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

Return to Thread.cpp CVS log

Up to [Pegasus] / pegasus / src / Pegasus / Common

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 // for non-native implementations
91 chip 1.11 #ifndef PEGASUS_THREAD_CLEANUP_NATIVE
92 david.dillard 1.83 void Thread::cleanup_push( void (routine)(void ), void *parm)
93 mike 1.2 {
94 a.arora 1.64 AutoPtr<cleanup_handler> cu(new cleanup_handler(routine, parm));
95 a.arora 1.65 _cleanup.insert_first(cu.get());
96 a.arora 1.64 cu.release();
97 mike 1.2 return; 98 }
99 kumpf 1.81
100 david.dillard 1.83 void Thread::cleanup_pop(Boolean execute)
101 mike 1.2 {
102 david.dillard 1.83 AutoPtr<cleanup_handler> cu;
103 chip 1.11 try 104 {
105 kumpf 1.81 cu.reset(_cleanup.remove_first());
106 mike 1.2 }
107 chip 1.11 catch(IPCException&)
108 mike 1.2 {
109 kumpf 1.81 PEGASUS_ASSERT(0);
110 mike 1.2 } 111 if(execute == true)
112 kumpf 1.81 cu->execute();
113 mike 1.2 }
114 kumpf 1.81
115 mike 1.2 #endif 116 117
118 david.dillard 1.83 //thread_data Thread::put_tsd(const Sint8 key, void (delete_func)(void ), Uint32 size, void *value)
119 mike 1.2 120
121 chip 1.11 #ifndef PEGASUS_THREAD_EXIT_NATIVE 122 void Thread::exit_self(PEGASUS_THREAD_RETURN exit_code) 123 { 124 // execute the cleanup stack and then return
125 mike 1.2 while( _cleanup.count() ) 126 {
127 chip 1.11 try 128 {
129 kumpf 1.81 cleanup_pop(true);
130 chip 1.11 } 131 catch(IPCException&) 132 {
133 kumpf 1.81 PEGASUS_ASSERT(0); 134 break;
135 mike 1.2 } 136 } 137 _exit_code = exit_code; 138 exit_thread(exit_code);
139 mday 1.4 _handle.thid = 0;
140 mike 1.2 } 141 142 143 #endif 144
145 chuck 1.37 // l10n start
146 chuck 1.39 Sint8 Thread::initializeKey() 147 {
148 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::initializeKey"); 149 if (!Thread::_key_initialized) 150 { 151 if (Thread::_key_error) 152 { 153 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 154 "Thread: ERROR - thread key error"); 155 return -1; 156 } 157 158 if (pegasus_key_create(&Thread::_platform_thread_key) == 0) 159 { 160 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 161 "Thread: able to create a thread key"); 162 Thread::_key_initialized = true; 163 } 164 else 165 { 166 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 167 "Thread: ERROR - unable to create a thread key"); 168 Thread::_key_error = true; 169 kumpf 1.81 return -1; 170 } 171 }
172 chuck 1.39
173 kumpf 1.81 PEG_METHOD_EXIT(); 174 return 0;
175 chuck 1.39 } 176
177 chuck 1.37 Thread * Thread::getCurrent() 178 {
179 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::getCurrent");
180 chuck 1.40 if (Thread::initializeKey() != 0)
181 chuck 1.39 {
182 kumpf 1.81 return NULL;
183 chuck 1.39 }
184 kumpf 1.81 PEG_METHOD_EXIT(); 185 return (Thread *)pegasus_get_thread_specific(_platform_thread_key);
186 chuck 1.39 } 187 188 void Thread::setCurrent(Thread * thrd) 189 {
190 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::setCurrent"); 191 if (Thread::initializeKey() == 0) 192 { 193 if (pegasus_set_thread_specific( 194 Thread::_platform_thread_key, (void *) thrd) == 0)
195 chuck 1.39 {
196 kumpf 1.81 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 197 "Successful set Thread * into thread specific storage");
198 chuck 1.39 } 199 else 200 {
201 kumpf 1.81 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 202 "ERROR: error setting Thread * into thread specific storage");
203 chuck 1.39 }
204 kumpf 1.81 } 205 PEG_METHOD_EXIT();
206 chuck 1.37 } 207 208 AcceptLanguages * Thread::getLanguages() 209 {
210 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::getLanguages"); 211 212 Thread * curThrd = Thread::getCurrent(); 213 if (curThrd == NULL) 214 return NULL; 215 AcceptLanguages * acceptLangs = 216 (AcceptLanguages *)curThrd->reference_tsd("acceptLanguages"); 217 curThrd->dereference_tsd(); 218 PEG_METHOD_EXIT(); 219 return acceptLangs;
220 chuck 1.37 } 221 222 void Thread::setLanguages(AcceptLanguages *langs) //l10n 223 {
224 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::setLanguages"); 225 226 Thread* currentThrd = Thread::getCurrent(); 227 if (currentThrd != NULL) 228 { 229 // deletes the old tsd and creates a new one 230 currentThrd->put_tsd("acceptLanguages", 231 language_delete, 232 sizeof(AcceptLanguages *), 233 langs); 234 } 235 236 PEG_METHOD_EXIT();
