/////////////////////////////////////////////////////////////////////////////
-// Name: thread.cpp
+// Name: src/msw/thread.cpp
// Purpose: wxThread Implementation
// Author: Original from Wolfram Gloger/Guilhem Lavaux
// Modified by: Vadim Zeitlin to make it work :-)
// Created: 04/22/98
// RCS-ID: $Id$
-// Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
-// Vadim Zeitlin (1999)
+// Copyright: (c) Wolfram Gloger (1996, 1997), Guilhem Lavaux (1998);
+// Vadim Zeitlin (1999-2002)
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#endif
#ifndef WX_PRECOMP
-# include "wx/wx.h"
+ #include "wx/intl.h"
+ #include "wx/app.h"
#endif
#if wxUSE_THREADS
+#include "wx/apptrait.h"
+
#include "wx/msw/private.h"
+#include "wx/msw/missing.h"
#include "wx/module.h"
#include "wx/thread.h"
-#ifdef Yield
-# undef Yield
-#endif
-
// must have this symbol defined to get _beginthread/_endthread declarations
#ifndef _MT
#define _MT
(defined(__GNUG__) && defined(__MSVCRT__)) || \
defined(__WATCOMC__) || defined(__MWERKS__)
+#ifndef __WXWINCE__
#undef wxUSE_BEGIN_THREAD
#define wxUSE_BEGIN_THREAD
#endif
+#endif
+
#ifdef wxUSE_BEGIN_THREAD
// this is where _beginthreadex() is declared
#include <process.h>
static bool gs_waitingForThread = FALSE;
// ============================================================================
-// Windows implementation of thread classes
+// Windows implementation of thread and related classes
// ============================================================================
// ----------------------------------------------------------------------------
-// wxMutex implementation
+// wxCriticalSection
+// ----------------------------------------------------------------------------
+
+wxCriticalSection::wxCriticalSection()
+{
+ wxCOMPILE_TIME_ASSERT( sizeof(CRITICAL_SECTION) <= sizeof(wxCritSectBuffer),
+ wxCriticalSectionBufferTooSmall );
+
+ ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
+}
+
+wxCriticalSection::~wxCriticalSection()
+{
+ ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer);
+}
+
+void wxCriticalSection::Enter()
+{
+ ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer);
+}
+
+void wxCriticalSection::Leave()
+{
+ ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer);
+}
+
+// ----------------------------------------------------------------------------
+// wxMutex
// ----------------------------------------------------------------------------
class wxMutexInternal
{
public:
- wxMutexInternal()
- {
- m_mutex = ::CreateMutex(NULL, FALSE, NULL);
- if ( !m_mutex )
- {
- wxLogSysError(_("Can not create mutex"));
- }
- }
+ wxMutexInternal(wxMutexType mutexType);
+ ~wxMutexInternal();
- ~wxMutexInternal() { if ( m_mutex ) ::CloseHandle(m_mutex); }
+ bool IsOk() const { return m_mutex != NULL; }
+
+ wxMutexError Lock() { return LockTimeout(INFINITE); }
+ wxMutexError TryLock() { return LockTimeout(0); }
+ wxMutexError Unlock();
+
+private:
+ wxMutexError LockTimeout(DWORD milliseconds);
-public:
HANDLE m_mutex;
+
+ DECLARE_NO_COPY_CLASS(wxMutexInternal)
};
-wxMutex::wxMutex()
+// all mutexes are recursive under Win32 so we don't use mutexType
+wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(mutexType))
{
- m_internal = new wxMutexInternal;
+ // create a nameless (hence intra process and always private) mutex
+ m_mutex = ::CreateMutex
+ (
+ NULL, // default secutiry attributes
