/////////////////////////////////////////////////////////////////////////////
-// 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
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "thread.h"
#endif
#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
#if defined(__VISUALC__) || \
(defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \
(defined(__GNUG__) && defined(__MSVCRT__)) || \
- defined(__WATCOMC__)
+ 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>
// calling wxMutexGuiEnter()
static DWORD gs_idMainThread = 0;
-// if it's FALSE, some secondary thread is holding the GUI lock
-static bool gs_bGuiOwnedByMainThread = TRUE;
+// if it's false, some secondary thread is holding the GUI lock
+static bool gs_bGuiOwnedByMainThread = true;
// critical section which controls access to all GUI functions: any secondary
// thread (i.e. except the main one) must enter this crit section before doing
// critical section which protects gs_nWaitingForGui variable
static wxCriticalSection *gs_critsectWaitingForGui = NULL;
+// critical section which serializes WinThreadStart() and WaitForTerminate()
+// (this is a potential bottleneck, we use a single crit sect for all threads
+// in the system, but normally time spent inside it should be quite short)
+static wxCriticalSection *gs_critsectThreadDelete = NULL;
+
// number of threads waiting for GUI in wxMutexGuiEnter()
static size_t gs_nWaitingForGui = 0;
// are we waiting for a thread termination?
-static bool gs_waitingForThread = FALSE;
+static bool gs_waitingForThread = false;
// ============================================================================
-// Windows implementation of thread classes
+// Windows implementation of thread and related classes
// ============================================================================
// ----------------------------------------------------------------------------
-// wxMutex implementation
+// wxCriticalSection
// ----------------------------------------------------------------------------
-class wxMutexInternal
-{
-public:
- wxMutexInternal()
- {
- m_mutex = ::CreateMutex(NULL, FALSE, NULL);
- if ( !m_mutex )
- {
- wxLogSysError(_("Can not create mutex"));
- }
- }
-
- ~wxMutexInternal() { if ( m_mutex ) ::CloseHandle(m_mutex); }
-
-public:
- HANDLE m_mutex;
-};
-
-wxMutex::wxMutex()
-{
- m_internal = new wxMutexInternal;
-
- m_locked = 0;
-}
-
-wxMutex::~wxMutex()
+wxCriticalSection::wxCriticalSection()
{
- if ( m_locked > 0 )
- {
- wxLogDebug(_T("Warning: freeing a locked mutex (%d locks)."), m_locked);
- }
+ wxCOMPILE_TIME_ASSERT( sizeof(CRITICAL_SECTION) <= sizeof(wxCritSectBuffer),
+ wxCriticalSectionBufferTooSmall );
- delete m_internal;
+ ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
}
-wxMutexError wxMutex::Lock()
+wxCriticalSection::~wxCriticalSection()
{
- DWORD ret;
-
- ret = WaitForSingleObject(m_internal->m_mutex, INFINITE);
- switch ( ret )
- {
- case WAIT_ABANDONED:
- return wxMUTEX_BUSY;
-
- case WAIT_OBJECT_0:
- // ok
- break;
-
- case WAIT_FAILED:
- wxLogSysError(_("Couldn't acquire a mutex lock"));
- return wxMUTEX_MISC_ERROR;
-
- case WAIT_TIMEOUT:
- default:
- wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
- }
-
- m_locked++;
- return wxMUTEX_NO_ERROR;
+ ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer);
}
-wxMutexError wxMutex::TryLock()
+void wxCriticalSection::Enter()
{
- DWORD ret;
-
- ret = WaitForSingleObject(m_internal->m_mutex, 0);
- if (ret == WAIT_TIMEOUT || ret == WAIT_ABANDONED)
- return wxMUTEX_BUSY;
-
- m_locked++;
- return wxMUTEX_NO_ERROR;
+ ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer);
}
-wxMutexError wxMutex::Unlock()
+void wxCriticalSection::Leave()
{
- if (m_locked > 0)
- m_locked--;
-
- BOOL ret = ReleaseMutex(m_internal->m_mutex);
- if ( ret == 0 )
- {
- wxLogSysError(_("Couldn't release a mutex"));
- return wxMUTEX_MISC_ERROR;
- }
-
- return wxMUTEX_NO_ERROR;
+ ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer);
}
-// ==========================================================================
-// wxSemaphore
