// Modified by: Vadim Zeitlin (modifications partly inspired by omnithreads
// package from Olivetti & Oracle Research Laboratory)
// Created: 04/13/98
-// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
wxTHREAD_JOINABLE
};
-// defines the interval of priority
+enum wxThreadWait
+{
+ wxTHREAD_WAIT_BLOCK,
+ wxTHREAD_WAIT_YIELD, // process events while waiting; MSW only
+
+ // For compatibility reasons we use wxTHREAD_WAIT_YIELD by default as this
+ // was the default behaviour of wxMSW 2.8 but it should be avoided as it's
+ // dangerous and not portable.
+#if WXWIN_COMPATIBILITY_2_8
+ wxTHREAD_WAIT_DEFAULT = wxTHREAD_WAIT_YIELD
+#else
+ wxTHREAD_WAIT_DEFAULT = wxTHREAD_WAIT_BLOCK
+#endif
+};
+
+// Obsolete synonyms for wxPRIORITY_XXX for backwards compatibility-only
enum
{
- WXTHREAD_MIN_PRIORITY = 0u,
- WXTHREAD_DEFAULT_PRIORITY = 50u,
- WXTHREAD_MAX_PRIORITY = 100u
+ WXTHREAD_MIN_PRIORITY = wxPRIORITY_MIN,
+ WXTHREAD_DEFAULT_PRIORITY = wxPRIORITY_DEFAULT,
+ WXTHREAD_MAX_PRIORITY = wxPRIORITY_MAX
};
// There are 2 types of mutexes: normal mutexes and recursive ones. The attempt
friend class wxConditionInternal;
- DECLARE_NO_COPY_CLASS(wxMutex)
+ wxDECLARE_NO_COPY_CLASS(wxMutex);
};
// a helper class which locks the mutex in the ctor and unlocks it in the dtor:
// in order to avoid any overhead under platforms where critical sections are
// just mutexes make all wxCriticalSection class functions inline
-#if !defined(__WXMSW__)
+#if !defined(__WINDOWS__)
#define wxCRITSECT_IS_MUTEX 1
#define wxCRITSECT_INLINE WXEXPORT inline
// enter the section (the same as locking a mutex)
wxCRITSECT_INLINE void Enter();
+ // try to enter the section (the same as trying to lock a mutex)
+ wxCRITSECT_INLINE bool TryEnter();
+
// leave the critical section (same as unlocking a mutex)
wxCRITSECT_INLINE void Leave();
private:
#if wxCRITSECT_IS_MUTEX
wxMutex m_mutex;
-#elif defined(__WXMSW__)
+#elif defined(__WINDOWS__)
// we can't allocate any memory in the ctor, so use placement new -
// unfortunately, we have to hardcode the sizeof() here because we can't
// include windows.h from this public header and we also have to use the
//
// if CRITICAL_SECTION size changes in Windows, you'll get an assert from
// thread.cpp and will need to increase the buffer size
- //
- // finally, we need this typedef instead of declaring m_buffer directly
- // because otherwise the assert mentioned above wouldn't compile with some
- // compilers (notably CodeWarrior 8)
#ifdef __WIN64__
typedef char wxCritSectBuffer[40];
#else // __WIN32__
};
#endif // Unix&OS2/Win32
- DECLARE_NO_COPY_CLASS(wxCriticalSection)
+ wxDECLARE_NO_COPY_CLASS(wxCriticalSection);
};
#if wxCRITSECT_IS_MUTEX
// implement wxCriticalSection using mutexes
- inline wxCriticalSection::wxCriticalSection( wxCriticalSectionType critSecType )
+ inline wxCriticalSection::wxCriticalSection( wxCriticalSectionType critSecType )
: m_mutex( critSecType == wxCRITSEC_DEFAULT ? wxMUTEX_RECURSIVE : wxMUTEX_DEFAULT ) { }
inline wxCriticalSection::~wxCriticalSection() { }
inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
+ inline bool wxCriticalSection::TryEnter() { return m_mutex.TryLock() == wxMUTEX_NO_ERROR; }
inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
#endif // wxCRITSECT_IS_MUTEX
private:
wxCriticalSection& m_critsect;
- DECLARE_NO_COPY_CLASS(wxCriticalSectionLocker)
+ wxDECLARE_NO_COPY_CLASS(wxCriticalSectionLocker);
};
// ----------------------------------------------------------------------------
private:
wxConditionInternal *m_internal;
- DECLARE_NO_COPY_CLASS(wxCondition)
+ wxDECLARE_NO_COPY_CLASS(wxCondition);
};
#if WXWIN_COMPATIBILITY_2_6
private:
wxSemaphoreInternal *m_internal;
- DECLARE_NO_COPY_CLASS(wxSemaphore)
+ wxDECLARE_NO_COPY_CLASS(wxSemaphore);
};
// ----------------------------------------------------------------------------
static wxThread *This();
// Returns true if current thread is the main thread.
