1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
|
/*=========================================================================
Program: Visualization Toolkit
Module: vtkMultiThreader.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkMultiThreader.h"
#include "vtkMutexLock.h"
#include "vtkObjectFactory.h"
#include "vtkWindows.h"
vtkStandardNewMacro(vtkMultiThreader);
// These are the includes necessary for multithreaded rendering on an SGI
// using the sproc() call
#ifdef VTK_USE_SPROC
#include <sys/resource.h>
#include <sys/prctl.h>
#include <wait.h>
#include <errno.h>
#endif
// Need to define "vtkExternCThreadFunctionType" to avoid warning on some
// platforms about passing function pointer to an argument expecting an
// extern "C" function. Placing the typedef of the function pointer type
// inside an extern "C" block solves this problem.
#if defined(VTK_USE_PTHREADS) || defined(VTK_HP_PTHREADS)
#include <pthread.h>
extern "C" { typedef void *(*vtkExternCThreadFunctionType)(void *); }
#else
typedef vtkThreadFunctionType vtkExternCThreadFunctionType;
#endif
#ifdef __APPLE__
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
// Initialize static member that controls global maximum number of threads
static int vtkMultiThreaderGlobalMaximumNumberOfThreads = 0;
void vtkMultiThreader::SetGlobalMaximumNumberOfThreads(int val)
{
if (val == vtkMultiThreaderGlobalMaximumNumberOfThreads)
{
return;
}
vtkMultiThreaderGlobalMaximumNumberOfThreads = val;
}
int vtkMultiThreader::GetGlobalMaximumNumberOfThreads()
{
return vtkMultiThreaderGlobalMaximumNumberOfThreads;
}
// 0 => Not initialized.
static int vtkMultiThreaderGlobalDefaultNumberOfThreads = 0;
void vtkMultiThreader::SetGlobalDefaultNumberOfThreads(int val)
{
if (val == vtkMultiThreaderGlobalDefaultNumberOfThreads)
{
return;
}
vtkMultiThreaderGlobalDefaultNumberOfThreads = val;
}
int vtkMultiThreader::GetGlobalDefaultNumberOfThreads()
{
if (vtkMultiThreaderGlobalDefaultNumberOfThreads == 0)
{
int num = 1; // default is 1
#ifdef VTK_USE_SPROC
// Default the number of threads to be the number of available
// processors if we are using sproc()
num = prctl( PR_MAXPPROCS );
#endif
#ifdef VTK_USE_PTHREADS
// Default the number of threads to be the number of available
// processors if we are using pthreads()
#ifdef _SC_NPROCESSORS_ONLN
num = sysconf( _SC_NPROCESSORS_ONLN );
#elif defined(_SC_NPROC_ONLN)
num = sysconf( _SC_NPROC_ONLN );
#endif
#if defined(__SVR4) && defined(sun) && defined(PTHREAD_MUTEX_NORMAL)
pthread_setconcurrency(num);
#endif
#endif
#ifdef __APPLE__
// Determine the number of CPU cores.
// hw.logicalcpu takes into account cores/CPUs that are
// disabled because of power management.
size_t dataLen = sizeof(int); // 'num' is an 'int'
int result = sysctlbyname ("hw.logicalcpu", &num, &dataLen, NULL, 0);
if (result == -1)
{
num = 1;
}
#endif
#ifdef _WIN32
{
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
num = sysInfo.dwNumberOfProcessors;
}
#endif
#ifndef VTK_USE_WIN32_THREADS
#ifndef VTK_USE_SPROC
#ifndef VTK_USE_PTHREADS
// If we are not multithreading, the number of threads should
// always be 1
num = 1;
#endif
#endif
#endif
// Lets limit the number of threads to VTK_MAX_THREADS
if (num > VTK_MAX_THREADS)
{
num = VTK_MAX_THREADS;
}
vtkMultiThreaderGlobalDefaultNumberOfThreads = num;
}
return vtkMultiThreaderGlobalDefaultNumberOfThreads;
}
// Constructor. Default all the methods to NULL. Since the
// ThreadInfoArray is static, the ThreadIDs can be initialized here
// and will not change.