-// ==========================================================================
-
-// --------------------------------------------------------------------------
-// wxSemaphoreInternal
-// --------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// wxMutex
+// ----------------------------------------------------------------------------
-class wxSemaphoreInternal
+class wxMutexInternal
{
public:
- wxSemaphoreInternal( int initialcount = 0, int maxcount = 0 );
- ~wxSemaphoreInternal();
-
- void Wait();
- bool TryWait();
+ wxMutexInternal(wxMutexType mutexType);
+ ~wxMutexInternal();
- bool Wait( unsigned long timeout_millis );
+ bool IsOk() const { return m_mutex != NULL; }
- void Post();
+ wxMutexError Lock() { return LockTimeout(INFINITE); }
+ wxMutexError TryLock() { return LockTimeout(0); }
+ wxMutexError Unlock();
private:
- HANDLE m_semaphore;
+ wxMutexError LockTimeout(DWORD milliseconds);
+
+ HANDLE m_mutex;
+
+ DECLARE_NO_COPY_CLASS(wxMutexInternal)
};
-wxSemaphoreInternal::wxSemaphoreInternal( int initialcount, int maxcount )
+// all mutexes are recursive under Win32 so we don't use mutexType
+wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(mutexType))
{
- if ( maxcount == 0 )
- {
- // make it practically infinite
- maxcount = INT_MAX;
- }
+ // 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_semaphore = ::CreateSemaphore( NULL, initialcount, maxcount, NULL );
- if ( !m_semaphore )
+ if ( !m_mutex )
{
- wxLogLastError(_T("CreateSemaphore()"));
+ wxLogLastError(_T("CreateMutex()"));
}
}
-wxSemaphoreInternal::~wxSemaphoreInternal()
+wxMutexInternal::~wxMutexInternal()
{
- CloseHandle( m_semaphore );
-}
-
-void wxSemaphoreInternal::Wait()
-{
- if ( ::WaitForSingleObject( m_semaphore, INFINITE ) != WAIT_OBJECT_0 )
+ if ( m_mutex )
{
- wxLogLastError(_T("WaitForSingleObject"));
+ if ( !::CloseHandle(m_mutex) )
+ {
+ wxLogLastError(_T("CloseHandle(mutex)"));
+ }
}
}
-bool wxSemaphoreInternal::TryWait()
+wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds)
{
- return Wait(0);
-}
+ DWORD rc = ::WaitForSingleObject(m_mutex, milliseconds);
+ if ( rc == WAIT_ABANDONED )
+ {
+ // the previous caller died without releasing the mutex, but now we can
+ // really lock it
+ wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED"));
-bool wxSemaphoreInternal::Wait( unsigned long timeout_millis )
-{
- DWORD result = ::WaitForSingleObject( m_semaphore, timeout_millis );
+ // use 0 timeout, normally we should always get it
+ rc = ::WaitForSingleObject(m_mutex, 0);
+ }
- switch ( result )
+ switch ( rc )
{
case WAIT_OBJECT_0:
- return TRUE;
+ // ok
+ break;
case WAIT_TIMEOUT:
- break;
+ return wxMUTEX_BUSY;
+ case WAIT_ABANDONED: // checked for above
default:
- wxLogLastError(_T("WaitForSingleObject()"));
+ wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
+ // fall through
+
+ case WAIT_FAILED:
+ wxLogLastError(_T("WaitForSingleObject(mutex)"));
+ return wxMUTEX_MISC_ERROR;
}
- return FALSE;
+ return wxMUTEX_NO_ERROR;
}
-void wxSemaphoreInternal::Post()
+wxMutexError wxMutexInternal::Unlock()
{
- if ( !::ReleaseSemaphore( m_semaphore, 1, NULL ) )
+ if ( !::ReleaseMutex(m_mutex) )
{
- wxLogLastError(_T("ReleaseSemaphore"));
+ wxLogLastError(_T("ReleaseMutex()"));
+
+ return wxMUTEX_MISC_ERROR;
}
+
+ return wxMUTEX_NO_ERROR;
}
// --------------------------------------------------------------------------
// 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 );
-}
-
-void wxSemaphore::Post()
+// a trivial wrapper around Win32 semaphore
+class wxSemaphoreInternal
{
- m_internal->Post();
-}
-
+public:
+ wxSemaphoreInternal(int initialcount, int maxcount);
+ ~wxSemaphoreInternal();
-// ==========================================================================
-// wxCondition
-// ==========================================================================
+ bool IsOk() const { return m_semaphore != NULL; }
-// --------------------------------------------------------------------------
-// wxConditionInternal
-// --------------------------------------------------------------------------
+ wxSemaError Wait() { return WaitTimeout(INFINITE); }
-class wxConditionInternal