- static bool IsMain();
+ //
+ // Notice that it also returns true if main thread id hadn't been
+ // initialized yet on the assumption that it's too early in wx startup
+ // process for any other threads to have been created in this case.
+ static bool IsMain()
+ {
+ return !ms_idMainThread || GetCurrentId() == ms_idMainThread;
+ }
+
+ // Return the main thread id
+ static wxThreadIdType GetMainId() { return ms_idMainThread; }
// Release the rest of our time slice letting the other threads run
static void Yield();
// Get the platform specific thread ID and return as a long. This
// can be used to uniquely identify threads, even if they are not
// wxThreads. This is used by wxPython.
- static wxThreadIdType GetCurrentId();
+ static wxThreadIdType GetCurrentId();
// sets the concurrency level: this is, roughly, the number of threads
// the system tries to schedule to run in parallel. 0 means the
// does it!
//
// will fill the rc pointer with the thread exit code if it's !NULL
- wxThreadError Delete(ExitCode *rc = (ExitCode *)NULL);
+ wxThreadError Delete(ExitCode *rc = NULL,
+ wxThreadWait waitMode = wxTHREAD_WAIT_DEFAULT);
// waits for a joinable thread to finish and returns its exit code
//
// Returns (ExitCode)-1 on error (for example, if the thread is not
// joinable)
- ExitCode Wait();
+ ExitCode Wait(wxThreadWait waitMode = wxTHREAD_WAIT_DEFAULT);
// kills the thread without giving it any chance to clean up - should
// not be used under normal circumstances, use Delete() instead.
wxThreadError Resume();
// priority
- // Sets the priority to "prio": see WXTHREAD_XXX_PRIORITY constants
+ // Sets the priority to "prio" which must be in 0..100 range (see
+ // also wxPRIORITY_XXX constants).
//
// NB: the priority can only be set before the thread is created
void SetPriority(unsigned int prio);
// identifies a thread inside a process
wxThreadIdType GetId() const;
- // called when the thread exits - in the context of this thread
- //
- // NB: this function will not be called if the thread is Kill()ed
- virtual void OnExit() { }
+ wxThreadKind GetKind() const
+ { return m_isDetached ? wxTHREAD_DETACHED : wxTHREAD_JOINABLE; }
// Returns true if the thread was asked to terminate: this function should
// be called by the thread from time to time, otherwise the main thread
// of this thread.
virtual void *Entry() = 0;
+
+ // Callbacks which may be overridden by the derived class to perform some
+ // specific actions when the thread is deleted or killed. By default they
+ // do nothing.
+
+ // This one is called by Delete() before actually deleting the thread and
+ // is executed in the context of the thread that called Delete().
+ virtual void OnDelete() {}
+
+ // This one is called by Kill() before killing the thread and is executed
+ // in the context of the thread that called Kill().
+ virtual void OnKill() {}
+
private:
// no copy ctor/assignment operator
wxThread(const wxThread&);
wxThread& operator=(const wxThread&);
+ // called when the thread exits - in the context of this thread
+ //
+ // NB: this function will not be called if the thread is Kill()ed
+ virtual void OnExit() { }
+
friend class wxThreadInternal;
+ friend class wxThreadModule;
+
+
+ // the main thread identifier, should be set on startup
+ static wxThreadIdType ms_idMainThread;
// the (platform-dependent) thread class implementation
wxThreadInternal *m_internal;
private:
void KillThread()
{
- // If detached thread is about to finish, it will set
- // m_thread to NULL so don't delete it then
- // But if KillThread is called before detached thread
- // sets it to NULL, then the thread object still
- // exists and can be killed
+ // If wxThreadHelperThread is detached and is about to finish, it will
+ // set m_thread to NULL so don't delete it then.
