| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/msw/thread.cpp |
| 3 | // Purpose: wxThread Implementation |
| 4 | // Author: Original from Wolfram Gloger/Guilhem Lavaux |
| 5 | // Modified by: Vadim Zeitlin to make it work :-) |
| 6 | // Created: 04/22/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Wolfram Gloger (1996, 1997), Guilhem Lavaux (1998); |
| 9 | // Vadim Zeitlin (1999-2002) |
| 10 | // Licence: wxWindows licence |
| 11 | ///////////////////////////////////////////////////////////////////////////// |
| 12 | |
| 13 | #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) |
| 14 | #pragma implementation "thread.h" |
| 15 | #endif |
| 16 | |
| 17 | // ---------------------------------------------------------------------------- |
| 18 | // headers |
| 19 | // ---------------------------------------------------------------------------- |
| 20 | |
| 21 | // For compilers that support precompilation, includes "wx.h". |
| 22 | #include "wx/wxprec.h" |
| 23 | |
| 24 | #if defined(__BORLANDC__) |
| 25 | #pragma hdrstop |
| 26 | #endif |
| 27 | |
| 28 | #ifndef WX_PRECOMP |
| 29 | #include "wx/intl.h" |
| 30 | #include "wx/app.h" |
| 31 | #endif |
| 32 | |
| 33 | #if wxUSE_THREADS |
| 34 | |
| 35 | #include "wx/apptrait.h" |
| 36 | |
| 37 | #include "wx/msw/private.h" |
| 38 | #include "wx/msw/missing.h" |
| 39 | |
| 40 | #include "wx/module.h" |
| 41 | #include "wx/thread.h" |
| 42 | |
| 43 | // must have this symbol defined to get _beginthread/_endthread declarations |
| 44 | #ifndef _MT |
| 45 | #define _MT |
| 46 | #endif |
| 47 | |
| 48 | #if defined(__BORLANDC__) |
| 49 | #if !defined(__MT__) |
| 50 | // I can't set -tWM in the IDE (anyone?) so have to do this |
| 51 | #define __MT__ |
| 52 | #endif |
| 53 | |
| 54 | #if !defined(__MFC_COMPAT__) |
| 55 | // Needed to know about _beginthreadex etc.. |
| 56 | #define __MFC_COMPAT__ |
| 57 | #endif |
| 58 | #endif // BC++ |
| 59 | |
| 60 | // define wxUSE_BEGIN_THREAD if the compiler has _beginthreadex() function |
| 61 | // which should be used instead of Win32 ::CreateThread() if possible |
| 62 | #if defined(__VISUALC__) || \ |
| 63 | (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \ |
| 64 | (defined(__GNUG__) && defined(__MSVCRT__)) || \ |
| 65 | defined(__WATCOMC__) || defined(__MWERKS__) |
| 66 | |
| 67 | #ifndef __WXWINCE__ |
| 68 | #undef wxUSE_BEGIN_THREAD |
| 69 | #define wxUSE_BEGIN_THREAD |
| 70 | #endif |
| 71 | |
| 72 | #endif |
| 73 | |
| 74 | #ifdef wxUSE_BEGIN_THREAD |
| 75 | // this is where _beginthreadex() is declared |
| 76 | #include <process.h> |
| 77 | |
| 78 | // the return type of the thread function entry point |
| 79 | typedef unsigned THREAD_RETVAL; |
| 80 | |
| 81 | // the calling convention of the thread function entry point |
| 82 | #define THREAD_CALLCONV __stdcall |
| 83 | #else |
| 84 | // the settings for CreateThread() |
| 85 | typedef DWORD THREAD_RETVAL; |
| 86 | #define THREAD_CALLCONV WINAPI |
| 87 | #endif |
| 88 | |
| 89 | // ---------------------------------------------------------------------------- |
| 90 | // constants |
| 91 | // ---------------------------------------------------------------------------- |
| 92 | |
| 93 | // the possible states of the thread ("=>" shows all possible transitions from |
| 94 | // this state) |
| 95 | enum wxThreadState |
| 96 | { |
| 97 | STATE_NEW, // didn't start execution yet (=> RUNNING) |
| 98 | STATE_RUNNING, // thread is running (=> PAUSED, CANCELED) |
| 99 | STATE_PAUSED, // thread is temporarily suspended (=> RUNNING) |
| 100 | STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED) |
| 101 | STATE_EXITED // thread is terminating |
| 102 | }; |
| 103 | |
| 104 | // ---------------------------------------------------------------------------- |
| 105 | // this module globals |
| 106 | // ---------------------------------------------------------------------------- |
| 107 | |
| 108 | // TLS index of the slot where we store the pointer to the current thread |
| 109 | static DWORD gs_tlsThisThread = 0xFFFFFFFF; |
| 110 | |
| 111 | // id of the main thread - the one which can call GUI functions without first |
| 112 | // calling wxMutexGuiEnter() |
| 113 | static DWORD gs_idMainThread = 0; |
| 114 | |
| 115 | // if it's false, some secondary thread is holding the GUI lock |
| 116 | static bool gs_bGuiOwnedByMainThread = true; |
| 117 | |
| 118 | // critical section which controls access to all GUI functions: any secondary |
| 119 | // thread (i.e. except the main one) must enter this crit section before doing |
| 120 | // any GUI calls |
| 121 | static wxCriticalSection *gs_critsectGui = NULL; |
| 122 | |
| 123 | // critical section which protects gs_nWaitingForGui variable |
| 124 | static wxCriticalSection *gs_critsectWaitingForGui = NULL; |
| 125 | |
| 126 | // critical section which serializes WinThreadStart() and WaitForTerminate() |
| 127 | // (this is a potential bottleneck, we use a single crit sect for all threads |
| 128 | // in the system, but normally time spent inside it should be quite short) |
| 129 | static wxCriticalSection *gs_critsectThreadDelete = NULL; |
| 130 | |
| 131 | // number of threads waiting for GUI in wxMutexGuiEnter() |
| 132 | static size_t gs_nWaitingForGui = 0; |
| 133 | |
| 134 | // are we waiting for a thread termination? |
| 135 | static bool gs_waitingForThread = false; |
| 136 | |