-{
-public:
- wxConditionInternal( wxMutex *mutex );
- ~wxConditionInternal();
-
- void Wait();
+ wxSemaError TryWait()
+ {
+ wxSemaError rc = WaitTimeout(0);
+ if ( rc == wxSEMA_TIMEOUT )
+ rc = wxSEMA_BUSY;
- bool Wait( unsigned long timeout_millis );
+ return rc;
+ }
- void Signal();
+ wxSemaError WaitTimeout(unsigned long milliseconds);
- void Broadcast();
+ wxSemaError Post();
private:
- int m_numWaiters;
- wxMutex m_mutexNumWaiters;
-
- wxMutex *m_mutex;
+ HANDLE m_semaphore;
- wxSemaphore m_semaphore;
+ DECLARE_NO_COPY_CLASS(wxSemaphoreInternal)
};
-wxConditionInternal::wxConditionInternal( wxMutex *mutex )
-{
- m_mutex = mutex;
-
- m_numWaiters = 0;
-}
-
-wxConditionInternal::~wxConditionInternal()
-{
-}
-
-void wxConditionInternal::Wait()
+wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
{
- // increment the number of waiters
- m_mutexNumWaiters.Lock();
- m_numWaiters++;
- m_mutexNumWaiters.Unlock();
-
- m_mutex->Unlock();
-
- // a potential race condition can occur here
- //
- // after a thread increments nwaiters, and unlocks the mutex and before the
- // semaphore.Wait() is called, if another thread can cause a signal to be
- // generated
- //
- // this race condition is handled by using a semaphore and incrementing the
- // semaphore only if 'nwaiters' is greater that zero since the semaphore,
- // can 'remember' signals the race condition will not occur
-
- // wait ( if necessary ) and decrement semaphore
- m_semaphore.Wait();
-
- m_mutex->Lock();
-}
-
-bool wxConditionInternal::Wait( unsigned long timeout_millis )
-{
- m_mutexNumWaiters.Lock();
- m_numWaiters++;
- m_mutexNumWaiters.Unlock();
-
- m_mutex->Unlock();
-
- // a race condition can occur at this point in the code
- //
- // please see the comments in Wait(), for details
-
- bool success = TRUE;
-
- bool result = m_semaphore.Wait( timeout_millis );
-
- if ( !result )
+#if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300)
+ if ( maxcount == 0 )
{
- // another potential race condition exists here it is caused when a
- // 'waiting' thread timesout, and returns from WaitForSingleObject, but
- // has not yet decremented 'nwaiters'.
- //
- // at this point if another thread calls signal() then the semaphore
- // will be incremented, but the waiting thread will miss it.
- //
- // to handle this particular case, the waiting thread calls
- // WaitForSingleObject again with a timeout of 0, after locking
- // '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 );
-
- if ( !result )
- {
- m_numWaiters--;
- success = FALSE;
- }
-
- m_mutexNumWaiters.Unlock();
+ // make it practically infinite
+ maxcount = INT_MAX;
}
- m_mutex->Lock();
-
- return success;
-}
-
-void wxConditionInternal::Signal()
-{
- m_mutexNumWaiters.Lock();
-
- if ( m_numWaiters > 0 )
+ m_semaphore = ::CreateSemaphore
+ (
+ NULL, // default security attributes
+ initialcount,
+ maxcount,
+ NULL // no name
+ );
+#endif
+ if ( !m_semaphore )
{
- // increment the semaphore by 1
- m_semaphore.Post();
-
- m_numWaiters--;
+ wxLogLastError(_T("CreateSemaphore()"));
}
-
- m_mutexNumWaiters.Unlock();
}
-void wxConditionInternal::Broadcast()
+wxSemaphoreInternal::~wxSemaphoreInternal()
{
- m_mutexNumWaiters.Lock();
-
- while ( m_numWaiters > 0 )
+ if ( m_semaphore )
{
- m_semaphore.Post();
- m_numWaiters--;
+ if ( !::CloseHandle(m_semaphore) )
+ {
+ wxLogLastError(_T("CloseHandle(semaphore)"));
+ }
}
-
- m_mutexNumWaiters.Unlock();
}
-// ----------------------------------------------------------------------------
-// wxCondition implementation
-// ----------------------------------------------------------------------------
-
-wxCondition::wxCondition( wxMutex *mutex )
+wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
{
- if ( !mutex )
- {
- wxFAIL_MSG( _T("NULL mutex in wxCondition ctor") );
+ DWORD rc = ::WaitForSingleObject( m_semaphore, milliseconds );
- m_internal = NULL;
- }
- else
+ switch ( rc )
{
- m_internal = new wxConditionInternal( mutex );
- }
-}
-
-wxCondition::~wxCondition()
-{
- delete m_internal;
-}
-
-void wxCondition::Wait()
-{
- if ( m_internal )
- m_internal->Wait();
-}
