/////////////////////////////////////////////////////////////////////////////
// Name: thread.cpp
-// Purpose: wxThread Implementation. For Unix ports, see e.g. src/gtk
+// Purpose: wxThread Implementation
// Author: Original from Wolfram Gloger/Guilhem Lavaux
-// Modified by:
+// Modified by: Vadim Zeitlin to make it work :-)
// Created: 04/22/98
// RCS-ID: $Id$
-// Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998)
+// Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
+// Vadim Zeitlin (1999)
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
-#pragma implementation "thread.h"
+ #pragma implementation "thread.h"
#endif
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#if defined(__BORLANDC__)
+ #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+ #include "wx/wx.h"
+#endif
+
+#if wxUSE_THREADS
+
+#include <stdio.h>
+
+#include <windows.h>
+
#include "wx/module.h"
#include "wx/thread.h"
-#include "wx/utils.h"
-enum thread_state {
- STATE_IDLE = 0,
- STATE_RUNNING,
- STATE_CANCELED,
- STATE_EXITED
+// the possible states of the thread ("=>" shows all possible transitions from
+// this state)
+enum wxThreadState
+{
+ STATE_NEW, // didn't start execution yet (=> RUNNING)
+ STATE_RUNNING, // thread is running (=> PAUSED, CANCELED)
+ STATE_PAUSED, // thread is temporarily suspended (=> RUNNING)
+ STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED)
+ STATE_EXITED // thread is terminating
};
-/////////////////////////////////////////////////////////////////////////////
-// Static variables
-/////////////////////////////////////////////////////////////////////////////
+// ----------------------------------------------------------------------------
+// static variables
+// ----------------------------------------------------------------------------
-wxMutex *wxMainMutex; // controls access to all GUI functions
+// if it's FALSE, some secondary thread is holding the GUI lock
+static bool s_bGuiOwnedByMainThread = TRUE;
-/////////////////////////////////////////////////////////////////////////////
-// Windows implementation
-/////////////////////////////////////////////////////////////////////////////
+// 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
+// any GUI calls
+static wxCriticalSection *s_critsectGui = NULL;
+
+// critical section which protects s_nWaitingForGui variable
+static wxCriticalSection *s_critsectWaitingForGui = NULL;
+
+// number of threads waiting for GUI in wxMutexGuiEnter()
+static size_t s_nWaitingForGui = 0;
+
+// are we waiting for a thread termination?
+static bool s_waitingForThread = FALSE;
+
+// ============================================================================
+// Windows implementation of thread classes
+// ============================================================================
-class wxMutexInternal {
+// ----------------------------------------------------------------------------
+// wxMutex implementation
+// ----------------------------------------------------------------------------
+class wxMutexInternal
+{
public:
- // TODO: internal mutex handle
+ Handle p_mutex;
};
wxMutex::wxMutex()
{
p_internal = new wxMutexInternal;
- // TODO: create internal mutext handle
+// p_internal->p_mutex = CreateMutex(NULL, FALSE, NULL);
+ if ( !p_internal->p_mutex )
+ {
+ wxLogSysError(_("Can not create mutex."));
+ }
+
m_locked = 0;
}
wxMutex::~wxMutex()
{
if (m_locked > 0)
- wxDebugMsg("wxMutex warning: freeing a locked mutex (%d locks)\n", m_locked);
- // TODO: free internal mutext handle
+ wxLogDebug(wxT("Warning: freeing a locked mutex (%d locks)."), m_locked);
+// CloseHandle(p_internal->p_mutex);
}
wxMutexError wxMutex::Lock()
{
- // TODO
+/*
+ DWORD ret;
+
+ ret = WaitForSingleObject(p_internal->p_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;
}
