/////////////////////////////////////////////////////////////////////////////
-// 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"
#define _MT
#endif
-#ifdef __VISUALC__
+#if defined(__BORLANDC__)
+ #if !defined(__MT__)
+ // I can't set -tWM in the IDE (anyone?) so have to do this
+ #define __MT__
+ #endif
+
+ #if !defined(__MFC_COMPAT__)
+ // Needed to know about _beginthreadex etc..
+ #define __MFC_COMPAT__
+ #endif
+#endif // BC++
+
+// define wxUSE_BEGIN_THREAD if the compiler has _beginthreadex() function
+// which should be used instead of Win32 ::CreateThread() if possible
+#if defined(__VISUALC__) || \
+ (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \
+ (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>
+
+ // the return type of the thread function entry point
+ typedef unsigned THREAD_RETVAL;
+
+ // the calling convention of the thread function entry point
+ #define THREAD_CALLCONV __stdcall
+#else
+ // the settings for CreateThread()
+ typedef DWORD THREAD_RETVAL;
+ #define THREAD_CALLCONV WINAPI
#endif
// ----------------------------------------------------------------------------
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:
- HANDLE p_mutex;
+ wxMutexInternal(wxMutexType mutexType);
+ ~wxMutexInternal();
+
+ bool IsOk() const { return m_mutex != NULL; }
+
+ wxMutexError Lock() { return LockTimeout(INFINITE); }
+ wxMutexError TryLock() { return LockTimeout(0); }
+ wxMutexError Unlock();
+
+private:
+ wxMutexError LockTimeout(DWORD milliseconds);
+
+ 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;
- m_internal->p_mutex = CreateMutex(NULL, FALSE, NULL);
- if ( !m_internal->p_mutex )
+ // create a nameless (hence intra process and always private) mutex
+ m_mutex = ::CreateMutex
+ (
+ NULL, // default secutiry attributes
+ FALSE, // not initially locked
+ NULL // no name
+ );
+
+ if ( !m_mutex )
{
- wxLogSysError(_("Can not create mutex."));
+ wxLogLastError(_T("CreateMutex()"));
}
-
- m_locked = 0;
}
-wxMutex::~wxMutex()
+wxMutexInternal::~wxMutexInternal()
{
- if (m_locked > 0)
- wxLogDebug(wxT("Warning: freeing a locked mutex (%d locks)."), m_locked);
- CloseHandle(m_internal->p_mutex);
+ if ( m_mutex )
+ {
+ if ( !::CloseHandle(m_mutex) )
+ {
+ wxLogLastError(_T("CloseHandle(mutex)"));
+ }
+ }
}
-wxMutexError wxMutex::Lock()
+wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds)
{
- DWORD ret;
-
- ret = WaitForSingleObject(m_internal->p_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;
-}
+ // fall through
-wxMutexError wxMutex::TryLock()
-{
- DWORD ret;
-
- ret = WaitForSingleObject(m_internal->p_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->p_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;
}
-// ----------------------------------------------------------------------------
-// wxCondition implementation
-// ----------------------------------------------------------------------------
+// --------------------------------------------------------------------------
+// wxSemaphore
+// --------------------------------------------------------------------------
-class wxConditionInternal
+// a trivial wrapper around Win32 semaphore
+class wxSemaphoreInternal
{
public:
- wxConditionInternal()
- {
- event = ::CreateEvent(
- NULL, // default secutiry
- FALSE, // not manual reset
- FALSE, // nonsignaled initially
- NULL // nameless event
- );
- if ( !event )
- {
- wxLogSysError(_("Can not create event object."));
- }
- waiters = 0;
- }
+ wxSemaphoreInternal(int initialcount, int maxcount);
+ ~wxSemaphoreInternal();
- bool Wait(DWORD timeout)
- {
- waiters++;
+ bool IsOk() const { return m_semaphore != NULL; }
- // FIXME this should be MsgWaitForMultipleObjects() as well probably
- DWORD rc = ::WaitForSingleObject(event, timeout);
+ wxSemaError Wait() { return WaitTimeout(INFINITE); }
- waiters--;
+ wxSemaError TryWait()
+ {
+ wxSemaError rc = WaitTimeout(0);
+ if ( rc == wxSEMA_TIMEOUT )
+ rc = wxSEMA_BUSY;
- return rc != WAIT_TIMEOUT;
+ return rc;
}
- ~wxConditionInternal()
- {
- if ( event )
- {
- if ( !::CloseHandle(event) )
- {
- wxLogLastError("CloseHandle(event)");
- }
- }
- }
+ wxSemaError WaitTimeout(unsigned long milliseconds);
+
+ wxSemaError Post();
- HANDLE event;