+ FALSE, // not initially locked
+ NULL // no name
+ );
- m_locked = 0;
+ if ( !m_mutex )
+ {
+ wxLogLastError(_T("CreateMutex()"));
+ }
}
-wxMutex::~wxMutex()
+wxMutexInternal::~wxMutexInternal()
{
- if ( m_locked > 0 )
+ if ( m_mutex )
{
- wxLogDebug(_T("Warning: freeing a locked mutex (%d locks)."), m_locked);
+ if ( !::CloseHandle(m_mutex) )
+ {
+ wxLogLastError(_T("CloseHandle(mutex)"));
+ }
}
-
- delete m_internal;
}
-wxMutexError wxMutex::Lock()
+wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds)
{
- DWORD ret;
-
- ret = WaitForSingleObject(m_internal->m_mutex, INFINITE);
- switch ( ret )
+ DWORD rc = ::WaitForSingleObject(m_mutex, milliseconds);
+ if ( rc == WAIT_ABANDONED )
{
- case WAIT_ABANDONED:
- return wxMUTEX_BUSY;
+ // the previous caller died without releasing the mutex, but now we can
+ // really lock it
+ wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED"));
+ // use 0 timeout, normally we should always get it
+ rc = ::WaitForSingleObject(m_mutex, 0);
+ }
+
+ switch ( rc )
+ {
case WAIT_OBJECT_0:
// ok
break;
- case WAIT_FAILED:
- wxLogSysError(_("Couldn't acquire a mutex lock"));
- return wxMUTEX_MISC_ERROR;
-
case WAIT_TIMEOUT:
+ return wxMUTEX_BUSY;
+
+ case WAIT_ABANDONED: // checked for above
default:
wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
- }
-
- m_locked++;
- return wxMUTEX_NO_ERROR;
-}
-
-wxMutexError wxMutex::TryLock()
-{
- DWORD ret;
+ // fall through
- ret = WaitForSingleObject(m_internal->m_mutex, 0);
- if (ret == WAIT_TIMEOUT || ret == WAIT_ABANDONED)
- return wxMUTEX_BUSY;
+ case WAIT_FAILED:
+ wxLogLastError(_T("WaitForSingleObject(mutex)"));
+ return wxMUTEX_MISC_ERROR;
+ }
- m_locked++;
return wxMUTEX_NO_ERROR;
}
-wxMutexError wxMutex::Unlock()
+wxMutexError wxMutexInternal::Unlock()
{
- if (m_locked > 0)
- m_locked--;
-
- BOOL ret = ReleaseMutex(m_internal->m_mutex);
- if ( ret == 0 )
+ if ( !::ReleaseMutex(m_mutex) )
{
- wxLogSysError(_("Couldn't release a mutex"));
+ wxLogLastError(_T("ReleaseMutex()"));
+
return wxMUTEX_MISC_ERROR;
}
return wxMUTEX_NO_ERROR;
}
-// ==========================================================================
-// wxSemaphore
-// ==========================================================================
-
// --------------------------------------------------------------------------
-// wxSemaphoreInternal
+// wxSemaphore
// --------------------------------------------------------------------------
+// a trivial wrapper around Win32 semaphore
class wxSemaphoreInternal
{
public:
- wxSemaphoreInternal( int initialcount = 0, int maxcount = 0 );
+ wxSemaphoreInternal(int initialcount, int maxcount);
~wxSemaphoreInternal();
- void Wait();
- bool TryWait();
+ bool IsOk() const { return m_semaphore != NULL; }
+
+ wxSemaError Wait() { return WaitTimeout(INFINITE); }
+
+ wxSemaError TryWait()
+ {
+ wxSemaError rc = WaitTimeout(0);
+ if ( rc == wxSEMA_TIMEOUT )
+ rc = wxSEMA_BUSY;
+
+ return rc;
+ }
- bool Wait( unsigned long timeout_millis );
+ wxSemaError WaitTimeout(unsigned long milliseconds);
- void Post();
+ wxSemaError Post();
private:
HANDLE m_semaphore;
+
+ DECLARE_NO_COPY_CLASS(wxSemaphoreInternal)
};
-wxSemaphoreInternal::wxSemaphoreInternal( int initialcount, int maxcount )
+wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
{
+#ifndef __WXWINCE__
if ( maxcount == 0 )
{
// make it practically infinite