wxMutexError wxMutex::TryLock()
{
- // TODO
+/*
+ DWORD ret;
+
+ ret = WaitForSingleObject(p_internal->p_mutex, 0);
+ if (ret == WAIT_TIMEOUT || ret == WAIT_ABANDONED)
+ return wxMUTEX_BUSY;
+
m_locked++;
+*/
return wxMUTEX_NO_ERROR;
}
{
if (m_locked > 0)
m_locked--;
-
- // TODO
+/*
+ BOOL ret = ReleaseMutex(p_internal->p_mutex);
+ if ( ret == 0 )
+ {
+ wxLogSysError(_("Couldn't release a mutex"));
+ return wxMUTEX_MISC_ERROR;
+ }
+*/
return wxMUTEX_NO_ERROR;
}
-class wxConditionInternal {
+// ----------------------------------------------------------------------------
+// wxCondition implementation
+// ----------------------------------------------------------------------------
+
+class wxConditionInternal
+{
public:
- // TODO: internal handle
- int waiters;
+ Handle event;
+ int waiters;
};
wxCondition::wxCondition()
{
p_internal = new wxConditionInternal;
- // TODO: create internal handle
+// p_internal->event = CreateEvent(NULL, FALSE, FALSE, NULL);
+ if ( !p_internal->event )
+ {
+ wxLogSysError(_("Can not create event object."));
+ }
+
p_internal->waiters = 0;
}
wxCondition::~wxCondition()
{
- // TODO: destroy internal handle
+// CloseHandle(p_internal->event);
}
void wxCondition::Wait(wxMutex& mutex)
{
mutex.Unlock();
p_internal->waiters++;
- // TODO wait here
+// WaitForSingleObject(p_internal->event, INFINITE);
p_internal->waiters--;
mutex.Lock();
}
-bool wxCondition::Wait(wxMutex& mutex, unsigned long sec,
+bool wxCondition::Wait(wxMutex& mutex,
+ unsigned long sec,
unsigned long nsec)
{
+// DWORD ret;
+
mutex.Unlock();
p_internal->waiters++;
-
- // TODO wait here
+ // ret = WaitForSingleObject(p_internal->event, (sec*1000)+(nsec/1000000));
p_internal->waiters--;
mutex.Lock();
- return FALSE;
+ return TRUE; // false for timeout
}
void wxCondition::Signal()
{
- // TODO
+// SetEvent(p_internal->event);
}
void wxCondition::Broadcast()
{
- // TODO
+ int i;
+
+ for (i=0;i<p_internal->waiters;i++)
+ {
+// if ( SetEvent(p_internal->event) == 0 )
+ {
+ wxLogSysError(_("Couldn't change the state of event object."));
+ }
+ }
+}
+
+// ----------------------------------------------------------------------------
+// wxCriticalSection implementation
+// ----------------------------------------------------------------------------
+
+class wxCriticalSectionInternal
+{
+public:
+ // init the critical section object
+ wxCriticalSectionInternal()
+ { /* ::InitializeCriticalSection(&m_data);*/ }
+
+ // implicit cast to the associated data
+ operator Handle *() { return &m_data; }
+
+ // free the associated ressources
+ ~wxCriticalSectionInternal()
+ { /* ::DeleteCriticalSection(&m_data); */}
+
+private:
+ Handle m_data;
+};
+
+wxCriticalSection::wxCriticalSection()
+{
+ m_critsect = new wxCriticalSectionInternal;
+}
+
+wxCriticalSection::~wxCriticalSection()
+{
+ delete m_critsect;
}
-class wxThreadInternal {
+void wxCriticalSection::Enter()
+{
+// ::EnterCriticalSection(*m_critsect);
+}
+
+void wxCriticalSection::Leave()
+{
+// ::LeaveCriticalSection(*m_critsect);
+}
+
+// ----------------------------------------------------------------------------
+// wxThread implementation
+// ----------------------------------------------------------------------------
+
+// wxThreadInternal class
+// ----------------------
+
+/*
+class wxThreadInternal
+{
public:
- // TODO
+ wxThreadInternal()
+ {
+ m_hThread = 0;
+ m_state = STATE_NEW;
+ m_priority = WXTHREAD_DEFAULT_PRIORITY;
+ }
+
+ // create a new (suspended) thread (for the given thread object)
+ bool Create(wxThread *thread);
+
+ // suspend/resume/terminate
+ bool Suspend();
+ bool Resume();
+ void Cancel() { m_state = STATE_CANCELED; }
+
+ // thread state
+ void SetState(wxThreadState state) { m_state = state; }
+ wxThreadState GetState() const { return m_state; }
+
+ // thread priority