| 137 | // ============================================================================ |
| 138 | // Windows implementation of thread and related classes |
| 139 | // ============================================================================ |
| 140 | |
| 141 | // ---------------------------------------------------------------------------- |
| 142 | // wxCriticalSection |
| 143 | // ---------------------------------------------------------------------------- |
| 144 | |
| 145 | wxCriticalSection::wxCriticalSection() |
| 146 | { |
| 147 | wxCOMPILE_TIME_ASSERT( sizeof(CRITICAL_SECTION) <= sizeof(wxCritSectBuffer), |
| 148 | wxCriticalSectionBufferTooSmall ); |
| 149 | |
| 150 | ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer); |
| 151 | } |
| 152 | |
| 153 | wxCriticalSection::~wxCriticalSection() |
| 154 | { |
| 155 | ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer); |
| 156 | } |
| 157 | |
| 158 | void wxCriticalSection::Enter() |
| 159 | { |
| 160 | ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer); |
| 161 | } |
| 162 | |
| 163 | void wxCriticalSection::Leave() |
| 164 | { |
| 165 | ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer); |
| 166 | } |
| 167 | |
| 168 | // ---------------------------------------------------------------------------- |
| 169 | // wxMutex |
| 170 | // ---------------------------------------------------------------------------- |
| 171 | |
| 172 | class wxMutexInternal |
| 173 | { |
| 174 | public: |
| 175 | wxMutexInternal(wxMutexType mutexType); |
| 176 | ~wxMutexInternal(); |
| 177 | |
| 178 | bool IsOk() const { return m_mutex != NULL; } |
| 179 | |
| 180 | wxMutexError Lock() { return LockTimeout(INFINITE); } |
| 181 | wxMutexError TryLock() { return LockTimeout(0); } |
| 182 | wxMutexError Unlock(); |
| 183 | |
| 184 | private: |
| 185 | wxMutexError LockTimeout(DWORD milliseconds); |
| 186 | |
| 187 | HANDLE m_mutex; |
| 188 | |
| 189 | DECLARE_NO_COPY_CLASS(wxMutexInternal) |
| 190 | }; |
| 191 | |
| 192 | // all mutexes are recursive under Win32 so we don't use mutexType |
| 193 | wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(mutexType)) |
| 194 | { |
| 195 | // create a nameless (hence intra process and always private) mutex |
| 196 | m_mutex = ::CreateMutex |
| 197 | ( |
| 198 | NULL, // default secutiry attributes |
| 199 | false, // not initially locked |
| 200 | NULL // no name |
| 201 | ); |
| 202 | |
| 203 | if ( !m_mutex ) |
| 204 | { |
| 205 | wxLogLastError(_T("CreateMutex()")); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | wxMutexInternal::~wxMutexInternal() |
| 210 | { |
| 211 | if ( m_mutex ) |
| 212 | { |
| 213 | if ( !::CloseHandle(m_mutex) ) |
| 214 | { |
| 215 | wxLogLastError(_T("CloseHandle(mutex)")); |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds) |
| 221 | { |
| 222 | DWORD rc = ::WaitForSingleObject(m_mutex, milliseconds); |
| 223 | if ( rc == WAIT_ABANDONED ) |
| 224 | { |
| 225 | // the previous caller died without releasing the mutex, but now we can |
| 226 | // really lock it |
| 227 | wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED")); |
| 228 | |
| 229 | // use 0 timeout, normally we should always get it |
| 230 | rc = ::WaitForSingleObject(m_mutex, 0); |
| 231 | } |
| 232 | |
| 233 | switch ( rc ) |
| 234 | { |
| 235 | case WAIT_OBJECT_0: |
| 236 | // ok |
| 237 | break; |
| 238 | |
| 239 | case WAIT_TIMEOUT: |
| 240 | return wxMUTEX_BUSY; |
| 241 | |
| 242 | case WAIT_ABANDONED: // checked for above |
| 243 | default: |
| 244 | wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock")); |
| 245 | // fall through |
| 246 | |
| 247 | case WAIT_FAILED: |
| 248 | wxLogLastError(_T("WaitForSingleObject(mutex)")); |
| 249 | return wxMUTEX_MISC_ERROR; |
| 250 | } |
| 251 | |
| 252 | return wxMUTEX_NO_ERROR; |
| 253 | } |
| 254 | |
| 255 | wxMutexError wxMutexInternal::Unlock() |
| 256 | { |
| 257 | if ( !::ReleaseMutex(m_mutex) ) |
| 258 | { |
| 259 | wxLogLastError(_T("ReleaseMutex()")); |
| 260 | |
| 261 | return wxMUTEX_MISC_ERROR; |
| 262 | } |
| 263 | |
| 264 | return wxMUTEX_NO_ERROR; |
| 265 | } |
| 266 | |
| 267 | // -------------------------------------------------------------------------- |
| 268 | // wxSemaphore |
| 269 | // -------------------------------------------------------------------------- |
| 270 | |
| 271 | // a trivial wrapper around Win32 semaphore |
| 272 | class wxSemaphoreInternal |
| 273 | { |
| 274 | public: |
| 275 | wxSemaphoreInternal(int initialcount, int maxcount); |
| 276 | ~wxSemaphoreInternal(); |
| 277 | |
| 278 | bool IsOk() const { return m_semaphore != NULL; } |
| 279 | |
| 280 | wxSemaError Wait() { return WaitTimeout(INFINITE); } |
| 281 | |
| 282 | wxSemaError TryWait() |
| 283 | { |
| 284 | wxSemaError rc = WaitTimeout(0); |
| 285 | if ( rc == wxSEMA_TIMEOUT ) |
| 286 | rc = wxSEMA_BUSY; |
| 287 | |
| 288 | return rc; |
| 289 | } |
| 290 | |
| 291 | wxSemaError WaitTimeout(unsigned long milliseconds); |
| 292 | |
| 293 | wxSemaError Post(); |
| 294 | |
| 295 | private: |
| 296 | HANDLE m_semaphore; |
| 297 | |
| 298 | DECLARE_NO_COPY_CLASS(wxSemaphoreInternal) |
| 299 | }; |
| 300 | |
| 301 | wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) |
| 302 | { |
| 303 | #ifndef __WXWINCE__ |
| 304 | if ( maxcount == 0 ) |
| 305 | { |
| 306 | // make it practically infinite |
| 307 | maxcount = INT_MAX; |
| 308 | } |
| 309 | |
