LoUpdateLock.C

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