be52b34172
provide implicit copy constructor or assignement (will be corrected) git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15427 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
607 lines
21 KiB
C++
607 lines
21 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: thread.h
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// Purpose: Thread API
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// Author: Guilhem Lavaux
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// Modified by: Vadim Zeitlin (modifications partly inspired by omnithreads
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// package from Olivetti & Oracle Research Laboratory)
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// Created: 04/13/98
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// RCS-ID: $Id$
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// Copyright: (c) Guilhem Lavaux
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef __THREADH__
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#define __THREADH__
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// get the value of wxUSE_THREADS configuration flag
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#include "wx/setup.h"
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#if wxUSE_THREADS
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// only for wxUSE_THREADS - otherwise we'd get undefined symbols
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#ifdef __GNUG__
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#pragma interface "thread.h"
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#endif
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// Windows headers define it
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#ifdef Yield
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#undef Yield
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#endif
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#include "wx/module.h"
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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enum wxMutexError
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{
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wxMUTEX_NO_ERROR = 0,
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wxMUTEX_DEAD_LOCK, // Mutex has been already locked by THE CALLING thread
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wxMUTEX_BUSY, // Mutex has been already locked by ONE thread
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wxMUTEX_UNLOCKED,
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wxMUTEX_MISC_ERROR
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};
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enum wxThreadError
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{
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wxTHREAD_NO_ERROR = 0, // No error
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wxTHREAD_NO_RESOURCE, // No resource left to create a new thread
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wxTHREAD_RUNNING, // The thread is already running
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wxTHREAD_NOT_RUNNING, // The thread isn't running
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wxTHREAD_KILLED, // Thread we waited for had to be killed
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wxTHREAD_MISC_ERROR // Some other error
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};
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enum wxThreadKind
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{
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wxTHREAD_DETACHED,
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wxTHREAD_JOINABLE
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};
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// defines the interval of priority
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enum
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{
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WXTHREAD_MIN_PRIORITY = 0u,
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WXTHREAD_DEFAULT_PRIORITY = 50u,
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WXTHREAD_MAX_PRIORITY = 100u
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};
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// ----------------------------------------------------------------------------
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// A mutex object is a synchronization object whose state is set to signaled
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// when it is not owned by any thread, and nonsignaled when it is owned. Its
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// name comes from its usefulness in coordinating mutually-exclusive access to
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// a shared resource. Only one thread at a time can own a mutex object.
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// ----------------------------------------------------------------------------
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// you should consider wxMutexLocker whenever possible instead of directly
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// working with wxMutex class - it is safer
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class WXDLLEXPORT wxConditionInternal;
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class WXDLLEXPORT wxMutexInternal;
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class WXDLLEXPORT wxMutex
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{
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public:
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// constructor & destructor
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wxMutex();
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~wxMutex();
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// Lock the mutex.
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wxMutexError Lock();
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// Try to lock the mutex: if it can't, returns immediately with an error.
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wxMutexError TryLock();
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// Unlock the mutex.
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wxMutexError Unlock();
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// Returns true if the mutex is locked.
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bool IsLocked() const { return (m_locked > 0); }
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protected:
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// no assignment operator nor copy ctor
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wxMutex(const wxMutex&);
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wxMutex& operator=(const wxMutex&);
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int m_locked;
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wxMutexInternal *m_internal;
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friend class wxConditionInternal;
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};
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// a helper class which locks the mutex in the ctor and unlocks it in the dtor:
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// this ensures that mutex is always unlocked, even if the function returns or
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// throws an exception before it reaches the end
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class WXDLLEXPORT wxMutexLocker
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{
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public:
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// lock the mutex in the ctor
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wxMutexLocker(wxMutex& mutex)
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: m_isOk(FALSE), m_mutex(mutex)
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{ m_isOk = ( m_mutex.Lock() == wxMUTEX_NO_ERROR ); }
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// returns TRUE if mutex was successfully locked in ctor
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bool IsOk() const
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{ return m_isOk; }
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// unlock the mutex in dtor
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~wxMutexLocker()
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{ if ( IsOk() ) m_mutex.Unlock(); }
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private:
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// no assignment operator nor copy ctor
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wxMutexLocker(const wxMutexLocker&);
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wxMutexLocker& operator=(const wxMutexLocker&);
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bool m_isOk;
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wxMutex& m_mutex;
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};
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// ----------------------------------------------------------------------------
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// Critical section: this is the same as mutex but is only visible to the
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// threads of the same process. For the platforms which don't have native
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// support for critical sections, they're implemented entirely in terms of
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// mutexes.