+ case WAIT_OBJECT_0:
+ return wxSEMA_NO_ERROR;
-bool wxCondition::Wait( unsigned long timeout_millis )
-{
- return m_internal ? m_internal->Wait(timeout_millis) : FALSE;
-}
+ case WAIT_TIMEOUT:
+ return wxSEMA_TIMEOUT;
-void wxCondition::Signal()
-{
- if ( m_internal )
- m_internal->Signal();
-}
+ default:
+ wxLogLastError(_T("WaitForSingleObject(semaphore)"));
+ }
-void wxCondition::Broadcast()
-{
- if ( m_internal )
- m_internal->Broadcast();
+ return wxSEMA_MISC_ERROR;
}
-// ----------------------------------------------------------------------------
-// wxCriticalSection implementation
-// ----------------------------------------------------------------------------
-
-wxCriticalSection::wxCriticalSection()
+wxSemaError wxSemaphoreInternal::Post()
{
-#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") );
+#if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300)
+ if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) )
#endif
+ {
+ wxLogLastError(_T("ReleaseSemaphore"));
- ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
-}
-
-wxCriticalSection::~wxCriticalSection()
-{
- ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer);
-}
-
-void wxCriticalSection::Enter()
-{
- ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer);
-}
+ return wxSEMA_MISC_ERROR;
+ }
-void wxCriticalSection::Leave()
-{
- ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer);
+ return wxSEMA_NO_ERROR;
}
// ----------------------------------------------------------------------------
class wxThreadInternal
{
public:
- wxThreadInternal()
+ wxThreadInternal(wxThread *thread)
{
+ m_thread = thread;
m_hThread = 0;
m_state = STATE_NEW;
m_priority = WXTHREAD_DEFAULT_PRIORITY;
+ m_nRef = 1;
}
~wxThreadInternal()
// 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(wxCriticalSection& cs,
+ wxThread::ExitCode *pRc,
+ wxThread *threadToDelete = NULL);
+
+ // kill the thread unconditionally
+ wxThreadError Kill();
+
// suspend/resume/terminate
bool Suspend();
bool Resume();
// thread function
static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread);
+ void KeepAlive()
+ {
+ if ( m_thread->IsDetached() )
+ ::InterlockedIncrement(&m_nRef);
+ }
+
+ void LetDie()
+ {
+ if ( m_thread->IsDetached() && !::InterlockedDecrement(&m_nRef) )
+ delete m_thread;
+ }
+
private:
+ // the thread we're associated with
+ wxThread *m_thread;
+
HANDLE m_hThread; // handle of the thread
wxThreadState m_state; // state, see wxThreadState enum
unsigned int m_priority; // thread priority in "wx" units
DWORD m_tid; // thread id
+
+ // number of threads which need this thread to remain alive, when the count
+ // reaches 0 we kill the owning wxThread -- and die ourselves with it
+ LONG m_nRef;
+
+ DECLARE_NO_COPY_CLASS(wxThreadInternal)
+};
+
+// small class which keeps a thread alive during its lifetime
+class wxThreadKeepAlive
+{
+public:
+ wxThreadKeepAlive(wxThreadInternal& thrImpl) : m_thrImpl(thrImpl)
+ { m_thrImpl.KeepAlive(); }
+ ~wxThreadKeepAlive()
+ { m_thrImpl.LetDie(); }
+
+private:
+ wxThreadInternal& m_thrImpl;
};
+
THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
{
THREAD_RETVAL rc;
- bool wasCancelled;
+
+ wxThread * const thread = (wxThread *)param;
// first of all, check whether we hadn't been cancelled already and don't
// start the user code at all then
- wxThread *thread = (wxThread *)param;
- if ( thread->m_internal->GetState() == STATE_EXITED )
+ bool isExited = (thread->m_internal->GetState() == STATE_EXITED);
+
+ if ( isExited )
{
rc = (THREAD_RETVAL)-1;
- wasCancelled = TRUE;
}
else // do run thread
{
}
rc = (THREAD_RETVAL)thread->Entry();
-
- // enter m_critsect before changing the thread state
- thread->m_critsect.Enter();
- wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
- thread->m_internal->SetState(STATE_EXITED);
- thread->m_critsect.Leave();
}
thread->OnExit();
- // if the thread was cancelled (from Delete()), then its handle is still
- // needed there
- if ( thread->IsDetached() && !wasCancelled )
+ // save IsDetached because thread object can be deleted by joinable
+ // threads after state is changed to STATE_EXITED.