maxcount = INT_MAX;
}
- m_semaphore = ::CreateSemaphore( NULL, initialcount, maxcount, NULL );
+ m_semaphore = ::CreateSemaphore
+ (
+ NULL, // default security attributes
+ initialcount,
+ maxcount,
+ NULL // no name
+ );
+#endif
if ( !m_semaphore )
{
wxLogLastError(_T("CreateSemaphore()"));
wxSemaphoreInternal::~wxSemaphoreInternal()
{
- CloseHandle( m_semaphore );
-}
-
-void wxSemaphoreInternal::Wait()
-{
- if ( ::WaitForSingleObject( m_semaphore, INFINITE ) != WAIT_OBJECT_0 )
+ if ( m_semaphore )
{
- wxLogLastError(_T("WaitForSingleObject"));
+ if ( !::CloseHandle(m_semaphore) )
+ {
+ wxLogLastError(_T("CloseHandle(semaphore)"));
+ }
}
}
-bool wxSemaphoreInternal::TryWait()
-{
- return Wait(0);
-}
-
-bool wxSemaphoreInternal::Wait( unsigned long timeout_millis )
+wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
{
- DWORD result = ::WaitForSingleObject( m_semaphore, timeout_millis );
+ DWORD rc = ::WaitForSingleObject( m_semaphore, milliseconds );
- switch ( result )
+ switch ( rc )
{
case WAIT_OBJECT_0:
- return TRUE;
+ return wxSEMA_NO_ERROR;
case WAIT_TIMEOUT:
- break;
+ return wxSEMA_TIMEOUT;
default:
- wxLogLastError(_T("WaitForSingleObject()"));
+ wxLogLastError(_T("WaitForSingleObject(semaphore)"));
}
- return FALSE;
+ return wxSEMA_MISC_ERROR;
}
-void wxSemaphoreInternal::Post()
+wxSemaError wxSemaphoreInternal::Post()
{
- if ( !::ReleaseSemaphore( m_semaphore, 1, NULL ) )
+#ifndef __WXWINCE__
+ if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) )
+#endif
{
wxLogLastError(_T("ReleaseSemaphore"));
- }
-}
-
-// --------------------------------------------------------------------------
-// wxSemaphore
-// --------------------------------------------------------------------------
-
-wxSemaphore::wxSemaphore( int initialcount, int maxcount )
-{
- m_internal = new wxSemaphoreInternal( initialcount, maxcount );
-}
-wxSemaphore::~wxSemaphore()
-{
- delete m_internal;
-}
-
-void wxSemaphore::Wait()
-{
- m_internal->Wait();
-}
-
-bool wxSemaphore::TryWait()
-{
- return m_internal->TryWait();
-}
-
-bool wxSemaphore::Wait( unsigned long timeout_millis )
-{
- return m_internal->Wait( timeout_millis );
-}
+ return wxSEMA_MISC_ERROR;
+ }
-void wxSemaphore::Post()
-{
- m_internal->Post();
+ return wxSEMA_NO_ERROR;
}
-
-// ==========================================================================
-// wxCondition
-// ==========================================================================
-
// --------------------------------------------------------------------------
-// wxConditionInternal
+// wxCondition
// --------------------------------------------------------------------------
+// Win32 doesn't have explicit support for the POSIX condition variables and
+// the Win32 events have quite different semantics, so we reimplement the
+// conditions from scratch using the mutexes and semaphores
class wxConditionInternal
{
public:
wxConditionInternal(wxMutex& mutex);
- void Wait();
-
- bool Wait( unsigned long timeout_millis );
+ bool IsOk() const { return m_mutex.IsOk() && m_semaphore.IsOk(); }
- void Signal();
+ wxCondError Wait();
+ wxCondError WaitTimeout(unsigned long milliseconds);
- void Broadcast();
+ wxCondError Signal();
+ wxCondError Broadcast();
private:
- int m_numWaiters;
- wxMutex m_mutexNumWaiters;
+ // the number of threads currently waiting for this condition
+ LONG m_numWaiters;
