Line data    Source code

       1             : /* src/threads/atomic.hpp - atomic instructions
       2             : 
       3             :    Copyright (C) 2008
       4             :    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
       5             : 
       6             :    This file is part of CACAO.
       7             : 
       8             :    This program is free software; you can redistribute it and/or
       9             :    modify it under the terms of the GNU General Public License as
      10             :    published by the Free Software Foundation; either version 2, or (at
      11             :    your option) any later version.
      12             : 
      13             :    This program is distributed in the hope that it will be useful, but
      14             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :    General Public License for more details.
      17             : 
      18             :    You should have received a copy of the GNU General Public License
      19             :    along with this program; if not, write to the Free Software
      20             :    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
      21             :    02110-1301, USA.
      22             : 
      23             : */
      24             : 
      25             : 
      26             : #ifndef _ATOMIC_HPP
      27             : #define _ATOMIC_HPP
      28             : 
      29             : #include "config.h"
      30             : 
      31             : #include <stdint.h>
      32             : 
      33             : namespace Atomic_md {
      34             :         // Machine dependent functions.
      35             :         uint32_t compare_and_swap(volatile uint32_t *p, uint32_t oldval, uint32_t newval);
      36             :         uint64_t compare_and_swap(volatile uint64_t *p, uint64_t oldval, uint64_t newval);
      37             : 
      38             :         void     memory_barrier(void);
      39             :         void     write_memory_barrier(void);
      40             :         void     instruction_barrier(void);
      41             : }
      42             : 
      43             : namespace Atomic {
      44             : 
      45             :         // Generic functions.
      46             :         uint32_t generic_compare_and_swap(volatile uint32_t *p, uint32_t oldval, uint32_t newval);
      47             :         uint64_t generic_compare_and_swap(volatile uint64_t *p, uint64_t oldval, uint64_t newval);
      48             :         void*    generic_compare_and_swap(volatile void** p, void* oldval, void* newval);
      49             :         void     generic_memory_barrier(void);
      50             : 
      51             : }
      52             : 
      53             : // Include machine dependent implementation.
      54             : #include "md-atomic.hpp"
      55             : 
      56             : namespace Atomic {
      57             : 
      58             :         struct CAS_32_functor {
      59             :                 typedef uint32_t value_type;
      60          33 :                 static value_type compare_and_swap(value_type *p, value_type o, value_type n) {
      61          33 :                         return Atomic_md::compare_and_swap(p, o, n);
      62             :                 }
      63             :         };
      64             : 
      65             :         struct CAS_64_functor {
      66             :                 typedef uint64_t value_type;
      67     1417233 :                 static value_type compare_and_swap(value_type *p, value_type o, value_type n) {
      68     1417233 :                         return Atomic_md::compare_and_swap(p, o, n);
      69             :                 }
      70             :         };
      71             : 
      72             :         template<int N> class CAS_chooser;
      73             :         template<> class CAS_chooser<4> {
      74             :                 public:
      75             :                         typedef CAS_32_functor the_type;
      76             :         };
      77             :         template<> class CAS_chooser<8> {
      78             :                 public:
      79             :                         typedef CAS_64_functor the_type;
      80             :         };
      81             : 
      82             :         template<class T> class CAS {
      83             :                 public:
      84             :                         typedef typename CAS_chooser<sizeof(T)>::the_type S;
      85     1417266 :                         static T compare_and_swap(T *p, T o, T n) {
      86             :                                 return (T) S::compare_and_swap((typename S::value_type*) p,
      87             :                                                 (typename S::value_type) o,
      88     1417266 :                                                 (typename S::value_type) n);
      89             :                         }
      90             :         };
      91             : 
      92     1417265 :         template<class T> T compare_and_swap(T *p, T o, T n) {
      93     1417265 :                 return CAS<T>::compare_and_swap(p, o, n);
      94             :         }
      95             : 
      96     1215125 :         inline void     memory_barrier(void)       { Atomic_md::memory_barrier(); }
      97     1241147 :         inline void     write_memory_barrier(void) { Atomic_md::write_memory_barrier(); }
      98     1235162 :         inline void     instruction_barrier(void)  { Atomic_md::instruction_barrier(); }
      99             : }
     100             : 
     101             : #endif // _ATOMIC_HPP
     102             : 
     103             : 
     104             : /*
     105             :  * These are local overrides for various environment variables in Emacs.
     106             :  * Please do not remove this and leave it at the end of the file, where
     107             :  * Emacs will automagically detect them.
     108             :  * ---------------------------------------------------------------------
     109             :  * Local variables:
     110             :  * mode: c++
     111             :  * indent-tabs-mode: t
     112             :  * c-basic-offset: 4
     113             :  * tab-width: 4
     114             :  * End:
     115             :  * vim:noexpandtab:sw=4:ts=4:
     116             :  */