/////////////////////////////////////////////////////////////////////////////
-// Name: thread.cpp
-// Purpose: wxThread Implementation. For Unix ports, see e.g. src/gtk
-// Author: Original from Wolfram Gloger/Guilhem Lavaux
-// Modified by:
+// 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) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998)
+// Copyright: (c) Stefan Neis (2003)
// 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 "wx/module.h"
#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"
-#if wxUSE_THREADS
+#include <stdio.h>
-enum thread_state {
- STATE_IDLE = 0,
- STATE_RUNNING,
- STATE_CANCELED,
- STATE_EXITED
+#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
};
-/////////////////////////////////////////////////////////////////////////////
-// Static variables
-/////////////////////////////////////////////////////////////////////////////
+// ----------------------------------------------------------------------------
+// this module's globals
+// ----------------------------------------------------------------------------
-wxMutex *wxMainMutex; // controls access to all GUI functions
+// id of the main thread - the one which can call GUI functions without first
+// calling wxMutexGuiEnter()
+wxThreadIdType wxThread::ms_idMainThread = 0;
+wxMutex* p_wxMainMutex;
-/////////////////////////////////////////////////////////////////////////////
-// Windows implementation
-/////////////////////////////////////////////////////////////////////////////
+// OS2 substitute for Tls pointer the current parent thread object
+wxThread* m_pThread; // pointer to the wxWidgets thread object
-class wxMutexInternal {
+// 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:
- // TODO: internal mutex handle
+ 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;
};
-wxMutex::wxMutex()
+// 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))
{
- p_internal = new wxMutexInternal;
- // TODO: create internal mutext handle
- m_locked = 0;
+ APIRET ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE);
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Cannot create mutex."));
+ m_vMutex = NULL;
+ }
}
-wxMutex::~wxMutex()
+wxMutexInternal::~wxMutexInternal()
{
- if (m_locked > 0)
- wxDebugMsg("wxMutex warning: freeing a locked mutex (%d locks)\n", m_locked);
- // TODO: free internal mutext handle
+ if (m_vMutex)
+ {
+ if (::DosCloseMutexSem(m_vMutex))
+ {
+ wxLogLastError(wxT("DosCloseMutexSem(mutex)"));
+ }
+ }
}
-wxMutexError wxMutex::Lock()
+wxMutexError wxMutexInternal::TryLock()
{
- // TODO
- m_locked++;
- return wxMUTEX_NO_ERROR;
+ 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 wxMutex::TryLock()
+wxMutexError wxMutexInternal::LockTimeout(ULONG ulMilliseconds)
{
- // TODO
- m_locked++;
+ 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 wxMutex::Unlock()
+wxMutexError wxMutexInternal::Unlock()
{
- if (m_locked > 0)
- m_locked--;
+ APIRET ulrc;
- // TODO
+ ulrc = ::DosReleaseMutexSem(m_vMutex);
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Couldn't release a mutex"));
+ return wxMUTEX_MISC_ERROR;
+ }
return wxMUTEX_NO_ERROR;
}
-class wxConditionInternal {
+// --------------------------------------------------------------------------
+// wxSemaphore
+// --------------------------------------------------------------------------
+
+// a trivial wrapper around OS2 event semaphore
+class wxSemaphoreInternal
+{
public:
- // TODO: internal handle
- int waiters;
+ 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;
};
-wxCondition::wxCondition()
+wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
{
- p_internal = new wxConditionInternal;
- // TODO: create internal handle
- p_internal->waiters = 0;
+ 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);
}
-wxCondition::~wxCondition()
+wxSemaphoreInternal::~wxSemaphoreInternal()
{
- // TODO: destroy internal handle
+ if ( m_vEvent )
+ {
+ if ( ::DosCloseEventSem(m_vEvent) )
+ {
