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thread.cpp
1057 lines (872 loc) · 27.9 KB
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thread.cpp
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/////////////////////////////////////////////////////////////////////////////
// Name: src/os2/thread.cpp
// Purpose: wxThread Implementation
// Author: Original from Wolfram Gloger/Guilhem Lavaux/David Webster
// Modified by: Stefan Neis
// Created: 04/22/98
// RCS-ID: $Id$
// Copyright: (c) Stefan Neis (2003)
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#if wxUSE_THREADS
#include "wx/thread.h"
#ifndef WX_PRECOMP
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/app.h"
#include "wx/module.h"
#endif //WX_PRECOMP
#include "wx/apptrait.h"
#include "wx/utils.h"
#include <stdio.h>
#define INCL_DOSSEMAPHORES
#define INCL_DOSPROCESS
#define INCL_DOSMISC
#define INCL_ERRORS
#include <os2.h>
#ifndef __EMX__
#include <bseerr.h>
#endif
// 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
};
// ----------------------------------------------------------------------------
// this module's globals
// ----------------------------------------------------------------------------
// id of the main thread - the one which can call GUI functions without first
// calling wxMutexGuiEnter()
wxThreadIdType wxThread::ms_idMainThread = 0;
wxMutex* p_wxMainMutex;
// OS2 substitute for Tls pointer the current parent thread object
wxThread* m_pThread; // pointer to the wxWidgets 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;
// 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 and related classes
// ============================================================================
// ----------------------------------------------------------------------------
// wxMutex implementation
// ----------------------------------------------------------------------------
class wxMutexInternal
{
public:
wxMutexInternal(wxMutexType mutexType);
~wxMutexInternal();
bool IsOk() const { return m_vMutex != NULL; }
wxMutexError Lock() { return LockTimeout(SEM_INDEFINITE_WAIT); }
wxMutexError Lock(unsigned long ms) { return LockTimeout(ms); }
wxMutexError TryLock();
wxMutexError Unlock();
private:
wxMutexError LockTimeout(ULONG ulMilliseconds);
HMTX m_vMutex;
};
// all mutexes are "pseudo-"recursive under OS2 so we don't use mutexType
// (Calls to DosRequestMutexSem and DosReleaseMutexSem can be nested, but
// the request count for a semaphore cannot exceed 65535. If an attempt is
// made to exceed this number, ERROR_TOO_MANY_SEM_REQUESTS is returned.)
wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(eMutexType))
{
APIRET ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE);
if (ulrc != 0)
{
wxLogSysError(_("Cannot create mutex."));
m_vMutex = NULL;
}
}
wxMutexInternal::~wxMutexInternal()
{
if (m_vMutex)
{
if (::DosCloseMutexSem(m_vMutex))
{
wxLogLastError(wxT("DosCloseMutexSem(mutex)"));
}
}
}
wxMutexError wxMutexInternal::TryLock()
{
const wxMutexError rc = LockTimeout( SEM_IMMEDIATE_RETURN );
// we have a special return code for timeout in this case
return rc == wxMUTEX_TIMEOUT ? wxMUTEX_BUSY : rc;
}
wxMutexError wxMutexInternal::LockTimeout(ULONG ulMilliseconds)
{
APIRET ulrc;
ulrc = ::DosRequestMutexSem(m_vMutex, ulMilliseconds);
switch (ulrc)
{
case ERROR_TIMEOUT:
return wxMUTEX_TIMEOUT;
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;
default:
wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
return wxMUTEX_MISC_ERROR;
}
return wxMUTEX_NO_ERROR;
}
wxMutexError wxMutexInternal::Unlock()
{
APIRET ulrc;
ulrc = ::DosReleaseMutexSem(m_vMutex);
if (ulrc != 0)
{
wxLogSysError(_("Couldn't release a mutex"));
return wxMUTEX_MISC_ERROR;
}
return wxMUTEX_NO_ERROR;
}
// --------------------------------------------------------------------------
// wxSemaphore
// --------------------------------------------------------------------------
