsd();
345 kumpf 1.82 PEGASUS_ASSERT(sleep_sem != 0); 346 347 lastActivityTime = 348 (struct timeval *)myself->reference_tsd("last activity time");
349 kumpf 1.81 myself->dereference_tsd();
350 kumpf 1.82 PEGASUS_ASSERT(lastActivityTime != 0);
351 kumpf 1.81 } 352 catch (...) 353 { 354 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,
355 kumpf 1.82 "ThreadPool::_loop: Failure getting sleep_sem or " 356 "lastActivityTime.");
357 kumpf 1.81 PEGASUS_ASSERT(false); 358 pool->_idleThreads.remove(myself); 359 pool->_currentThreads--; 360 PEG_METHOD_EXIT(); 361 return((PEGASUS_THREAD_RETURN)1); 362 }
363 mday 1.52
364 kumpf 1.82 while (1)
365 kumpf 1.81 {
366 kumpf 1.82 try 367 { 368 sleep_sem->wait(); 369 } 370 catch (...) 371 { 372 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 373 "ThreadPool::_loop: failure on sleep_sem->wait()."); 374 PEGASUS_ASSERT(false); 375 pool->_idleThreads.remove(myself); 376 pool->_currentThreads--; 377 PEG_METHOD_EXIT(); 378 return((PEGASUS_THREAD_RETURN)1); 379 } 380 381 // When we awaken we reside on the _runningThreads queue, not the 382 // _idleThreads queue. 383 384 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL* work)(void ) = 0; 385 void parm = 0; 386 Semaphore* blocking_sem = 0; 387 kumpf 1.82 388 try 389 { 390 work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL )(void )) 391 myself->reference_tsd("work func"); 392 myself->dereference_tsd(); 393 parm = myself->reference_tsd("work parm"); 394 myself->dereference_tsd(); 395 blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem"); 396 myself->dereference_tsd(); 397 } 398 catch (...) 399 { 400 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 401 "ThreadPool::_loop: Failure accessing work func, work parm, " 402 "or blocking sem."); 403 PEGASUS_ASSERT(false); 404 pool->_idleThreads.remove(myself); 405 pool->_currentThreads--; 406 PEG_METHOD_EXIT(); 407 return((PEGASUS_THREAD_RETURN)1); 408 kumpf 1.82 } 409 410 if (work == 0) 411 {
412 carolann.graves 1.84 Tracer::trace(TRC_THREAD, Tracer::LEVEL4,
413 kumpf 1.82 "ThreadPool::_loop: work func is 0, meaning we should exit."); 414 break; 415 }
416 mike 1.2
417 kumpf 1.82 gettimeofday(lastActivityTime, NULL);
418 konrad.r 1.67
419 kumpf 1.82 try 420 { 421 PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, "Work starting."); 422 work(parm); 423 PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, "Work finished."); 424 } 425 catch (Exception & e) 426 { 427 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 428 String("Exception from work in ThreadPool::_loop: ") + 429 e.getMessage()); 430 }
431 kumpf 1.68 #if !defined(PEGASUS_OS_LSB)
432 kumpf 1.82 catch (exception& e) 433 { 434 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 435 String("Exception from work in ThreadPool::_loop: ") + 436 e.what()); 437 }
438 kumpf 1.68 #endif
439 kumpf 1.82 catch (...) 440 { 441 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 442 "Unknown exception from work in ThreadPool::_loop."); 443 }
444 kumpf 1.81
445 kumpf 1.82 // put myself back onto the available list 446 try
447 kumpf 1.57 {
448 kumpf 1.82 gettimeofday(lastActivityTime, NULL); 449 if (blocking_sem != 0) 450 { 451 blocking_sem->signal(); 452 }
453 s.hills 1.49
454 kumpf 1.82 Boolean removed = pool->_runningThreads.remove((void *)myself); 455 PEGASUS_ASSERT(removed);
456 s.hills 1.49
457 kumpf 1.82 pool->_idleThreads.insert_first(myself); 458 } 459 catch (...) 460 { 461 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 462 "ThreadPool::_loop: Adding thread to idle pool failed."); 463 PEGASUS_ASSERT(false); 464 pool->_currentThreads--; 465 PEG_METHOD_EXIT(); 466 return((PEGASUS_THREAD_RETURN)1); 467 }