+ void SetPriority(unsigned int priority) { m_priority = priority; }
+ unsigned int GetPriority() const { return m_priority; }
+
+ // thread handle and id
+ HANDLE GetHandle() const { return m_hThread; }
+ DWORD GetId() const { return m_tid; }
+
+ // thread function
+ static DWORD WinThreadStart(wxThread *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
+ ThreadId m_tid; // thread id
};
+DWORD wxThreadInternal::WinThreadStart(wxThread *thread)
+{
+ // store the thread object in the TLS
+ if ( !::TlsSetValue(s_tlsThisThread, thread) )
+ {
+ wxLogSysError(_("Can not start thread: error writing TLS."));
+
+ return (DWORD)-1;
+ }
+
+ DWORD ret = (DWORD)thread->Entry();
+ thread->p_internal->SetState(STATE_EXITED);
+ thread->OnExit();
+
+ delete thread;
+
+ return ret;
+}
+
+bool wxThreadInternal::Create(wxThread *thread)
+{
+ m_hThread = ::CreateThread
+ (
+ NULL, // default security
+ 0, // default stack size
+ (LPTHREAD_START_ROUTINE) // thread entry point
+ wxThreadInternal::WinThreadStart, //
+ (LPVOID)thread, // parameter
+ CREATE_SUSPENDED, // flags
+ &m_tid // [out] thread id
+ );
+
+ if ( m_hThread == NULL )
+ {
+ wxLogSysError(_("Can't create thread"));
+
+ return FALSE;
+ }
+
+ // translate wxWindows priority to the Windows one
+ int win_priority;
+ if (m_priority <= 20)
+ win_priority = THREAD_PRIORITY_LOWEST;
+ else if (m_priority <= 40)
+ win_priority = THREAD_PRIORITY_BELOW_NORMAL;
+ else if (m_priority <= 60)
+ win_priority = THREAD_PRIORITY_NORMAL;
+ else if (m_priority <= 80)
+ win_priority = THREAD_PRIORITY_ABOVE_NORMAL;
+ else if (m_priority <= 100)
+ win_priority = THREAD_PRIORITY_HIGHEST;
+ else
+ {
+ wxFAIL_MSG(wxT("invalid value of thread priority parameter"));
+ win_priority = THREAD_PRIORITY_NORMAL;
+ }
+
+ if ( ::SetThreadPriority(m_hThread, win_priority) == 0 )
+ {
+ wxLogSysError(_("Can't set thread priority"));
+ }
+
+ return TRUE;
+}
+
+bool wxThreadInternal::Suspend()
+{
+ DWORD nSuspendCount = ::SuspendThread(m_hThread);
+ if ( nSuspendCount == (DWORD)-1 )
+ {
+ wxLogSysError(_("Can not suspend thread %x"), m_hThread);
+
+ return FALSE;
+ }
+
+ m_state = STATE_PAUSED;
+
+ return TRUE;
+}
+
+bool wxThreadInternal::Resume()
+{
+ DWORD nSuspendCount = ::ResumeThread(m_hThread);
+ if ( nSuspendCount == (DWORD)-1 )
+ {
+ wxLogSysError(_("Can not resume thread %x"), m_hThread);
+
+ return FALSE;
+ }
+
+ m_state = STATE_RUNNING;
+
+ return TRUE;
+}
+
+// static functions
+// ----------------
+
+wxThread *wxThread::This()
+{
+ wxThread *thread = (wxThread *)::TlsGetValue(s_tlsThisThread);
+
+ // be careful, 0 may be a valid return value as well
+ if ( !thread && (::GetLastError() != NO_ERROR) )
+ {
+ wxLogSysError(_("Couldn't get the current thread pointer"));
+
+ // return NULL...
+ }
+
+ return thread;
+}
+
+bool wxThread::IsMain()
+{
+ return ::GetCurrentThreadId() == s_idMainThread;
+}
+
+#ifdef Yield
+ #undef Yield
+#endif
+
+void wxThread::Yield()
+{
+ // 0 argument to Sleep() is special
+ ::Sleep(0);
+}
+
+void wxThread::Sleep(unsigned long milliseconds)
+{
+ ::Sleep(milliseconds);
+}
+
+// create/start thread
+// -------------------
+
wxThreadError wxThread::Create()
{
- // TODO
+ if ( !p_internal->Create(this) )
+ return wxTHREAD_NO_RESOURCE;
+
return wxTHREAD_NO_ERROR;
}
-wxThreadError wxThread::Destroy()
+wxThreadError wxThread::Run()
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ wxCriticalSectionLocker lock(m_critsect);
+
+ if ( p_internal->GetState() != STATE_NEW )
+ {
+ // actually, it may be almost any state at all, not only STATE_RUNNING
+ return wxTHREAD_RUNNING;
+ }
+
+ return Resume();
}
+// suspend/resume thread
+// ---------------------
+
wxThreadError wxThread::Pause()
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ wxCriticalSectionLocker lock(m_critsect);
+