237 chuck 1.37 } 238 239 void Thread::clearLanguages() //l10n 240 {
241 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "Thread::clearLanguages"); 242 243 Thread * currentThrd = Thread::getCurrent(); 244 if (currentThrd != NULL) 245 { 246 // deletes the old tsd 247 currentThrd->delete_tsd("acceptLanguages"); 248 } 249 250 PEG_METHOD_EXIT();
251 chuck 1.37 }
252 kumpf 1.81 // l10n end
253 chuck 1.37
254 mday 1.52
255 kumpf 1.81 /////////////////////////////////////////////////////////////////////////////// 256 // 257 // ThreadPool 258 // 259 /////////////////////////////////////////////////////////////////////////////// 260 261 ThreadPool::ThreadPool( 262 Sint16 initialSize, 263 const char* key, 264 Sint16 minThreads, 265 Sint16 maxThreads, 266 struct timeval& deallocateWait) 267 : _maxThreads(maxThreads), 268 _minThreads(minThreads), 269 _currentThreads(0), 270 _idleThreads(true), 271 _runningThreads(true), 272 _dying(0)
273 mday 1.58 {
274 kumpf 1.81 _deallocateWait.tv_sec = deallocateWait.tv_sec; 275 _deallocateWait.tv_usec = deallocateWait.tv_usec;
276 mday 1.58
277 kumpf 1.81 memset(_key, 0x00, 17); 278 if (key != 0) 279 { 280 strncpy(_key, key, 16); 281 } 282 283 if ((_maxThreads > 0) && (_maxThreads < initialSize)) 284 { 285 _maxThreads = initialSize; 286 }
287 mday 1.58
288 kumpf 1.81 if (_minThreads > initialSize) 289 { 290 _minThreads = initialSize; 291 }
292 mday 1.52
293 kumpf 1.81 for (int i = 0; i < initialSize; i++) 294 { 295 _addToIdleThreadsQueue(_initializeThread()); 296 } 297 }
298 mday 1.20
299 kumpf 1.81 ThreadPool::~ThreadPool()
300 mday 1.20 {
301 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::~ThreadPool"); 302 try 303 { 304 // Set the dying flag so all thread know the destructor has been entered 305 _dying++; 306 307 while (_currentThreads.value() > 0) 308 { 309 Thread* thread = _idleThreads.remove_first(); 310 if (thread != 0) 311 { 312 _cleanupThread(thread); 313 _currentThreads--; 314 } 315 else 316 { 317 pegasus_yield(); 318 } 319 } 320 } 321 catch (...) 322 kumpf 1.81 { 323 }
324 mday 1.20 } 325
326 kumpf 1.81 PEGASUS_THREAD_RETURN PEGASUS_THREAD_CDECL ThreadPool::_loop(void* parm) 327 { 328 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop"); 329 330 try 331 {
332 kumpf 1.82 Thread* myself = (Thread *)parm; 333 PEGASUS_ASSERT(myself != 0);
334 kumpf 1.81
335 kumpf 1.82 // Set myself into thread specific storage 336 // This will allow code to get its own Thread 337 Thread::setCurrent(myself);
338 kumpf 1.81
339 kumpf 1.82 ThreadPool* pool = (ThreadPool *)myself->get_parm(); 340 PEGASUS_ASSERT(pool != 0);
341 mike 1.2
342 kumpf 1.82 Semaphore* sleep_sem = 0; 343 struct timeval* lastActivityTime = 0;
344 chuck 1.39
345 kumpf 1.81 try 346 {
347 kumpf 1.82 sleep_sem = (Semaphore *)myself->reference_tsd("sleep sem");
348 kumpf 1.81 myself->dereference_tsd();
349 kumpf 1.82 PEGASUS_ASSERT(sleep_sem != 0); 350 351 lastActivityTime = 352 (struct timeval *)myself->reference_tsd("last activity time");
353 kumpf 1.81 myself->dereference_tsd();
354 kumpf 1.82 PEGASUS_ASSERT(lastActivityTime != 0);
355 kumpf 1.81 } 356 catch (...) 357 { 358 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2,
359 kumpf 1.82 "ThreadPool::_loop: Failure getting sleep_sem or " 360 "lastActivityTime.");
361 kumpf 1.81 PEGASUS_ASSERT(false); 362 pool->_idleThreads.remove(myself); 363 pool->_currentThreads--; 364 PEG_METHOD_EXIT(); 365 return((PEGASUS_THREAD_RETURN)1); 366 }
367 mday 1.52
368 kumpf 1.82 while (1)
369 kumpf 1.81 {