vtkMultiThreader::vtkMultiThreader()
{
for ( int i = 0; i < VTK_MAX_THREADS; i++ )
{
this->ThreadInfoArray[i].ThreadID = i;
this->ThreadInfoArray[i].ActiveFlag = NULL;
this->ThreadInfoArray[i].ActiveFlagLock = NULL;
this->MultipleMethod[i] = NULL;
this->SpawnedThreadActiveFlag[i] = 0;
this->SpawnedThreadActiveFlagLock[i] = NULL;
this->SpawnedThreadInfoArray[i].ThreadID = i;
}
this->SingleMethod = NULL;
this->NumberOfThreads =
vtkMultiThreader::GetGlobalDefaultNumberOfThreads();
}
// Destructor. Nothing allocated so nothing needs to be done here.
vtkMultiThreader::~vtkMultiThreader()
{
for ( int i = 0; i < VTK_MAX_THREADS; i++ )
{
if ( this->ThreadInfoArray[i].ActiveFlagLock )
{
this->ThreadInfoArray[i].ActiveFlagLock->Delete();
}
if ( this->SpawnedThreadActiveFlagLock[i] )
{
this->SpawnedThreadActiveFlagLock[i]->Delete();
}
}
}
//----------------------------------------------------------------------------
int vtkMultiThreader::GetNumberOfThreads()
{
int num = this->NumberOfThreads;
if(vtkMultiThreaderGlobalMaximumNumberOfThreads > 0 &&
num > vtkMultiThreaderGlobalMaximumNumberOfThreads)
{
num = vtkMultiThreaderGlobalMaximumNumberOfThreads;
}
return num;
}
// Set the user defined method that will be run on NumberOfThreads threads
// when SingleMethodExecute is called.
void vtkMultiThreader::SetSingleMethod( vtkThreadFunctionType f,
void *data )
{
this->SingleMethod = f;
this->SingleData = data;
}
// Set one of the user defined methods that will be run on NumberOfThreads
// threads when MultipleMethodExecute is called. This method should be
// called with index = 0, 1, .., NumberOfThreads-1 to set up all the
// required user defined methods
void vtkMultiThreader::SetMultipleMethod( int index,
vtkThreadFunctionType f, void *data )
{
// You can only set the method for 0 through NumberOfThreads-1
if ( index >= this->NumberOfThreads )
{
vtkErrorMacro( << "Can't set method " << index <<
" with a thread count of " << this->NumberOfThreads );
}
else
{
this->MultipleMethod[index] = f;
this->MultipleData[index] = data;
}
}
// Execute the method set as the SingleMethod on NumberOfThreads threads.
void vtkMultiThreader::SingleMethodExecute()
{
int thread_loop = 0;
#ifdef VTK_USE_WIN32_THREADS
DWORD threadId;
HANDLE process_id[VTK_MAX_THREADS] = {};
#endif
#ifdef VTK_USE_SPROC
siginfo_t info_ptr;
int process_id[VTK_MAX_THREADS] = {};
#endif
#ifdef VTK_USE_PTHREADS
pthread_t process_id[VTK_MAX_THREADS] = {};
#endif
if ( !this->SingleMethod )
{
vtkErrorMacro( << "No single method set!" );
return;
}
// obey the global maximum number of threads limit
if (vtkMultiThreaderGlobalMaximumNumberOfThreads &&
this->NumberOfThreads > vtkMultiThreaderGlobalMaximumNumberOfThreads)
{
this->NumberOfThreads = vtkMultiThreaderGlobalMaximumNumberOfThreads;
}
// We are using sproc (on SGIs), pthreads(on Suns), or a single thread
// (the default)
#ifdef VTK_USE_WIN32_THREADS
// Using CreateThread on a PC
//
// We want to use CreateThread to start this->NumberOfThreads - 1
// additional threads which will be used to call this->SingleMethod().
// The parent thread will also call this routine. When it is done,
// it will wait for all the children to finish.
//
// First, start up the this->NumberOfThreads-1 processes. Keep track
// of their process ids for use later in the waitid call
for (thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
this->ThreadInfoArray[thread_loop].UserData = this->SingleData;
this->ThreadInfoArray[thread_loop].NumberOfThreads = this->NumberOfThreads;
process_id[thread_loop] =
CreateThread(NULL, 0, this->SingleMethod,
((void *)(&this->ThreadInfoArray[thread_loop])), 0, &threadId);
if (process_id[thread_loop] == NULL)
{
vtkErrorMacro("Error in thread creation !!!");
}
}
// Now, the parent thread calls this->SingleMethod() itself
this->ThreadInfoArray[0].UserData = this->SingleData;
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
this->SingleMethod((void *)(&this->ThreadInfoArray[0]));
// The parent thread has finished this->SingleMethod() - so now it
// waits for each of the other processes to exit
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
WaitForSingleObject(process_id[thread_loop], INFINITE);
}
// close the threads
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
CloseHandle(process_id[thread_loop]);
}
#endif
#ifdef VTK_USE_SPROC
// Using sproc() on an SGI
//
// We want to use sproc to start this->NumberOfThreads - 1 additional
// threads which will be used to call this->SingleMethod(). The
// parent thread will also call this routine. When it is done,
// it will wait for all the children to finish.