- wxMutex& m_mutex;
+ // the critical section protecting m_numWaiters
+ wxCriticalSection m_csWaiters;
+ wxMutex& m_mutex;
wxSemaphore m_semaphore;
DECLARE_NO_COPY_CLASS(wxConditionInternal)
wxConditionInternal::wxConditionInternal(wxMutex& mutex)
: m_mutex(mutex)
{
-
+ // another thread can't access it until we return from ctor, so no need to
+ // protect access to m_numWaiters here
m_numWaiters = 0;
}
-void wxConditionInternal::Wait()
+wxCondError wxConditionInternal::Wait()
{
// increment the number of waiters
- m_mutexNumWaiters.Lock();
- m_numWaiters++;
- m_mutexNumWaiters.Unlock();
+ ::InterlockedIncrement(&m_numWaiters);
m_mutex.Unlock();
// can 'remember' signals the race condition will not occur
// wait ( if necessary ) and decrement semaphore
- m_semaphore.Wait();
-
+ wxSemaError err = m_semaphore.Wait();
m_mutex.Lock();
+
+ return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR;
}
-bool wxConditionInternal::Wait( unsigned long timeout_millis )
+wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds)
{
- m_mutexNumWaiters.Lock();
- m_numWaiters++;
- m_mutexNumWaiters.Unlock();
+ ::InterlockedIncrement(&m_numWaiters);
m_mutex.Unlock();
//
// please see the comments in Wait(), for details
- bool success = TRUE;
-
- bool result = m_semaphore.Wait( timeout_millis );
+ wxSemaError err = m_semaphore.WaitTimeout(milliseconds);
- if ( !result )
+ if ( err == wxSEMA_BUSY )
{
// another potential race condition exists here it is caused when a
// 'waiting' thread timesout, and returns from WaitForSingleObject, but
// 'nwaiters_mutex'. this call does not block because of the zero
// timeout, but will allow the waiting thread to catch the missed
// signals.
- m_mutexNumWaiters.Lock();
- result = m_semaphore.Wait( 0 );
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ err = m_semaphore.WaitTimeout(0);
- if ( !result )
+ if ( err != wxSEMA_NO_ERROR )
{
m_numWaiters--;
- success = FALSE;
}
-
- m_mutexNumWaiters.Unlock();
}
m_mutex.Lock();
- return success;
+ return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR;
}
-void wxConditionInternal::Signal()
+wxCondError wxConditionInternal::Signal()
{
- m_mutexNumWaiters.Lock();
+ wxCriticalSectionLocker lock(m_csWaiters);
if ( m_numWaiters > 0 )
{
// increment the semaphore by 1
- m_semaphore.Post();
+ if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+ return wxCOND_MISC_ERROR;
m_numWaiters--;
}
- m_mutexNumWaiters.Unlock();
+ return wxCOND_NO_ERROR;
}
-void wxConditionInternal::Broadcast()
+wxCondError wxConditionInternal::Broadcast()
{
- m_mutexNumWaiters.Lock();
+ wxCriticalSectionLocker lock(m_csWaiters);
while ( m_numWaiters > 0 )
{
- m_semaphore.Post();
+ if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+ return wxCOND_MISC_ERROR;
+
m_numWaiters--;
}
- m_mutexNumWaiters.Unlock();
-}
-
-// ----------------------------------------------------------------------------
-// wxCondition implementation
-// ----------------------------------------------------------------------------
-
-wxCondition::wxCondition(wxMutex& mutex)
-{
- m_internal = new wxConditionInternal( mutex );
-}
-
-wxCondition::~wxCondition()
-{
- delete m_internal;
-}
-
-void wxCondition::Wait()
-{
- m_internal->Wait();
-}
-
-bool wxCondition::Wait( unsigned long timeout_millis )
-{
- return m_internal->Wait(timeout_millis);
-}
-
-void wxCondition::Signal()
-{
- m_internal->Signal();
