// Created: 04/13/98
// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
-// Licence: wxWidgets licence
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_THREAD_H_
#if wxUSE_THREADS
-// only for wxUSE_THREADS - otherwise we'd get undefined symbols
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
- #pragma interface "thread.h"
-#endif
-
-// Windows headers define it
-#ifdef Yield
- #undef Yield
-#endif
-
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
wxMUTEX_DEAD_LOCK, // mutex is already locked by the calling thread
wxMUTEX_BUSY, // mutex is already locked by another thread
wxMUTEX_UNLOCKED, // attempt to unlock a mutex which is not locked
+ wxMUTEX_TIMEOUT, // LockTimeout() has timed out
wxMUTEX_MISC_ERROR // any other error
};
};
// forward declarations
-class WXDLLIMPEXP_BASE wxThreadHelper;
-class WXDLLIMPEXP_BASE wxConditionInternal;
-class WXDLLIMPEXP_BASE wxMutexInternal;
-class WXDLLIMPEXP_BASE wxSemaphoreInternal;
-class WXDLLIMPEXP_BASE wxThreadInternal;
+class WXDLLIMPEXP_FWD_BASE wxThreadHelper;
+class WXDLLIMPEXP_FWD_BASE wxConditionInternal;
+class WXDLLIMPEXP_FWD_BASE wxMutexInternal;
+class WXDLLIMPEXP_FWD_BASE wxSemaphoreInternal;
+class WXDLLIMPEXP_FWD_BASE wxThreadInternal;
// ----------------------------------------------------------------------------
// A mutex object is a synchronization object whose state is set to signaled
// The caller must call Unlock() later if Lock() returned wxMUTEX_NO_ERROR.
wxMutexError Lock();
+ // Same as Lock() but return wxMUTEX_TIMEOUT if the mutex can't be locked
+ // during the given number of milliseconds
+ wxMutexError LockTimeout(unsigned long ms);
+
// Try to lock the mutex: if it is currently locked, return immediately
// with an error. Otherwise the caller must call Unlock().
wxMutexError TryLock();
#if !defined(__WXMSW__)
#define wxCRITSECT_IS_MUTEX 1
- #define wxCRITSECT_INLINE inline
+ #define wxCRITSECT_INLINE WXEXPORT inline
#else // MSW
#define wxCRITSECT_IS_MUTEX 0
#define wxCRITSECT_INLINE
#endif // MSW/!MSW
+enum wxCriticalSectionType
+{
+ // recursive critical section
+ wxCRITSEC_DEFAULT,
+
+ // non-recursive critical section
+ wxCRITSEC_NON_RECURSIVE
+};
+
// you should consider wxCriticalSectionLocker whenever possible instead of
// directly working with wxCriticalSection class - it is safer
class WXDLLIMPEXP_BASE wxCriticalSection
{
public:
// ctor & dtor
- wxCRITSECT_INLINE wxCriticalSection();
+ wxCRITSECT_INLINE wxCriticalSection( wxCriticalSectionType critSecType = wxCRITSEC_DEFAULT );
wxCRITSECT_INLINE ~wxCriticalSection();
-
// enter the section (the same as locking a mutex)
wxCRITSECT_INLINE void Enter();
#if wxCRITSECT_IS_MUTEX
// implement wxCriticalSection using mutexes
- inline wxCriticalSection::wxCriticalSection() { }
+ 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(); }
#undef wxCRITSECT_IS_MUTEX
// wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is
-// to th mutexes
+// to mutexes
class WXDLLIMPEXP_BASE wxCriticalSectionLocker
{
public:
bool IsOk() const;
// NB: the associated mutex MUST be locked beforehand by the calling thread
- //
+ //
// it atomically releases the lock on the associated mutex
// and starts waiting to be woken up by a Signal()/Broadcast()
// once its signaled, then it will wait until it can reacquire
wxCondError Wait();
// exactly as Wait() except that it may also return if the specified
- // timeout ellapses even if the condition hasn't been signalled: in this
+ // timeout elapses even if the condition hasn't been signalled: in this
// case, the return value is false, otherwise (i.e. in case of a normal
// return) it is true
- //
- // the timeeout parameter specifies a interval that needs to be waited in
- // milliseconds
+ //
+ // the timeout parameter specifies an interval that needs to be waited for
+ // in milliseconds
wxCondError WaitTimeout(unsigned long milliseconds);
// NB: the associated mutex may or may not be locked by the calling thread
//
// this method unblocks one thread if any are blocking on the condition.
// if no thread is blocking in Wait(), then the signal is NOT remembered
- // The thread which was blocking on Wait(), will then reacquire the lock
+ // The thread which was blocking on Wait() will then reacquire the lock
// on the associated mutex object before returning
wxCondError Signal();
//
// this method unblocks all threads if any are blocking on the condition.
