Panda3D
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00001 // Filename: conditionVarSpinlockImpl.h 00002 // Created by: drose (11Apr06) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) Carnegie Mellon University. All rights reserved. 00008 // 00009 // All use of this software is subject to the terms of the revised BSD 00010 // license. You should have received a copy of this license along 00011 // with this source code in a file named "LICENSE." 00012 // 00013 //////////////////////////////////////////////////////////////////// 00014 00015 #ifndef CONDITIONVARSPINLOCKIMPL_H 00016 #define CONDITIONVARSPINLOCKIMPL_H 00017 00018 #include "pandabase.h" 00019 #include "selectThreadImpl.h" 00020 00021 #ifdef MUTEX_SPINLOCK 00022 00023 #include "mutexSpinlockImpl.h" 00024 #include "pnotify.h" 00025 #include "atomicAdjust.h" 00026 00027 class MutexSpinlockImpl; 00028 00029 //////////////////////////////////////////////////////////////////// 00030 // Class : ConditionVarSpinlockImpl 00031 // Description : Uses a simple user-space spinlock to implement a 00032 // condition variable. It is usually not a good idea to 00033 // use this implementation, unless you are building 00034 // Panda for a specific application on a specific SMP 00035 // machine, and you are confident that you have at least 00036 // as many CPU's as you have threads. 00037 //////////////////////////////////////////////////////////////////// 00038 class EXPCL_PANDA_PIPELINE ConditionVarSpinlockImpl { 00039 public: 00040 INLINE ConditionVarSpinlockImpl(MutexSpinlockImpl &mutex); 00041 INLINE ~ConditionVarSpinlockImpl(); 00042 00043 void wait(); 00044 INLINE void notify(); 00045 INLINE void notify_all(); 00046 00047 private: 00048 MutexSpinlockImpl &_mutex; 00049 TVOLATILE AtomicAdjust::Integer _event; 00050 }; 00051 00052 #include "conditionVarSpinlockImpl.I" 00053 00054 #endif // MUTEX_SPINLOCK 00055 00056 #endif