370 kumpf 1.82 try 371 { 372 sleep_sem->wait(); 373 } 374 catch (...) 375 { 376 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 377 "ThreadPool::_loop: failure on sleep_sem->wait()."); 378 PEGASUS_ASSERT(false); 379 pool->_idleThreads.remove(myself); 380 pool->_currentThreads--; 381 PEG_METHOD_EXIT(); 382 return((PEGASUS_THREAD_RETURN)1); 383 } 384 385 // When we awaken we reside on the _runningThreads queue, not the 386 // _idleThreads queue. 387 388 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL* work)(void ) = 0; 389 void parm = 0; 390 Semaphore* blocking_sem = 0; 391 kumpf 1.82 392 try 393 { 394 work = (PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL )(void )) 395 myself->reference_tsd("work func"); 396 myself->dereference_tsd(); 397 parm = myself->reference_tsd("work parm"); 398 myself->dereference_tsd(); 399 blocking_sem = (Semaphore *)myself->reference_tsd("blocking sem"); 400 myself->dereference_tsd(); 401 } 402 catch (...) 403 { 404 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 405 "ThreadPool::_loop: Failure accessing work func, work parm, " 406 "or blocking sem."); 407 PEGASUS_ASSERT(false); 408 pool->_idleThreads.remove(myself); 409 pool->_currentThreads--; 410 PEG_METHOD_EXIT(); 411 return((PEGASUS_THREAD_RETURN)1); 412 kumpf 1.82 } 413 414 if (work == 0) 415 { 416 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 417 "ThreadPool::_loop: work func is 0, meaning we should exit."); 418 break; 419 }
420 mike 1.2
421 kumpf 1.82 gettimeofday(lastActivityTime, NULL);
422 konrad.r 1.67
423 kumpf 1.82 try 424 { 425 PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, "Work starting."); 426 work(parm); 427 PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, "Work finished."); 428 } 429 catch (Exception & e) 430 { 431 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 432 String("Exception from work in ThreadPool::_loop: ") + 433 e.getMessage()); 434 }
435 kumpf 1.68 #if !defined(PEGASUS_OS_LSB)
436 kumpf 1.82 catch (exception& e) 437 { 438 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 439 String("Exception from work in ThreadPool::_loop: ") + 440 e.what()); 441 }
442 kumpf 1.68 #endif
443 kumpf 1.82 catch (...) 444 { 445 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 446 "Unknown exception from work in ThreadPool::_loop."); 447 }
448 kumpf 1.81
449 kumpf 1.82 // put myself back onto the available list 450 try
451 kumpf 1.57 {
452 kumpf 1.82 gettimeofday(lastActivityTime, NULL); 453 if (blocking_sem != 0) 454 { 455 blocking_sem->signal(); 456 }
457 s.hills 1.49
458 kumpf 1.82 Boolean removed = pool->_runningThreads.remove((void *)myself); 459 PEGASUS_ASSERT(removed);
460 s.hills 1.49
461 kumpf 1.82 pool->_idleThreads.insert_first(myself); 462 } 463 catch (...) 464 { 465 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 466 "ThreadPool::_loop: Adding thread to idle pool failed."); 467 PEGASUS_ASSERT(false); 468 pool->_currentThreads--; 469 PEG_METHOD_EXIT(); 470 return((PEGASUS_THREAD_RETURN)1); 471 }
472 kumpf 1.81 }
473 kumpf 1.82 } 474 catch (const Exception& e) 475 { 476 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 477 "Caught exception: \"" + e.getMessage() + "\". Exiting _loop."); 478 } 479 catch (...) 480 { 481 PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, 482 "Caught unrecognized exception. Exiting _loop.");
483 kumpf 1.81 }
484 kumpf 1.14
485 kumpf 1.81 PEG_METHOD_EXIT(); 486 return((PEGASUS_THREAD_RETURN)0);
487 mike 1.2 } 488
489 kumpf 1.81 Boolean ThreadPool::allocate_and_awaken( 490 void* parm, 491 PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL* work)(void ), 492 Semaphore blocking)
493 mike 1.2 {
494 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken"); 495 496 // Allocate_and_awaken will not run if the _dying flag is set. 497 // Once the lock is acquired, ~ThreadPool will not change 498 // the value of _dying until the lock is released. 499 500 try 501 { 502 if (_dying.value()) 503 { 504 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 505 "ThreadPool::allocate_and_awaken: ThreadPool is dying(1)."); 506 // ATTN: Error result has not yet been defined 507 return true; 508 } 509 struct timeval start; 510 gettimeofday(&start, NULL); 511 Thread* th = 0; 512 513 th = _idleThreads.remove_first();
514 kumpf 1.57
515 kumpf 1.81 if (th == 0) 516 { 517 if ((_maxThreads == 0) \|\| (_currentThreads < _maxThreads)) 518 { 519 th = _initializeThread(); 520 } 521 } 522 523 if (th == 0) 524 { 525 // ATTN-DME-P3-20031103: This trace message should not be 526 // be labeled TRC_DISCARDED_DATA, because it does not 527 // necessarily imply that a failure has occurred. However, 528 // this label is being used temporarily to help isolate 529 // the cause of client timeout problems.