+ // But if KillThread is called before wxThreadHelperThread (in detached mode)
+ // sets it to NULL, then the thread object still exists and can be killed
wxCriticalSectionLocker locker(m_critSection);
-
+
if ( m_thread )
{
m_thread->Kill();
-
+
if ( m_kind == wxTHREAD_JOINABLE )
delete m_thread;
-
+
m_thread = NULL;
}
}
// destructor deletes m_thread
virtual ~wxThreadHelper() { KillThread(); }
+#if WXWIN_COMPATIBILITY_2_8
+ wxDEPRECATED( wxThreadError Create(unsigned int stackSize = 0) );
+#endif
+
// create a new thread (and optionally set the stack size on platforms that
// support/need that), call Run() to start it
- wxThreadError Create(unsigned int stackSize = 0)
+ wxThreadError CreateThread(wxThreadKind kind = wxTHREAD_JOINABLE,
+ unsigned int stackSize = 0)
{
KillThread();
+ m_kind = kind;
m_thread = new wxThreadHelperThread(*this, m_kind);
return m_thread->Create(stackSize);
wxThread *GetThread() const
{
wxCriticalSectionLocker locker((wxCriticalSection&)m_critSection);
-
+
wxThread* thread = m_thread;
-
+
return thread;
}
wxThread *m_thread;
wxThreadKind m_kind;
wxCriticalSection m_critSection; // To guard the m_thread variable
-
+
friend class wxThreadHelperThread;
};
+#if WXWIN_COMPATIBILITY_2_8
+inline wxThreadError wxThreadHelper::Create(unsigned int stackSize)
+{ return CreateThread(m_kind, stackSize); }
+#endif
+
// call Entry() in owner, put it down here to avoid circular declarations
inline void *wxThreadHelperThread::Entry()
{
void * const result = m_owner.Entry();
-
+
wxCriticalSectionLocker locker(m_owner.m_critSection);
-
+
// Detached thread will be deleted after returning, so make sure
// wxThreadHelper::GetThread will not return an invalid pointer.
// And that wxThreadHelper::KillThread will not try to kill
// an already deleted thread
if ( m_owner.m_kind == wxTHREAD_DETACHED )
m_owner.m_thread = NULL;
-
+
return result;
}
// macros for entering/leaving critical sections which may be used without
// having to take them inside "#if wxUSE_THREADS"
-// (the implementation uses dummy structs to force semicolon after the macro)
+// (the implementation uses dummy structs to force semicolon after the macro;
+// also notice that Watcom doesn't like declaring a struct as a member so we
+// need to actually define it in wxCRIT_SECT_DECLARE_MEMBER)
#define wxENTER_CRIT_SECT(cs) do {} while (0)
#define wxLEAVE_CRIT_SECT(cs) do {} while (0)
#define wxCRIT_SECT_DECLARE(cs) struct wxDummyCS##cs
-#define wxCRIT_SECT_DECLARE_MEMBER(cs) struct wxDummyCSMember##cs
+#define wxCRIT_SECT_DECLARE_MEMBER(cs) struct wxDummyCSMember##cs { }
#define wxCRIT_SECT_LOCKER(name, cs) struct wxDummyCSLocker##name
// if there is only one thread, it is always the main one
#if wxUSE_THREADS
-#if defined(__WXMSW__) || defined(__OS2__) || defined(__EMX__)
+#if defined(__WINDOWS__) || defined(__OS2__) || defined(__EMX__) || defined(__DARWIN__)
// unlock GUI if there are threads waiting for and lock it back when
// there are no more of them - should be called periodically by the main
// thread
// wakes up the main thread if it's sleeping inside ::GetMessage()
extern void WXDLLIMPEXP_BASE wxWakeUpMainThread();
+#ifndef __DARWIN__
// return true if the main thread is waiting for some other to terminate:
// wxApp then should block all "dangerous" messages
extern bool WXDLLIMPEXP_BASE wxIsWaitingForThread();
+#endif
#endif // MSW, OS/2
#endif // wxUSE_THREADS
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