1998-05-21 11:02:02 -04:00
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/////////////////////////////////////////////////////////////////////////////
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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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1999-01-17 17:39:58 -05:00
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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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1998-05-21 11:02:02 -04:00
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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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1998-08-18 13:22:15 -04:00
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#ifndef __THREADH__
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#define __THREADH__
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1998-05-21 11:02:02 -04:00
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1999-01-04 22:04:48 -05:00
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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1999-01-17 17:39:58 -05:00
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// get the value of wxUSE_THREADS configuration flag
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1998-05-21 11:02:02 -04:00
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#include "wx/setup.h"
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1999-01-04 22:04:48 -05:00
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#if wxUSE_THREADS
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1999-03-11 05:37:09 -05:00
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/* otherwise we get undefined references for non-thread case (KB)*/
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#ifdef __GNUG__
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#pragma interface "thread.h"
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#endif
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1999-01-17 17:39:58 -05:00
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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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1999-01-02 17:24:41 -05:00
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#include "wx/module.h"
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1998-05-21 11:02:02 -04:00
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1998-12-26 19:54:53 -05:00
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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1999-01-17 17:39:58 -05:00
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typedef enum
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1999-01-02 17:24:41 -05:00
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{
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1998-12-26 19:54:53 -05:00
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wxMUTEX_NO_ERROR = 0,
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1999-01-17 17:39:58 -05:00
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wxMUTEX_DEAD_LOCK, // Mutex has been already locked by THE CALLING thread
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1998-12-26 19:54:53 -05:00
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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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1998-05-21 11:02:02 -04:00
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} wxMutexError;
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1999-01-17 17:39:58 -05:00
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typedef enum
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1999-01-02 17:24:41 -05:00
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{
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1998-12-26 19:54:53 -05:00
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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_MISC_ERROR // Some other error
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1998-05-21 11:02:02 -04:00
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} wxThreadError;
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1999-01-17 17:39:58 -05:00
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// defines the interval of priority
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#define WXTHREAD_MIN_PRIORITY 0u
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#define WXTHREAD_DEFAULT_PRIORITY 50u
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#define WXTHREAD_MAX_PRIORITY 100u
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1998-05-21 11:02:02 -04:00
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1999-01-02 17:24:41 -05:00
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// ----------------------------------------------------------------------------
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1999-01-04 22:04:48 -05:00
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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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1998-12-26 19:54:53 -05:00
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// ----------------------------------------------------------------------------
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1999-01-02 17:24:41 -05:00
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1999-01-04 22:04:48 -05:00
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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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1998-08-18 13:22:15 -04:00
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class WXDLLEXPORT wxMutexInternal;
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1999-01-17 17:39:58 -05:00
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class WXDLLEXPORT wxMutex
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1999-01-02 17:24:41 -05:00
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{
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1998-05-21 11:02:02 -04:00
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public:
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1999-01-17 17:39:58 -05:00
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// constructor & destructor
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1999-01-09 19:04:07 -05:00
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wxMutex();
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~wxMutex();
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1998-05-21 11:02:02 -04:00
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1999-01-09 19:04:07 -05:00
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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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1998-05-21 11:02:02 -04:00
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1999-01-09 19:04:07 -05:00
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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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1998-12-26 19:54:53 -05:00
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1998-05-21 11:02:02 -04:00
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protected:
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1999-01-09 19:04:07 -05:00
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friend class wxCondition;
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1998-05-21 11:02:02 -04:00
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1999-01-09 19:04:07 -05:00
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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 *p_internal;
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1998-05-21 11:02:02 -04:00
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};
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1999-01-04 22:04:48 -05:00
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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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1999-01-22 11:21:24 -05:00
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wxMutexLocker(wxMutex& mutex) : m_mutex(mutex)
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{ m_isOk = m_mutex.Lock() == wxMUTEX_NO_ERROR; }
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1999-01-04 22:04:48 -05:00
