LCOV - code coverage report
Current view: directory - tools/gcc-4.5/include/c++/4.5.2/ext - atomicity.h (source / functions) Found Hit Coverage
Test: app.info Lines: 19 0 0.0 %
Date: 2012-06-02 Functions: 6 0 0.0 %

       1                 : // Support for atomic operations -*- C++ -*-
       2                 : 
       3                 : // Copyright (C) 2004, 2005, 2006, 2008, 2009 Free Software Foundation, Inc.
       4                 : //
       5                 : // This file is part of the GNU ISO C++ Library.  This library is free
       6                 : // software; you can redistribute it and/or modify it under the
       7                 : // terms of the GNU General Public License as published by the
       8                 : // Free Software Foundation; either version 3, or (at your option)
       9                 : // any later version.
      10                 : 
      11                 : // This library is distributed in the hope that it will be useful,
      12                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14                 : // GNU General Public License for more details.
      15                 : 
      16                 : // Under Section 7 of GPL version 3, you are granted additional
      17                 : // permissions described in the GCC Runtime Library Exception, version
      18                 : // 3.1, as published by the Free Software Foundation.
      19                 : 
      20                 : // You should have received a copy of the GNU General Public License and
      21                 : // a copy of the GCC Runtime Library Exception along with this program;
      22                 : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23                 : // <http://www.gnu.org/licenses/>.
      24                 : 
      25                 : /** @file atomicity.h
      26                 :  *  This is an internal header file, included by other library headers.
      27                 :  *  You should not attempt to use it directly.
      28                 :  */
      29                 : 
      30                 : #ifndef _GLIBCXX_ATOMICITY_H
      31                 : #define _GLIBCXX_ATOMICITY_H    1
      32                 : 
      33                 : #include <bits/c++config.h>
      34                 : #include <bits/gthr.h>
      35                 : #include <bits/atomic_word.h>
      36                 : 
      37                 : _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
      38                 : 
      39                 :   // Functions for portable atomic access.
      40                 :   // To abstract locking primitives across all thread policies, use:
      41                 :   // __exchange_and_add_dispatch
      42                 :   // __atomic_add_dispatch
      43                 : #ifdef _GLIBCXX_ATOMIC_BUILTINS_4
      44                 :   static inline _Atomic_word 
      45               0 :   __exchange_and_add(volatile _Atomic_word* __mem, int __val)
      46               0 :   { return __sync_fetch_and_add(__mem, __val); }
      47                 : 
      48                 :   static inline void
      49               0 :   __atomic_add(volatile _Atomic_word* __mem, int __val)
      50               0 :   { __sync_fetch_and_add(__mem, __val); }
      51                 : #else
      52                 :   _Atomic_word
      53                 :   __attribute__ ((__unused__))
      54                 :   __exchange_and_add(volatile _Atomic_word*, int) throw ();
      55                 : 
      56                 :   void
      57                 :   __attribute__ ((__unused__))
      58                 :   __atomic_add(volatile _Atomic_word*, int) throw ();
      59                 : #endif
      60                 : 
      61                 :   static inline _Atomic_word
      62               0 :   __exchange_and_add_single(_Atomic_word* __mem, int __val)
      63                 :   {
      64               0 :     _Atomic_word __result = *__mem;
      65               0 :     *__mem += __val;
      66               0 :     return __result;
      67                 :   }
      68                 : 
      69                 :   static inline void
      70               0 :   __atomic_add_single(_Atomic_word* __mem, int __val)
      71               0 :   { *__mem += __val; }
      72                 : 
      73                 :   static inline _Atomic_word
      74                 :   __attribute__ ((__unused__))
      75               0 :   __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
      76                 :   {
      77                 : #ifdef __GTHREADS
      78               0 :     if (__gthread_active_p())
      79               0 :       return __exchange_and_add(__mem, __val);
      80                 :     else
      81               0 :       return __exchange_and_add_single(__mem, __val);
      82                 : #else
      83                 :     return __exchange_and_add_single(__mem, __val);
      84                 : #endif
      85                 :   }
      86                 : 
      87                 :   static inline void
      88                 :   __attribute__ ((__unused__))
      89               0 :   __atomic_add_dispatch(_Atomic_word* __mem, int __val)
      90                 :   {
      91                 : #ifdef __GTHREADS
      92               0 :     if (__gthread_active_p())
      93               0 :       __atomic_add(__mem, __val);
      94                 :     else
      95               0 :       __atomic_add_single(__mem, __val);
      96                 : #else
      97                 :     __atomic_add_single(__mem, __val);
      98                 : #endif
      99               0 :   }
     100                 : 
     101                 : _GLIBCXX_END_NAMESPACE
     102                 : 
     103                 : // Even if the CPU doesn't need a memory barrier, we need to ensure
     104                 : // that the compiler doesn't reorder memory accesses across the
     105                 : // barriers.
     106                 : #ifndef _GLIBCXX_READ_MEM_BARRIER
     107                 : #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
     108                 : #endif
     109                 : #ifndef _GLIBCXX_WRITE_MEM_BARRIER
     110                 : #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
     111                 : #endif
     112                 : 
     113                 : #endif 

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