Panda3D
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blockerSimple.h
00001 // Filename: blockerSimple.h
00002 // Created by:  drose (20Jun07)
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 BLOCKERSIMPLE_H
00016 #define BLOCKERSIMPLE_H
00017 
00018 #include "pandabase.h"
00019 #include "selectThreadImpl.h"
00020 
00021 #ifdef THREAD_SIMPLE_IMPL
00022 
00023 #include "pnotify.h"
00024 
00025 ////////////////////////////////////////////////////////////////////
00026 //       Class : BlockerSimple
00027 // Description : This is a base class for MutexSimpleImpl and
00028 //               ConditionVarSimpleImpl.  It represents a
00029 //               synchronization primitive that one or more threads
00030 //               might be blocked on.
00031 ////////////////////////////////////////////////////////////////////
00032 class EXPCL_PANDA_PIPELINE BlockerSimple {
00033 protected:
00034   INLINE BlockerSimple();
00035   INLINE ~BlockerSimple();
00036 
00037 protected:
00038   enum Flags {
00039     // lock_count is only used for mutexes, not condition variables.
00040     F_lock_count   = 0x3fffffff,
00041     F_has_waiters  = 0x40000000,
00042   };
00043 
00044   unsigned int _flags;
00045 
00046   friend class ThreadSimpleManager;
00047 };
00048 
00049 #include "blockerSimple.I"
00050 
00051 #endif  // THREAD_SIMPLE_IMPL
00052 
00053 #endif
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