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// returns TRUE if mutex was successfully locked in ctor
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1999-01-22 11:21:24 -05:00
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bool IsOk() const
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{ return m_isOk; }
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1999-01-04 22:04:48 -05:00
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// unlock the mutex in dtor
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1999-01-22 11:21:24 -05:00
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~wxMutexLocker()
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{ if ( IsOk() ) m_mutex.Unlock(); }
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1999-01-04 22:04:48 -05:00
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private:
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1999-01-09 19:04:07 -05:00
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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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1999-01-04 22:04:48 -05:00
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bool m_isOk;
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1999-01-22 11:21:24 -05:00
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wxMutex& m_mutex;
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1999-01-04 22:04:48 -05:00
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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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1999-01-17 17:39:58 -05:00
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// in order to avoid any overhead under !MSW make all wxCriticalSection class
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// functions inline - but this can't be done under MSW
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1999-07-28 00:16:50 -04:00
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#if defined(__WXMSW__) || defined(__WXPM__)
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1999-01-11 10:51:45 -05:00
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class WXDLLEXPORT wxCriticalSectionInternal;
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#define WXCRITICAL_INLINE
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#else // !MSW
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#define WXCRITICAL_INLINE inline
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#endif // MSW/!MSW
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1999-01-17 17:39:58 -05:00
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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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1999-01-04 22:04:48 -05:00
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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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1999-01-11 10:51:45 -05:00
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WXCRITICAL_INLINE wxCriticalSection();
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WXCRITICAL_INLINE ~wxCriticalSection();
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1999-01-04 22:04:48 -05:00
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// enter the section (the same as locking a mutex)
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1999-03-05 11:24:07 -05:00
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WXCRITICAL_INLINE void Enter();
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1999-01-04 22:04:48 -05:00
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// leave the critical section (same as unlocking a mutex)
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1999-03-05 11:24:07 -05:00
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WXCRITICAL_INLINE void Leave();
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1999-01-04 22:04:48 -05:00
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private:
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1999-01-09 19:04:07 -05:00
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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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1999-07-27 23:38:12 -04:00
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#if defined(__WXMSW__) || defined(__WXPM__)
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1999-01-04 22:04:48 -05:00
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wxCriticalSectionInternal *m_critsect;
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1999-01-11 10:51:45 -05:00
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#else // !MSW
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wxMutex m_mutex;
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#endif // MSW/!MSW
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1999-01-04 22:04:48 -05:00
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};
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1999-01-17 17:39:58 -05:00
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// keep your preprocessor name space clean
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#undef WXCRITICAL_INLINE
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1999-01-04 22:04:48 -05:00
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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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1999-01-08 19:28:27 -05:00
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wxCriticalSectionLocker(wxCriticalSection& critsect) : m_critsect(critsect)
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{ m_critsect.Enter(); }
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1999-01-04 22:04:48 -05:00
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~wxCriticalSectionLocker()
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1999-01-08 19:28:27 -05:00
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{ m_critsect.Leave(); }
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1999-01-04 22:04:48 -05:00
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private:
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1999-01-09 19:04:07 -05:00
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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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1999-01-08 19:28:27 -05:00
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wxCriticalSection& m_critsect;
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1999-01-04 22:04:48 -05:00
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};
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1998-12-26 19:54:53 -05:00
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// ----------------------------------------------------------------------------
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1998-05-21 11:02:02 -04:00
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// Condition handler.
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1998-12-26 19:54:53 -05:00
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// ----------------------------------------------------------------------------
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1999-01-02 17:24:41 -05:00
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1998-05-21 11:02:02 -04:00
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class wxConditionInternal;
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1999-01-17 17:39:58 -05:00
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class WXDLLEXPORT wxCondition
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1999-01-02 17:24:41 -05:00
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{
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1998-05-21 11:02:02 -04:00
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public:
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// constructor & destructor
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1998-06-14 08:15:13 -04:00
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wxCondition();
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~wxCondition();
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1998-05-21 11:02:02 -04:00
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1998-06-14 08:15:13 -04:00
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// Waits indefinitely.