//
// First, start up the this->NumberOfThreads-1 processes. Keep track
// of their process ids for use later in the waitid call
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
this->ThreadInfoArray[thread_loop].UserData = this->SingleData;
this->ThreadInfoArray[thread_loop].NumberOfThreads = this->NumberOfThreads;
process_id[thread_loop] =
sproc( this->SingleMethod, PR_SADDR,
( (void *)(&this->ThreadInfoArray[thread_loop]) ) );
if ( process_id[thread_loop] == -1)
{
vtkErrorMacro("sproc call failed. Code: " << errno << endl);
}
}
// Now, the parent thread calls this->SingleMethod() itself
this->ThreadInfoArray[0].UserData = this->SingleData;
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
this->SingleMethod((void *)(&this->ThreadInfoArray[0]) );
// The parent thread has finished this->SingleMethod() - so now it
// waits for each of the other processes to exit
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
waitid( P_PID, (id_t) process_id[thread_loop], &info_ptr, WEXITED );
}
#endif
#ifdef VTK_USE_PTHREADS
// Using POSIX threads
//
// We want to use pthread_create to start this->NumberOfThreads-1 additional
// threads which will be used to call this->SingleMethod(). The
// parent thread will also call this routine. When it is done,
// it will wait for all the children to finish.
//
// First, start up the this->NumberOfThreads-1 processes. Keep track
// of their process ids for use later in the pthread_join call
pthread_attr_t attr;
#ifdef VTK_HP_PTHREADS
pthread_attr_create( &attr );
#else
pthread_attr_init(&attr);
#if !defined(__CYGWIN__)
pthread_attr_setscope(&attr, PTHREAD_SCOPE_PROCESS);
#endif
#endif
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
this->ThreadInfoArray[thread_loop].UserData = this->SingleData;
this->ThreadInfoArray[thread_loop].NumberOfThreads = this->NumberOfThreads;
#ifdef VTK_HP_PTHREADS
pthread_create( &(process_id[thread_loop]),
attr, this->SingleMethod,
( (void *)(&this->ThreadInfoArray[thread_loop]) ) );
#else
int threadError;
threadError =
pthread_create( &(process_id[thread_loop]), &attr,
reinterpret_cast<vtkExternCThreadFunctionType>(
this->SingleMethod),
( (void *)(&this->ThreadInfoArray[thread_loop]) ) );
if (threadError != 0)
{
vtkErrorMacro(<< "Unable to create a thread. pthread_create() returned "
<< threadError);
}
#endif
}
// Now, the parent thread calls this->SingleMethod() itself
this->ThreadInfoArray[0].UserData = this->SingleData;
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
this->SingleMethod((void *)(&this->ThreadInfoArray[0]) );
// The parent thread has finished this->SingleMethod() - so now it
// waits for each of the other processes to exit
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
pthread_join( process_id[thread_loop], NULL );
}
#endif
#ifndef VTK_USE_WIN32_THREADS
#ifndef VTK_USE_SPROC
#ifndef VTK_USE_PTHREADS
// There is no multi threading, so there is only one thread.
this->ThreadInfoArray[0].UserData = this->SingleData;
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
this->SingleMethod( (void *)(&this->ThreadInfoArray[0]) );
#endif
#endif
#endif
}
void vtkMultiThreader::MultipleMethodExecute()
{
int thread_loop;
#ifdef VTK_USE_WIN32_THREADS
DWORD threadId;
HANDLE process_id[VTK_MAX_THREADS] = {};
#endif
#ifdef VTK_USE_SPROC
siginfo_t info_ptr;
int process_id[VTK_MAX_THREADS] = {};
#endif
#ifdef VTK_USE_PTHREADS
pthread_t process_id[VTK_MAX_THREADS] = {};
#endif
// obey the global maximum number of threads limit
if (vtkMultiThreaderGlobalMaximumNumberOfThreads &&
this->NumberOfThreads > vtkMultiThreaderGlobalMaximumNumberOfThreads)
{
this->NumberOfThreads = vtkMultiThreaderGlobalMaximumNumberOfThreads;
}
for ( thread_loop = 0; thread_loop < this->NumberOfThreads; thread_loop++ )
{
if ( this->MultipleMethod[thread_loop] == (vtkThreadFunctionType)NULL)
{
vtkErrorMacro( << "No multiple method set for: " << thread_loop );
return;
}
}
// We are using sproc (on SGIs), pthreads(on Suns), CreateThread
// on a PC or a single thread (the default)
#ifdef VTK_USE_WIN32_THREADS
// Using CreateThread on a PC
//
// We want to use CreateThread to start this->NumberOfThreads - 1
// additional threads which will be used to call the NumberOfThreads-1
// methods defined in this->MultipleMethods[](). The parent thread
// will call this->MultipleMethods[NumberOfThreads-1](). When it is done,
// it will wait for all the children to finish.