-}
-
-void wxCondition::Broadcast()
-{
- m_internal->Broadcast();
-}
-
-// ----------------------------------------------------------------------------
-// wxCriticalSection implementation
-// ----------------------------------------------------------------------------
-
-wxCriticalSection::wxCriticalSection()
-{
-#ifdef __WXDEBUG__
- // Done this way to stop warnings during compilation about statement
- // always being FALSE
- int csSize = sizeof(CRITICAL_SECTION);
- int bSize = sizeof(m_buffer);
- wxASSERT_MSG( csSize <= bSize,
- _T("must increase buffer size in wx/thread.h") );
-#endif
-
- ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
-}
-
-wxCriticalSection::~wxCriticalSection()
-{
- ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer);
-}
-
-void wxCriticalSection::Enter()
-{
- ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer);
-}
-
-void wxCriticalSection::Leave()
-{
- ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer);
+ return wxCOND_NO_ERROR;
}
// ----------------------------------------------------------------------------
// create a new (suspended) thread (for the given thread object)
bool Create(wxThread *thread, unsigned int stackSize);
+ // wait for the thread to terminate, either by itself, or by asking it
+ // (politely, this is not Kill()!) to do it
+ wxThreadError WaitForTerminate(bool shouldCancel,
+ wxCriticalSection& cs,
+ wxThread::ExitCode *pRc);
+
+ // kill the thread unconditionally
+ wxThreadError Kill();
+
// suspend/resume/terminate
bool Suspend();
bool Resume();
wxThreadState m_state; // state, see wxThreadState enum
unsigned int m_priority; // thread priority in "wx" units
DWORD m_tid; // thread id
+
+ DECLARE_NO_COPY_CLASS(wxThreadInternal)
};
THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize)
{
+ wxASSERT_MSG( m_state == STATE_NEW && !m_hThread,
+ _T("Create()ing thread twice?") );
+
// for compilers which have it, we should use C RTL function for thread
// creation instead of Win32 API one because otherwise we will have memory
// leaks if the thread uses C RTL (and most threads do)
return TRUE;
}
+wxThreadError wxThreadInternal::Kill()
+{
+ if ( !::TerminateThread(m_hThread, (DWORD)-1) )
+ {
+ wxLogSysError(_("Couldn't terminate thread"));
+
+ return wxTHREAD_MISC_ERROR;
+ }
+
+ Free();
+
+ return wxTHREAD_NO_ERROR;
+}
+
+wxThreadError
+wxThreadInternal::WaitForTerminate(bool shouldCancel,
+ wxCriticalSection& cs,
+ wxThread::ExitCode *pRc)
+{
+ wxThread::ExitCode rc = 0;
+
+ // Delete() is always safe to call, so consider all possible states
+
+ // we might need to resume the thread, but we might also not need to cancel
+ // it if it doesn't run yet
+ bool shouldResume = FALSE,
+ isRunning = FALSE;
+
+ // check if the thread already started to run
+ {
+ wxCriticalSectionLocker lock(cs);
+
+ if ( m_state == STATE_NEW )
+ {
+ if ( shouldCancel )
+ {
+ // WinThreadStart() will see it and terminate immediately, no need
+ // to cancel the thread - but we still need to resume it to let it
+ // run
+ m_state = STATE_EXITED;
+
+ Resume(); // it knows about STATE_EXITED special case
+
+ shouldCancel = FALSE;
+ }
+
+ isRunning = TRUE;
+
+ // shouldResume is correctly set to FALSE here
+ }
+ else
+ {
+ shouldResume = m_state == STATE_PAUSED;
+ }
+ }
+
+ // resume the thread if it is paused
+ if ( shouldResume )
+ Resume();
+
+ // does is still run?