// a trivial wrapper around OS2 event semaphore
class wxSemaphoreInternal
{
public:
wxSemaphoreInternal(int initialcount, int maxcount);
~wxSemaphoreInternal();
bool IsOk() const { return m_vEvent != NULL; }
wxSemaError Wait() { return WaitTimeout(SEM_INDEFINITE_WAIT); }
wxSemaError TryWait() { return WaitTimeout(SEM_IMMEDIATE_RETURN); }
wxSemaError WaitTimeout(unsigned long milliseconds);
wxSemaError Post();
private:
HEV m_vEvent;
HMTX m_vMutex;
int m_count;
int m_maxcount;
};
wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
{
APIRET ulrc;
if ( maxcount == 0 )
{
// make it practically infinite
maxcount = INT_MAX;
}
m_count = initialcount;
m_maxcount = maxcount;
ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE);
if (ulrc != 0)
{
wxLogLastError(wxT("DosCreateMutexSem()"));
m_vMutex = NULL;
m_vEvent = NULL;
return;
}
ulrc = ::DosCreateEventSem(NULL, &m_vEvent, 0L, FALSE);
if ( ulrc != 0)
{
wxLogLastError(wxT("DosCreateEventSem()"));
::DosCloseMutexSem(m_vMutex);
m_vMutex = NULL;
m_vEvent = NULL;
}
if (initialcount)
::DosPostEventSem(m_vEvent);
}
wxSemaphoreInternal::~wxSemaphoreInternal()
{
if ( m_vEvent )
{
if ( ::DosCloseEventSem(m_vEvent) )
{
wxLogLastError(wxT("DosCloseEventSem(semaphore)"));
}
if ( ::DosCloseMutexSem(m_vMutex) )
{
wxLogLastError(wxT("DosCloseMutexSem(semaphore)"));
}
else
m_vEvent = NULL;
}
}
wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long ulMilliseconds)
{
APIRET ulrc;
do {
ulrc = ::DosWaitEventSem(m_vEvent, ulMilliseconds );
switch ( ulrc )
{
case NO_ERROR:
break;
case ERROR_TIMEOUT:
if (ulMilliseconds == SEM_IMMEDIATE_RETURN)
return wxSEMA_BUSY;
else
return wxSEMA_TIMEOUT;
default:
wxLogLastError(wxT("DosWaitEventSem(semaphore)"));
return wxSEMA_MISC_ERROR;
}
ulrc = :: DosRequestMutexSem(m_vMutex, ulMilliseconds);
switch ( ulrc )
{
case NO_ERROR:
// ok
break;
case ERROR_TIMEOUT:
case ERROR_TOO_MANY_SEM_REQUESTS:
if (ulMilliseconds == SEM_IMMEDIATE_RETURN)
return wxSEMA_BUSY;
else
return wxSEMA_TIMEOUT;
default:
wxFAIL_MSG(wxT("DosRequestMutexSem(mutex)"));
return wxSEMA_MISC_ERROR;
}
bool OK = false;
if (m_count > 0)
{
m_count--;
OK = true;
}
else
{
ULONG ulPostCount;
::DosResetEventSem(m_vEvent, &ulPostCount);
}
::DosReleaseMutexSem(m_vMutex);
if (OK)
return wxSEMA_NO_ERROR;
} while (ulMilliseconds == SEM_INDEFINITE_WAIT);
if (ulMilliseconds == SEM_IMMEDIATE_RETURN)
return wxSEMA_BUSY;
return wxSEMA_TIMEOUT;
}
wxSemaError wxSemaphoreInternal::Post()
{
APIRET ulrc;
ulrc = ::DosRequestMutexSem(m_vMutex, SEM_INDEFINITE_WAIT);
if (ulrc != NO_ERROR)
return wxSEMA_MISC_ERROR;
bool OK = false;
if (m_count < m_maxcount)
{
m_count++;
ulrc = ::DosPostEventSem(m_vEvent);
OK = true;
}
::DosReleaseMutexSem(m_vMutex);
if (!OK)
return wxSEMA_OVERFLOW;
if ( ulrc != NO_ERROR && ulrc != ERROR_ALREADY_POSTED )
{
wxLogLastError(wxT("DosPostEventSem(semaphore)"));
return wxSEMA_MISC_ERROR;
}
return wxSEMA_NO_ERROR;
}
// ----------------------------------------------------------------------------
// wxThread implementation
// ----------------------------------------------------------------------------
// wxThreadInternal class
// ----------------------
class wxThreadInternal
{
public:
inline wxThreadInternal()
{
m_hThread = 0;
m_eState = STATE_NEW;
m_nPriority = WXTHREAD_DEFAULT_PRIORITY;
}
~wxThreadInternal()
{
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 void OS2ThreadStart(void* pParam);
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 wxWidgets 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
};
void wxThreadInternal::OS2ThreadStart( void * pParam )
{
DWORD dwRet;
bool bWasCancelled;
wxThread *pThread = (wxThread *)pParam;
// first of all, wait for the thread to be started.
pThread->m_critsect.Enter();
pThread->m_critsect.Leave();
// Now check whether we hadn't been cancelled already and don't
// start the user code at all in this case.