+ wxLogLastError(wxT("DosCloseEventSem(semaphore)"));
+ }
+ if ( ::DosCloseMutexSem(m_vMutex) )
+ {
+ wxLogLastError(wxT("DosCloseMutexSem(semaphore)"));
+ }
+ else
+ m_vEvent = NULL;
+ }
}
-void wxCondition::Wait(wxMutex& mutex)
+wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long ulMilliseconds)
{
- mutex.Unlock();
- p_internal->waiters++;
- // TODO wait here
- p_internal->waiters--;
- mutex.Lock();
+ 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;
}
-bool wxCondition::Wait(wxMutex& mutex, unsigned long sec,
- unsigned long nsec)
+wxSemaError wxSemaphoreInternal::Post()
{
- mutex.Unlock();
- p_internal->waiters++;
+ 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)"));
- // TODO wait here
- p_internal->waiters--;
- mutex.Lock();
+ return wxSEMA_MISC_ERROR;
+ }
- return FALSE;
+ return wxSEMA_NO_ERROR;
}
-void wxCondition::Signal()
+// ----------------------------------------------------------------------------
+// wxThread implementation
+// ----------------------------------------------------------------------------
+
+// wxThreadInternal class
+// ----------------------
+
+class wxThreadInternal
{
- // TODO
+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 wxCondition::Broadcast()
+void wxThreadInternal::SetPriority(
+ unsigned int nPriority
+)
{
- // TODO
+ // 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"));
+ }
}
-class wxThreadInternal {
-public:
- // TODO
-};
+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);
+ }
-wxThreadError wxThread::Create()
+ return true;
+}
+
+bool wxThreadInternal::Suspend()
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ ULONG ulrc = ::DosSuspendThread(m_hThread);
+
+ if (ulrc != 0)
+ {
+ wxLogSysError(_("Cannot suspend thread %lu"), m_hThread);
+ return false;
+ }
+ m_eState = STATE_PAUSED;
+
+ return true;
}
-wxThreadError wxThread::Destroy()
+bool wxThreadInternal::Resume()
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ 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;
}
-wxThreadError wxThread::Pause()
+// static functions
+// ----------------
+
+wxThread *wxThread::This()
{
- // TODO
- return wxTHREAD_NO_ERROR;
+ wxThread* pThread = m_pThread;
+ return pThread;
}
-wxThreadError wxThread::Resume()
+#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()
{
- // TODO
+ 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;
}
-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;
+ 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;
}
-void wxThread::DeferDestroy(bool on)
+// stopping thread
+// ---------------
+
+wxThread::ExitCode wxThread::Wait(wxThreadWait waitMode)
{
- // 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,
+ wxT("can't wait for detached thread") );
+ ExitCode rc = (ExitCode)-1;
+ (void)Delete(&rc, waitMode);
+ return(rc);
}
-void wxThread::TestDestroy()
+wxThreadError wxThread::Delete(ExitCode *pRc, wxThreadWait WXUNUSED(waitMode))
{
- // TODO
+ 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;
}
-void *wxThread::Join()
+wxThreadError wxThread::Kill()
{
- // TODO
- return (void*) NULL;
+ if (!IsRunning())
+ return wxTHREAD_NOT_RUNNING;
+
+ ::DosKillThread(m_internal->GetHandle());
+ if (IsDetached())
+ {
+ delete this;
+ }
+ return wxTHREAD_NO_ERROR;
}
-unsigned long wxThread::GetID() const
+void wxThread::Exit(ExitCode WXUNUSED(pStatus))
{
- // TODO
- return 0;
+ delete this;
+ _endthread();
+ 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;
- }
-
- // Global cleanup
- virtual void OnExit() {
- wxMainMutex->Unlock();
- delete wxMainMutex;
- }
+ 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?") );
+
+ 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;
+}
+
+// ----------------------------------------------------------------------------
+// include common implementation code
+// ----------------------------------------------------------------------------
+
+#include "wx/thrimpl.cpp"
+
#endif
// wxUSE_THREADS
projects / wxWidgets.git / blobdiff