LCOV - code coverage report
Current view: top level - usr/include/c++/4.8/ext - atomicity.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 10 0.0 %
Date: 2013-07-07 Functions: 0 3 0.0 %
Branches: 0 2 0.0 %

           Branch data     Line data    Source code
       1                 :            : // Support for atomic operations -*- C++ -*-
       2                 :            : 
       3                 :            : // Copyright (C) 2004-2013 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 ext/atomicity.h
      26                 :            :  *  This file is a GNU extension to the Standard C++ Library.
      27                 :            :  */
      28                 :            : 
      29                 :            : #ifndef _GLIBCXX_ATOMICITY_H
      30                 :            : #define _GLIBCXX_ATOMICITY_H    1
      31                 :            : 
      32                 :            : #include <bits/c++config.h>
      33                 :            : #include <bits/gthr.h>
      34                 :            : #include <bits/atomic_word.h>
      35                 :            : 
      36                 :            : namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
      37                 :            : {
      38                 :            : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      39                 :            : 
      40                 :            :   // Functions for portable atomic access.
      41                 :            :   // To abstract locking primitives across all thread policies, use:
      42                 :            :   // __exchange_and_add_dispatch
      43                 :            :   // __atomic_add_dispatch
      44                 :            : #ifdef _GLIBCXX_ATOMIC_BUILTINS
      45                 :            :   static inline _Atomic_word 
      46                 :          0 :   __exchange_and_add(volatile _Atomic_word* __mem, int __val)
      47                 :          0 :   { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
      48                 :            : 
      49                 :            :   static inline void
      50                 :            :   __atomic_add(volatile _Atomic_word* __mem, int __val)
      51                 :            :   { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
      52                 :            : #else
      53                 :            :   _Atomic_word
      54                 :            :   __attribute__ ((__unused__))
      55                 :            :   __exchange_and_add(volatile _Atomic_word*, int) throw ();
      56                 :            : 
      57                 :            :   void
      58                 :            :   __attribute__ ((__unused__))
      59                 :            :   __atomic_add(volatile _Atomic_word*, int) throw ();
      60                 :            : #endif
      61                 :            : 
      62                 :            :   static inline _Atomic_word
      63                 :          0 :   __exchange_and_add_single(_Atomic_word* __mem, int __val)
      64                 :            :   {
      65                 :          0 :     _Atomic_word __result = *__mem;
      66                 :          0 :     *__mem += __val;
      67                 :          0 :     return __result;
      68                 :            :   }
      69                 :            : 
      70                 :            :   static inline void
      71                 :            :   __atomic_add_single(_Atomic_word* __mem, int __val)
      72                 :            :   { *__mem += __val; }
      73                 :            : 
      74                 :            :   static inline _Atomic_word
      75                 :            :   __attribute__ ((__unused__))
      76                 :          0 :   __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
      77                 :            :   {
      78                 :            : #ifdef __GTHREADS
      79         [ #  # ]:          0 :     if (__gthread_active_p())
      80                 :          0 :       return __exchange_and_add(__mem, __val);
      81                 :            :     else
      82                 :          0 :       return __exchange_and_add_single(__mem, __val);
      83                 :            : #else
      84                 :            :     return __exchange_and_add_single(__mem, __val);
      85                 :            : #endif
      86                 :            :   }
      87                 :            : 
      88                 :            :   static inline void
      89                 :            :   __attribute__ ((__unused__))
      90                 :            :   __atomic_add_dispatch(_Atomic_word* __mem, int __val)
      91                 :            :   {
      92                 :            : #ifdef __GTHREADS
      93                 :            :     if (__gthread_active_p())
      94                 :            :       __atomic_add(__mem, __val);
      95                 :            :     else
      96                 :            :       __atomic_add_single(__mem, __val);
      97                 :            : #else
      98                 :            :     __atomic_add_single(__mem, __val);
      99                 :            : #endif
     100                 :            :   }
     101                 :            : 
     102                 :            : _GLIBCXX_END_NAMESPACE_VERSION
     103                 :            : } // namespace
     104                 :            : 
     105                 :            : // Even if the CPU doesn't need a memory barrier, we need to ensure
     106                 :            : // that the compiler doesn't reorder memory accesses across the
     107                 :            : // barriers.
     108                 :            : #ifndef _GLIBCXX_READ_MEM_BARRIER
     109                 :            : #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
     110                 :            : #endif
     111                 :            : #ifndef _GLIBCXX_WRITE_MEM_BARRIER
     112                 :            : #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
     113                 :            : #endif
     114                 :            : 
     115                 :            : #endif 

Generated by: LCOV version 1.9