LoMutex.C

00001 /**
00002    \file  Robots/LoBot/misc/LoMutex.C
00003    \brief This file defines the non-inline member functions of the
00004    lobot::Mutex and lobot::AutoMutex classes.
00005 */
00006 
00007 // //////////////////////////////////////////////////////////////////// //
00008 // The iLab Neuromorphic Vision C++ Toolkit - Copyright (C) 2000-2005   //
00009 // by the University of Southern California (USC) and the iLab at USC.  //
00010 // See http://iLab.usc.edu for information about this project.          //
00011 // //////////////////////////////////////////////////////////////////// //
00012 // Major portions of the iLab Neuromorphic Vision Toolkit are protected //
00013 // under the U.S. patent ``Computation of Intrinsic Perceptual Saliency //
00014 // in Visual Environments, and Applications'' by Christof Koch and      //
00015 // Laurent Itti, California Institute of Technology, 2001 (patent       //
00016 // pending; application number 09/912,225 filed July 23, 2001; see      //
00017 // http://pair.uspto.gov/cgi-bin/final/home.pl for current status).     //
00018 // //////////////////////////////////////////////////////////////////// //
00019 // This file is part of the iLab Neuromorphic Vision C++ Toolkit.       //
00020 //                                                                      //
00021 // The iLab Neuromorphic Vision C++ Toolkit is free software; you can   //
00022 // redistribute it and/or modify it under the terms of the GNU General  //
00023 // Public License as published by the Free Software Foundation; either  //
00024 // version 2 of the License, or (at your option) any later version.     //
00025 //                                                                      //
00026 // The iLab Neuromorphic Vision C++ Toolkit is distributed in the hope  //
00027 // that it will be useful, but WITHOUT ANY WARRANTY; without even the   //
00028 // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      //
00029 // PURPOSE.  See the GNU General Public License for more details.       //
00030 //                                                                      //
00031 // You should have received a copy of the GNU General Public License    //
00032 // along with the iLab Neuromorphic Vision C++ Toolkit; if not, write   //
00033 // to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,   //
00034 // Boston, MA 02111-1307 USA.                                           //
00035 // //////////////////////////////////////////////////////////////////// //
00036 //
00037 // Primary maintainer for this file: mviswana usc edu
00038 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/Robots/LoBot/thread/LoMutex.C $
00039 // $Id: LoMutex.C 13521 2010-06-06 14:23:03Z mviswana $
00040 //
00041 
00042 //---------------------- ALTERNATIVE DEFINITION -------------------------
00043 
00044 // In case pthreads is missing
00045 #ifndef INVT_HAVE_LIBPTHREAD
00046 
00047 #include "Robots/LoBot/thread/LoMutex.H"
00048 #include "Robots/LoBot/misc/LoExcept.H"
00049 
00050 namespace lobot {
00051 
00052 // Constructors
00053 Mutex::Mutex()
00054    : m_mutex(0)
00055 {
00056    throw missing_libs(MISSING_PTHREAD) ;
00057 }
00058 
00059 AutoMutex::AutoMutex(Mutex& m)
00060    : m_mutex(m)
00061 {
00062    throw missing_libs(MISSING_PTHREAD) ;
00063 }
00064 
00065 AutoMutex::AutoMutex(const Mutex& m)
00066    : m_mutex(const_cast<Mutex&>(m))
00067 {
00068    throw missing_libs(MISSING_PTHREAD) ;
00069 }
00070 
00071 // Empty API
00072 void  Mutex::acquire(){}
00073 void  Mutex::release(){}
00074 
00075 // Destructors
00076 Mutex::~Mutex(){}
00077 AutoMutex::~AutoMutex(){}
00078 
00079 } // end of namespace encapsulating above empty definition
00080 
00081 #else // pthreads available ==> the real McCoy
00082 
00083 //------------------------------ HEADERS --------------------------------
00084 
00085 // lobot headers
00086 #include "Robots/LoBot/thread/LoMutex.H"
00087 #include "Robots/LoBot/misc/LoExcept.H"
00088 
00089 //----------------------------- NAMESPACE -------------------------------
00090 
00091 namespace lobot {
00092 
00093 //-------------------------- INITIALIZATION -----------------------------
00094 
00095 Mutex::Mutex()
00096 {
00097    if (pthread_mutex_init(& m_mutex, 0) != 0)
00098       throw thread_error(MUTEX_INIT_ERROR) ;
00099 }
00100 
00101 AutoMutex::AutoMutex(Mutex& m)
00102    : m_mutex(m)
00103 {
00104    m_mutex.acquire() ;
00105 }
00106 
00107 AutoMutex::AutoMutex(const Mutex& m)
00108    : m_mutex(const_cast<Mutex&>(m))
00109 {
00110    m_mutex.acquire() ;
00111 }
00112 
00113 //------------------------- MUTEX OPERATIONS ----------------------------
00114 
00115 void Mutex::acquire()
00116 {
00117    pthread_mutex_lock(& m_mutex) ;
00118 }
00119 
00120 void Mutex::release()
00121 {
00122    pthread_mutex_unlock(& m_mutex) ;
00123 }
00124 
00125 //----------------------------- CLEAN-UP --------------------------------
00126 
00127 Mutex::~Mutex()
00128 {
00129    pthread_mutex_destroy(& m_mutex) ;
00130 }
00131 
00132 AutoMutex::~AutoMutex()
00133 {
00134    m_mutex.release() ;
00135 }
00136 
00137 //-----------------------------------------------------------------------
00138 
00139 } // end of namespace encapsulating this file's definitions
00140 
00141 #endif // INVT_HAVE_PTHREAD
00142 
00143 /* So things look consistent in everyone's emacs... */
00144 /* Local Variables: */
00145 /* indent-tabs-mode: nil */
00146 /* End: */
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