SBtrdMutex.hpp
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上传日期:2022-05-21
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xml/soap/webservice
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Visual C++
- /* SBtrdMutex, classes for managing various types of mutexes */
- /****************License************************************************
- * Vocalocity OpenVXI
- * Copyright (C) 2004-2005 by Vocalocity, Inc. All Rights Reserved.
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- * Vocalocity, the Vocalocity logo, and VocalOS are trademarks or
- * registered trademarks of Vocalocity, Inc.
- * OpenVXI is a trademark of Scansoft, Inc. and used under license
- * by Vocalocity.
- ***********************************************************************/
- // -----1=0-------2=0-------3=0-------4=0-------5=0-------6=0-------7=0-------8
- #ifndef _SBTRD_MUTEX_H__
- #define _SBTRD_MUTEX_H__
- #include "VXIheaderPrefix.h" // For SYMBOL_EXPORT_CPP_DECL
- #include "VXItrd.h" // For return codes
- #include <cwchar>
- #ifdef SBTRDUTIL_EXPORTS
- #define SBTRDUTIL_API_CLASS SYMBOL_EXPORT_CPP_CLASS_DECL
- #else
- #define SBTRDUTIL_API_CLASS SYMBOL_IMPORT_CPP_CLASS_DECL
- #endif
- extern "C" struct VXIlogInterface;
- // Basic mutex class, simple wrapper around VXItrdMutex where each
- // mutex that gets created points at a different underlying mutex
- class SBTRDUTIL_API_CLASS SBtrdMutex {
- public:
- // Constructor and destructor
- SBtrdMutex ( ) : _name(0), _mutex(0) { }
- virtual ~SBtrdMutex( );
- // Creation method, the name is simply for logging purposes
- virtual VXItrdResult Create (const wchar_t *name);
- // Provide access to the name for logging purposes
- const wchar_t *GetName( ) { return _name; }
- // Lock and unlock the mutex. Declared as const so that users can
- // lock/unlock for read access within const methods.
- virtual VXItrdResult Lock( ) const;
- virtual VXItrdResult Unlock( ) const;
- private:
- // Disable the copy constructor and equality operator to catch making
- // copies at compile or link time, neither is really implemented
- SBtrdMutex (const SBtrdMutex &);
- SBtrdMutex & operator= (const SBtrdMutex &);
- private:
- wchar_t *_name;
- VXItrdMutex *_mutex;
- };
- // Reader/writer mutex class, mutex class that permits any number of
- // readers and no writers, or one writer with no readers, with a
- // strong writer preference to prevent starvation. This is implemented
- // using the classic algorithm, see
- // http://faculty.juniata.edu/rhodes/os/ch5d.htm
- class SBTRDUTIL_API_CLASS SBtrdReaderWriterMutex : public SBtrdMutex {
- public:
- // Constructor and destructor
- SBtrdReaderWriterMutex(VXIlogInterface *log = NULL,
- VXIunsigned diagTagBase = 0) :
- SBtrdMutex( ), _diagTagBase(diagTagBase), _log(log), _readerCount(0),
- _writerCount(0), _readerMutex( ), _writerMutex( ), _readerCountMutex( ),
- _writerCountMutex( ) { }
- virtual ~SBtrdReaderWriterMutex( ) { }
- // Creation method, the name is simply for logging purposes
- virtual VXItrdResult Create (const wchar_t *name);
- // Obtain/release write access
- virtual VXItrdResult Lock( ) const;
- virtual VXItrdResult Unlock( ) const;
- // Obtain/release read access. Declared as const so that users can
- // lock/unlock for read access within const methods.