- int waiters;
+private:
+ HANDLE m_semaphore;
+
+ DECLARE_NO_COPY_CLASS(wxSemaphoreInternal)
};
-wxCondition::wxCondition()
+wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
{
- m_internal = new wxConditionInternal;
-}
+#ifndef __WXWINCE__
+ if ( maxcount == 0 )
+ {
+ // make it practically infinite
+ maxcount = INT_MAX;
+ }
-wxCondition::~wxCondition()
-{
- delete m_internal;
+ m_semaphore = ::CreateSemaphore
+ (
+ NULL, // default security attributes
+ initialcount,
+ maxcount,
+ NULL // no name
+ );
+#endif
+ if ( !m_semaphore )
+ {
+ wxLogLastError(_T("CreateSemaphore()"));
+ }
}
-void wxCondition::Wait()
+wxSemaphoreInternal::~wxSemaphoreInternal()
{
- (void)m_internal->Wait(INFINITE);
+ if ( m_semaphore )
+ {
+ if ( !::CloseHandle(m_semaphore) )
+ {
+ wxLogLastError(_T("CloseHandle(semaphore)"));
+ }
+ }
}
-bool wxCondition::Wait(unsigned long sec,
- unsigned long nsec)
+wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
{
- return m_internal->Wait(sec*1000 + nsec/1000000);
-}
+ DWORD rc = ::WaitForSingleObject( m_semaphore, milliseconds );
-void wxCondition::Signal()
-{
- // set the event to signaled: if a thread is already waiting on it, it will
- // be woken up, otherwise the event will remain in the signaled state until
- // someone waits on it. In any case, the system will return it to a non
- // signalled state afterwards. If multiple threads are waiting, only one
- // will be woken up.
- if ( !::SetEvent(m_internal->event) )
+ switch ( rc )
{
- wxLogLastError("SetEvent");
+ case WAIT_OBJECT_0:
+ return wxSEMA_NO_ERROR;
+
+ case WAIT_TIMEOUT:
+ return wxSEMA_TIMEOUT;
+
+ default:
+ wxLogLastError(_T("WaitForSingleObject(semaphore)"));
}
+
+ return wxSEMA_MISC_ERROR;
}
-void wxCondition::Broadcast()
+wxSemaError wxSemaphoreInternal::Post()
{
- // this works because all these threads are already waiting and so each
- // SetEvent() inside Signal() is really a PulseEvent() because the event
- // state is immediately returned to non-signaled
- for ( int i = 0; i < m_internal->waiters; i++ )
+#ifndef __WXWINCE__
+ if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) )
+#endif
{
- Signal();
+ wxLogLastError(_T("ReleaseSemaphore"));
+
+ return wxSEMA_MISC_ERROR;
}
+
+ return wxSEMA_NO_ERROR;
}
-// ----------------------------------------------------------------------------
-// wxCriticalSection implementation
-// ----------------------------------------------------------------------------
+// --------------------------------------------------------------------------
+// wxCondition
+// --------------------------------------------------------------------------
-wxCriticalSection::wxCriticalSection()
+// 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
{
- wxASSERT_MSG( sizeof(CRITICAL_SECTION) <= sizeof(m_buffer),
- _T("must increase buffer size in wx/thread.h") );
+public:
+ wxConditionInternal(wxMutex& mutex);
- ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
+ bool IsOk() const { return m_mutex.IsOk() && m_semaphore.IsOk(); }
+
+ wxCondError Wait();
+ wxCondError WaitTimeout(unsigned long milliseconds);
+
+ wxCondError Signal();
+ wxCondError Broadcast();
+
+private:
+ // the number of threads currently waiting for this condition
+ LONG m_numWaiters;
+
+ // 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;
}
-wxCriticalSection::~wxCriticalSection()
+wxCondError wxConditionInternal::Wait()
{
- ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer);
+ // increment the number of waiters
+ ::InterlockedIncrement(&m_numWaiters);
+
+ 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
+ wxSemaError err = m_semaphore.Wait();
+ m_mutex.Lock();
+
+ return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR;
}
-void wxCriticalSection::Enter()
+wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds)
{
- ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer);
+ ::InterlockedIncrement(&m_numWaiters);
+
+ m_mutex.Unlock();
+
+ // a race condition can occur at this point in the code
+ //
+ // please see the comments in Wait(), for details
+
+ wxSemaError err = m_semaphore.WaitTimeout(milliseconds);
+
+ if ( err == wxSEMA_BUSY )
+ {
+ // 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.