+ if ( isRunning || m_state == STATE_RUNNING )
+ {
+ if ( wxThread::IsMain() )
+ {
+ // set flag for wxIsWaitingForThread()
+ gs_waitingForThread = TRUE;
+ }
+
+ // ask the thread to terminate
+ if ( shouldCancel )
+ {
+ wxCriticalSectionLocker lock(cs);
+
+ Cancel();
+ }
+
+ // we can't just wait for the thread to terminate because it might be
+ // calling some GUI functions and so it will never terminate before we
+ // process the Windows messages that result from these functions
+ // (note that even in console applications we might have to process
+ // messages if we use wxExecute() or timers or ...)
+ DWORD result = 0; // suppress warnings from broken compilers
+ do
+ {
+ if ( wxThread::IsMain() )
+ {
+ // give the thread we're waiting for chance to do the GUI call
+ // it might be in
+ if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
+ {
+ wxMutexGuiLeave();
+ }
+ }
+
+ result = ::MsgWaitForMultipleObjects
+ (
+ 1, // number of objects to wait for
+ &m_hThread, // the objects
+ FALSE, // don't wait for all objects
+ INFINITE, // no timeout
+ QS_ALLINPUT | // return as soon as there are any events
+ QS_ALLPOSTMESSAGE
+ );
+
+ switch ( result )
+ {
+ case 0xFFFFFFFF:
+ // error
+ wxLogSysError(_("Can not wait for thread termination"));
+ Kill();
+ return wxTHREAD_KILLED;
+
+ case WAIT_OBJECT_0:
+ // thread we're waiting for terminated
+ break;
+
+ case WAIT_OBJECT_0 + 1:
+ // new message arrived, process it -- but only if we're the
+ // main thread as we don't support processing messages in
+ // the other ones
+ //
+ // NB: we still must include QS_ALLINPUT even when waiting
+ // in a secondary thread because if it had created some
+ // window somehow (possible not even using wxWindows)
+ // the system might dead lock then
+ if ( wxThread::IsMain() )
+ {
+ // it looks that sometimes WAIT_OBJECT_0 + 1 is
+ // returned but there are no messages in the thread
+ // queue -- prevent DoMessageFromThreadWait() from
+ // blocking inside ::GetMessage() forever in this case
+ ::PostMessage(NULL, WM_NULL, 0, 0);
+
+ wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits()
+ : NULL;
+
+ if ( traits && !traits->DoMessageFromThreadWait() )
+ {
+ // WM_QUIT received: kill the thread
+ Kill();
+
+ return wxTHREAD_KILLED;
+ }
+ }
+ break;
+
+ default:
+ wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
+ }
+ } while ( result != WAIT_OBJECT_0 );
+
+ if ( wxThread::IsMain() )
+ {
+ gs_waitingForThread = FALSE;
+ }
+ }
+
+ // although the thread might be already in the EXITED state it might not
+ // have terminated yet and so we are not sure that it has actually
+ // terminated if the "if" above hadn't been taken
+ do
+ {
+ if ( !::GetExitCodeThread(m_hThread, (LPDWORD)&rc) )
+ {
+ wxLogLastError(wxT("GetExitCodeThread"));
+
+ rc = (wxThread::ExitCode)-1;
+ }
+ } while ( (DWORD)rc == STILL_ACTIVE );
+
+ if ( pRc )
+ *pRc = rc;
+
+ return rc == (wxThread::ExitCode)-1 ? wxTHREAD_MISC_ERROR
+ : wxTHREAD_NO_ERROR;
+}
+
bool wxThreadInternal::Suspend()
{
DWORD nSuspendCount = ::SuspendThread(m_hThread);
bool wxThread::SetConcurrency(size_t level)
{
+#ifndef __WXWINCE__
wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
// ok only for the default one
return FALSE;
}
-
+#endif
return TRUE;
}