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1998-05-21 11:02:02 -04:00
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void Wait(wxMutex& mutex);
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// Waits until a signal is raised or the timeout is elapsed.
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bool Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec);
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// Raises a signal: only one "Waiter" is released.
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1998-06-14 08:15:13 -04:00
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void Signal();
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1998-05-21 11:02:02 -04:00
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// Broadcasts to all "Waiters".
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1998-06-14 08:15:13 -04:00
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void Broadcast();
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1998-12-26 19:54:53 -05:00
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1998-05-21 11:02:02 -04:00
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private:
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wxConditionInternal *p_internal;
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};
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1998-12-26 19:54:53 -05:00
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// ----------------------------------------------------------------------------
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1998-05-21 11:02:02 -04:00
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// Thread management class
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1998-12-26 19:54:53 -05:00
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// ----------------------------------------------------------------------------
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1999-01-02 17:24:41 -05:00
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1999-01-17 17:39:58 -05:00
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// FIXME Thread termination model is still unclear. Delete() should probably
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// have a timeout after which the thread must be Kill()ed.
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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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1998-05-21 11:02:02 -04:00
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class wxThreadInternal;
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1999-01-17 17:39:58 -05:00
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class WXDLLEXPORT wxThread
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1999-01-02 17:24:41 -05:00
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{
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1998-05-21 11:02:02 -04:00
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public:
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1999-01-17 17:39:58 -05:00
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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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// default constructor
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wxThread();
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// function that change the thread state
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// create a new thread - call Run() to start it
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wxThreadError Create();
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// starts execution of the thread - from the moment Run() is called the
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// 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
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// freeing its memory. This function should also be called if the
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// Create() or Run() fails to free memory (otherwise it will be done by
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// the thread itself when it terminates). The return value is the
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// thread exit code if the thread was gracefully terminated, 0 if it
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// wasn't running and -1 if an error occured.
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ExitCode Delete();
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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! The wxThread object is deleted by Kill() if thread was
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// killed (i.e. no errors occured).
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wxThreadError Kill();
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// pause a running thread
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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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// Get the thread ID - a platform dependent number which uniquely
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// identifies a thread inside a process
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unsigned long GetID() 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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1999-04-26 14:16:56 -04:00
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bool IsPaused() const;
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1999-01-17 17:39:58 -05:00
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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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1998-05-21 11:02:02 -04:00
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1999-01-17 17:39:58 -05:00
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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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1999-01-22 13:35:42 -05:00
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bool TestDestroy();
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1998-05-21 11:02:02 -04:00
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1999-01-17 17:39:58 -05:00
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// exits from the current thread - can be called only from this thread
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void Exit(void *exitcode = 0);
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1998-08-18 13:22:15 -04:00
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1999-01-17 17:39:58 -05:00
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// destructor is private - user code can't delete thread objects, they will
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// auto-delete themselves (and thus must be always allocated on the heap).
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// Use Delete() or Kill() instead.
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//
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// NB: derived classes dtors shouldn't be public neither!
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virtual ~wxThread();
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1999-01-04 22:04:48 -05:00
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1999-01-17 17:39:58 -05:00
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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;
|
1998-12-26 19:54:53 -05:00
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1998-05-21 11:02:02 -04:00
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private:
|
1999-01-17 17:39:58 -05:00
|
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// no copy ctor/assignment operator
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wxThread(const wxThread&);
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wxThread& operator=(const wxThread&);
|
1998-05-21 11:02:02 -04:00
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1999-01-17 17:39:58 -05:00
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friend class wxThreadInternal;
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// the (platform-dependent) thread class implementation
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wxThreadInternal *p_internal;
|
1998-05-21 11:02:02 -04:00
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1999-01-17 17:39:58 -05:00
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// protects access to any methods of wxThreadInternal object
|
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|
|
wxCriticalSection m_critsect;
|
1998-05-21 11:02:02 -04:00
|
|
|
};
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|
1998-12-26 19:54:53 -05:00
|
|
|
// ----------------------------------------------------------------------------
|
1999-01-02 17:24:41 -05:00
|
|
|
// Automatic initialization
|
1998-12-26 19:54:53 -05:00
|
|
|
// ----------------------------------------------------------------------------
|
1998-05-21 11:02:02 -04:00
|
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|
1999-01-04 22:04:48 -05:00
|
|
|
// GUI mutex handling.