if ( pThread->m_internal->GetState() == STATE_EXITED )
{
dwRet = (DWORD)-1;
bWasCancelled = true;
}
else // do run thread
{
wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
unsigned long ulHab;
if (traits)
traits->InitializeGui(ulHab);
dwRet = (DWORD)pThread->Entry();
if (traits)
traits->TerminateGui(ulHab);
// enter m_critsect before changing the thread state
pThread->m_critsect.Enter();
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;
}
void wxThreadInternal::SetPriority(
unsigned int nPriority
)
{
// translate wxWidgets priority to the PM one
ULONG ulOS2_PriorityClass;
ULONG ulOS2_SubPriority;
ULONG ulrc;
m_nPriority = nPriority;
if (m_nPriority <= 25)
ulOS2_PriorityClass = PRTYC_IDLETIME;
else if (m_nPriority <= 50)
ulOS2_PriorityClass = PRTYC_REGULAR;
else if (m_nPriority <= 75)
ulOS2_PriorityClass = PRTYC_TIMECRITICAL;
else if (m_nPriority <= 100)
ulOS2_PriorityClass = PRTYC_FOREGROUNDSERVER;
else
{
wxFAIL_MSG(wxT("invalid value of thread priority parameter"));
ulOS2_PriorityClass = PRTYC_REGULAR;
}
ulOS2_SubPriority = (ULONG) (((m_nPriority - 1) % 25 + 1) * 31.0 / 25);
ulrc = ::DosSetPriority( PRTYS_THREAD
,ulOS2_PriorityClass
,ulOS2_SubPriority
,(ULONG)m_hThread
);
if (ulrc != 0)
{
wxLogSysError(_("Can't set thread priority"));
}
}
bool wxThreadInternal::Create( wxThread* pThread,
unsigned int uStackSize)
{
int tid;
if (!uStackSize)
uStackSize = 131072;
pThread->m_critsect.Enter();
tid = _beginthread(wxThreadInternal::OS2ThreadStart,
NULL, uStackSize, pThread);
if(tid == -1)
{
wxLogSysError(_("Can't create thread"));
return false;
}
m_hThread = tid;
if (m_nPriority != WXTHREAD_DEFAULT_PRIORITY)
{
SetPriority(m_nPriority);
}
return true;
}
bool wxThreadInternal::Suspend()
{
ULONG ulrc = ::DosSuspendThread(m_hThread);
if (ulrc != 0)
{
wxLogSysError(_("Cannot 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(_("Cannot resume thread %lu"), m_hThread);
return false;
}
// 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_eState != STATE_EXITED )
{
m_eState = STATE_RUNNING;
}
return true;
}
// static functions
// ----------------
wxThread *wxThread::This()
{
wxThread* pThread = m_pThread;
return pThread;
}
#ifdef Yield
#undef Yield
#endif
void wxThread::Yield()
{
::DosSleep(0);
}
int wxThread::GetCPUCount()
{
ULONG CPUCount;
APIRET ulrc;
ulrc = ::DosQuerySysInfo(26, 26, (void *)&CPUCount, sizeof(ULONG));
// QSV_NUMPROCESSORS(26) is typically not defined in header files
if (ulrc != 0)
CPUCount = 1;
return CPUCount;
}
wxThreadIdType wxThread::GetCurrentId()
{
PTIB ptib;
PPIB ppib;
::DosGetInfoBlocks(&ptib, &ppib);
return (wxThreadIdType) ptib->tib_ptib2->tib2_ultid;
}
bool wxThread::SetConcurrency(size_t level)
{
wxASSERT_MSG( IsMain(), wxT("should only be called from the main thread") );
// ok only for the default one
if ( level == 0 )
return 0;
// Don't know how to realize this on OS/2.
return level == 1;
}
// 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
)
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
if ( !m_internal->Create(this, uStackSize) )
return wxTHREAD_NO_RESOURCE;
return wxTHREAD_NO_ERROR;
}
wxThreadError wxThread::Run()
{
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();
}
// suspend/resume thread
// ---------------------
wxThreadError wxThread::Pause()
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
}
wxThreadError wxThread::Resume()
{
if (m_internal->GetState() == STATE_NEW)
{
m_internal->SetState(STATE_RUNNING);
m_critsect.Leave();
return wxTHREAD_NO_ERROR;
}
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
}
// stopping thread
// ---------------
wxThread::ExitCode wxThread::Wait(wxThreadWait waitMode)
{
// 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,
wxT("can't wait for detached thread") );
ExitCode rc = (ExitCode)-1;
(void)Delete(&rc, waitMode);
return(rc);
}
wxThreadError wxThread::Delete(ExitCode *pRc, wxThreadWait WXUNUSED(waitMode))
{
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((wxCriticalSection &)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();
TID hThread = m_internal->GetHandle();
if ( isRunning || IsRunning())
{
if (IsMain())
{
// set flag for wxIsWaitingForThread()
gs_bWaitingForThread = true;
}
// ask the thread to terminate
if ( shouldCancel )
{
wxCriticalSectionLocker lock(m_critsect);
m_internal->Cancel();
}
#if 0
// 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 = 0; // suppress warnings from broken compilers
do
{
if ( 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 = ::DosWaitThread(&hThread, DCWW_NOWAIT);
// FIXME: We ought to have a message processing loop here!!