| 310 | m_semaphore = ::CreateSemaphore |
| 311 | ( |
| 312 | NULL, // default security attributes |
| 313 | initialcount, |
| 314 | maxcount, |
| 315 | NULL // no name |
| 316 | ); |
| 317 | #endif |
| 318 | if ( !m_semaphore ) |
| 319 | { |
| 320 | wxLogLastError(_T("CreateSemaphore()")); |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | wxSemaphoreInternal::~wxSemaphoreInternal() |
| 325 | { |
| 326 | if ( m_semaphore ) |
| 327 | { |
| 328 | if ( !::CloseHandle(m_semaphore) ) |
| 329 | { |
| 330 | wxLogLastError(_T("CloseHandle(semaphore)")); |
| 331 | } |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) |
| 336 | { |
| 337 | DWORD rc = ::WaitForSingleObject( m_semaphore, milliseconds ); |
| 338 | |
| 339 | switch ( rc ) |
| 340 | { |
| 341 | case WAIT_OBJECT_0: |
| 342 | return wxSEMA_NO_ERROR; |
| 343 | |
| 344 | case WAIT_TIMEOUT: |
| 345 | return wxSEMA_TIMEOUT; |
| 346 | |
| 347 | default: |
| 348 | wxLogLastError(_T("WaitForSingleObject(semaphore)")); |
| 349 | } |
| 350 | |
| 351 | return wxSEMA_MISC_ERROR; |
| 352 | } |
| 353 | |
| 354 | wxSemaError wxSemaphoreInternal::Post() |
| 355 | { |
| 356 | #ifndef __WXWINCE__ |
| 357 | if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) ) |
| 358 | #endif |
| 359 | { |
| 360 | wxLogLastError(_T("ReleaseSemaphore")); |
| 361 | |
| 362 | return wxSEMA_MISC_ERROR; |
| 363 | } |
| 364 | |
| 365 | return wxSEMA_NO_ERROR; |
| 366 | } |
| 367 | |
| 368 | // ---------------------------------------------------------------------------- |
| 369 | // wxThread implementation |
| 370 | // ---------------------------------------------------------------------------- |
| 371 | |
| 372 | // wxThreadInternal class |
| 373 | // ---------------------- |
| 374 | |
| 375 | class wxThreadInternal |
| 376 | { |
| 377 | public: |
| 378 | wxThreadInternal(wxThread *thread) |
| 379 | { |
| 380 | m_thread = thread; |
| 381 | m_hThread = 0; |
| 382 | m_state = STATE_NEW; |
| 383 | m_priority = WXTHREAD_DEFAULT_PRIORITY; |
| 384 | m_nRef = 1; |
| 385 | } |
| 386 | |
| 387 | ~wxThreadInternal() |
| 388 | { |
| 389 | Free(); |
| 390 | } |
| 391 | |
| 392 | void Free() |
| 393 | { |
| 394 | if ( m_hThread ) |
| 395 | { |
| 396 | if ( !::CloseHandle(m_hThread) ) |
| 397 | { |
| 398 | wxLogLastError(wxT("CloseHandle(thread)")); |
| 399 | } |
| 400 | |
| 401 | m_hThread = 0; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | // create a new (suspended) thread (for the given thread object) |
| 406 | bool Create(wxThread *thread, unsigned int stackSize); |
| 407 | |
| 408 | // wait for the thread to terminate, either by itself, or by asking it |
| 409 | // (politely, this is not Kill()!) to do it |
| 410 | wxThreadError WaitForTerminate(wxCriticalSection& cs, |
| 411 | wxThread::ExitCode *pRc, |
| 412 | wxThread *threadToDelete = NULL); |
| 413 | |
| 414 | // kill the thread unconditionally |
| 415 | wxThreadError Kill(); |
| 416 | |
| 417 | // suspend/resume/terminate |
| 418 | bool Suspend(); |
| 419 | bool Resume(); |
| 420 | void Cancel() { m_state = STATE_CANCELED; } |
| 421 | |
| 422 | // thread state |
| 423 | void SetState(wxThreadState state) { m_state = state; } |
| 424 | wxThreadState GetState() const { return m_state; } |
| 425 | |
| 426 | // thread priority |
| 427 | void SetPriority(unsigned int priority); |
| 428 | unsigned int GetPriority() const { return m_priority; } |
| 429 | |
| 430 | // thread handle and id |
| 431 | HANDLE GetHandle() const { return m_hThread; } |
| 432 | DWORD GetId() const { return m_tid; } |
| 433 | |
| 434 | // thread function |
| 435 | static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread); |
| 436 | |
| 437 | void KeepAlive() |
| 438 | { |
| 439 | if ( m_thread->IsDetached() ) |
| 440 | ::InterlockedIncrement(&m_nRef); |
| 441 | } |
| 442 | |
| 443 | void LetDie() |
| 444 | { |
| 445 | if ( m_thread->IsDetached() && !::InterlockedDecrement(&m_nRef) ) |
| 446 | delete m_thread; |
| 447 | } |
| 448 | |
| 449 | private: |
| 450 | // the thread we're associated with |
| 451 | wxThread *m_thread; |
| 452 | |
| 453 | HANDLE m_hThread; // handle of the thread |
| 454 | wxThreadState m_state; // state, see wxThreadState enum |
| 455 | unsigned int m_priority; // thread priority in "wx" units |
| 456 | DWORD m_tid; // thread id |
| 457 | |
| 458 | // number of threads which need this thread to remain alive, when the count |
| 459 | // reaches 0 we kill the owning wxThread -- and die ourselves with it |
| 460 | LONG m_nRef; |
| 461 | |
| 462 | DECLARE_NO_COPY_CLASS(wxThreadInternal) |
| 463 | }; |
| 464 | |
| 465 | // small class which keeps a thread alive during its lifetime |
| 466 | class wxThreadKeepAlive |
| 467 | { |
| 468 | public: |
| 469 | wxThreadKeepAlive(wxThreadInternal& thrImpl) : m_thrImpl(thrImpl) |
| 470 | { m_thrImpl.KeepAlive(); } |
| 471 | ~wxThreadKeepAlive() |
| 472 | { m_thrImpl.LetDie(); } |
| 473 | |
| 474 | private: |
| 475 | wxThreadInternal& m_thrImpl; |
| 476 | }; |
| 477 | |
| 478 | |
| 479 | THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param) |
| 480 | { |
| 481 | THREAD_RETVAL rc; |
| 482 | |
| 483 | wxThread * const thread = (wxThread *)param; |
| 484 | |
| 485 | // first of all, check whether we hadn't been cancelled already and don't |
| 486 | // start the user code at all then |
| 487 | if ( thread->m_internal->GetState() == STATE_EXITED ) |
| 488 | { |