|
|
|
|
void WXDLLEXPORT wxMutexGuiEnter();
|
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|
|
void WXDLLEXPORT wxMutexGuiLeave();
|
1999-01-02 17:24:41 -05:00
|
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|
1999-01-04 22:04:48 -05:00
|
|
|
#else // !wxUSE_THREADS
|
1999-01-02 17:24:41 -05:00
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|
1999-08-20 18:52:21 -04:00
|
|
|
#include "wx/defs.h" // for WXDLLEXPORT
|
1999-03-05 19:11:27 -05:00
|
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|
1999-01-04 22:04:48 -05:00
|
|
|
// no thread support
|
|
|
|
inline void WXDLLEXPORT wxMutexGuiEnter() { }
|
|
|
|
inline void WXDLLEXPORT wxMutexGuiLeave() { }
|
1999-01-02 17:24:41 -05:00
|
|
|
|
1999-01-04 22:04:48 -05:00
|
|
|
#endif // wxUSE_THREADS
|
1998-05-21 11:02:02 -04:00
|
|
|
|
1999-01-08 19:28:27 -05:00
|
|
|
// automatically unlock GUI mutex in dtor
|
|
|
|
class WXDLLEXPORT wxMutexGuiLocker
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
wxMutexGuiLocker() { wxMutexGuiEnter(); }
|
|
|
|
~wxMutexGuiLocker() { wxMutexGuiLeave(); }
|
|
|
|
};
|
|
|
|
|
1999-01-11 10:51:45 -05:00
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// implementation only until the end of file
|
|
|
|
// -----------------------------------------------------------------------------
|
1999-01-24 09:57:09 -05:00
|
|
|
#if wxUSE_THREADS
|
1999-07-27 23:38:12 -04:00
|
|
|
#if defined(__WXMSW__) || defined(__WXPM__)
|
1999-01-11 10:51:45 -05:00
|
|
|
// 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
|
1999-01-12 18:39:07 -05:00
|
|
|
extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
|
1999-01-11 10:51:45 -05:00
|
|
|
|
|
|
|
// returns TRUE if the main thread has GUI lock
|
1999-01-12 18:39:07 -05:00
|
|
|
extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
|
1999-01-11 10:51:45 -05:00
|
|
|
|
|
|
|
// wakes up the main thread if it's sleeping inside ::GetMessage()
|
1999-01-12 18:39:07 -05:00
|
|
|
extern void WXDLLEXPORT wxWakeUpMainThread();
|
1999-01-17 17:39:58 -05:00
|
|
|
|
|
|
|
// return TRUE if the main thread is waiting for some other to terminate:
|
|
|
|
// wxApp then should block all "dangerous" messages
|
|
|
|
extern bool WXDLLEXPORT wxIsWaitingForThread();
|
1999-01-11 10:51:45 -05:00
|
|
|
#else // !MSW
|
|
|
|
// implement wxCriticalSection using mutexes
|
|
|
|
inline wxCriticalSection::wxCriticalSection() { }
|
|
|
|
inline wxCriticalSection::~wxCriticalSection() { }
|
|
|
|
|
|
|
|
inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
|
|
|
|
inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
|
|
|
|
#endif // MSW/!MSW
|
|
|
|
#endif // wxUSE_THREADS
|
|
|
|
|
1998-12-26 19:54:53 -05:00
|
|
|
#endif // __THREADH__
|