switch ( result )
{
case ERROR_INTERRUPT:
case ERROR_THREAD_NOT_TERMINATED:
break;
case ERROR_INVALID_THREADID:
case NO_ERROR:
// thread we're waiting for just terminated
// or even does not exist any more.
result = NO_ERROR;
break;
default:
wxFAIL_MSG(wxT("unexpected result of DosWaitThread"));
}
if ( IsMain() )
{
// event processing - needed if we are the main thread
// to give other threads a chance to do remaining GUI
// processing and terminate cleanly.
wxTheApp->HandleSockets();
if (wxTheApp->Pending())
if ( !wxTheApp->DoMessage() )
{
// WM_QUIT received: kill the thread
Kill();
return wxTHREAD_KILLED;
}
else
wxUsleep(10);
}
else
wxUsleep(10);
} while ( result != NO_ERROR );
#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 ( ::DosWaitThread(&hThread, DCWW_WAIT) != NO_ERROR )
{
wxFAIL_MSG(wxT("unexpected result of DosWaitThread"));
}
#endif // wxUSE_GUI/!wxUSE_GUI
if ( IsMain() )
{
gs_bWaitingForThread = false;
}
}
#if 0
// although the thread might be already in the EXITED state it might not
// have terminated yet and so we are not sure that it has actually
// terminated if the "if" above hadn't been taken
do
{
if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
{
wxLogLastError(wxT("GetExitCodeThread"));
rc = (ExitCode)-1;
}
} while ( (DWORD)rc == STILL_ACTIVE );
#endif
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;
}
if ( pRc )
*pRc = rc;
return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
}
wxThreadError wxThread::Kill()
{
if (!IsRunning())
return wxTHREAD_NOT_RUNNING;
::DosKillThread(m_internal->GetHandle());
if (IsDetached())
{
delete this;
}
return wxTHREAD_NO_ERROR;
}
void wxThread::Exit(ExitCode WXUNUSED(pStatus))
{
delete this;
_endthread();
wxFAIL_MSG(wxT("Couldn't return from DosExit()!"));
}
void wxThread::SetPriority(
unsigned int nPrio
)
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
m_internal->SetPriority(nPrio);
}
unsigned int wxThread::GetPriority() const
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return m_internal->GetPriority();
}
unsigned long wxThread::GetId() const
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
return (unsigned long)m_internal->GetId();
}
bool wxThread::IsRunning() const
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return(m_internal->GetState() == STATE_RUNNING);
}
bool wxThread::IsAlive() const
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return (m_internal->GetState() == STATE_RUNNING) ||
(m_internal->GetState() == STATE_PAUSED);
}
bool wxThread::IsPaused() const
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return (m_internal->GetState() == STATE_PAUSED);
}
bool wxThread::TestDestroy()
{
wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
return m_internal->GetState() == STATE_CANCELED;
}
// ----------------------------------------------------------------------------
// Automatic initialization for thread module
// ----------------------------------------------------------------------------
class wxThreadModule : public wxModule
{
public:
virtual bool OnInit();
virtual void OnExit();
private:
DECLARE_DYNAMIC_CLASS(wxThreadModule)
};
IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
bool wxThreadModule::OnInit()
{
gs_pCritsectWaitingForGui = new wxCriticalSection();
gs_pCritsectGui = new wxCriticalSection();
gs_pCritsectGui->Enter();
wxThread::ms_idMainThread = wxThread::GetCurrentId();
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
// ----------------------------------------------------------------------------
// wake up the main thread if it's in ::GetMessage()
void WXDLLEXPORT wxWakeUpMainThread()
{
#if 0
if ( !::WinPostQueueMsg(wxTheApp->m_hMq, WM_NULL, 0, 0) )
{
// should never happen
wxLogLastError(wxT("WinPostMessage(WM_NULL)"));
}
#endif
}
void wxMutexGuiEnterImpl()
{
// 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(*gs_pCritsectWaitingForGui);
gs_nWaitingForGui++;
}
wxWakeUpMainThread();
// now we may block here because the main thread will soon let us in
// (during the next iteration of OnIdle())
gs_pCritsectGui->Enter();
}
void wxMutexGuiLeaveImpl()
{
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?") );