| 489 | rc = (THREAD_RETVAL)-1; |
| 490 | } |
| 491 | else // do run thread |
| 492 | { |
| 493 | // store the thread object in the TLS |
| 494 | if ( !::TlsSetValue(gs_tlsThisThread, thread) ) |
| 495 | { |
| 496 | wxLogSysError(_("Can not start thread: error writing TLS.")); |
| 497 | |
| 498 | return (DWORD)-1; |
| 499 | } |
| 500 | |
| 501 | rc = (THREAD_RETVAL)thread->Entry(); |
| 502 | |
| 503 | // enter m_critsect before changing the thread state |
| 504 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 505 | |
| 506 | thread->m_internal->SetState(STATE_EXITED); |
| 507 | } |
| 508 | |
| 509 | thread->OnExit(); |
| 510 | |
| 511 | // the thread may delete itself now if it wants, we don't need it any more |
| 512 | thread->m_internal->LetDie(); |
| 513 | |
| 514 | return rc; |
| 515 | } |
| 516 | |
| 517 | void wxThreadInternal::SetPriority(unsigned int priority) |
| 518 | { |
| 519 | m_priority = priority; |
| 520 | |
| 521 | // translate wxWindows priority to the Windows one |
| 522 | int win_priority; |
| 523 | if (m_priority <= 20) |
| 524 | win_priority = THREAD_PRIORITY_LOWEST; |
| 525 | else if (m_priority <= 40) |
| 526 | win_priority = THREAD_PRIORITY_BELOW_NORMAL; |
| 527 | else if (m_priority <= 60) |
| 528 | win_priority = THREAD_PRIORITY_NORMAL; |
| 529 | else if (m_priority <= 80) |
| 530 | win_priority = THREAD_PRIORITY_ABOVE_NORMAL; |
| 531 | else if (m_priority <= 100) |
| 532 | win_priority = THREAD_PRIORITY_HIGHEST; |
| 533 | else |
| 534 | { |
| 535 | wxFAIL_MSG(wxT("invalid value of thread priority parameter")); |
| 536 | win_priority = THREAD_PRIORITY_NORMAL; |
| 537 | } |
| 538 | |
| 539 | if ( !::SetThreadPriority(m_hThread, win_priority) ) |
| 540 | { |
| 541 | wxLogSysError(_("Can't set thread priority")); |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize) |
| 546 | { |
| 547 | wxASSERT_MSG( m_state == STATE_NEW && !m_hThread, |
| 548 | _T("Create()ing thread twice?") ); |
| 549 | |
| 550 | // for compilers which have it, we should use C RTL function for thread |
| 551 | // creation instead of Win32 API one because otherwise we will have memory |
| 552 | // leaks if the thread uses C RTL (and most threads do) |
| 553 | #ifdef wxUSE_BEGIN_THREAD |
| 554 | |
| 555 | // Watcom is reported to not like 0 stack size (which means "use default" |
| 556 | // for the other compilers and is also the default value for stackSize) |
| 557 | #ifdef __WATCOMC__ |
| 558 | if ( !stackSize ) |
| 559 | stackSize = 10240; |
| 560 | #endif // __WATCOMC__ |
| 561 | |
| 562 | m_hThread = (HANDLE)_beginthreadex |
| 563 | ( |
| 564 | NULL, // default security |
| 565 | stackSize, |
| 566 | wxThreadInternal::WinThreadStart, // entry point |
| 567 | thread, |
| 568 | CREATE_SUSPENDED, |
| 569 | (unsigned int *)&m_tid |
| 570 | ); |
| 571 | #else // compiler doesn't have _beginthreadex |
| 572 | m_hThread = ::CreateThread |
| 573 | ( |
| 574 | NULL, // default security |
| 575 | stackSize, // stack size |
| 576 | wxThreadInternal::WinThreadStart, // thread entry point |
| 577 | (LPVOID)thread, // parameter |
| 578 | CREATE_SUSPENDED, // flags |
| 579 | &m_tid // [out] thread id |
| 580 | ); |
| 581 | #endif // _beginthreadex/CreateThread |
| 582 | |
| 583 | if ( m_hThread == NULL ) |
| 584 | { |
| 585 | wxLogSysError(_("Can't create thread")); |
| 586 | |
| 587 | return false; |
| 588 | } |
| 589 | |
| 590 | if ( m_priority != WXTHREAD_DEFAULT_PRIORITY ) |
| 591 | { |
| 592 | SetPriority(m_priority); |
| 593 | } |
| 594 | |
| 595 | return true; |
| 596 | } |
| 597 | |
| 598 | wxThreadError wxThreadInternal::Kill() |
| 599 | { |
| 600 | if ( !::TerminateThread(m_hThread, (DWORD)-1) ) |
| 601 | { |
| 602 | wxLogSysError(_("Couldn't terminate thread")); |
| 603 | |
| 604 | return wxTHREAD_MISC_ERROR; |
| 605 | } |
| 606 | |
| 607 | Free(); |
| 608 | |
| 609 | return wxTHREAD_NO_ERROR; |
| 610 | } |
| 611 | |
| 612 | wxThreadError |
| 613 | wxThreadInternal::WaitForTerminate(wxCriticalSection& cs, |
| 614 | wxThread::ExitCode *pRc, |
| 615 | wxThread *threadToDelete) |
| 616 | { |
| 617 | // prevent the thread C++ object from disappearing as long as we are using |
| 618 | // it here |
| 619 | wxThreadKeepAlive keepAlive(*this); |
| 620 | |
| 621 | |
| 622 | // we may either wait passively for the thread to terminate (when called |
| 623 | // from Wait()) or ask it to terminate (when called from Delete()) |
| 624 | bool shouldDelete = threadToDelete != NULL; |
| 625 | |
| 626 | wxThread::ExitCode rc = 0; |
| 627 | |
| 628 | // Delete() is always safe to call, so consider all possible states |
| 629 | |
| 630 | // we might need to resume the thread, but we might also not need to cancel |
| 631 | // it if it doesn't run yet |
| 632 | bool shouldResume = false, |
| 633 | isRunning = false; |
| 634 | |
| 635 | // check if the thread already started to run |
| 636 | { |
| 637 | wxCriticalSectionLocker lock(cs); |
| 638 | |
| 639 | if ( m_state == STATE_NEW ) |
| 640 | { |
| 641 | if ( shouldDelete ) |
| 642 | { |
| 643 | // WinThreadStart() will see it and terminate immediately, no |
| 644 | // need to cancel the thread -- but we still need to resume it |
| 645 | // to let it run |
| 646 | m_state = STATE_EXITED; |
| 647 | |
| 648 | Resume(); // it knows about STATE_EXITED special case |
| 649 | |
| 650 | shouldDelete = false; |
| 651 | } |
| 652 | |
| 653 | isRunning = true; |
| 654 | |