+ bool isDetached = thread->IsDetached();
+
+ if (!isExited)
{
- // auto delete
- delete thread;
+ // enter m_critsect before changing the thread state
+ wxCriticalSectionLocker lock(thread->m_critsect);
+ thread->m_internal->SetState(STATE_EXITED);
}
- //else: the joinable threads handle will be closed when Wait() is done
+
+ // the thread may delete itself now if it wants, we don't need it any more
+ if (isDetached) thread->m_internal->LetDie();
return rc;
}
{
m_priority = priority;
- // translate wxWindows priority to the Windows one
+ // translate wxWidgets priority to the Windows one
int win_priority;
if (m_priority <= 20)
win_priority = THREAD_PRIORITY_LOWEST;
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)
{
wxLogSysError(_("Can't create thread"));
- return FALSE;
+ return false;
}
if ( m_priority != WXTHREAD_DEFAULT_PRIORITY )
SetPriority(m_priority);
}
- return TRUE;
+ 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(wxCriticalSection& cs,
+ wxThread::ExitCode *pRc,
+ wxThread *threadToDelete)
+{
+ // prevent the thread C++ object from disappearing as long as we are using
+ // it here
+ wxThreadKeepAlive keepAlive(*this);
+
+
+ // we may either wait passively for the thread to terminate (when called
+ // from Wait()) or ask it to terminate (when called from Delete())
+ bool shouldDelete = threadToDelete != NULL;
+
+ 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 ( shouldDelete )
+ {
+ // 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
+
+ shouldDelete = false;
+ }
+
+ isRunning = true;
+
+ // shouldResume is correctly set to false here
+ }
+ else if ( m_state == STATE_EXITED )
+ {
+ return wxTHREAD_NOT_RUNNING;
+ }
+ else // running (but maybe paused or cancelled)
+ {
+ shouldResume = m_state == STATE_PAUSED;
+ }
+ }
+
+ // resume the thread if it is paused
+ if ( shouldResume )
+ Resume();
+
+ // is it still running?
+ if ( isRunning || m_state == STATE_RUNNING )
+ {
+ if ( wxThread::IsMain() )
+ {
+ // set flag for wxIsWaitingForThread()
+ gs_waitingForThread = true;
+ }
+
+ // ask the thread to terminate
+ if ( shouldDelete )
+ {
+ 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 wxDUMMY_INITIALIZE(0);
+ 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 wxWidgets)
+ // 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
+ for ( ;; )
+ {
+ if ( !::GetExitCodeThread(m_hThread, (LPDWORD)&rc) )
+ {
+ wxLogLastError(wxT("GetExitCodeThread"));
+
+ rc = (wxThread::ExitCode)-1;
+
+ break;
+ }
+
+ if ( (DWORD)rc != STILL_ACTIVE )
+ break;
+
+ // give the other thread some time to terminate, otherwise we may be
+ // starving it
+ ::Sleep(1);
+ }
+
+ if ( pRc )
+ *pRc = rc;
+
+ // we don't need the thread handle any more in any case
+ Free();
+
+
+ return rc == (wxThread::ExitCode)-1 ? wxTHREAD_MISC_ERROR
+ : wxTHREAD_NO_ERROR;
}
bool wxThreadInternal::Suspend()
{
wxLogSysError(_("Can not suspend thread %x"), m_hThread);
- return FALSE;
+ return false;
}
m_state = STATE_PAUSED;
- return TRUE;
+ return true;
}
bool wxThreadInternal::Resume()
{
wxLogSysError(_("Can not resume thread %x"), m_hThread);
- return FALSE;
+ return false;
}
// don't change the state from STATE_EXITED because it's special and means
m_state = STATE_RUNNING;
}
- return TRUE;
+ return true;
}
// static functions
bool wxThread::IsMain()
{
- return ::GetCurrentThreadId() == gs_idMainThread;
+ return ::GetCurrentThreadId() == gs_idMainThread || gs_idMainThread == 0;
}
-#ifdef Yield