// although under Windows we can wait for any thread, it's an error to
// wait for a detached one in wxWin API
wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
- _T("can't wait for detached thread") );
+ _T("wxThread::Wait(): can't wait for detached thread") );
ExitCode rc = (ExitCode)-1;
- (void)Delete(&rc);
+ (void)m_internal->WaitForTerminate(false, m_critsect, &rc);
m_internal->Free();
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->SetState(STATE_EXITED);
+
return rc;
}
wxThreadError wxThread::Delete(ExitCode *pRc)
{
- ExitCode rc = 0;
-
- // Delete() is always safe to call, so consider all possible states
-
- // we might need to resume the thread, but we might also not need to cancel
- // it if it doesn't run yet
- bool shouldResume = FALSE,
- shouldCancel = TRUE,
- isRunning = FALSE;
-
- // check if the thread already started to run
- {
- wxCriticalSectionLocker lock(m_critsect);
-
- if ( m_internal->GetState() == STATE_NEW )
- {
- // WinThreadStart() will see it and terminate immediately, no need
- // to cancel the thread - but we still need to resume it to let it
- // run
- m_internal->SetState(STATE_EXITED);
-
- Resume(); // it knows about STATE_EXITED special case
-
- shouldCancel = FALSE;
- isRunning = TRUE;
-
- // shouldResume is correctly set to FALSE here
- }
- else
- {
- shouldResume = IsPaused();
- }
- }
-
- // resume the thread if it is paused
- if ( shouldResume )
- Resume();
-
- HANDLE hThread = m_internal->GetHandle();
-
- // does is still run?
- if ( isRunning || IsRunning() )
- {
- if ( IsMain() )
- {
- // set flag for wxIsWaitingForThread()
- gs_waitingForThread = TRUE;
-
-#if wxUSE_GUI
- wxBeginBusyCursor();
-#endif // wxUSE_GUI
- }
-
- // ask the thread to terminate
- if ( shouldCancel )
- {
- wxCriticalSectionLocker lock(m_critsect);
-
- m_internal->Cancel();
- }
-
-#if wxUSE_GUI
- // we can't just wait for the thread to terminate because it might be
- // calling some GUI functions and so it will never terminate before we
- // process the Windows messages that result from these functions
- DWORD result;
- do
- {
- result = ::MsgWaitForMultipleObjects
- (
- 1, // number of objects to wait for
- &hThread, // the objects
- FALSE, // don't wait for all objects
- INFINITE, // no timeout
- QS_ALLEVENTS // return as soon as there are any events
- );
-
- switch ( result )
- {
- case 0xFFFFFFFF:
- // error
- wxLogSysError(_("Can not wait for thread termination"));
- Kill();
- return wxTHREAD_KILLED;
-
- case WAIT_OBJECT_0:
- // thread we're waiting for terminated
- break;
-
- case WAIT_OBJECT_0 + 1:
- // new message arrived, process it
- if ( !wxTheApp->DoMessage() )
- {
- // WM_QUIT received: kill the thread
- Kill();
-
- return wxTHREAD_KILLED;
- }
-
- if ( IsMain() )
- {
- // give the thread we're waiting for chance to exit
- // from the GUI call it might have been in
- if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
- {
- wxMutexGuiLeave();
- }
- }
-
- break;
-
- default:
- wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
- }
- } while ( result != WAIT_OBJECT_0 );
-#else // !wxUSE_GUI
- // simply wait for the thread to terminate
- //
- // OTOH, even console apps create windows (in wxExecute, for WinSock
- // &c), so may be use MsgWaitForMultipleObject() too here?