//
// First, start up the this->NumberOfThreads-1 processes. Keep track
// of their process ids for use later in the waitid call
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
this->ThreadInfoArray[thread_loop].UserData =
this->MultipleData[thread_loop];
this->ThreadInfoArray[thread_loop].NumberOfThreads = this->NumberOfThreads;
process_id[thread_loop] =
CreateThread(NULL, 0, this->MultipleMethod[thread_loop],
((void *)(&this->ThreadInfoArray[thread_loop])), 0, &threadId);
if (process_id[thread_loop] == NULL)
{
vtkErrorMacro("Error in thread creation !!!");
}
}
// Now, the parent thread calls the last method itself
this->ThreadInfoArray[0].UserData = this->MultipleData[0];
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
(this->MultipleMethod[0])((void *)(&this->ThreadInfoArray[0]) );
// The parent thread has finished its method - so now it
// waits for each of the other processes (created with sproc) to
// exit
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
WaitForSingleObject(process_id[thread_loop], INFINITE);
}
// close the threads
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
CloseHandle(process_id[thread_loop]);
}
#endif
#ifdef VTK_USE_SPROC
// Using sproc() on an SGI
//
// We want to use sproc to start this->NumberOfThreads - 1 additional
// threads which will be used to call the NumberOfThreads-1 methods
// defined in this->MultipleMethods[](). The parent thread
// will call this->MultipleMethods[NumberOfThreads-1](). When it is done,
// it will wait for all the children to finish.
//
// First, start up the this->NumberOfThreads-1 processes. Keep track
// of their process ids for use later in the waitid call
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
this->ThreadInfoArray[thread_loop].UserData =
this->MultipleData[thread_loop];
this->ThreadInfoArray[thread_loop].NumberOfThreads = this->NumberOfThreads;
process_id[thread_loop] =
sproc( this->MultipleMethod[thread_loop], PR_SADDR,
( (void *)(&this->ThreadInfoArray[thread_loop]) ) );
}
// Now, the parent thread calls the last method itself
this->ThreadInfoArray[0].UserData = this->MultipleData[0];
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
(this->MultipleMethod[0])((void *)(&this->ThreadInfoArray[0]) );
// The parent thread has finished its method - so now it
// waits for each of the other processes (created with sproc) to
// exit
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
waitid( P_PID, (id_t) process_id[thread_loop], &info_ptr, WEXITED );
}
#endif
#ifdef VTK_USE_PTHREADS
// Using POSIX threads
//
// We want to use pthread_create to start this->NumberOfThreads - 1
// additional
// threads which will be used to call the NumberOfThreads-1 methods
// defined in this->MultipleMethods[](). The parent thread
// will call this->MultipleMethods[NumberOfThreads-1](). When it is done,
// it will wait for all the children to finish.
//
// First, start up the this->NumberOfThreads-1 processes. Keep track
// of their process ids for use later in the pthread_join call
pthread_attr_t attr;
#ifdef VTK_HP_PTHREADS
pthread_attr_create( &attr );
#else
pthread_attr_init(&attr);
#ifndef __CYGWIN__
pthread_attr_setscope(&attr, PTHREAD_SCOPE_PROCESS);
#endif
#endif
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
this->ThreadInfoArray[thread_loop].UserData =
this->MultipleData[thread_loop];
this->ThreadInfoArray[thread_loop].NumberOfThreads = this->NumberOfThreads;
#ifdef VTK_HP_PTHREADS
pthread_create( &(process_id[thread_loop]),
attr, this->MultipleMethod[thread_loop],
( (void *)(&this->ThreadInfoArray[thread_loop]) ) );
#else
pthread_create( &(process_id[thread_loop]),
&attr,
reinterpret_cast<vtkExternCThreadFunctionType>(
this->MultipleMethod[thread_loop]),
( (void *)(&this->ThreadInfoArray[thread_loop]) ) );
#endif
}
// Now, the parent thread calls the last method itself
this->ThreadInfoArray[0].UserData = this->MultipleData[0];
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
(this->MultipleMethod[0])((void *)(&this->ThreadInfoArray[0]) );
// The parent thread has finished its method - so now it
// waits for each of the other processes to exit
for ( thread_loop = 1; thread_loop < this->NumberOfThreads; thread_loop++ )
{
pthread_join( process_id[thread_loop], NULL );
}
#endif
#ifndef VTK_USE_WIN32_THREADS
#ifndef VTK_USE_SPROC
#ifndef VTK_USE_PTHREADS
// There is no multi threading, so there is only one thread.
