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CriticalSection.h

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00001 //------------------------------------------------------------------------------
00002 // Lamp : Open source game middleware
00003 // Copyright (C) 2004  Junpei Ohtani ( Email : junpee@users.sourceforge.jp )
00004 //
00005 // This library is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU Lesser General Public
00007 // License as published by the Free Software Foundation; either
00008 // version 2.1 of the License, or (at your option) any later version.
00009 //
00010 // This library is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013 // Lesser General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU Lesser General Public
00016 // License along with this library; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018 //------------------------------------------------------------------------------
00019 
00020 /** @file
00021  * クリティカルセクションヘッダ
00022  * @author Junpee
00023  */
00024 
00025 #ifndef CRITICAL_SECTION_H_
00026 #define CRITICAL_SECTION_H_
00027 
00028 #include <Core/Thread/LockObject.h>
00029 
00030 namespace Lamp{
00031 
00032 //------------------------------------------------------------------------------
00033 /**
00034  * クリティカルセクション
00035  */
00036 class CriticalSection : public LockObject{
00037 public:
00038     /**
00039      * コンストラクタ
00040      */
00041     CriticalSection() : lockCount_(0), threadID_(invalidThreadID){
00042         ::InitializeCriticalSection(&criticalSection_);
00043     }
00044 
00045     /**
00046      * デストラクタ
00047      */
00048     virtual ~CriticalSection(){
00049         Assert(threadID_ == invalidThreadID);
00050         Assert(lockCount_ == 0);
00051         ::DeleteCriticalSection(&criticalSection_);
00052     }
00053 
00054     /**
00055      * ロック
00056      */
00057     virtual void lock(){
00058         ::EnterCriticalSection(&criticalSection_);
00059         lockCount_++;
00060         threadID_ = ::GetCurrentThreadId();
00061     }
00062 
00063     /**
00064      * アンロック
00065      */
00066     virtual void unlock(){
00067         Assert(lockCount_ > 0);
00068         lockCount_--;
00069         if(lockCount_ == 0){ threadID_ = invalidThreadID; }
00070         ::LeaveCriticalSection(&criticalSection_);
00071     }
00072 
00073     /**
00074      * カレントスレッドによってロックされているか
00075      * @return カレントスレッドによってロックされていればtrue
00076      */
00077     virtual bool isLockedByCurrentThread() const{
00078         return (::GetCurrentThreadId() == threadID_);
00079     }
00080 
00081 protected:
00082     /// クリティカルセクションメンバ
00083     CRITICAL_SECTION criticalSection_;
00084     /// ロックカウント
00085     int lockCount_;
00086     /// スレッドID
00087     u_int threadID_;
00088 
00089     /// 無効なスレッドID
00090     static const u_int invalidThreadID = 0xffffffff;
00091 
00092 };
00093 
00094 //------------------------------------------------------------------------------
00095 } // End of namespace Lamp
00096 #endif // End of CRITICAL_SECTION_H_
00097 //------------------------------------------------------------------------------

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