-#undef Yield
-#endif
-
void wxThread::Yield()
{
// 0 argument to Sleep() is special and means to just give away the rest of
bool wxThread::SetConcurrency(size_t level)
{
+#ifdef __WXWINCE__
+ wxUnusedVar(level);
+ return false;
+#else
wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
// ok only for the default one
// get system affinity mask first
HANDLE hProcess = ::GetCurrentProcess();
- DWORD dwProcMask, dwSysMask;
+ DWORD_PTR dwProcMask, dwSysMask;
if ( ::GetProcessAffinityMask(hProcess, &dwProcMask, &dwSysMask) == 0 )
{
wxLogLastError(_T("GetProcessAffinityMask"));
- return FALSE;
+ return false;
}
// how many CPUs have we got?
{
wxLogDebug(_T("bad level %u in wxThread::SetConcurrency()"), level);
- return FALSE;
+ return false;
}
// set it: we can't link to SetProcessAffinityMask() because it doesn't
if ( !pfnSetProcessAffinityMask )
{
// msg given above - do it only once
- return FALSE;
+ return false;
}
if ( pfnSetProcessAffinityMask(hProcess, dwProcMask) == 0 )
{
wxLogLastError(_T("SetProcessAffinityMask"));
- return FALSE;
+ return false;
}
- return TRUE;
+ return true;
+#endif // __WXWINCE__/!__WXWINCE__
}
// ctor and dtor
wxThread::wxThread(wxThreadKind kind)
{
- m_internal = new wxThreadInternal();
+ m_internal = new wxThreadInternal(this);
m_isDetached = kind == wxTHREAD_DETACHED;
}
// 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);
-
- m_internal->Free();
+ (void)m_internal->WaitForTerminate(m_critsect, &rc);
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
- }
- }
-
- if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
- {
- wxLogLastError(wxT("GetExitCodeThread"));
-
- rc = (ExitCode)-1;
- }
-
- 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;
- }
-
- wxASSERT_MSG( (DWORD)rc != STILL_ACTIVE,
- wxT("thread must be already terminated.") );
-
- if ( pRc )
- *pRc = rc;
-
- return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
+ return m_internal->WaitForTerminate(m_critsect, pRc, this);
}
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);
// words, this should never happen
wxLogSysError(_("Thread module initialization failed: impossible to allocate index in thread local storage"));
- return FALSE;
+ return false;
}
// main thread doesn't have associated wxThread object, so store 0 in the
wxLogSysError(_("Thread module initialization failed: can not store value in thread local storage"));
- return FALSE;
+ return false;
}
gs_critsectWaitingForGui = new wxCriticalSection();
gs_critsectGui = new wxCriticalSection();
gs_critsectGui->Enter();
+ gs_critsectThreadDelete = new wxCriticalSection;
+
// no error return for GetCurrentThreadId()
gs_idMainThread = ::GetCurrentThreadId();
- return TRUE;
+ return true;
}
void wxThreadModule::OnExit()
wxLogLastError(wxT("TlsFree failed."));
}
+ delete gs_critsectThreadDelete;
+ gs_critsectThreadDelete = NULL;
+
if ( gs_critsectGui )
{
gs_critsectGui->Leave();
// 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);
if ( wxThread::IsMain() )
{
- gs_bGuiOwnedByMainThread = FALSE;
+ gs_bGuiOwnedByMainThread = false;
}
else
{
gs_critsectGui->Leave();
}
-void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter()
{
wxASSERT_MSG( wxThread::IsMain(),
wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
{
gs_critsectGui->Enter();
- gs_bGuiOwnedByMainThread = TRUE;
+ gs_bGuiOwnedByMainThread = true;
}
//else: already have it, nothing to do
}
}
}
-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