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//
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// NB: wxCriticalSection object does not allocate any memory in its ctor
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// which makes it possible to have static globals of this class
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxCriticalSectionInternal;
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// in order to avoid any overhead under platforms where critical sections are
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// just mutexes make all wxCriticalSection class functions inline
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#if !defined(__WXMSW__) && !defined(__WXPM__)
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#define WXCRITICAL_INLINE inline
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#define wxCRITSECT_IS_MUTEX 1
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#else // MSW || OS2
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#define WXCRITICAL_INLINE
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#define wxCRITSECT_IS_MUTEX 0
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#endif // MSW/!MSW
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// you should consider wxCriticalSectionLocker whenever possible instead of
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// directly working with wxCriticalSection class - it is safer
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class WXDLLEXPORT wxCriticalSection
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{
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public:
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// ctor & dtor
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WXCRITICAL_INLINE wxCriticalSection();
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WXCRITICAL_INLINE ~wxCriticalSection();
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// enter the section (the same as locking a mutex)
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WXCRITICAL_INLINE void Enter();
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// leave the critical section (same as unlocking a mutex)
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WXCRITICAL_INLINE void Leave();
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private:
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// no assignment operator nor copy ctor
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wxCriticalSection(const wxCriticalSection&);
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wxCriticalSection& operator=(const wxCriticalSection&);
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#if wxCRITSECT_IS_MUTEX
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wxMutex m_mutex;
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#elif defined(__WXMSW__)
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// we can't allocate any memory in the ctor, so use placement new -
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// unfortunately, we have to hardcode the sizeof() here because we can't
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// include windows.h from this public header
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char m_buffer[24];
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#elif !defined(__WXPM__)
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wxCriticalSectionInternal *m_critsect;
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#else
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// nothing for OS/2
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#endif // !Unix/Unix
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};
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// keep your preprocessor name space clean
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#undef WXCRITICAL_INLINE
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// wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is
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// to th mutexes
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class WXDLLEXPORT wxCriticalSectionLocker
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{
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public:
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inline wxCriticalSectionLocker(wxCriticalSection& critsect);
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inline ~wxCriticalSectionLocker();
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private:
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// no assignment operator nor copy ctor
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wxCriticalSectionLocker(const wxCriticalSectionLocker&);
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wxCriticalSectionLocker& operator=(const wxCriticalSectionLocker&);
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wxCriticalSection& m_critsect;
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};
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// ----------------------------------------------------------------------------
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// wxCondition models a POSIX condition variable which allows one (or more)
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// thread(s) to wait until some condition is fulfilled
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxCondition
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{
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DECLARE_NO_COPY_CLASS(wxCondition)
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public:
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// constructor and destructor
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// Each wxCondition object is associated with with a wxMutex object The
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// mutex object MUST be locked before calling Wait()
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wxCondition(wxMutex& mutex);
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// dtor is not virtual, don't use this class polymorphically
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~wxCondition();
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// NB: the associated mutex MUST be locked beforehand by the calling thread
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//
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// it atomically releases the lock on the associated mutex
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// and starts waiting to be woken up by a Signal()/Broadcast()
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// once its signaled, then it will wait until it can reacquire
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// the lock on the associated mutex object, before returning.
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void Wait();
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// exactly as Wait() except that it may also return if the specified
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// timeout ellapses even if the condition hasn't been signalled: in this
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// case, the return value is FALSE, otherwise (i.e. in case of a normal
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// return) it is TRUE
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//
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// the timeeout parameter specifies a interval that needs to be waited in
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// milliseconds
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bool Wait( unsigned long timeout_millis );
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// NB: the associated mutex may or may not be locked by the calling thread
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//
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// this method unblocks one thread if any are blocking on the condition.