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ err = m_semaphore.WaitTimeout(0);
+
+ if ( err != wxSEMA_NO_ERROR )
+ {
+ m_numWaiters--;
+ }
+ }
+
+ m_mutex.Lock();
+
+ return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR;
}
-void wxCriticalSection::Leave()
+wxCondError wxConditionInternal::Signal()
{
- ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer);
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ if ( m_numWaiters > 0 )
+ {
+ // increment the semaphore by 1
+ if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+ return wxCOND_MISC_ERROR;
+
+ m_numWaiters--;
+ }
+
+ return wxCOND_NO_ERROR;
+}
+
+wxCondError wxConditionInternal::Broadcast()
+{
+ wxCriticalSectionLocker lock(m_csWaiters);
+
+ while ( m_numWaiters > 0 )
+ {
+ if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+ return wxCOND_MISC_ERROR;
+
+ m_numWaiters--;
+ }
+
+ return wxCOND_NO_ERROR;
}
// ----------------------------------------------------------------------------
{
if ( !::CloseHandle(m_hThread) )
{
- wxLogLastError("CloseHandle(thread)");
+ wxLogLastError(wxT("CloseHandle(thread)"));
}
m_hThread = 0;
}
// create a new (suspended) thread (for the given thread object)
- bool Create(wxThread *thread);
+ 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();
DWORD GetId() const { return m_tid; }
// thread function
- static DWORD WinThreadStart(wxThread *thread);
+ static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread);
private:
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
+
+ DECLARE_NO_COPY_CLASS(wxThreadInternal)
};
-DWORD wxThreadInternal::WinThreadStart(wxThread *thread)
+THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
{
- // store the thread object in the TLS
- if ( !::TlsSetValue(gs_tlsThisThread, thread) )
- {
- wxLogSysError(_("Can not start thread: error writing TLS."));
+ THREAD_RETVAL rc;
+ bool wasCancelled;
- return (DWORD)-1;
+ // 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 )
+ {
+ rc = (THREAD_RETVAL)-1;
+ wasCancelled = TRUE;
}
+ else // do run thread
+ {
+ // store the thread object in the TLS
+ if ( !::TlsSetValue(gs_tlsThisThread, thread) )
+ {
+ wxLogSysError(_("Can not start thread: error writing TLS."));
- DWORD rc = (DWORD)thread->Entry();
+ return (DWORD)-1;
+ }
- // enter m_critsect before changing the thread state
- thread->m_critsect.Enter();
- bool wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
- thread->m_internal->SetState(STATE_EXITED);
- thread->m_critsect.Leave();
+ 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 it the handle is still
+ // if the thread was cancelled (from Delete()), then its handle is still
// needed there
if ( thread->IsDetached() && !wasCancelled )
{
}
}
-bool wxThreadInternal::Create(wxThread *thread)
+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)
-#ifdef __VISUALC__
- typedef unsigned (__stdcall *RtlThreadStart)(void *);
