GroovX: src/rutz/atomic_darwin.h Source File

00001 
00003 
00004 //
00005 // Copyright (c) 2006-2007 University of Southern California
00006 // Rob Peters <rjpeters at usc dot edu>
00007 //
00008 // created: Thu Oct  5 10:55:50 2006
00009 // commit: $Id: atomic_darwin.h 10065 2007-04-12 05:54:56Z rjpeters $
00010 // $HeadURL: file:///lab/rjpeters/svnrepo/code/trunk/groovx/src/rutz/atomic_darwin.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_DARWIN_H_UTC20070412044456_DEFINED
00034 #define GROOVX_RUTZ_ATOMIC_DARWIN_H_UTC20070412044456_DEFINED
00035 
00036 #include <libkern/OSAtomic.h>
00037 #include <limits>
00038 
00039 namespace rutz
00040 {
00041 
00043 class darwin_atomic_int
00044 {
00045 private:
00046   int32_t x;
00047 
00048   darwin_atomic_int(const darwin_atomic_int&);
00049   darwin_atomic_int& operator=(const darwin_atomic_int&);
00050 
00051 public:
00053   darwin_atomic_int() : x(0) {}
00054 
00056   static int max_value() { return std::numeric_limits<int32_t>::max(); }
00057 
00059   int atomic_get() const
00060   { return x; }
00061 
00063   void atomic_set(int v)
00064   { x = v; }
00065 
00067   void atomic_add(int i)
00068   { OSAtomicAdd32Barrier(i, &x); }
00069 
00071   void atomic_sub(int i)
00072   { OSAtomicAdd32Barrier(-i, &x); }
00073 
00075   bool atomic_sub_test_zero(int i)
00076   { return (OSAtomicAdd32Barrier(-i, &x) == 0); }
00077 
00079   void atomic_incr()
00080   { OSAtomicAdd32Barrier(1, &x); }
00081 
00083   void atomic_decr()
00084   { OSAtomicAdd32Barrier(-1, &x); }
00085 
00087   bool atomic_decr_test_zero()
00088   { return (OSAtomicAdd32Barrier(-1, &x) == 0); }
00089 
00091   bool atomic_incr_test_zero()
00092   { return (OSAtomicAdd32Barrier(1, &x) == 0); }
00093 
00095   int atomic_add_return(int i)
00096   { return OSAtomicAdd32Barrier(i, &x); }
00097 
00099   int atomic_sub_return(int i)
00100   { return OSAtomicAdd32Barrier(-i, &x); }
00101 
00103   int atomic_incr_return()
00104   { return OSAtomicAdd32Barrier(1, &x); }
00105 
00107   int atomic_decr_return()
00108   { return OSAtomicAdd32Barrier(-1, &x); }
00109 };
00110 
00111 } // end namespace rutz
00112 
00113 // ######################################################################
00114 /* So things look consistent in everyone's emacs... */
00115 /* Local Variables: */
00116 /* mode: c++ */
00117 /* indent-tabs-mode: nil */
00118 /* End: */
00119 
00120 static const char __attribute__((used)) vcid_groovx_rutz_atomic_darwin_h_utc20070412044456[] = "$Id: atomic_darwin.h 10065 2007-04-12 05:54:56Z rjpeters $ $HeadURL: file:
00121 #endif // !GROOVX_RUTZ_ATOMIC_DARWIN_H_UTC20070412044456DEFINED