| 655 | // shouldResume is correctly set to false here |
| 656 | } |
| 657 | else if ( m_state == STATE_EXITED ) |
| 658 | { |
| 659 | return wxTHREAD_NOT_RUNNING; |
| 660 | } |
| 661 | else // running (but maybe paused or cancelled) |
| 662 | { |
| 663 | shouldResume = m_state == STATE_PAUSED; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | // resume the thread if it is paused |
| 668 | if ( shouldResume ) |
| 669 | Resume(); |
| 670 | |
| 671 | // is it still running? |
| 672 | if ( isRunning || m_state == STATE_RUNNING ) |
| 673 | { |
| 674 | if ( wxThread::IsMain() ) |
| 675 | { |
| 676 | // set flag for wxIsWaitingForThread() |
| 677 | gs_waitingForThread = true; |
| 678 | } |
| 679 | |
| 680 | // ask the thread to terminate |
| 681 | if ( shouldDelete ) |
| 682 | { |
| 683 | wxCriticalSectionLocker lock(cs); |
| 684 | |
| 685 | Cancel(); |
| 686 | } |
| 687 | |
| 688 | // we can't just wait for the thread to terminate because it might be |
| 689 | // calling some GUI functions and so it will never terminate before we |
| 690 | // process the Windows messages that result from these functions |
| 691 | // (note that even in console applications we might have to process |
| 692 | // messages if we use wxExecute() or timers or ...) |
| 693 | DWORD result wxDUMMY_INITIALIZE(0); |
| 694 | do |
| 695 | { |
| 696 | if ( wxThread::IsMain() ) |
| 697 | { |
| 698 | // give the thread we're waiting for chance to do the GUI call |
| 699 | // it might be in |
| 700 | if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() ) |
| 701 | { |
| 702 | wxMutexGuiLeave(); |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | result = ::MsgWaitForMultipleObjects |
| 707 | ( |
| 708 | 1, // number of objects to wait for |
| 709 | &m_hThread, // the objects |
| 710 | false, // don't wait for all objects |
| 711 | INFINITE, // no timeout |
| 712 | QS_ALLINPUT | // return as soon as there are any events |
| 713 | QS_ALLPOSTMESSAGE |
| 714 | ); |
| 715 | |
| 716 | switch ( result ) |
| 717 | { |
| 718 | case 0xFFFFFFFF: |
| 719 | // error |
| 720 | wxLogSysError(_("Can not wait for thread termination")); |
| 721 | Kill(); |
| 722 | return wxTHREAD_KILLED; |
| 723 | |
| 724 | case WAIT_OBJECT_0: |
| 725 | // thread we're waiting for terminated |
| 726 | break; |
| 727 | |
| 728 | case WAIT_OBJECT_0 + 1: |
| 729 | // new message arrived, process it -- but only if we're the |
| 730 | // main thread as we don't support processing messages in |
| 731 | // the other ones |
| 732 | // |
| 733 | // NB: we still must include QS_ALLINPUT even when waiting |
| 734 | // in a secondary thread because if it had created some |
| 735 | // window somehow (possible not even using wxWindows) |
| 736 | // the system might dead lock then |
| 737 | if ( wxThread::IsMain() ) |
| 738 | { |
| 739 | // it looks that sometimes WAIT_OBJECT_0 + 1 is |
| 740 | // returned but there are no messages in the thread |
| 741 | // queue -- prevent DoMessageFromThreadWait() from |
| 742 | // blocking inside ::GetMessage() forever in this case |
| 743 | ::PostMessage(NULL, WM_NULL, 0, 0); |
| 744 | |
| 745 | wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() |
| 746 | : NULL; |
| 747 | |
| 748 | if ( traits && !traits->DoMessageFromThreadWait() ) |
| 749 | { |
| 750 | // WM_QUIT received: kill the thread |
| 751 | Kill(); |
| 752 | |
| 753 | return wxTHREAD_KILLED; |
| 754 | } |
| 755 | } |
| 756 | break; |
| 757 | |
| 758 | default: |
| 759 | wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject")); |
| 760 | } |
| 761 | } while ( result != WAIT_OBJECT_0 ); |
| 762 | |
| 763 | if ( wxThread::IsMain() ) |
| 764 | { |
| 765 | gs_waitingForThread = false; |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | // although the thread might be already in the EXITED state it might not |
| 770 | // have terminated yet and so we are not sure that it has actually |
| 771 | // terminated if the "if" above hadn't been taken |
| 772 | do |
| 773 | { |
| 774 | if ( !::GetExitCodeThread(m_hThread, (LPDWORD)&rc) ) |
| 775 | { |
| 776 | wxLogLastError(wxT("GetExitCodeThread")); |
| 777 | |
| 778 | rc = (wxThread::ExitCode)-1; |
| 779 | } |
| 780 | } while ( (DWORD)rc == STILL_ACTIVE ); |
| 781 | |
| 782 | if ( pRc ) |
| 783 | *pRc = rc; |
| 784 | |
| 785 | // we don't need the thread handle any more in any case |
| 786 | Free(); |
| 787 | |
| 788 | |
| 789 | return rc == (wxThread::ExitCode)-1 ? wxTHREAD_MISC_ERROR |
| 790 | : wxTHREAD_NO_ERROR; |
| 791 | } |
| 792 | |
| 793 | bool wxThreadInternal::Suspend() |
| 794 | { |
| 795 | DWORD nSuspendCount = ::SuspendThread(m_hThread); |
| 796 | if ( nSuspendCount == (DWORD)-1 ) |
| 797 | { |
| 798 | wxLogSysError(_("Can not suspend thread %x"), m_hThread); |
| 799 | |
| 800 | return false; |
| 801 | } |
| 802 | |
| 803 | m_state = STATE_PAUSED; |
| 804 | |
| 805 | return true; |
| 806 | } |
| 807 | |
| 808 | bool wxThreadInternal::Resume() |
| 809 | { |
| 810 | DWORD nSuspendCount = ::ResumeThread(m_hThread); |
| 811 | if ( nSuspendCount == (DWORD)-1 ) |
| 812 | { |
| 813 | wxLogSysError(_("Can not resume thread %x"), m_hThread); |
| 814 | |
| 815 | return false; |
| 816 | } |
| 817 | |
| 818 | // don't change the state from STATE_EXITED because it's special and means |
| 819 | // we are going to terminate without running any user code - if we did it, |
| 820 | // the codei n Delete() wouldn't work |