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// if no thread is blocking in Wait(), then the signal is NOT remembered
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// The thread which was blocking on Wait(), will then reacquire the lock
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// on the associated mutex object before returning
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void Signal();
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// NB: the associated mutex may or may not be locked by the calling thread
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//
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// this method unblocks all threads if any are blocking on the condition.
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// if no thread is blocking in Wait(), then the signal is NOT remembered
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// The threads which were blocking on Wait(), will then reacquire the lock
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// on the associated mutex object before returning.
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void Broadcast();
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private:
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wxConditionInternal *m_internal;
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};
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// ----------------------------------------------------------------------------
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// wxSemaphore: a counter limiting the number of threads concurrently accessing
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// a shared resource
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxSemaphoreInternal;
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class WXDLLEXPORT wxSemaphore
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{
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DECLARE_NO_COPY_CLASS(wxSemaphore)
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public:
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// specifying a maxcount of 0 actually makes wxSemaphore behave as if there
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// is no upper limit, if maxcount is 1 the semaphore behaves as a mutex
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wxSemaphore( int initialcount = 0, int maxcount = 0 );
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// dtor is not virtual, don't use this class polymorphically
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~wxSemaphore();
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// wait indefinitely, until the semaphore count goes beyond 0
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// and then decrement it and return (this method might have been called
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// Acquire())
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void Wait();
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// same as Wait(), but does not block, returns TRUE if successful and
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// FALSE if the count is zero
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bool TryWait();
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// same as Wait(), but as a timeout limit, returns TRUE if the semaphore
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// was acquired and FALSE if the timeout has ellapsed
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bool Wait( unsigned long timeout_millis );
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// increments the semaphore count and signals one of the waiting threads
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void Post();
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private:
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wxSemaphoreInternal *m_internal;
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};
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// ----------------------------------------------------------------------------
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// wxThread: class encpasulating a thread of execution
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// ----------------------------------------------------------------------------
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// there are two different kinds of threads: joinable and detached (default)
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// ones. Only joinable threads can return a return code and only detached
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// threads auto-delete themselves - the user should delete the joinable
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// threads manually.
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// NB: in the function descriptions the words "this thread" mean the thread
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// created by the wxThread object while "main thread" is the thread created
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// during the process initialization (a.k.a. the GUI thread)
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// On VMS thread pointers are 64 bits (also needed for other systems???
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#ifdef __VMS
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typedef unsigned long long wxThreadIdType;
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#else
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typedef unsigned long wxThreadIdType;
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#endif
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class wxThreadInternal;
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class WXDLLEXPORT wxThread
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{
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public:
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// the return type for the thread function
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typedef void *ExitCode;
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// static functions
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// Returns the wxThread object for the calling thread. NULL is returned
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// if the caller is the main thread (but it's recommended to use
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// IsMain() and only call This() for threads other than the main one
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// because NULL is also returned on error). If the thread wasn't
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// created with wxThread class, the returned value is undefined.
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static wxThread *This();
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// Returns true if current thread is the main thread.
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static bool IsMain();
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// Release the rest of our time slice leting the other threads run
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static void Yield();
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// Sleep during the specified period of time in milliseconds
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//
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// NB: at least under MSW worker threads can not call ::wxSleep()!
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static void Sleep(unsigned long milliseconds);
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// get the number of system CPUs - useful with SetConcurrency()
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// (the "best" value for it is usually number of CPUs + 1)
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//
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// Returns -1 if unknown, number of CPUs otherwise
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static int GetCPUCount();
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// Get the platform specific thread ID and return as a long. This
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// can be used to uniquely identify threads, even if they are not
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// wxThreads. This is used by wxPython.
