00001 00003 00004 // 00005 // Copyright (c) 2006-2007 University of Southern California 00006 // Rob Peters <rjpeters at usc dot edu> 00007 // 00008 // created: Thu Aug 10 16:56:03 2006 00009 // commit: $Id: atomic_unsafe.h 10065 2007-04-12 05:54:56Z rjpeters $ 00010 // $HeadURL: file:///lab/rjpeters/svnrepo/code/trunk/groovx/src/rutz/atomic_unsafe.h $ 00011 // 00012 // -------------------------------------------------------------------- 00013 // 00014 // This file is part of GroovX. 00015 // [http://www.klab.caltech.edu/rjpeters/groovx/] 00016 // 00017 // GroovX is free software; you can redistribute it and/or modify it 00018 // under the terms of the GNU General Public License as published by 00019 // the Free Software Foundation; either version 2 of the License, or 00020 // (at your option) any later version. 00021 // 00022 // GroovX is distributed in the hope that it will be useful, but 00023 // WITHOUT ANY WARRANTY; without even the implied warranty of 00024 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00025 // General Public License for more details. 00026 // 00027 // You should have received a copy of the GNU General Public License 00028 // along with GroovX; if not, write to the Free Software Foundation, 00029 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 00030 // 00032 00033 #ifndef GROOVX_RUTZ_ATOMIC_UNSAFE_H_UTC20070412044712_DEFINED 00034 #define GROOVX_RUTZ_ATOMIC_UNSAFE_H_UTC20070412044712_DEFINED 00035 00036 #include <limits> 00037 00038 namespace rutz 00039 { 00040 00042 class unsafe_atomic_int 00043 { 00044 private: 00045 int x; 00046 00047 unsafe_atomic_int(const unsafe_atomic_int&); 00048 unsafe_atomic_int& operator=(const unsafe_atomic_int&); 00049 00050 public: 00052 unsafe_atomic_int() : x(0) {} 00053 00055 static int max_value() { return std::numeric_limits<int>::max(); } 00056 00058 int atomic_get() const 00059 { return x; } 00060 00062 void atomic_set(int v) 00063 { x = v; } 00064 00066 void atomic_add(int i) 00067 { x += i; } 00068 00070 void atomic_sub(int i) 00071 { x -= i; } 00072 00074 bool atomic_sub_test_zero(int i) 00075 { return bool((x -= i) == 0); } 00076 00078 void atomic_incr() 00079 { ++x; } 00080 00082 void atomic_decr() 00083 { --x; } 00084 00086 bool atomic_decr_test_zero() 00087 { return bool(--x == 0); } 00088 00090 bool atomic_incr_test_zero() 00091 { return bool(++x == 0); } 00092 00094 int atomic_add_return(int i) 00095 { return (x += i); } 00096 00098 int atomic_sub_return(int i) 00099 { return (x -= i); } 00100 00102 int atomic_incr_return() 00103 { return ++x; } 00104 00106 int atomic_decr_return() 00107 { return --x; } 00108 }; 00109 00110 } // end namespace rutz 00111 00112 // ###################################################################### 00113 /* So things look consistent in everyone's emacs... */ 00114 /* Local Variables: */ 00115 /* mode: c++ */ 00116 /* indent-tabs-mode: nil */ 00117 /* End: */ 00118 00119 static const char __attribute__((used)) vcid_groovx_rutz_atomic_unsafe_h_utc20070412044712[] = "$Id: atomic_unsafe.h 10065 2007-04-12 05:54:56Z rjpeters $ $HeadURL: file: 00120 #endif // !GROOVX_RUTZ_ATOMIC_UNSAFE_H_UTC20070412044712DEFINED