this->ThreadInfoArray[0].UserData = this->MultipleData[0];
this->ThreadInfoArray[0].NumberOfThreads = this->NumberOfThreads;
(this->MultipleMethod[0])( (void *)(&this->ThreadInfoArray[0]) );
#endif
#endif
#endif
}
int vtkMultiThreader::SpawnThread( vtkThreadFunctionType f, void *userdata )
{
int id;
#ifdef VTK_USE_WIN32_THREADS
DWORD threadId;
#endif
for ( id = 0; id < VTK_MAX_THREADS; id++ )
{
if ( this->SpawnedThreadActiveFlagLock[id] == NULL )
{
this->SpawnedThreadActiveFlagLock[id] = vtkMutexLock::New();
}
this->SpawnedThreadActiveFlagLock[id]->Lock();
if (this->SpawnedThreadActiveFlag[id] == 0)
{
// We've got a useable thread id, so grab it
this->SpawnedThreadActiveFlag[id] = 1;
this->SpawnedThreadActiveFlagLock[id]->Unlock();
break;
}
this->SpawnedThreadActiveFlagLock[id]->Unlock();
}
if ( id >= VTK_MAX_THREADS )
{
vtkErrorMacro( << "You have too many active threads!" );
return -1;
}
this->SpawnedThreadInfoArray[id].UserData = userdata;
this->SpawnedThreadInfoArray[id].NumberOfThreads = 1;
this->SpawnedThreadInfoArray[id].ActiveFlag =
&this->SpawnedThreadActiveFlag[id];
this->SpawnedThreadInfoArray[id].ActiveFlagLock =
this->SpawnedThreadActiveFlagLock[id];
// We are using sproc (on SGIs), pthreads(on Suns or HPs),
// CreateThread (on win32), or generating an error
#ifdef VTK_USE_WIN32_THREADS
// Using CreateThread on a PC
//
this->SpawnedThreadProcessID[id] =
CreateThread(NULL, 0, f,
((void *)(&this->SpawnedThreadInfoArray[id])), 0, &threadId);
if (this->SpawnedThreadProcessID[id] == NULL)
{
vtkErrorMacro("Error in thread creation !!!");
}
#endif
#ifdef VTK_USE_SPROC
// Using sproc() on an SGI
//
this->SpawnedThreadProcessID[id] =
sproc( f, PR_SADDR, ( (void *)(&this->SpawnedThreadInfoArray[id]) ) );
#endif
#ifdef VTK_USE_PTHREADS
// Using POSIX threads
//
pthread_attr_t attr;
#ifdef VTK_HP_PTHREADS
pthread_attr_create( &attr );
#else
pthread_attr_init(&attr);
#ifndef __CYGWIN__
pthread_attr_setscope(&attr, PTHREAD_SCOPE_PROCESS);
#endif
#endif
#ifdef VTK_HP_PTHREADS
pthread_create( &(this->SpawnedThreadProcessID[id]),
attr, f,
( (void *)(&this->SpawnedThreadInfoArray[id]) ) );
#else
pthread_create( &(this->SpawnedThreadProcessID[id]),
&attr,
reinterpret_cast<vtkExternCThreadFunctionType>(f),
( (void *)(&this->SpawnedThreadInfoArray[id]) ) );
#endif
#endif
#ifndef VTK_USE_WIN32_THREADS
#ifndef VTK_USE_SPROC
#ifndef VTK_USE_PTHREADS
// There is no multi threading, so there is only one thread.