// if no thread is blocking in Wait(), then the signal is NOT remembered
- // The threads which were blocking on Wait(), will then reacquire the lock
+ // The threads which were blocking on Wait() will then reacquire the lock
// on the associated mutex object before returning.
wxCondError Broadcast();
+#if WXWIN_COMPATIBILITY_2_6
// deprecated version, don't use
- bool Wait(unsigned long milliseconds)
- { return WaitTimeout(milliseconds) == wxCOND_NO_ERROR; }
+ wxDEPRECATED( bool Wait(unsigned long milliseconds) );
+#endif // WXWIN_COMPATIBILITY_2_6
private:
wxConditionInternal *m_internal;
DECLARE_NO_COPY_CLASS(wxCondition)
};
+#if WXWIN_COMPATIBILITY_2_6
+ inline bool wxCondition::Wait(unsigned long milliseconds)
+ { return WaitTimeout(milliseconds) == wxCOND_NO_ERROR; }
+#endif // WXWIN_COMPATIBILITY_2_6
+
// ----------------------------------------------------------------------------
// wxSemaphore: a counter limiting the number of threads concurrently accessing
// a shared resource
wxSemaError TryWait();
// same as Wait(), but as a timeout limit, returns wxSEMA_NO_ERROR if the
- // semaphore was acquired and wxSEMA_TIMEOUT if the timeout has ellapsed
+ // semaphore was acquired and wxSEMA_TIMEOUT if the timeout has elapsed
wxSemaError WaitTimeout(unsigned long milliseconds);
// increments the semaphore count and signals one of the waiting threads
};
// ----------------------------------------------------------------------------
-// wxThread: class encpasulating a thread of execution
+// wxThread: class encapsulating a thread of execution
// ----------------------------------------------------------------------------
// there are two different kinds of threads: joinable and detached (default)
// Returns true if current thread is the main thread.
static bool IsMain();
- // Release the rest of our time slice leting the other threads run
+ // Release the rest of our time slice letting the other threads run
static void Yield();
// Sleep during the specified period of time in milliseconds
//
- // NB: at least under MSW worker threads can not call ::wxSleep()!
+ // This is the same as wxMilliSleep().
static void Sleep(unsigned long milliseconds);
// get the number of system CPUs - useful with SetConcurrency()
// 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);
// waits for a joinable thread to finish and returns its exit code
//
ExitCode Wait();
// kills the thread without giving it any chance to clean up - should
- // not be used in normal circumstances, use Delete() instead. It is a
- // dangerous function that should only be used in the most extreme
- // cases!
+ // not be used under normal circumstances, use Delete() instead.
+ // It is a dangerous function that should only be used in the most
+ // extreme cases!
//
// The wxThread object is deleted by Kill() if the thread is
// detachable, but you still have to delete it manually for joinable
// 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
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;
// the (platform-dependent) thread class implementation
public:
// constructor only creates the C++ thread object and doesn't create (or
// start) the real thread
- wxThreadHelperThread(wxThreadHelper& owner)
- : wxThread(wxTHREAD_JOINABLE), m_owner(owner)
+ wxThreadHelperThread(wxThreadHelper& owner, wxThreadKind kind)
+ : wxThread(kind), m_owner(owner)
{ }
protected:
private:
void KillThread()
{
+ // 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();
- delete m_thread;
+
+ if ( m_kind == wxTHREAD_JOINABLE )
+ delete m_thread;
+
+ m_thread = NULL;
}
}
public:
// constructor only initializes m_thread to NULL
- wxThreadHelper() : m_thread(NULL) { }
+ wxThreadHelper(wxThreadKind kind = wxTHREAD_JOINABLE)
+ : m_thread(NULL), m_kind(kind) { }
// 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_thread = new wxThreadHelperThread(*this);
+ m_kind = kind;
+ m_thread = new wxThreadHelperThread(*this, m_kind);
return m_thread->Create(stackSize);
}
virtual void *Entry() = 0;
// returns a pointer to the thread which can be used to call Run()
- wxThread *GetThread() const { return m_thread; }
+ wxThread *GetThread() const
+ {
+ wxCriticalSectionLocker locker((wxCriticalSection&)m_critSection);
+
+ wxThread* thread = m_thread;
+
+ return thread;
+ }
protected:
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()
{
- return m_owner.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;
}
// ----------------------------------------------------------------------------
#else // !wxUSE_THREADS
// no thread support
-inline void WXDLLIMPEXP_BASE wxMutexGuiEnter() { }
-inline void WXDLLIMPEXP_BASE wxMutexGuiLeave() { }
+inline void wxMutexGuiEnter() { }
+inline void wxMutexGuiLeave() { }
// macros for entering/leaving critical sections which may be used without
// having to take them inside "#if wxUSE_THREADS"
-#define wxENTER_CRIT_SECT(cs)
-#define wxLEAVE_CRIT_SECT(cs)
-#define wxCRIT_SECT_DECLARE(cs)
-#define wxCRIT_SECT_DECLARE_MEMBER(cs)
-#define wxCRIT_SECT_LOCKER(name, cs)
+// (the implementation uses dummy structs to force semicolon after the macro)
+#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_LOCKER(name, cs) struct wxDummyCSLocker##name
// if there is only one thread, it is always the main one
inline bool wxIsMainThread() { return true; }
#if wxUSE_THREADS
-#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXPM__) || defined(__EMX__)
+#if defined(__WXMSW__) || defined(__OS2__) || defined(__EMX__)
// 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
// returns true if the main thread has GUI lock
extern bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread();
-#ifndef __WXPM__
// wakes up the main thread if it's sleeping inside ::GetMessage()
extern void WXDLLIMPEXP_BASE wxWakeUpMainThread();
-#endif // !OS/2
// 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 // MSW, Mac, OS/2
+#endif // MSW, OS/2
#endif // wxUSE_THREADS
#endif // _WX_THREAD_H_
-
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