- VXItrdResult StartRead( ) const;
- VXItrdResult EndRead( ) const;
- private:
- // Error logging
- void Error (VXIunsigned errorID, const VXIchar *format, ...) const;
- // Diagnostic logging
- void Diag (VXIunsigned tag, const VXIchar *subtag,
- const VXIchar *format, ...) const;
- // Disable the copy constructor and equality operator to catch making
- // copies at compile or link time, neither is really implemented
- SBtrdReaderWriterMutex (const SBtrdReaderWriterMutex &);
- SBtrdReaderWriterMutex & operator= (const SBtrdReaderWriterMutex &);
- private:
- // Internal class that provides a mutex which can be locked by one
- // thread, unlocked by another, and if locked by one thread and that
- // same thread comes back and locks it again, that thread will wait
- // (behave like any other thread that does a double lock). The
- // entire algorithm of the reader/writer mutex requires this
- // independance.
- class SBTRDUTIL_API_CLASS CrossThreadMutex : public SBtrdMutex {
- public:
- // Constructor and destructor
- CrossThreadMutex( ) : SBtrdMutex( ), _locked(false), _timer(NULL) {}
- virtual ~CrossThreadMutex( ) {
- if (_timer) VXItrdTimerDestroy (&_timer); }
- // Creation method, the name is simply for logging purposes
- virtual VXItrdResult Create (const wchar_t *name);
- // Obtain/release write access
- virtual VXItrdResult Lock( ) const;
- virtual VXItrdResult Unlock( ) const;
- private:
- volatile bool _locked;
- VXItrdTimer *_timer;
- };
- private:
- VXIunsigned _diagTagBase;
- VXIlogInterface *_log;
- unsigned long _readerCount, _writerCount;
- CrossThreadMutex _readerMutex, _writerMutex;
- SBtrdMutex _readerCountMutex, _writerCountMutex;
- };
- // Mutex pool mutex class, manages a mutex pool of a specified size
- // where you can then request mutexes out of the pool (allocated in a
- // round robin fashion) for shared use by multiple data instances.
- class SBTRDUTIL_API_CLASS SBtrdMutexPool {
- public:
- // Constructor and destructor
- SBtrdMutexPool( ) : _size(0), _curIndex(0), _pool(NULL) { }
- ~SBtrdMutexPool( ) { if ( _pool ) delete [] _pool; }
- // Creation method, the name is simply for logging purposes
- VXItrdResult Create (const wchar_t *name, unsigned int size = 50);
- // Obtain a mutex out of the pool, the mutex pool continues to own
- // this mutex so you must not destroy it, and this mutex may be
- // returned multiple times. This is thread safe.
- SBtrdMutex *GetMutex( );
- private:
- // Disable the copy constructor and equality operator to catch making
- // copies at compile or link time, neither is really implemented
- SBtrdMutexPool (const SBtrdMutexPool &);
- SBtrdMutexPool & operator= (const SBtrdMutexPool &);
- private:
- unsigned int _size;
- unsigned int _curIndex;
- SBtrdMutex *_pool;
- };
- // Reader/writer mutex pool class
- class SBTRDUTIL_API_CLASS SBtrdReaderWriterMutexPool {
- public:
- // Constructor and destructor
- SBtrdReaderWriterMutexPool( ) : _size(0), _curIndex(0),
- _allocationMutex(NULL), _pool(NULL) { }
- ~SBtrdReaderWriterMutexPool( ) {
- if ( _allocationMutex ) delete _allocationMutex;
- if ( _pool ) delete [] _pool; }
- // Creation method, the name is simply for logging purposes
- VXItrdResult Create (const wchar_t *name, unsigned int size = 50);
- // Obtain a mutex out of the pool, the mutex pool continues to own
- // this mutex so you must not destroy it, and this mutex may be
- // returned multiple times. This is thread safe.
- SBtrdReaderWriterMutex *GetMutex( );
- private:
- // Disable the copy constructor and equality operator to catch making
- // copies at compile or link time, neither is really implemented
- SBtrdReaderWriterMutexPool (const SBtrdReaderWriterMutexPool &);
- SBtrdReaderWriterMutexPool & operator= (const SBtrdReaderWriterMutexPool &);
- private:
- unsigned int _size;
- unsigned int _curIndex;
- SBtrdMutex *_allocationMutex;
- SBtrdReaderWriterMutex *_pool;
- };
- #include "VXIheaderSuffix.h"
- #endif // _SBTRD_MUTEX_H__