// This won't work - so give an error message.
vtkErrorMacro( << "Cannot spawn thread in a single threaded environment!" );
this->SpawnedThreadActiveFlagLock[id]->Delete();
id = -1;
#endif
#endif
#endif
return id;
}
void vtkMultiThreader::TerminateThread( int threadID )
{
// check if the threadID argument is in range
if ( threadID >= VTK_MAX_THREADS )
{
vtkErrorMacro("ThreadID is out of range. Must be less that " << VTK_MAX_THREADS );
return;
}
// If we don't have a lock, then this thread is definitely not active
if ( !this->SpawnedThreadActiveFlag[threadID] )
{
return;
}
// If we do have a lock, use it and find out the status of the active flag
this->SpawnedThreadActiveFlagLock[threadID]->Lock();
int val = this->SpawnedThreadActiveFlag[threadID];
this->SpawnedThreadActiveFlagLock[threadID]->Unlock();
// If the active flag is 0, return since this thread is not active
if ( val == 0 )
{
return;
}
// OK - now we know we have an active thread - set the active flag to 0
// to indicate to the thread that it should terminate itself
this->SpawnedThreadActiveFlagLock[threadID]->Lock();
this->SpawnedThreadActiveFlag[threadID] = 0;
this->SpawnedThreadActiveFlagLock[threadID]->Unlock();
#ifdef VTK_USE_WIN32_THREADS
WaitForSingleObject(this->SpawnedThreadProcessID[threadID], INFINITE);
CloseHandle(this->SpawnedThreadProcessID[threadID]);
#endif
#ifdef VTK_USE_SPROC
siginfo_t info_ptr;
waitid( P_PID, (id_t) this->SpawnedThreadProcessID[threadID],
&info_ptr, WEXITED );
#endif
#ifdef VTK_USE_PTHREADS
pthread_join( this->SpawnedThreadProcessID[threadID], NULL );
#endif
#ifndef VTK_USE_WIN32_THREADS
#ifndef VTK_USE_SPROC
#ifndef VTK_USE_PTHREADS
// There is no multi threading, so there is only one thread.
// This won't work - so give an error message.
vtkErrorMacro(<< "Cannot terminate thread in single threaded environment!");
#endif
#endif
#endif
this->SpawnedThreadActiveFlagLock[threadID]->Delete();
this->SpawnedThreadActiveFlagLock[threadID] = NULL;
}
//----------------------------------------------------------------------------
vtkMultiThreaderIDType vtkMultiThreader::GetCurrentThreadID()
{
#if defined(VTK_USE_PTHREADS)
return pthread_self();
#elif defined(VTK_USE_WIN32_THREADS)
return GetCurrentThreadId();
#elif defined(VTK_USE_SPROC)
return getpid();
#else
// No threading implementation. Assume all callers are in the same
// thread.
return 0;
#endif
}
int vtkMultiThreader::IsThreadActive( int threadID )
{
// check if the threadID argument is in range
if ( threadID >= VTK_MAX_THREADS )
{
vtkErrorMacro("ThreadID is out of range. Must be less that " << VTK_MAX_THREADS );
return 0;
}
// If we don't have a lock, then this thread is not active
if ( this->SpawnedThreadActiveFlagLock[threadID] == NULL )
{
return 0;
}
// We have a lock - use it to get the active flag value
this->SpawnedThreadActiveFlagLock[threadID]->Lock();
int val = this->SpawnedThreadActiveFlag[threadID];
this->SpawnedThreadActiveFlagLock[threadID]->Unlock();
// now return that value
return val;
}
//----------------------------------------------------------------------------
int vtkMultiThreader::ThreadsEqual(vtkMultiThreaderIDType t1,
vtkMultiThreaderIDType t2)
{
#if defined(VTK_USE_PTHREADS)
return pthread_equal(t1, t2) != 0;
#elif defined(VTK_USE_WIN32_THREADS)
return t1 == t2;
#elif defined(VTK_USE_SPROC)
return t1 == t2;
#else
// No threading implementation. Assume all callers are in the same
// thread.
return 1;
#endif
}
// Print method for the multithreader
void vtkMultiThreader::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Thread Count: " << this->NumberOfThreads << "\n";
os << indent << "Global Maximum Number Of Threads: " <<
vtkMultiThreaderGlobalMaximumNumberOfThreads << endl;
os << "Thread system used: " <<
#ifdef VTK_USE_PTHREADS
"PTHREADS"
#elif defined VTK_USE_SPROC
"SPROC"
#elif defined VTK_USE_WIN32_THREADS
"WIN32 Threads"
#elif defined VTK_HP_PTHREADS
"HP PThreads"
#else
"NO THREADS SUPPORT"
#endif
<< endl;
}
|