468 kumpf 1.81 }
469 kumpf 1.82 } 470 catch (const Exception& e) 471 { 472 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 473 "Caught exception: \"" + e.getMessage() + "\". Exiting _loop."); 474 } 475 catch (...) 476 { 477 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 478 "Caught unrecognized exception. Exiting _loop.");
479 kumpf 1.81 }
480 kumpf 1.14
481 kumpf 1.81 PEG_METHOD_EXIT(); 482 return((PEGASUS_THREAD_RETURN)0);
483 mike 1.2 } 484
485 kumpf 1.81 Boolean ThreadPool::allocate_and_awaken( 486 void* parm, 487 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL* work)(void ), 488 Semaphore blocking)
489 mike 1.2 {
490 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken"); 491 492 // Allocate_and_awaken will not run if the _dying flag is set. 493 // Once the lock is acquired, ~ThreadPool will not change 494 // the value of _dying until the lock is released. 495 496 try 497 { 498 if (_dying.value()) 499 { 500 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 501 "ThreadPool::allocate_and_awaken: ThreadPool is dying(1)."); 502 // ATTN: Error result has not yet been defined 503 return true; 504 } 505 struct timeval start; 506 gettimeofday(&start, NULL); 507 Thread* th = 0; 508 509 th = _idleThreads.remove_first();
510 kumpf 1.57
511 kumpf 1.81 if (th == 0) 512 { 513 if ((_maxThreads == 0) \|\| (_currentThreads < _maxThreads)) 514 { 515 th = _initializeThread(); 516 } 517 } 518 519 if (th == 0) 520 { 521 // ATTN-DME-P3-20031103: This trace message should not be 522 // be labeled TRC_DISCARDED_DATA, because it does not 523 // necessarily imply that a failure has occurred. However, 524 // this label is being used temporarily to help isolate 525 // the cause of client timeout problems.
526 kumpf 1.60
527 kumpf 1.81 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 528 "ThreadPool::allocate_and_awaken: Insufficient resources: " 529 " pool = %s, running threads = %d, idle threads = %d", 530 _key, _runningThreads.count(), _idleThreads.count()); 531 return false; 532 }
533 mike 1.2
534 kumpf 1.81 // initialize the thread data with the work function and parameters 535 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 536 "Initializing thread with work function and parameters: parm = %p", 537 parm);
538 mike 1.2
539 kumpf 1.81 th->delete_tsd("work func"); 540 th->put_tsd("work func", NULL,
541 kumpf 1.70 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL )(void )),
542 kumpf 1.81 (void )work); 543 th->delete_tsd("work parm"); 544 th->put_tsd("work parm", NULL, sizeof(void ), parm); 545 th->delete_tsd("blocking sem"); 546 if (blocking != 0) 547 th->put_tsd("blocking sem", NULL, sizeof(Semaphore ), blocking); 548 549 // put the thread on the running list 550 _runningThreads.insert_first(th); 551 552 // signal the thread's sleep semaphore to awaken it 553 Semaphore sleep_sem = (Semaphore *)th->reference_tsd("sleep sem"); 554 PEGASUS_ASSERT(sleep_sem != 0); 555 556 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken"); 557 sleep_sem->signal(); 558 th->dereference_tsd();
559 kumpf 1.57 }
560 mday 1.58 catch (...)
561 kumpf 1.57 {
562 kumpf 1.81 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 563 "ThreadPool::allocate_and_awaken: Operation Failed."); 564 PEG_METHOD_EXIT(); 565 // ATTN: Error result has not yet been defined 566 return true;
567 kumpf 1.57 }
568 kumpf 1.81 PEG_METHOD_EXIT(); 569 return true;
570 mike 1.2 } 571
572 kumpf 1.81 // caller is responsible for only calling this routine during slack periods 573 // but should call it at least once per _deallocateWait interval.