-
- m_hThread = (HANDLE)_beginthreadex(NULL, 0,
- (RtlThreadStart)
- wxThreadInternal::WinThreadStart,
- thread, CREATE_SUSPENDED,
- (unsigned int *)&m_tid);
-#else // !VC++
+#ifdef wxUSE_BEGIN_THREAD
+
+ // Watcom is reported to not like 0 stack size (which means "use default"
+ // for the other compilers and is also the default value for stackSize)
+#ifdef __WATCOMC__
+ if ( !stackSize )
+ stackSize = 10240;
+#endif // __WATCOMC__
+
+ m_hThread = (HANDLE)_beginthreadex
+ (
+ NULL, // default security
+ stackSize,
+ wxThreadInternal::WinThreadStart, // entry point
+ thread,
+ CREATE_SUSPENDED,
+ (unsigned int *)&m_tid
+ );
+#else // compiler doesn't have _beginthreadex
m_hThread = ::CreateThread
(
NULL, // default security
- 0, // default stack size
- (LPTHREAD_START_ROUTINE) // thread entry point
- wxThreadInternal::WinThreadStart, //
+ stackSize, // stack size
+ wxThreadInternal::WinThreadStart, // thread entry point
(LPVOID)thread, // parameter
CREATE_SUSPENDED, // flags
&m_tid // [out] thread id
);
-#endif // VC++/!VC++
+#endif // _beginthreadex/CreateThread
if ( m_hThread == NULL )
{
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);
return FALSE;
}
- m_state = STATE_RUNNING;
+ // don't change the state from STATE_EXITED because it's special and means
+ // we are going to terminate without running any user code - if we did it,
+ // the codei n Delete() wouldn't work
+ if ( m_state != STATE_EXITED )
+ {
+ m_state = STATE_RUNNING;
+ }
return TRUE;
}
return ::GetCurrentThreadId() == gs_idMainThread;
}
+#ifdef Yield
+#undef Yield
+#endif
+
void wxThread::Yield()
{
// 0 argument to Sleep() is special and means to just give away the rest of
::Sleep(milliseconds);
}
+int wxThread::GetCPUCount()
+{
+ SYSTEM_INFO si;
+ GetSystemInfo(&si);
+
+ return si.dwNumberOfProcessors;
+}
+
+unsigned long wxThread::GetCurrentId()
+{
+ return (unsigned long)::GetCurrentThreadId();
+}
+
+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
+ if ( level == 0 )
+ return 0;
+
+ // get system affinity mask first
+ HANDLE hProcess = ::GetCurrentProcess();
+ DWORD dwProcMask, dwSysMask;
+ if ( ::GetProcessAffinityMask(hProcess, &dwProcMask, &dwSysMask) == 0 )
+ {
+ wxLogLastError(_T("GetProcessAffinityMask"));
+
+ return FALSE;
+ }
+
+ // how many CPUs have we got?
+ if ( dwSysMask == 1 )
+ {
+ // don't bother with all this complicated stuff - on a single
+ // processor system it doesn't make much sense anyhow
+ return level == 1;
+ }
+
+ // calculate the process mask: it's a bit vector with one bit per
+ // processor; we want to schedule the process to run on first level
+ // CPUs
+ DWORD bit = 1;
+ while ( bit )
+ {
+ if ( dwSysMask & bit )
+ {
+ // ok, we can set this bit
+ dwProcMask |= bit;
+
+ // another process added
+ if ( !--level )
+ {
+ // and that's enough
+ break;
+ }
+ }
+
+ // next bit
+ bit <<= 1;
+ }
+
+ // could we set all bits?