530 kumpf 1.60
531 kumpf 1.81 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 532 "ThreadPool::allocate_and_awaken: Insufficient resources: " 533 " pool = %s, running threads = %d, idle threads = %d", 534 _key, _runningThreads.count(), _idleThreads.count()); 535 return false; 536 }
537 mike 1.2
538 kumpf 1.81 // initialize the thread data with the work function and parameters 539 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, 540 "Initializing thread with work function and parameters: parm = %p", 541 parm);
542 mike 1.2
543 kumpf 1.81 th->delete_tsd("work func"); 544 th->put_tsd("work func", NULL,
545 kumpf 1.70 sizeof( PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL )(void )),
546 kumpf 1.81 (void )work); 547 th->delete_tsd("work parm"); 548 th->put_tsd("work parm", NULL, sizeof(void ), parm); 549 th->delete_tsd("blocking sem"); 550 if (blocking != 0) 551 th->put_tsd("blocking sem", NULL, sizeof(Semaphore ), blocking); 552 553 // put the thread on the running list 554 _runningThreads.insert_first(th); 555 556 // signal the thread's sleep semaphore to awaken it 557 Semaphore sleep_sem = (Semaphore *)th->reference_tsd("sleep sem"); 558 PEGASUS_ASSERT(sleep_sem != 0); 559 560 Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken"); 561 sleep_sem->signal(); 562 th->dereference_tsd();
563 kumpf 1.57 }
564 mday 1.58 catch (...)
565 kumpf 1.57 {
566 kumpf 1.81 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 567 "ThreadPool::allocate_and_awaken: Operation Failed."); 568 PEG_METHOD_EXIT(); 569 // ATTN: Error result has not yet been defined 570 return true;
571 kumpf 1.57 }
572 kumpf 1.81 PEG_METHOD_EXIT(); 573 return true;
574 mike 1.2 } 575
576 kumpf 1.81 // caller is responsible for only calling this routine during slack periods 577 // but should call it at least once per _deallocateWait interval.