574 mday 1.12
575 kumpf 1.81 Uint32 ThreadPool::cleanupIdleThreads()
576 mike 1.2 {
577 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupIdleThreads"); 578 579 Uint32 numThreadsCleanedUp = 0; 580 581 Uint32 numIdleThreads = _idleThreads.count(); 582 for (Uint32 i = 0; i < numIdleThreads; i++) 583 { 584 // Do not dip below the minimum thread count 585 if (_currentThreads.value() <= (Uint32)_minThreads) 586 { 587 break; 588 } 589 590 Thread* thread = _idleThreads.remove_last(); 591 592 // If there are no more threads in the _idleThreads queue, we're done. 593 if (thread == 0) 594 { 595 break; 596 } 597 598 kumpf 1.81 struct timeval* lastActivityTime; 599 try 600 { 601 lastActivityTime = (struct timeval *)thread->try_reference_tsd( 602 "last activity time"); 603 PEGASUS_ASSERT(lastActivityTime != 0); 604 } 605 catch (...) 606 { 607 PEGASUS_ASSERT(false); 608 _idleThreads.insert_last(thread); 609 break; 610 } 611 612 Boolean cleanupThisThread = 613 _timeIntervalExpired(lastActivityTime, &_deallocateWait); 614 thread->dereference_tsd(); 615 616 if (cleanupThisThread) 617 { 618 _cleanupThread(thread); 619 kumpf 1.81 _currentThreads--; 620 numThreadsCleanedUp++; 621 } 622 else 623 { 624 _idleThreads.insert_first(thread); 625 }
626 konrad.r 1.67 }
627 kumpf 1.81 628 PEG_METHOD_EXIT(); 629 return numThreadsCleanedUp;
630 konrad.r 1.67 }
631 mday 1.19
632 kumpf 1.81 void ThreadPool::_cleanupThread(Thread* thread)
633 mday 1.19 {
634 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupThread"); 635 636 // Set the "work func" and "work parm" to 0 so _loop() knows to exit. 637 thread->delete_tsd("work func"); 638 thread->put_tsd( 639 "work func", 0, 640 sizeof(PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL )(void )), 641 (void ) 0); 642 thread->delete_tsd("work parm"); 643 thread->put_tsd("work parm", 0, sizeof(void ), 0); 644 645 // signal the thread's sleep semaphore to awaken it 646 Semaphore* sleep_sem = (Semaphore *)thread->reference_tsd("sleep sem"); 647 PEGASUS_ASSERT(sleep_sem != 0); 648 sleep_sem->signal(); 649 thread->dereference_tsd(); 650 651 thread->join(); 652 delete thread; 653 654 PEG_METHOD_EXIT();
655 mday 1.19 } 656
657 kumpf 1.81 Boolean ThreadPool::_timeIntervalExpired( 658 struct timeval* start, 659 struct timeval* interval)
660 mday 1.19 {
661 kumpf 1.81 // never time out if the interval is zero 662 if (interval && (interval->tv_sec == 0) && (interval->tv_usec == 0)) 663 { 664 return false; 665 } 666 667 struct timeval now, finish, remaining; 668 Uint32 usec; 669 pegasus_gettimeofday(&now); 670 pegasus_gettimeofday(&remaining); // Avoid valgrind error 671 672 finish.tv_sec = start->tv_sec + interval->tv_sec; 673 usec = start->tv_usec + interval->tv_usec; 674 finish.tv_sec += (usec / 1000000); 675 usec %= 1000000; 676 finish.tv_usec = usec; 677 678 return (timeval_subtract(&remaining, &finish, &now) != 0);
679 mday 1.19 } 680
681 kumpf 1.81 void ThreadPool::_deleteSemaphore(void *p)
682 mday 1.19 {
683 kumpf 1.81 delete (Semaphore *)p;
684 mday 1.19 } 685
686 kumpf 1.81 Thread* ThreadPool::_initializeThread()
687 mday 1.19 {
688 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_initializeThread"); 689 690 Thread* th = (Thread ) new Thread(_loop, this, false); 691 692 // allocate a sleep semaphore and pass it in the thread context 693 // initial count is zero, loop function will sleep until 694 // we signal the semaphore 695 Semaphore sleep_sem = (Semaphore ) new Semaphore(0); 696 th->put_tsd( 697 "sleep sem", &_deleteSemaphore, sizeof(Semaphore), (void )sleep_sem); 698 699 struct timeval* lastActivityTime = 700 (struct timeval ) ::operator new(sizeof(struct timeval)); 701 pegasus_gettimeofday(lastActivityTime); 702 703 th->put_tsd("last activity time", thread_data::default_delete, 704 sizeof(struct timeval), (void )lastActivityTime); 705 // thread will enter _loop() and sleep on sleep_sem until we signal it 706 707 if (!th->run()) 708 { 709 kumpf 1.81 delete th; 710 return 0; 711 } 712 _currentThreads++; 713 pegasus_yield(); 714 715 PEG_METHOD_EXIT(); 716 return th;
717 mday 1.19 }
718 mike 1.2
719 kumpf 1.81 void ThreadPool::_addToIdleThreadsQueue(Thread* th) 720 { 721 if (th == 0) 722 { 723 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 724 "ThreadPool::_addToIdleThreadsQueue: Thread pointer is null."); 725 throw NullPointer(); 726 } 727 728 try 729 { 730 _idleThreads.insert_first(th); 731 } 732 catch (...) 733 { 734 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 735 "ThreadPool::_addToIdleThreadsQueue: _idleThreads.insert_first " 736 "failed."); 737 } 738 }
739 mike 1.2 740 PEGASUS_NAMESPACE_END

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