+ return p_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
}
wxThreadError wxThread::Resume()
{
- // TODO
- return wxTHREAD_NO_ERROR;
-}
+ wxCriticalSectionLocker lock(m_critsect);
-void wxThread::Exit(void *status)
-{
- // TODO
+ return p_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
}
-void wxThread::SetPriority(int prio)
+// stopping thread
+// ---------------
+
+wxThread::ExitCode wxThread::Delete()
{
- // TODO
+ ExitCode rc = 0;
+
+ // Delete() is always safe to call, so consider all possible states
+ if ( IsPaused() )
+ Resume();
+
+ if ( IsRunning() )
+ {
+ if ( IsMain() )
+ {
+ // set flag for wxIsWaitingForThread()
+ s_waitingForThread = TRUE;
+
+ wxBeginBusyCursor();
+ }
+
+ HANDLE hThread;
+ {
+ wxCriticalSectionLocker lock(m_critsect);
+
+ p_internal->Cancel();
+ hThread = p_internal->GetHandle();
+ }
+
+ // 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 (ExitCode)-1;
+
+ 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 (ExitCode)-1;
+ }
+
+ if ( IsMain() )
+ {
+ // give the thread we're waiting for chance to exit
+ // from the GUI call it might have been in
+ if ( (s_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
+ {
+ wxMutexGuiLeave();
+ }
+ }
+
+ break;
+
+ default:
+ wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
+ }
+ } while ( result != WAIT_OBJECT_0 );
+
+ if ( IsMain() )
+ {
+ s_waitingForThread = FALSE;
+
+ wxEndBusyCursor();
+ }
+
+ if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
+ {
+ wxLogLastError("GetExitCodeThread");
+
+ rc = (ExitCode)-1;
+ }
+
+ wxASSERT_MSG( (LPVOID)rc != (LPVOID)STILL_ACTIVE,
+ wxT("thread must be already terminated.") );
+
+ ::CloseHandle(hThread);
+ }
+
+ return rc;
}
-int wxThread::GetPriority() const
+wxThreadError wxThread::Kill()
{
- // TODO
- return 0;
+ if ( !IsRunning() )
+ return wxTHREAD_NOT_RUNNING;
+
+ if ( !::TerminateThread(p_internal->GetHandle(), (DWORD)-1) )
+ {
+ wxLogSysError(_("Couldn't terminate thread"));
+
+ return wxTHREAD_MISC_ERROR;
+ }
+
+ delete this;
+
+ return wxTHREAD_NO_ERROR;
}
-void wxThread::DeferDestroy(bool on)
+void wxThread::Exit(void *status)
{
- // TODO
+ delete this;
+
+ ::ExitThread((DWORD)status);
+
+ wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
}
-void wxThread::TestDestroy()
+void wxThread::SetPriority(unsigned int prio)
{
- // TODO
+ wxCriticalSectionLocker lock(m_critsect);
+
+ p_internal->SetPriority(prio);
}
-void *wxThread::Join()
+unsigned int wxThread::GetPriority() const
{
- // TODO
- return (void*) NULL;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return p_internal->GetPriority();
}
unsigned long wxThread::GetID() const
{
- // TODO
- return 0;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return (unsigned long)p_internal->GetId();
}
-/* is this needed somewhere ?
-wxThread *wxThread::GetThreadFromID(unsigned long id)
+bool wxThread::IsRunning() const
{
- // TODO
- return NULL;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return p_internal->GetState() == STATE_RUNNING;
}
-*/
bool wxThread::IsAlive() const
{
- // TODO
- return FALSE;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return (p_internal->GetState() == STATE_RUNNING) ||
+ (p_internal->GetState() == STATE_PAUSED);
}
-bool wxThread::IsRunning() const
+bool wxThread::IsPaused() const
{
- // TODO
- return FALSE;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return (p_internal->GetState() == STATE_PAUSED);
}
-bool wxThread::IsMain()
+bool wxThread::TestDestroy()
{
- // TODO
- return FALSE;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return p_internal->GetState() == STATE_CANCELED;
}
wxThread::wxThread()
{
p_internal = new wxThreadInternal();
-
- // TODO
}
wxThread::~wxThread()
{
- Destroy();
- Join();
delete p_internal;
}
-// The default callback just joins the thread and throws away the result.