578 mday 1.12
579 kumpf 1.81 Uint32 ThreadPool::cleanupIdleThreads()
580 mike 1.2 {
581 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupIdleThreads"); 582 583 Uint32 numThreadsCleanedUp = 0; 584 585 Uint32 numIdleThreads = _idleThreads.count(); 586 for (Uint32 i = 0; i < numIdleThreads; i++) 587 { 588 // Do not dip below the minimum thread count 589 if (_currentThreads.value() <= (Uint32)_minThreads) 590 { 591 break; 592 } 593 594 Thread* thread = _idleThreads.remove_last(); 595 596 // If there are no more threads in the _idleThreads queue, we're done. 597 if (thread == 0) 598 { 599 break; 600 } 601 602 kumpf 1.81 struct timeval* lastActivityTime; 603 try 604 { 605 lastActivityTime = (struct timeval *)thread->try_reference_tsd( 606 "last activity time"); 607 PEGASUS_ASSERT(lastActivityTime != 0); 608 } 609 catch (...) 610 { 611 PEGASUS_ASSERT(false); 612 _idleThreads.insert_last(thread); 613 break; 614 } 615 616 Boolean cleanupThisThread = 617 _timeIntervalExpired(lastActivityTime, &_deallocateWait); 618 thread->dereference_tsd(); 619 620 if (cleanupThisThread) 621 { 622 _cleanupThread(thread); 623 kumpf 1.81 _currentThreads--; 624 numThreadsCleanedUp++; 625 } 626 else 627 { 628 _idleThreads.insert_first(thread); 629 }
630 konrad.r 1.67 }
631 kumpf 1.81 632 PEG_METHOD_EXIT(); 633 return numThreadsCleanedUp;
634 konrad.r 1.67 }
635 mday 1.19
636 kumpf 1.81 void ThreadPool::_cleanupThread(Thread* thread)
637 mday 1.19 {
638 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupThread"); 639 640 // Set the "work func" and "work parm" to 0 so _loop() knows to exit. 641 thread->delete_tsd("work func"); 642 thread->put_tsd( 643 "work func", 0, 644 sizeof(PEGASUS_THREAD_RETURN (PEGASUS_THREAD_CDECL )(void )), 645 (void ) 0); 646 thread->delete_tsd("work parm"); 647 thread->put_tsd("work parm", 0, sizeof(void ), 0); 648 649 // signal the thread's sleep semaphore to awaken it 650 Semaphore* sleep_sem = (Semaphore *)thread->reference_tsd("sleep sem"); 651 PEGASUS_ASSERT(sleep_sem != 0); 652 sleep_sem->signal(); 653 thread->dereference_tsd(); 654 655 thread->join(); 656 delete thread; 657 658 PEG_METHOD_EXIT();
659 mday 1.19 } 660
661 kumpf 1.81 Boolean ThreadPool::_timeIntervalExpired( 662 struct timeval* start, 663 struct timeval* interval)
664 mday 1.19 {
665 kumpf 1.81 // never time out if the interval is zero 666 if (interval && (interval->tv_sec == 0) && (interval->tv_usec == 0)) 667 { 668 return false; 669 } 670 671 struct timeval now, finish, remaining; 672 Uint32 usec; 673 pegasus_gettimeofday(&now); 674 pegasus_gettimeofday(&remaining); // Avoid valgrind error 675 676 finish.tv_sec = start->tv_sec + interval->tv_sec; 677 usec = start->tv_usec + interval->tv_usec; 678 finish.tv_sec += (usec / 1000000); 679 usec %= 1000000; 680 finish.tv_usec = usec; 681 682 return (timeval_subtract(&remaining, &finish, &now) != 0);
683 mday 1.19 } 684
685 kumpf 1.81 void ThreadPool::_deleteSemaphore(void *p)
686 mday 1.19 {
687 kumpf 1.81 delete (Semaphore *)p;
688 mday 1.19 } 689
690 kumpf 1.81 Thread* ThreadPool::_initializeThread()
691 mday 1.19 {
692 kumpf 1.81 PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_initializeThread"); 693 694 Thread* th = (Thread ) new Thread(_loop, this, false); 695 696 // allocate a sleep semaphore and pass it in the thread context 697 // initial count is zero, loop function will sleep until 698 // we signal the semaphore 699 Semaphore sleep_sem = (Semaphore ) new Semaphore(0); 700 th->put_tsd( 701 "sleep sem", &_deleteSemaphore, sizeof(Semaphore), (void )sleep_sem); 702 703 struct timeval* lastActivityTime = 704 (struct timeval ) ::operator new(sizeof(struct timeval)); 705 pegasus_gettimeofday(lastActivityTime); 706 707 th->put_tsd("last activity time", thread_data::default_delete, 708 sizeof(struct timeval), (void )lastActivityTime); 709 // thread will enter _loop() and sleep on sleep_sem until we signal it 710 711 if (!th->run()) 712 { 713 kumpf 1.81 delete th; 714 return 0; 715 } 716 _currentThreads++; 717 pegasus_yield(); 718 719 PEG_METHOD_EXIT(); 720 return th;
721 mday 1.19 }
722 mike 1.2
723 kumpf 1.81 void ThreadPool::_addToIdleThreadsQueue(Thread* th) 724 { 725 if (th == 0) 726 { 727 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 728 "ThreadPool::_addToIdleThreadsQueue: Thread pointer is null."); 729 throw NullPointer(); 730 } 731 732 try 733 { 734 _idleThreads.insert_first(th); 735 } 736 catch (...) 737 { 738 Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, 739 "ThreadPool::_addToIdleThreadsQueue: _idleThreads.insert_first " 740 "failed."); 741 } 742 }
743 mike 1.2 744 PEGASUS_NAMESPACE_END

No CVS admin address has been configured