| 821 | if ( m_state != STATE_EXITED ) |
| 822 | { |
| 823 | m_state = STATE_RUNNING; |
| 824 | } |
| 825 | |
| 826 | return true; |
| 827 | } |
| 828 | |
| 829 | // static functions |
| 830 | // ---------------- |
| 831 | |
| 832 | wxThread *wxThread::This() |
| 833 | { |
| 834 | wxThread *thread = (wxThread *)::TlsGetValue(gs_tlsThisThread); |
| 835 | |
| 836 | // be careful, 0 may be a valid return value as well |
| 837 | if ( !thread && (::GetLastError() != NO_ERROR) ) |
| 838 | { |
| 839 | wxLogSysError(_("Couldn't get the current thread pointer")); |
| 840 | |
| 841 | // return NULL... |
| 842 | } |
| 843 | |
| 844 | return thread; |
| 845 | } |
| 846 | |
| 847 | bool wxThread::IsMain() |
| 848 | { |
| 849 | return ::GetCurrentThreadId() == gs_idMainThread; |
| 850 | } |
| 851 | |
| 852 | void wxThread::Yield() |
| 853 | { |
| 854 | // 0 argument to Sleep() is special and means to just give away the rest of |
| 855 | // our timeslice |
| 856 | ::Sleep(0); |
| 857 | } |
| 858 | |
| 859 | void wxThread::Sleep(unsigned long milliseconds) |
| 860 | { |
| 861 | ::Sleep(milliseconds); |
| 862 | } |
| 863 | |
| 864 | int wxThread::GetCPUCount() |
| 865 | { |
| 866 | SYSTEM_INFO si; |
| 867 | GetSystemInfo(&si); |
| 868 | |
| 869 | return si.dwNumberOfProcessors; |
| 870 | } |
| 871 | |
| 872 | unsigned long wxThread::GetCurrentId() |
| 873 | { |
| 874 | return (unsigned long)::GetCurrentThreadId(); |
| 875 | } |
| 876 | |
| 877 | bool wxThread::SetConcurrency(size_t level) |
| 878 | { |
| 879 | #ifndef __WXWINCE__ |
| 880 | wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") ); |
| 881 | |
| 882 | // ok only for the default one |
| 883 | if ( level == 0 ) |
| 884 | return 0; |
| 885 | |
| 886 | // get system affinity mask first |
| 887 | HANDLE hProcess = ::GetCurrentProcess(); |
| 888 | DWORD dwProcMask, dwSysMask; |
| 889 | if ( ::GetProcessAffinityMask(hProcess, &dwProcMask, &dwSysMask) == 0 ) |
| 890 | { |
| 891 | wxLogLastError(_T("GetProcessAffinityMask")); |
| 892 | |
| 893 | return false; |
| 894 | } |
| 895 | |
| 896 | // how many CPUs have we got? |
| 897 | if ( dwSysMask == 1 ) |
| 898 | { |
| 899 | // don't bother with all this complicated stuff - on a single |
| 900 | // processor system it doesn't make much sense anyhow |
| 901 | return level == 1; |
| 902 | } |
| 903 | |
| 904 | // calculate the process mask: it's a bit vector with one bit per |
| 905 | // processor; we want to schedule the process to run on first level |
| 906 | // CPUs |
| 907 | DWORD bit = 1; |
| 908 | while ( bit ) |
| 909 | { |
| 910 | if ( dwSysMask & bit ) |
| 911 | { |
| 912 | // ok, we can set this bit |
| 913 | dwProcMask |= bit; |
| 914 | |
| 915 | // another process added |
| 916 | if ( !--level ) |
| 917 | { |
| 918 | // and that's enough |
| 919 | break; |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | // next bit |
| 924 | bit <<= 1; |
| 925 | } |
| 926 | |
| 927 | // could we set all bits? |
| 928 | if ( level != 0 ) |
| 929 | { |
| 930 | wxLogDebug(_T("bad level %u in wxThread::SetConcurrency()"), level); |
| 931 | |
| 932 | return false; |
| 933 | } |
| 934 | |
| 935 | // set it: we can't link to SetProcessAffinityMask() because it doesn't |
| 936 | // exist in Win9x, use RT binding instead |
| 937 | |
| 938 | typedef BOOL (*SETPROCESSAFFINITYMASK)(HANDLE, DWORD); |
| 939 | |
| 940 | // can use static var because we're always in the main thread here |
| 941 | static SETPROCESSAFFINITYMASK pfnSetProcessAffinityMask = NULL; |
| 942 | |
| 943 | if ( !pfnSetProcessAffinityMask ) |
| 944 | { |
| 945 | HMODULE hModKernel = ::LoadLibrary(_T("kernel32")); |
| 946 | if ( hModKernel ) |
| 947 | { |
| 948 | pfnSetProcessAffinityMask = (SETPROCESSAFFINITYMASK) |
| 949 | ::GetProcAddress(hModKernel, "SetProcessAffinityMask"); |
| 950 | } |
| 951 | |
| 952 | // we've discovered a MT version of Win9x! |
| 953 | wxASSERT_MSG( pfnSetProcessAffinityMask, |
| 954 | _T("this system has several CPUs but no SetProcessAffinityMask function?") ); |
| 955 | } |
| 956 | |
| 957 | if ( !pfnSetProcessAffinityMask ) |
| 958 | { |
| 959 | // msg given above - do it only once |
| 960 | return false; |
| 961 | } |
| 962 | |
| 963 | if ( pfnSetProcessAffinityMask(hProcess, dwProcMask) == 0 ) |
| 964 | { |
| 965 | wxLogLastError(_T("SetProcessAffinityMask")); |
| 966 | |
| 967 | return false; |
| 968 | } |
| 969 | #endif |
| 970 | return true; |
| 971 | } |
| 972 | |
| 973 | // ctor and dtor |
| 974 | // ------------- |
| 975 | |
| 976 | wxThread::wxThread(wxThreadKind kind) |
| 977 | { |
| 978 | m_internal = new wxThreadInternal(this); |
| 979 | |
| 980 | m_isDetached = kind == wxTHREAD_DETACHED; |
| 981 | } |
| 982 | |
| 983 | wxThread::~wxThread() |
| 984 | { |
| 985 | delete m_internal; |
| 986 | } |
| 987 | |
| 988 | // create/start thread |
| 989 | // ------------------- |
| 990 | |
| 991 | wxThreadError wxThread::Create(unsigned int stackSize) |
| 992 | { |
| 993 | wxCriticalSectionLocker lock(m_critsect); |
| 994 | |
| 995 | if ( !m_internal->Create(this, stackSize) ) |
| 996 | return wxTHREAD_NO_RESOURCE; |
| 997 | |
| 998 | return wxTHREAD_NO_ERROR; |
| 999 | } |
| 1000 | |
| 1001 | wxThreadError wxThread::Run() |
| 1002 | { |
| 1003 | wxCriticalSectionLocker lock(m_critsect); |
| 1004 | |
| 1005 | if ( m_internal->GetState() != STATE_NEW ) |
| 1006 | { |
| 1007 | // actually, it may be almost any state at all, not only STATE_RUNNING |
