// Name: thread.cpp
// Purpose: wxThread Implementation. For Unix ports, see e.g. src/gtk
// Author: Original from Wolfram Gloger/Guilhem Lavaux
-// Modified by:
+// Modified by: David Webster
// Created: 04/22/98
// RCS-ID: $Id$
// Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998)
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "thread.h"
-#endif
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#if wxUSE_THREADS
+
+#include <stdio.h>
#include "wx/module.h"
-#include "wx/thread.h"
+#include "wx/intl.h"
#include "wx/utils.h"
+#include "wx/log.h"
+#include "wx/thread.h"
-#if wxUSE_THREADS
+#define INCL_DOSSEMAPHORES
+#define INCL_DOSPROCESS
+#define INCL_ERRORS
+#include <os2.h>
+#include <bseerr.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
+// id of the main thread - the one which can call GUI functions without first
+// calling wxMutexGuiEnter()
+static ULONG s_ulIdMainThread = 0;
+wxMutex* p_wxMainMutex;
-/////////////////////////////////////////////////////////////////////////////
-// Windows implementation
-/////////////////////////////////////////////////////////////////////////////
+// OS2 substitute for Tls pointer the current parent thread object
+wxThread* m_pThread; // pointer to the wxWindows thread object
+
+// 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
+// any GUI calls
+static wxCriticalSection *gs_pCritsectGui = NULL;
-class wxMutexInternal {
+// critical section which protects s_nWaitingForGui variable
+static wxCriticalSection *gs_pCritsectWaitingForGui = 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_bWaitingForThread = FALSE;
+
+// ============================================================================
+// OS/2 implementation of thread classes
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxMutex implementation
+// ----------------------------------------------------------------------------
+class wxMutexInternal
+{
public:
- // TODO: internal mutex handle
+ HMTX m_vMutex;
};
wxMutex::wxMutex()
{
- p_internal = new wxMutexInternal;
- // TODO: create internal mutext handle
+ APIRET ulrc;
+
+ m_internal = new wxMutexInternal;
+ ulrc = ::DosCreateMutexSem(NULL, &m_internal->m_vMutex, 0L, FALSE);
+ if (ulrc != 0)
+ {
+ 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);
+ ::DosCloseMutexSem(m_internal->m_vMutex);
+ m_internal->m_vMutex = NULL;
}
wxMutexError wxMutex::Lock()
{
- // TODO
+ APIRET ulrc;
+
+ ulrc = ::DosRequestMutexSem(m_internal->m_vMutex, SEM_INDEFINITE_WAIT);
+
+ switch (ulrc)
+ {
+ case ERROR_TOO_MANY_SEM_REQUESTS:
+ return wxMUTEX_BUSY;
+
+ case NO_ERROR:
+ // ok
+ break;
+
+ case ERROR_INVALID_HANDLE:
+ case ERROR_INTERRUPT:
+ case ERROR_SEM_OWNER_DIED:
+ wxLogSysError(_("Couldn't acquire a mutex lock"));
+ return wxMUTEX_MISC_ERROR;
+
+ case ERROR_TIMEOUT:
+ default:
+ wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
+ }
m_locked++;
return wxMUTEX_NO_ERROR;
}
wxMutexError wxMutex::TryLock()
{
- // TODO
+ ULONG ulrc;
+
+ ulrc = ::DosRequestMutexSem(m_internal->m_vMutex, SEM_IMMEDIATE_RETURN /*0L*/);
+ if (ulrc == ERROR_TIMEOUT || ulrc == ERROR_TOO_MANY_SEM_REQUESTS)
+ return wxMUTEX_BUSY;
+
m_locked++;
return wxMUTEX_NO_ERROR;
}
wxMutexError wxMutex::Unlock()
{
+ APIRET ulrc;
+
if (m_locked > 0)
m_locked--;
- // TODO
+ ulrc = ::DosReleaseMutexSem(m_internal->m_vMutex);
+ if (ulrc != 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;
+ inline wxConditionInternal (wxMutex& rMutex) : m_vMutex(rMutex)
+ {
+ ::DosCreateEventSem(NULL, &m_vEvent, DC_SEM_SHARED, FALSE);
+ if (!m_vEvent)
+ {
+ wxLogSysError(_("Can not create event semaphore."));
+ }
+ m_nWaiters = 0;
+ }
+
+ inline bool Wait(
+ unsigned long ulTimeout
+ )
+ {
+ APIRET ulrc;
+
+ m_nWaiters++;
+ ulrc = ::DosWaitEventSem(m_vEvent, ulTimeout);
