Panda3D

mutexSimpleImpl.h

00001 // Filename: mutexSimpleImpl.h
00002 // Created by:  drose (19Jun07)
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 MUTEXSIMPLEIMPL_H
00016 #define MUTEXSIMPLEIMPL_H
00017 
00018 #include "pandabase.h"
00019 #include "selectThreadImpl.h"
00020 
00021 #ifdef THREAD_SIMPLE_IMPL
00022 
00023 #include "blockerSimple.h"
00024 #include "threadSimpleImpl.h"
00025 
00026 ////////////////////////////////////////////////////////////////////
00027 //       Class : MutexSimpleImpl
00028 // Description : This is the mutex implementation for the simple,
00029 //               simulated threads case.  It's designed to be as
00030 //               lightweight as possible, of course.  This
00031 //               implementation simply yields the thread when the
00032 //               mutex would block.
00033 //
00034 //               We can't define this class in dtoolbase along with
00035 //               the other mutex implementations, because this
00036 //               implementation requires knowing about the
00037 //               SimpleThreadManager.  This complicates the
00038 //               MutexDirect and MutexDebug definitions (we have to
00039 //               define a MutexImpl, for code before pipeline to
00040 //               use--which maps to MutexDummyImpl--and a
00041 //               MutexTrueImpl, for code after pipeline to use--which
00042 //               maps to this class, MutexSimpleImpl).
00043 ////////////////////////////////////////////////////////////////////
00044 class EXPCL_PANDA_PIPELINE MutexSimpleImpl : public BlockerSimple {
00045 public:
00046   INLINE MutexSimpleImpl();
00047   INLINE ~MutexSimpleImpl();
00048 
00049   INLINE void acquire();
00050   INLINE bool try_acquire();
00051   INLINE void release();
00052   INLINE void release_quietly();
00053 
00054 private:
00055   void do_acquire();
00056   void do_release();
00057   void do_release_quietly();
00058 
00059   friend class ThreadSimpleManager;
00060 };
00061 
00062 #include "mutexSimpleImpl.I"
00063 
00064 #endif  // THREAD_SIMPLE_IMPL
00065 
00066 #endif
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