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static wxThreadIdType GetCurrentId();
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// sets the concurrency level: this is, roughly, the number of threads
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// the system tries to schedule to run in parallel. 0 means the
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// default value (usually acceptable, but may not yield the best
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// performance for this process)
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//
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// Returns TRUE on success, FALSE otherwise (if not implemented, for
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// example)
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static bool SetConcurrency(size_t level);
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// constructor only creates the C++ thread object and doesn't create (or
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// start) the real thread
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wxThread(wxThreadKind kind = wxTHREAD_DETACHED);
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// functions that change the thread state: all these can only be called
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// from _another_ thread (typically the thread that created this one, e.g.
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// the main thread), not from the thread itself
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// create a new thread and optionally set the stack size on
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// platforms that support that - call Run() to start it
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// (special cased for watcom which won't accept 0 default)
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wxThreadError Create(unsigned int stackSize = 0);
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// starts execution of the thread - from the moment Run() is called
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// the execution of wxThread::Entry() may start at any moment, caller
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// shouldn't suppose that it starts after (or before) Run() returns.
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wxThreadError Run();
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// stops the thread if it's running and deletes the wxThread object if
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// this is a detached thread freeing its memory - otherwise (for
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// joinable threads) you still need to delete wxThread object
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// yourself.
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//
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// this function only works if the thread calls TestDestroy()
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// periodically - the thread will only be deleted the next time it
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// does it!
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//
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// will fill the rc pointer with the thread exit code if it's !NULL
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wxThreadError Delete(ExitCode *rc = (ExitCode *)NULL);
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// waits for a joinable thread to finish and returns its exit code
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//
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// Returns (ExitCode)-1 on error (for example, if the thread is not
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// joinable)
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ExitCode Wait();
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// kills the thread without giving it any chance to clean up - should
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// not be used in normal circumstances, use Delete() instead. It is a
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// dangerous function that should only be used in the most extreme
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// cases!
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//
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// The wxThread object is deleted by Kill() if the thread is
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// detachable, but you still have to delete it manually for joinable
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// threads.
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wxThreadError Kill();
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// pause a running thread: as Delete(), this only works if the thread
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// calls TestDestroy() regularly
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wxThreadError Pause();
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// resume a paused thread
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wxThreadError Resume();
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// priority
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// Sets the priority to "prio": see WXTHREAD_XXX_PRIORITY constants
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//
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// NB: the priority can only be set before the thread is created
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void SetPriority(unsigned int prio);
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// Get the current priority.
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unsigned int GetPriority() const;
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// thread status inquiries
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// Returns true if the thread is alive: i.e. running or suspended
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bool IsAlive() const;
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// Returns true if the thread is running (not paused, not killed).
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bool IsRunning() const;
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// Returns true if the thread is suspended
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bool IsPaused() const;
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// is the thread of detached kind?
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bool IsDetached() const { return m_isDetached; }
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// Get the thread ID - a platform dependent number which uniquely
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// identifies a thread inside a process
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wxThreadIdType GetId() const;
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// called when the thread exits - in the context of this thread
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//
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// NB: this function will not be called if the thread is Kill()ed
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virtual void OnExit() { }
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// dtor is public, but the detached threads should never be deleted - use
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// Delete() instead (or leave the thread terminate by itself)
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virtual ~wxThread();
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protected:
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// Returns TRUE if the thread was asked to terminate: this function should
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// be called by the thread from time to time, otherwise the main thread
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// will be left forever in Delete()!
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bool TestDestroy();
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// exits from the current thread - can be called only from this thread
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void Exit(ExitCode exitcode = 0);
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// entry point for the thread - called by Run() and executes in the context
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// of this thread.
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virtual void *Entry() = 0;
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private:
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// no copy ctor/assignment operator
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wxThread(const wxThread&);
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wxThread& operator=(const wxThread&);
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friend class wxThreadInternal;
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// the (platform-dependent) thread class implementation
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wxThreadInternal *m_internal;
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// protects access to any methods of wxThreadInternal object
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wxCriticalSection m_critsect;
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// true if the thread is detached, false if it is joinable
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bool m_isDetached;
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};
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// ----------------------------------------------------------------------------
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// Automatic initialization
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// ----------------------------------------------------------------------------
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// GUI mutex handling.