+ m_nWaiters--;
+ return (ulrc != ERROR_TIMEOUT);
+ }
+
+ inline ~wxConditionInternal ()
+ {
+ APIRET ulrc;
+
+ if (m_vEvent)
+ {
+ ulrc = ::DosCloseEventSem(m_vEvent);
+ if (!ulrc)
+ {
+ wxLogLastError("DosCloseEventSem(m_vEvent)");
+ }
+ }
+ }
+
+ HEV m_vEvent;
+ int m_nWaiters;
+ wxMutex& m_vMutex;
};
-wxCondition::wxCondition()
+wxCondition::wxCondition(wxMutex& rMutex)
{
- p_internal = new wxConditionInternal;
- // TODO: create internal handle
- p_internal->waiters = 0;
+ APIRET ulrc;
+ ULONG ulCount;
+
+ m_internal = new wxConditionInternal(rMutex);
+ ulrc = ::DosCreateEventSem(NULL, &m_internal->m_vEvent, 0L, FALSE);
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Can not create event object."));
+ }
+ m_internal->m_nWaiters = 0;
+ // ?? just for good measure?
+ ::DosResetEventSem(m_internal->m_vEvent, &ulCount);
}
wxCondition::~wxCondition()
{
- // TODO: destroy internal handle
+ ::DosCloseEventSem(m_internal->m_vEvent);
+ delete m_internal;
+ m_internal = NULL;
}
-void wxCondition::Wait(wxMutex& mutex)
+void wxCondition::Wait()
{
- mutex.Unlock();
- p_internal->waiters++;
- // TODO wait here
- p_internal->waiters--;
- mutex.Lock();
+ (void)m_internal->Wait(SEM_INDEFINITE_WAIT);
}
-bool wxCondition::Wait(wxMutex& mutex, unsigned long sec,
- unsigned long nsec)
+bool wxCondition::Wait(
+ unsigned long lMilliSec
+)
{
- mutex.Unlock();
- p_internal->waiters++;
-
- // TODO wait here
- p_internal->waiters--;
- mutex.Lock();
-
- return FALSE;
+ return m_internal->Wait(lMilliSec);
}
void wxCondition::Signal()
{
- // TODO
+ ::DosPostEventSem(m_internal->m_vEvent);
}
void wxCondition::Broadcast()
{
- // TODO
+ int i;
+
+ for (i = 0; i < m_internal->m_nWaiters; i++)
+ {
+ if (::DosPostEventSem(m_internal->m_vEvent) != 0)
+ {
+ wxLogSysError(_("Couldn't change the state of event object."));
+ }
+ }
+}
+
+// ----------------------------------------------------------------------------
+// wxCriticalSection implementation
+// ----------------------------------------------------------------------------
+
+wxCriticalSection::wxCriticalSection()
+{
+}
+
+wxCriticalSection::~wxCriticalSection()
+{
}
-class wxThreadInternal {
+void wxCriticalSection::Enter()
+{
+ ::DosEnterCritSec();
+}
+
+void wxCriticalSection::Leave()
+{
+ ::DosExitCritSec();
+}
+
+// ----------------------------------------------------------------------------
+// wxThread implementation
+// ----------------------------------------------------------------------------
+
+// wxThreadInternal class
+// ----------------------
+
+class wxThreadInternal
+{
public:
- // TODO
+ inline wxThreadInternal()
+ {
+ m_hThread = 0;
+ m_eState = STATE_NEW;
+ m_nPriority = 0;
+ }
+
+ ~wxThreadInternal()
+ {
+ Free();
+ }
+
+ void Free()
+ {
+ if (m_hThread)
+ {
+ ::DosExit(0,0);
+ m_hThread = 0;
+ }
+ }
+
+ // create a new (suspended) thread (for the given thread object)
+ bool Create( wxThread* pThread
+ ,unsigned int uStackSize
+ );
+
+ // suspend/resume/terminate
+ bool Suspend();
+ bool Resume();
+ inline void Cancel() { m_eState = STATE_CANCELED; }
+
+ // thread state
+ inline void SetState(wxThreadState eState) { m_eState = eState; }
+ inline wxThreadState GetState() const { return m_eState; }
+
+ // thread priority
+ void SetPriority(unsigned int nPriority);
+ inline unsigned int GetPriority() const { return m_nPriority; }
+
+ // thread handle and id
+ inline TID GetHandle() const { return m_hThread; }
+ TID GetId() const { return m_hThread; }
+
+ // thread function
+ static DWORD OS2ThreadStart(wxThread *thread);
+
+private:
+ // Threads in OS/2 have only an ID, so m_hThread is both it's handle and ID
+ // PM also has no real Tls mechanism to index pointers by so we'll just
+ // keep track of the wxWindows parent object here.