| 1008 | return wxTHREAD_RUNNING; |
| 1009 | } |
| 1010 | |
| 1011 | // the thread has just been created and is still suspended - let it run |
| 1012 | return Resume(); |
| 1013 | } |
| 1014 | |
| 1015 | // suspend/resume thread |
| 1016 | // --------------------- |
| 1017 | |
| 1018 | wxThreadError wxThread::Pause() |
| 1019 | { |
| 1020 | wxCriticalSectionLocker lock(m_critsect); |
| 1021 | |
| 1022 | return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; |
| 1023 | } |
| 1024 | |
| 1025 | wxThreadError wxThread::Resume() |
| 1026 | { |
| 1027 | wxCriticalSectionLocker lock(m_critsect); |
| 1028 | |
| 1029 | return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; |
| 1030 | } |
| 1031 | |
| 1032 | // stopping thread |
| 1033 | // --------------- |
| 1034 | |
| 1035 | wxThread::ExitCode wxThread::Wait() |
| 1036 | { |
| 1037 | // although under Windows we can wait for any thread, it's an error to |
| 1038 | // wait for a detached one in wxWin API |
| 1039 | wxCHECK_MSG( !IsDetached(), (ExitCode)-1, |
| 1040 | _T("wxThread::Wait(): can't wait for detached thread") ); |
| 1041 | |
| 1042 | ExitCode rc = (ExitCode)-1; |
| 1043 | |
| 1044 | (void)m_internal->WaitForTerminate(m_critsect, &rc); |
| 1045 | |
| 1046 | return rc; |
| 1047 | } |
| 1048 | |
| 1049 | wxThreadError wxThread::Delete(ExitCode *pRc) |
| 1050 | { |
| 1051 | return m_internal->WaitForTerminate(m_critsect, pRc, this); |
| 1052 | } |
| 1053 | |
| 1054 | wxThreadError wxThread::Kill() |
| 1055 | { |
| 1056 | if ( !IsRunning() ) |
| 1057 | return wxTHREAD_NOT_RUNNING; |
| 1058 | |
| 1059 | wxThreadError rc = m_internal->Kill(); |
| 1060 | |
| 1061 | if ( IsDetached() ) |
| 1062 | { |
| 1063 | delete this; |
| 1064 | } |
| 1065 | else // joinable |
| 1066 | { |
| 1067 | // update the status of the joinable thread |
| 1068 | wxCriticalSectionLocker lock(m_critsect); |
| 1069 | m_internal->SetState(STATE_EXITED); |
| 1070 | } |
| 1071 | |
| 1072 | return rc; |
| 1073 | } |
| 1074 | |
| 1075 | void wxThread::Exit(ExitCode status) |
| 1076 | { |
| 1077 | m_internal->Free(); |
| 1078 | |
| 1079 | if ( IsDetached() ) |
| 1080 | { |
| 1081 | delete this; |
| 1082 | } |
| 1083 | else // joinable |
| 1084 | { |
| 1085 | // update the status of the joinable thread |
| 1086 | wxCriticalSectionLocker lock(m_critsect); |
| 1087 | m_internal->SetState(STATE_EXITED); |
| 1088 | } |
| 1089 | |
| 1090 | #ifdef wxUSE_BEGIN_THREAD |
| 1091 | _endthreadex((unsigned)status); |
| 1092 | #else // !VC++ |
| 1093 | ::ExitThread((DWORD)status); |
| 1094 | #endif // VC++/!VC++ |
| 1095 | |
| 1096 | wxFAIL_MSG(wxT("Couldn't return from ExitThread()!")); |
| 1097 | } |
| 1098 | |
| 1099 | // priority setting |
| 1100 | // ---------------- |
| 1101 | |
| 1102 | void wxThread::SetPriority(unsigned int prio) |
| 1103 | { |
| 1104 | wxCriticalSectionLocker lock(m_critsect); |
| 1105 | |
| 1106 | m_internal->SetPriority(prio); |
| 1107 | } |
| 1108 | |
| 1109 | unsigned int wxThread::GetPriority() const |
| 1110 | { |
| 1111 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast |
| 1112 | |
| 1113 | return m_internal->GetPriority(); |
| 1114 | } |
| 1115 | |
| 1116 | unsigned long wxThread::GetId() const |
| 1117 | { |
| 1118 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast |
| 1119 | |
| 1120 | return (unsigned long)m_internal->GetId(); |
| 1121 | } |
| 1122 | |
| 1123 | bool wxThread::IsRunning() const |
| 1124 | { |
| 1125 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast |
| 1126 | |
| 1127 | return m_internal->GetState() == STATE_RUNNING; |
| 1128 | } |
| 1129 | |
| 1130 | bool wxThread::IsAlive() const |
| 1131 | { |
| 1132 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast |
| 1133 | |
| 1134 | return (m_internal->GetState() == STATE_RUNNING) || |
| 1135 | (m_internal->GetState() == STATE_PAUSED); |
| 1136 | } |
| 1137 | |
| 1138 | bool wxThread::IsPaused() const |
| 1139 | { |
| 1140 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast |
| 1141 | |
| 1142 | return m_internal->GetState() == STATE_PAUSED; |
| 1143 | } |
| 1144 | |
| 1145 | bool wxThread::TestDestroy() |
| 1146 | { |
| 1147 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast |
| 1148 | |
| 1149 | return m_internal->GetState() == STATE_CANCELED; |
| 1150 | } |
| 1151 | |
| 1152 | // ---------------------------------------------------------------------------- |
| 1153 | // Automatic initialization for thread module |
| 1154 | // ---------------------------------------------------------------------------- |
| 1155 | |
| 1156 | class wxThreadModule : public wxModule |
| 1157 | { |
| 1158 | public: |
| 1159 | virtual bool OnInit(); |
| 1160 | virtual void OnExit(); |
| 1161 | |
| 1162 | private: |
| 1163 | DECLARE_DYNAMIC_CLASS(wxThreadModule) |
| 1164 | }; |
| 1165 | |
| 1166 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) |
| 1167 | |
| 1168 | bool wxThreadModule::OnInit() |
| 1169 | { |
| 1170 | // allocate TLS index for storing the pointer to the current thread |
| 1171 | gs_tlsThisThread = ::TlsAlloc(); |
| 1172 | if ( gs_tlsThisThread == 0xFFFFFFFF ) |
| 1173 | { |
| 1174 | // in normal circumstances it will only happen if all other |
| 1175 | // TLS_MINIMUM_AVAILABLE (>= 64) indices are already taken - in other |
| 1176 | // words, this should never happen |