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void WXDLLEXPORT wxMutexGuiEnter();
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void WXDLLEXPORT wxMutexGuiLeave();
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// macros for entering/leaving critical sections which may be used without
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// having to take them inside "#if wxUSE_THREADS"
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#define wxENTER_CRIT_SECT(cs) (cs).Enter()
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#define wxLEAVE_CRIT_SECT(cs) (cs).Leave()
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#define wxCRIT_SECT_DECLARE(cs) static wxCriticalSection cs
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#define wxCRIT_SECT_LOCKER(name, cs) wxCriticalSectionLocker name(cs)
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#else // !wxUSE_THREADS
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#include "wx/defs.h" // for WXDLLEXPORT
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// no thread support
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inline void WXDLLEXPORT wxMutexGuiEnter() { }
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inline void WXDLLEXPORT wxMutexGuiLeave() { }
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// macros for entering/leaving critical sections which may be used without
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// having to take them inside "#if wxUSE_THREADS"
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#define wxENTER_CRIT_SECT(cs)
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#define wxLEAVE_CRIT_SECT(cs)
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#define wxCRIT_SECT_DECLARE(cs)
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#define wxCRIT_SECT_LOCKER(name, cs)
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#endif // wxUSE_THREADS
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// automatically unlock GUI mutex in dtor
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class WXDLLEXPORT wxMutexGuiLocker
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{
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public:
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wxMutexGuiLocker() { wxMutexGuiEnter(); }
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~wxMutexGuiLocker() { wxMutexGuiLeave(); }
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};
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// -----------------------------------------------------------------------------
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// implementation only until the end of file
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// -----------------------------------------------------------------------------
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#if wxUSE_THREADS
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#if defined(__WXMSW__)
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// unlock GUI if there are threads waiting for and lock it back when
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// there are no more of them - should be called periodically by the main
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// thread
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extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
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// returns TRUE if the main thread has GUI lock
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extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
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// wakes up the main thread if it's sleeping inside ::GetMessage()
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extern void WXDLLEXPORT wxWakeUpMainThread();
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// return TRUE if the main thread is waiting for some other to terminate:
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// wxApp then should block all "dangerous" messages
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extern bool WXDLLEXPORT wxIsWaitingForThread();
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#elif defined(__WXMAC__)
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extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
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// returns TRUE if the main thread has GUI lock
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extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
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// wakes up the main thread if it's sleeping inside ::GetMessage()
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extern void WXDLLEXPORT wxWakeUpMainThread();
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// return TRUE if the main thread is waiting for some other to terminate:
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// wxApp then should block all "dangerous" messages
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extern bool WXDLLEXPORT wxIsWaitingForThread();
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// implement wxCriticalSection using mutexes
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inline wxCriticalSection::wxCriticalSection() : m_mutex() { }
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inline wxCriticalSection::~wxCriticalSection() { }
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inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
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inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
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#elif defined(__WXPM__)
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// unlock GUI if there are threads waiting for and lock it back when
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// there are no more of them - should be called periodically by the main
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// thread
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extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
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// returns TRUE if the main thread has GUI lock
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extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
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// return TRUE if the main thread is waiting for some other to terminate:
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// wxApp then should block all "dangerous" messages
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extern bool WXDLLEXPORT wxIsWaitingForThread();
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#else // !MSW && !PM
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// implement wxCriticalSection using mutexes
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inline wxCriticalSection::wxCriticalSection() { }
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inline wxCriticalSection::~wxCriticalSection() { }
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inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
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inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
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#endif // MSW/!MSW
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// we can define these inline functions now (they should be defined after
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// wxCriticalSection::Enter/Leave)
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inline
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wxCriticalSectionLocker:: wxCriticalSectionLocker(wxCriticalSection& cs)
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: m_critsect(cs) { m_critsect.Enter(); }
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inline
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wxCriticalSectionLocker::~wxCriticalSectionLocker() { m_critsect.Leave(); }
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#endif // wxUSE_THREADS
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#endif // __THREADH__
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