-void wxThread::OnExit()
-{
- Join();
-}
+// ----------------------------------------------------------------------------
+// Automatic initialization for thread module
+// ----------------------------------------------------------------------------
-// Automatic initialization
-class wxThreadModule : public wxModule {
- DECLARE_DYNAMIC_CLASS(wxThreadModule)
+class wxThreadModule : public wxModule
+{
public:
- virtual bool OnInit() {
- /* TODO p_mainid = GetCurrentThread(); */
- wxMainMutex = new wxMutex();
- wxMainMutex->Lock();
- return TRUE;
- }
+ virtual bool OnInit();
+ virtual void OnExit();
- // Global cleanup
- virtual void OnExit() {
- wxMainMutex->Unlock();
- delete wxMainMutex;
- }
+private:
+ DECLARE_DYNAMIC_CLASS(wxThreadModule)
};
IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
+bool wxThreadModule::OnInit()
+{
+ // allocate TLS index for storing the pointer to the current thread
+ s_tlsThisThread = ::TlsAlloc();
+ if ( s_tlsThisThread == 0xFFFFFFFF )
+ {
+ // 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"));
+
+ return FALSE;
+ }
+
+ // main thread doesn't have associated wxThread object, so store 0 in the
+ // TLS instead
+ if ( !::TlsSetValue(s_tlsThisThread, (LPVOID)0) )
+ {
+ ::TlsFree(s_tlsThisThread);
+ s_tlsThisThread = 0xFFFFFFFF;
+
+ wxLogSysError(_("Thread module initialization failed: "
+ "can not store value in thread local storage"));
+
+ return FALSE;
+ }
+
+ s_critsectWaitingForGui = new wxCriticalSection();
+
+ s_critsectGui = new wxCriticalSection();
+ s_critsectGui->Enter();
+
+ // no error return for GetCurrentThreadId()
+ s_idMainThread = ::GetCurrentThreadId();
+
+ return TRUE;
+}
+
+void wxThreadModule::OnExit()
+{
+ if ( !::TlsFree(s_tlsThisThread) )
+ {
+ wxLogLastError("TlsFree failed.");
+ }
+
+ if ( s_critsectGui )
+ {
+ s_critsectGui->Leave();
+ delete s_critsectGui;
+ s_critsectGui = NULL;
+ }
+
+ wxDELETE(s_critsectWaitingForGui);
+}
+
+// ----------------------------------------------------------------------------
+// under Windows, these functions are implemented usign a critical section and
+// not a mutex, so the names are a bit confusing
+// ----------------------------------------------------------------------------
+
+void WXDLLEXPORT wxMutexGuiEnter()
+{
+ // this would dead lock everything...
+ wxASSERT_MSG( !wxThread::IsMain(),
+ wxT("main thread doesn't want to block in wxMutexGuiEnter()!") );
+
+ // the order in which we enter the critical sections here is crucial!!
+
+ // set the flag telling to the main thread that we want to do some GUI
+ {
+ wxCriticalSectionLocker enter(*s_critsectWaitingForGui);
+
+ s_nWaitingForGui++;
+ }
+
+ wxWakeUpMainThread();
+
+ // now we may block here because the main thread will soon let us in
+ // (during the next iteration of OnIdle())
+ s_critsectGui->Enter();
+}
+
+void WXDLLEXPORT wxMutexGuiLeave()
+{
+ wxCriticalSectionLocker enter(*s_critsectWaitingForGui);
+
+ if ( wxThread::IsMain() )
+ {
+ s_bGuiOwnedByMainThread = FALSE;
+ }
+ else
+ {
+ // decrement the number of waiters now
+ wxASSERT_MSG( s_nWaitingForGui > 0,
+ wxT("calling wxMutexGuiLeave() without entering it first?") );
+
+ s_nWaitingForGui--;
+
+ wxWakeUpMainThread();
+ }
+
+ s_critsectGui->Leave();
+}
+
+void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+{
+ wxASSERT_MSG( wxThread::IsMain(),
+ wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
+
+ wxCriticalSectionLocker enter(*s_critsectWaitingForGui);
+
+ if ( s_nWaitingForGui == 0 )
+ {
+ // no threads are waiting for GUI - so we may acquire the lock without
+ // any danger (but only if we don't already have it)
+ if ( !wxGuiOwnedByMainThread() )
+ {
+ s_critsectGui->Enter();
+
+ s_bGuiOwnedByMainThread = TRUE;
+ }
+ //else: already have it, nothing to do
+ }
+ else
+ {
+ // some threads are waiting, release the GUI lock if we have it
+ if ( wxGuiOwnedByMainThread() )
+ {
+ wxMutexGuiLeave();
+ }
+ //else: some other worker thread is doing GUI
+ }
+}
+
+bool WXDLLEXPORT wxGuiOwnedByMainThread()
+{
+ return s_bGuiOwnedByMainThread;
+}
+
+// wake up the main thread if it's in ::GetMessage()
+void WXDLLEXPORT wxWakeUpMainThread()
+{
+ // sending any message would do - hopefully WM_NULL is harmless enough
+ if ( !::PostThreadMessage(s_idMainThread, WM_NULL, 0, 0) )
+ {
+ // should never happen
+ wxLogLastError("PostThreadMessage(WM_NULL)");
+ }
+}
+
+bool WXDLLEXPORT wxIsWaitingForThread()
+{
+ return s_waitingForThread;
+}
+*/
+
+#endif // wxUSE_THREADS
projects / wxWidgets.git / blobdiff