+ TID m_hThread; // handle and ID of the thread
+ wxThreadState m_eState; // state, see wxThreadState enum
+ unsigned int m_nPriority; // thread priority in "wx" units
};
-wxThreadError wxThread::Create()
+ULONG wxThreadInternal::OS2ThreadStart(
+ wxThread* pThread
+)
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ m_pThread = pThread;
+
+ DWORD dwRet = (DWORD)pThread->Entry();
+
+ // enter m_critsect before changing the thread state
+ pThread->m_critsect.Enter();
+
+ bool bWasCancelled = pThread->m_internal->GetState() == STATE_CANCELED;
+
+ pThread->m_internal->SetState(STATE_EXITED);
+ pThread->m_critsect.Leave();
+
+ pThread->OnExit();
+
+ // if the thread was cancelled (from Delete()), then it the handle is still
+ // needed there
+ if (pThread->IsDetached() && !bWasCancelled)
+ {
+ // auto delete
+ delete pThread;
+ }
+ //else: the joinable threads handle will be closed when Wait() is done
+ return dwRet;
}
-wxThreadError wxThread::Destroy()
+void wxThreadInternal::SetPriority(
+ unsigned int nPriority
+)
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ // translate wxWindows priority to the PM one
+ ULONG ulOS2_Priority;
+ ULONG ulrc;
+
+ m_nPriority = nPriority;
+
+ if (m_nPriority <= 20)
+ ulOS2_Priority = PRTYC_NOCHANGE;
+ else if (m_nPriority <= 40)
+ ulOS2_Priority = PRTYC_IDLETIME;
+ else if (m_nPriority <= 60)
+ ulOS2_Priority = PRTYC_REGULAR;
+ else if (m_nPriority <= 80)
+ ulOS2_Priority = PRTYC_TIMECRITICAL;
+ else if (m_nPriority <= 100)
+ ulOS2_Priority = PRTYC_FOREGROUNDSERVER;
+ else
+ {
+ wxFAIL_MSG(wxT("invalid value of thread priority parameter"));
+ ulOS2_Priority = PRTYC_REGULAR;
+ }
+ ulrc = ::DosSetPriority( PRTYS_THREAD
+ ,ulOS2_Priority
+ ,0
+ ,(ULONG)m_hThread
+ );
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Can't set thread priority"));
+ }
}
-wxThreadError wxThread::Pause()
+bool wxThreadInternal::Create(
+ wxThread* pThread
+, unsigned int uStackSize
+)
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ APIRET ulrc;
+
+ ulrc = ::DosCreateThread( &m_hThread
+ ,(PFNTHREAD)wxThreadInternal::OS2ThreadStart
+ ,(ULONG)pThread
+ ,CREATE_SUSPENDED | STACK_SPARSE
+ ,(ULONG)uStackSize
+ );
+ if(ulrc != 0)
+ {
+ wxLogSysError(_("Can't create thread"));
+
+ return FALSE;
+ }
+ if (m_nPriority != WXTHREAD_DEFAULT_PRIORITY)
+ {
+ SetPriority(m_nPriority);
+ }
+ return(TRUE);
}
-wxThreadError wxThread::Resume()
+bool wxThreadInternal::Suspend()
{
- // TODO
+ ULONG ulrc = ::DosSuspendThread(m_hThread);
+
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Can not suspend thread %lu"), m_hThread);
+ return FALSE;
+ }
+ m_eState = STATE_PAUSED;
+ return TRUE;
+}
+
+bool wxThreadInternal::Resume()
+{
+ ULONG ulrc = ::DosResumeThread(m_hThread);
+
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Can not suspend thread %lu"), m_hThread);
+ return FALSE;
+ }
+ m_eState = STATE_PAUSED;
+ return TRUE;
+}
+
+// static functions
+// ----------------
+
+wxThread *wxThread::This()
+{
+ wxThread* pThread = m_pThread;
+ return pThread;
+}
+
+bool wxThread::IsMain()
+{
+ PTIB ptib;
+ PPIB ppib;
+
+ ::DosGetInfoBlocks(&ptib, &ppib);
+
+ if (ptib->tib_ptib2->tib2_ultid == s_ulIdMainThread)
+ return TRUE;
+ return FALSE;
+}
+
+#ifdef Yield
+ #undef Yield
+#endif
+
+void wxThread::Yield()
+{
+ ::DosSleep(0);
+}
+
+void wxThread::Sleep(
+ unsigned long ulMilliseconds
+)
+{
+ ::DosSleep(ulMilliseconds);
+}
+
+// ctor and dtor