- if ( WaitForSingleObject(hThread, INFINITE) != WAIT_OBJECT_0 )
- {
- wxFAIL_MSG(wxT("unexpected result of WaitForSingleObject"));
- }
-#endif // wxUSE_GUI/!wxUSE_GUI
-
- if ( IsMain() )
- {
- gs_waitingForThread = FALSE;
-
-#if wxUSE_GUI
- wxEndBusyCursor();
-#endif // wxUSE_GUI
- }
- }
-
- // although the thread might be already in the EXITED state it might not
- // have terminated yet and so we are not sure that it has actually
- // terminated if the "if" above hadn't been taken
- do
- {
- if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
- {
- wxLogLastError(wxT("GetExitCodeThread"));
-
- rc = (ExitCode)-1;
- }
- } while ( (DWORD)rc == STILL_ACTIVE );
+ wxThreadError rc = m_internal->WaitForTerminate(true, m_critsect, pRc);
if ( IsDetached() )
{
- // if the thread exits normally, this is done in WinThreadStart, but in
- // this case it would have been too early because
- // MsgWaitForMultipleObject() would fail if the thread handle was
- // closed while we were waiting on it, so we must do it here
delete this;
}
+ else // joinable
+ {
+ // update the status of the joinable thread
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->SetState(STATE_EXITED);
+ }
- if ( pRc )
- *pRc = rc;
-
- return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
+ return rc;
}
wxThreadError wxThread::Kill()
if ( !IsRunning() )
return wxTHREAD_NOT_RUNNING;
- if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
- {
- wxLogSysError(_("Couldn't terminate thread"));
-
- return wxTHREAD_MISC_ERROR;
- }
-
- m_internal->Free();
+ wxThreadError rc = m_internal->Kill();
if ( IsDetached() )
{
delete this;
}
+ else // joinable
+ {
+ // update the status of the joinable thread
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->SetState(STATE_EXITED);
+ }
- return wxTHREAD_NO_ERROR;
+ return rc;
}
void wxThread::Exit(ExitCode status)
{
delete this;
}
+ else // joinable
+ {
+ // update the status of the joinable thread
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->SetState(STATE_EXITED);
+ }
#ifdef wxUSE_BEGIN_THREAD
_endthreadex((unsigned)status);
// not a mutex, so the names are a bit confusing
// ----------------------------------------------------------------------------
-void WXDLLEXPORT wxMutexGuiEnter()
+void WXDLLIMPEXP_BASE wxMutexGuiEnter()
{
// this would dead lock everything...
wxASSERT_MSG( !wxThread::IsMain(),
gs_critsectGui->Enter();
}
-void WXDLLEXPORT wxMutexGuiLeave()
+void WXDLLIMPEXP_BASE wxMutexGuiLeave()
{
wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
gs_critsectGui->Leave();
}
-void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter()
{
wxASSERT_MSG( wxThread::IsMain(),
wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
}
}
-bool WXDLLEXPORT wxGuiOwnedByMainThread()
+bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread()
{
return gs_bGuiOwnedByMainThread;
}
// wake up the main thread if it's in ::GetMessage()
-void WXDLLEXPORT wxWakeUpMainThread()
+void WXDLLIMPEXP_BASE wxWakeUpMainThread()
{
// sending any message would do - hopefully WM_NULL is harmless enough
if ( !::PostThreadMessage(gs_idMainThread, WM_NULL, 0, 0) )
}
}
-bool WXDLLEXPORT wxIsWaitingForThread()
+bool WXDLLIMPEXP_BASE wxIsWaitingForThread()
{
return gs_waitingForThread;
}
+// ----------------------------------------------------------------------------
+// include common implementation code
+// ----------------------------------------------------------------------------
+
+#include "wx/thrimpl.cpp"
+
#endif // wxUSE_THREADS
-// vi:sts=4:sw=4:et
projects / wxWidgets.git / blobdiff