CLAM-Development
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00001 /* 00002 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG) 00003 * UNIVERSITAT POMPEU FABRA 00004 * 00005 * 00006 * This program is free software; you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation; either version 2 of the License, or 00009 * (at your option) any later version. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with this program; if not, write to the Free Software 00018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00019 * 00020 */ 00021 00022 #ifndef __CONDITION__ 00023 #define __CONDITION__ 00024 00025 #include "ErrSystem.hxx" 00026 #include "Lock.hxx" 00027 #include <pthread.h> 00028 00029 namespace CLAM 00030 { 00031 00032 struct xtime; 00033 00034 class Condition 00035 { 00036 public: 00037 Condition(); 00038 ~Condition(); 00039 00040 void NotifyOne(); 00041 void NotifyAll(); 00042 00043 template <typename L> 00044 void Wait( L& lock ) 00045 { 00046 if ( !lock ) 00047 throw LockError("Invalid lock"); 00048 00049 DoWait( lock.mMutex ); 00050 } 00051 00052 template <typename L, typename Pr > 00053 void Wait( L& lock, Pr predicate ) 00054 { 00055 if ( !lock ) 00056 throw LockError("Invalid lock"); 00057 00058 while ( !predicate() ) 00059 DoWait( lock.mMutex ); 00060 } 00061 00062 template <typename L> 00063 bool TimedWait( L& lock, const xtime& xt ) 00064 { 00065 if (!lock ) 00066 throw LockError(); 00067 00068 return DoTimedWait( lock.mMutex, xt ); 00069 } 00070 00071 template <typename L, typename Pr> 00072 bool TimedWait( L& lock, const xtime& xt, Pr predicate ) 00073 { 00074 if ( !lock ) 00075 throw LockError(); 00076 00077 while( !predicate() ) 00078 { 00079 if (!DoTimedWait( lock.mMutex, xt ) ) 00080 return false; 00081 } 00082 00083 return true; 00084 } 00085 00086 private: 00087 00088 template <typename M> 00089 void DoWait( M& mutex ) 00090 { 00091 typedef typename Hidden::LockOps<M> LockOps; 00092 typename LockOps::LockState state; 00093 00094 LockOps::Unlock( mutex, state ); 00095 DoWait( state.pmutex ); 00096 LockOps::Lock( mutex, state ); 00097 } 00098 00099 template <typename M> 00100 bool DoTimedWait( M& mutex, const xtime& xt ) 00101 { 00102 typedef typename Hidden::LockOps<M> LockOps; 00103 typename LockOps::LockState state; 00104 00105 LockOps::Unlock( mutex, state ); 00106 00107 bool ret = false; 00108 00109 ret = DoTimedWait( xt, state.pmutex ); 00110 00111 LockOps::Lock( mutex, state ); 00112 00113 return ret; 00114 } 00115 00116 void DoWait( pthread_mutex_t* pMutex ); 00117 00118 bool DoTimedWait( const xtime& xt, pthread_mutex_t* pMutex); 00119 00120 pthread_cond_t mCondition; 00121 }; 00122 00123 } // end of namespace CLAM 00124 00125 #endif // Condition.hxx 00126