+// -------------
+
+wxThread::wxThread(wxThreadKind kind)
+{
+ m_internal = new wxThreadInternal();
+
+ m_isDetached = kind == wxTHREAD_DETACHED;
+}
+
+wxThread::~wxThread()
+{
+ delete m_internal;
+}
+
+// create/start thread
+// -------------------
+
+wxThreadError wxThread::Create(
+ unsigned int uStackSize
+)
+{
+ if ( !m_internal->Create(this, uStackSize) )
+ return wxTHREAD_NO_RESOURCE;
+
return wxTHREAD_NO_ERROR;
}
-void wxThread::Exit(void *status)
+wxThreadError wxThread::Run()
{
- // TODO
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ if ( m_internal->GetState() != STATE_NEW )
+ {
+ // actually, it may be almost any state at all, not only STATE_RUNNING
+ return wxTHREAD_RUNNING;
+ }
+ return Resume();
}
-void wxThread::SetPriority(int prio)
+// suspend/resume thread
+// ---------------------
+
+wxThreadError wxThread::Pause()
{
- // TODO
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
}
-int wxThread::GetPriority() const
+wxThreadError wxThread::Resume()
{
- // TODO
- return 0;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
}
-void wxThread::DeferDestroy(bool on)
+// stopping thread
+// ---------------
+
+wxThread::ExitCode wxThread::Wait()
{
- // TODO
+ // 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") );
+ ExitCode rc = (ExitCode)-1;
+ (void)Delete(&rc);
+ m_internal->Free();
+ return(rc);
}
-void wxThread::TestDestroy()
+wxThreadError wxThread::Delete(ExitCode *pRc)
{
- // TODO
+ ExitCode rc = 0;
+
+ // Delete() is always safe to call, so consider all possible states
+ if (IsPaused())
+ Resume();
+
+ TID hThread = m_internal->GetHandle();
+
+ if (IsRunning())
+ {
+ if (IsMain())
+ {
+ // set flag for wxIsWaitingForThread()
+ gs_bWaitingForThread = TRUE;
+
+#if wxUSE_GUI
+ wxBeginBusyCursor();
+#endif // wxUSE_GUI
+ }
+
+ // ask the thread to terminate
+ {
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->Cancel();
+ }
+
+#if wxUSE_GUI
+ // need a way to finish GUI processing before killing the thread
+ // until then we just exit
+
+ if ((gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread())
+ {
+ wxMutexGuiLeave();
+ }
+#else // !wxUSE_GUI
+
+ // can't wait for yourself to end under OS/2 so just quit
+
+#endif // wxUSE_GUI/!wxUSE_GUI
+
+ if ( IsMain() )
+ {
+ gs_bWaitingForThread = FALSE;
+
+#if wxUSE_GUI
+ wxEndBusyCursor();
+#endif // wxUSE_GUI
+ }
+ }
+
+ ::DosExit(0, 0);
+ // probably won't get this far, but
+ if (IsDetached())
+ {
+ delete this;
+ }
+
+ if ( pRc )
+ *pRc = rc;
+
+ return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
}
-void *wxThread::Join()
+wxThreadError wxThread::Kill()
{
- // TODO
- return (void*) NULL;
+ if (!IsRunning())
+ return wxTHREAD_NOT_RUNNING;
+
+ ::DosKillThread(m_internal->GetHandle());
+ m_internal->Free();
+ if (IsDetached())
+ {
+ delete this;
+ }
+ return wxTHREAD_NO_ERROR;
}
-unsigned long wxThread::GetID() const
+void wxThread::Exit(
+ ExitCode pStatus
+)
{
- // TODO
- return 0;
+ m_internal->Free();
+ delete this;
+ ::DosExit(EXIT_THREAD, ULONG(pStatus));
+ wxFAIL_MSG(wxT("Couldn't return from DosExit()!"));
}
-/*
-wxThread *wxThread::GetThreadFromID(unsigned long id)
+void wxThread::SetPriority(
+ unsigned int nPrio
+)
{
- // TODO
- return NULL;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ m_internal->SetPriority(nPrio);
}
-*/
-bool wxThread::IsAlive() const
+unsigned int wxThread::GetPriority() const
{
- // TODO