+ if ( level != 0 )
+ {
+ wxLogDebug(_T("bad level %u in wxThread::SetConcurrency()"), level);
+
+ return FALSE;
+ }
+
+ // set it: we can't link to SetProcessAffinityMask() because it doesn't
+ // exist in Win9x, use RT binding instead
+
+ typedef BOOL (*SETPROCESSAFFINITYMASK)(HANDLE, DWORD);
+
+ // can use static var because we're always in the main thread here
+ static SETPROCESSAFFINITYMASK pfnSetProcessAffinityMask = NULL;
+
+ if ( !pfnSetProcessAffinityMask )
+ {
+ HMODULE hModKernel = ::LoadLibrary(_T("kernel32"));
+ if ( hModKernel )
+ {
+ pfnSetProcessAffinityMask = (SETPROCESSAFFINITYMASK)
+ ::GetProcAddress(hModKernel, "SetProcessAffinityMask");
+ }
+
+ // we've discovered a MT version of Win9x!
+ wxASSERT_MSG( pfnSetProcessAffinityMask,
+ _T("this system has several CPUs but no SetProcessAffinityMask function?") );
+ }
+
+ if ( !pfnSetProcessAffinityMask )
+ {
+ // msg given above - do it only once
+ return FALSE;
+ }
+
+ if ( pfnSetProcessAffinityMask(hProcess, dwProcMask) == 0 )
+ {
+ wxLogLastError(_T("SetProcessAffinityMask"));
+
+ return FALSE;
+ }
+#endif
+ return TRUE;
+}
+
// ctor and dtor
// -------------
// create/start thread
// -------------------
-wxThreadError wxThread::Create()
+wxThreadError wxThread::Create(unsigned int stackSize)
{
wxCriticalSectionLocker lock(m_critsect);
- if ( !m_internal->Create(this) )
+ if ( !m_internal->Create(this, stackSize) )
return wxTHREAD_NO_RESOURCE;
return wxTHREAD_NO_ERROR;
// 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
- if ( IsPaused() )
- Resume();
-
- HANDLE hThread = m_internal->GetHandle();
-
- if ( IsRunning() )
- {
- if ( IsMain() )
- {
- // set flag for wxIsWaitingForThread()
- gs_waitingForThread = TRUE;
-
-#if wxUSE_GUI
- wxBeginBusyCursor();
-#endif // wxUSE_GUI
- }
-
- // ask the thread to terminate
- {
- 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("GetExitCodeThread");
-
- rc = (ExitCode)-1;
- }
+ 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 therad 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);
+ }
- 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 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 __VISUALC__
+#ifdef wxUSE_BEGIN_THREAD
_endthreadex((unsigned)status);
#else // !VC++
::ExitThread((DWORD)status);
// in normal circumstances it will only happen if all other
// TLS_MINIMUM_AVAILABLE (>= 64) indices are already taken - in other
// words, this should never happen
- wxLogSysError(_("Thread module initialization failed: "
- "impossible to allocate index in thread "
- "local storage"));
+ wxLogSysError(_("Thread module initialization failed: impossible to allocate index in thread local storage"));
return FALSE;
}
::TlsFree(gs_tlsThisThread);
gs_tlsThisThread = 0xFFFFFFFF;
- wxLogSysError(_("Thread module initialization failed: "
- "can not store value in thread local storage"));
+ wxLogSysError(_("Thread module initialization failed: can not store value in thread local storage"));
return FALSE;
}
{
if ( !::TlsFree(gs_tlsThisThread) )
{
- wxLogLastError("TlsFree failed.");
+ wxLogLastError(wxT("TlsFree failed."));
}
if ( gs_critsectGui )
// 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);
}
else
{
- // decrement the number of waiters now
+ // decrement the number of threads waiting for GUI access now
wxASSERT_MSG( gs_nWaitingForGui > 0,
wxT("calling wxMutexGuiLeave() without entering it first?") );
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) )
{
// should never happen
- wxLogLastError("PostThreadMessage(WM_NULL)");
+ wxLogLastError(wxT("PostThreadMessage(WM_NULL)"));
}
}
-bool WXDLLEXPORT wxIsWaitingForThread()
+bool WXDLLIMPEXP_BASE wxIsWaitingForThread()
{
return gs_waitingForThread;
}
+// ----------------------------------------------------------------------------
+// include common implementation code
+// ----------------------------------------------------------------------------
+
+#include "wx/thrimpl.cpp"
+
#endif // wxUSE_THREADS
+
projects / wxWidgets.git / blobdiff