| 1177 | wxLogSysError(_("Thread module initialization failed: impossible to allocate index in thread local storage")); |
| 1178 | |
| 1179 | return false; |
| 1180 | } |
| 1181 | |
| 1182 | // main thread doesn't have associated wxThread object, so store 0 in the |
| 1183 | // TLS instead |
| 1184 | if ( !::TlsSetValue(gs_tlsThisThread, (LPVOID)0) ) |
| 1185 | { |
| 1186 | ::TlsFree(gs_tlsThisThread); |
| 1187 | gs_tlsThisThread = 0xFFFFFFFF; |
| 1188 | |
| 1189 | wxLogSysError(_("Thread module initialization failed: can not store value in thread local storage")); |
| 1190 | |
| 1191 | return false; |
| 1192 | } |
| 1193 | |
| 1194 | gs_critsectWaitingForGui = new wxCriticalSection(); |
| 1195 | |
| 1196 | gs_critsectGui = new wxCriticalSection(); |
| 1197 | gs_critsectGui->Enter(); |
| 1198 | |
| 1199 | gs_critsectThreadDelete = new wxCriticalSection; |
| 1200 | |
| 1201 | // no error return for GetCurrentThreadId() |
| 1202 | gs_idMainThread = ::GetCurrentThreadId(); |
| 1203 | |
| 1204 | return true; |
| 1205 | } |
| 1206 | |
| 1207 | void wxThreadModule::OnExit() |
| 1208 | { |
| 1209 | if ( !::TlsFree(gs_tlsThisThread) ) |
| 1210 | { |
| 1211 | wxLogLastError(wxT("TlsFree failed.")); |
| 1212 | } |
| 1213 | |
| 1214 | delete gs_critsectThreadDelete; |
| 1215 | gs_critsectThreadDelete = NULL; |
| 1216 | |
| 1217 | if ( gs_critsectGui ) |
| 1218 | { |
| 1219 | gs_critsectGui->Leave(); |
| 1220 | delete gs_critsectGui; |
| 1221 | gs_critsectGui = NULL; |
| 1222 | } |
| 1223 | |
| 1224 | delete gs_critsectWaitingForGui; |
| 1225 | gs_critsectWaitingForGui = NULL; |
| 1226 | } |
| 1227 | |
| 1228 | // ---------------------------------------------------------------------------- |
| 1229 | // under Windows, these functions are implemented using a critical section and |
| 1230 | // not a mutex, so the names are a bit confusing |
| 1231 | // ---------------------------------------------------------------------------- |
| 1232 | |
| 1233 | void WXDLLIMPEXP_BASE wxMutexGuiEnter() |
| 1234 | { |
| 1235 | // this would dead lock everything... |
| 1236 | wxASSERT_MSG( !wxThread::IsMain(), |
| 1237 | wxT("main thread doesn't want to block in wxMutexGuiEnter()!") ); |
| 1238 | |
| 1239 | // the order in which we enter the critical sections here is crucial!! |
| 1240 | |
| 1241 | // set the flag telling to the main thread that we want to do some GUI |
| 1242 | { |
| 1243 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); |
| 1244 | |
| 1245 | gs_nWaitingForGui++; |
| 1246 | } |
| 1247 | |
| 1248 | wxWakeUpMainThread(); |
| 1249 | |
| 1250 | // now we may block here because the main thread will soon let us in |
| 1251 | // (during the next iteration of OnIdle()) |
| 1252 | gs_critsectGui->Enter(); |
| 1253 | } |
| 1254 | |
| 1255 | void WXDLLIMPEXP_BASE wxMutexGuiLeave() |
| 1256 | { |
| 1257 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); |
| 1258 | |
| 1259 | if ( wxThread::IsMain() ) |
| 1260 | { |
| 1261 | gs_bGuiOwnedByMainThread = false; |
| 1262 | } |
| 1263 | else |
| 1264 | { |
| 1265 | // decrement the number of threads waiting for GUI access now |
| 1266 | wxASSERT_MSG( gs_nWaitingForGui > 0, |
| 1267 | wxT("calling wxMutexGuiLeave() without entering it first?") ); |
| 1268 | |
| 1269 | gs_nWaitingForGui--; |
| 1270 | |
| 1271 | wxWakeUpMainThread(); |
| 1272 | } |
| 1273 | |
| 1274 | gs_critsectGui->Leave(); |
| 1275 | } |
| 1276 | |
| 1277 | void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter() |
| 1278 | { |
| 1279 | wxASSERT_MSG( wxThread::IsMain(), |
| 1280 | wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") ); |
| 1281 | |
| 1282 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); |
| 1283 | |
| 1284 | if ( gs_nWaitingForGui == 0 ) |
| 1285 | { |
| 1286 | // no threads are waiting for GUI - so we may acquire the lock without |
| 1287 | // any danger (but only if we don't already have it) |
| 1288 | if ( !wxGuiOwnedByMainThread() ) |
| 1289 | { |
| 1290 | gs_critsectGui->Enter(); |
| 1291 | |
| 1292 | gs_bGuiOwnedByMainThread = true; |
| 1293 | } |
| 1294 | //else: already have it, nothing to do |
| 1295 | } |
| 1296 | else |
| 1297 | { |
| 1298 | // some threads are waiting, release the GUI lock if we have it |
| 1299 | if ( wxGuiOwnedByMainThread() ) |
| 1300 | { |
| 1301 | wxMutexGuiLeave(); |
| 1302 | } |
| 1303 | //else: some other worker thread is doing GUI |
| 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread() |
| 1308 | { |
| 1309 | return gs_bGuiOwnedByMainThread; |
| 1310 | } |
| 1311 | |
| 1312 | // wake up the main thread if it's in ::GetMessage() |
| 1313 | void WXDLLIMPEXP_BASE wxWakeUpMainThread() |
| 1314 | { |
| 1315 | // sending any message would do - hopefully WM_NULL is harmless enough |
| 1316 | if ( !::PostThreadMessage(gs_idMainThread, WM_NULL, 0, 0) ) |
| 1317 | { |
| 1318 | // should never happen |
| 1319 | wxLogLastError(wxT("PostThreadMessage(WM_NULL)")); |
| 1320 | } |
| 1321 | } |
| 1322 | |
| 1323 | bool WXDLLIMPEXP_BASE wxIsWaitingForThread() |
| 1324 | { |
| 1325 | return gs_waitingForThread; |
| 1326 | } |
| 1327 | |
| 1328 | // ---------------------------------------------------------------------------- |
| 1329 | // include common implementation code |
| 1330 | // ---------------------------------------------------------------------------- |
| 1331 | |
| 1332 | #include "wx/thrimpl.cpp" |
| 1333 | |
| 1334 | #endif // wxUSE_THREADS |
| 1335 | |