- return FALSE;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return m_internal->GetPriority();
}
-bool wxThread::IsRunning() const
+unsigned long wxThread::GetId() const
{
- // TODO
- return FALSE;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+ return (unsigned long)m_internal->GetId();
}
-bool wxThread::IsMain()
+bool wxThread::IsRunning() const
{
- // TODO
- return FALSE;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return(m_internal->GetState() == STATE_RUNNING);
}
-wxThread::wxThread()
+bool wxThread::IsAlive() const
{
- p_internal = new wxThreadInternal();
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
- // TODO
+ return (m_internal->GetState() == STATE_RUNNING) ||
+ (m_internal->GetState() == STATE_PAUSED);
}
-wxThread::~wxThread()
+bool wxThread::IsPaused() const
{
- Destroy();
- Join();
- delete p_internal;
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return (m_internal->GetState() == STATE_PAUSED);
}
-// The default callback just joins the thread and throws away the result.
-void wxThread::OnExit()
+bool wxThread::TestDestroy()
{
- Join();
+ wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+ return m_internal->GetState() == STATE_CANCELED;
}
-// Automatic initialization
-class wxThreadModule : public wxModule {
- DECLARE_DYNAMIC_CLASS(wxThreadModule)
+// ----------------------------------------------------------------------------
+// Automatic initialization for thread module
+// ----------------------------------------------------------------------------
+
+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()
+{
+ gs_pCritsectWaitingForGui = new wxCriticalSection();
+
+ gs_pCritsectGui = new wxCriticalSection();
+ gs_pCritsectGui->Enter();
+
+ PTIB ptib;
+ PPIB ppib;
+
+ ::DosGetInfoBlocks(&ptib, &ppib);
+
+ s_ulIdMainThread = ptib->tib_ptib2->tib2_ultid;
+ return TRUE;
+}
+
+void wxThreadModule::OnExit()
+{
+ if (gs_pCritsectGui)
+ {
+ gs_pCritsectGui->Leave();
+#if (!(defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )))
+ delete gs_pCritsectGui;
+#endif
+ gs_pCritsectGui = NULL;
+ }
+
+#if (!(defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )))
+ wxDELETE(gs_pCritsectWaitingForGui);
+#endif
+}
+
+// ----------------------------------------------------------------------------
+// Helper functions
+// ----------------------------------------------------------------------------
+
+// Does nothing under OS/2 [for now]
+void WXDLLEXPORT wxWakeUpMainThread()
+{
+}
+
+void WXDLLEXPORT wxMutexGuiLeave()
+{
+ wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui);
+
+ if ( wxThread::IsMain() )
+ {
+ gs_bGuiOwnedByMainThread = FALSE;
+ }
+ else
+ {
+ // decrement the number of waiters now
+ wxASSERT_MSG(gs_nWaitingForGui > 0,
+ wxT("calling wxMutexGuiLeave() without entering it first?") );
+
+ gs_nWaitingForGui--;
+
+ wxWakeUpMainThread();
+ }
+
+ gs_pCritsectGui->Leave();
+}
+
+void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+{
+ wxASSERT_MSG( wxThread::IsMain(),
+ wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
+
+ wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui);
+
+ if (gs_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())
+ {
+ gs_pCritsectGui->Enter();
+
+ gs_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 gs_bGuiOwnedByMainThread;
+}
+
+bool WXDLLEXPORT wxIsWaitingForThread()
+{
+ return gs_bWaitingForThread;
+}
+
#endif
// wxUSE_THREADS
projects / wxWidgets.git / blobdiff