LCOV - code coverage report
Current view: top level - ext - atomicity.h (source / functions) Hit Total Coverage
Test: stap.info Lines: 12 19 63.2 %
Date: 2013-03-08 Functions: 4 6 66.7 %
Branches: 2 4 50.0 %

           Branch data     Line data    Source code
       1                 :            : // Support for atomic operations -*- C++ -*-
       2                 :            : 
       3                 :            : // Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2011, 2012
       4                 :            : // Free Software Foundation, Inc.
       5                 :            : //
       6                 :            : // This file is part of the GNU ISO C++ Library.  This library is free
       7                 :            : // software; you can redistribute it and/or modify it under the
       8                 :            : // terms of the GNU General Public License as published by the
       9                 :            : // Free Software Foundation; either version 3, or (at your option)
      10                 :            : // any later version.
      11                 :            : 
      12                 :            : // This library is distributed in the hope that it will be useful,
      13                 :            : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      14                 :            : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15                 :            : // GNU General Public License for more details.
      16                 :            : 
      17                 :            : // Under Section 7 of GPL version 3, you are granted additional
      18                 :            : // permissions described in the GCC Runtime Library Exception, version
      19                 :            : // 3.1, as published by the Free Software Foundation.
      20                 :            : 
      21                 :            : // You should have received a copy of the GNU General Public License and
      22                 :            : // a copy of the GCC Runtime Library Exception along with this program;
      23                 :            : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      24                 :            : // <http://www.gnu.org/licenses/>.
      25                 :            : 
      26                 :            : /** @file ext/atomicity.h
      27                 :            :  *  This file is a GNU extension to the Standard C++ Library.
      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                 :            : namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
      38                 :            : {
      39                 :            : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      40                 :            : 
      41                 :            :   // Functions for portable atomic access.
      42                 :            :   // To abstract locking primitives across all thread policies, use:
      43                 :            :   // __exchange_and_add_dispatch
      44                 :            :   // __atomic_add_dispatch
      45                 :            : #ifdef _GLIBCXX_ATOMIC_BUILTINS
      46                 :            :   static inline _Atomic_word 
      47                 :       6624 :   __exchange_and_add(volatile _Atomic_word* __mem, int __val)
      48                 :       6624 :   { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
      49                 :            : 
      50                 :            :   static inline void
      51                 :       3930 :   __atomic_add(volatile _Atomic_word* __mem, int __val)
      52                 :       3930 :   { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
      53                 :            : #else
      54                 :            :   _Atomic_word
      55                 :            :   __attribute__ ((__unused__))
      56                 :            :   __exchange_and_add(volatile _Atomic_word*, int) throw ();
      57                 :            : 
      58                 :            :   void
      59                 :            :   __attribute__ ((__unused__))
      60                 :            :   __atomic_add(volatile _Atomic_word*, int) throw ();
      61                 :            : #endif
      62                 :            : 
      63                 :            :   static inline _Atomic_word
      64                 :          0 :   __exchange_and_add_single(_Atomic_word* __mem, int __val)
      65                 :            :   {
      66                 :          0 :     _Atomic_word __result = *__mem;
      67                 :          0 :     *__mem += __val;
      68                 :          0 :     return __result;
      69                 :            :   }
      70                 :            : 
      71                 :            :   static inline void
      72                 :          0 :   __atomic_add_single(_Atomic_word* __mem, int __val)
      73                 :          0 :   { *__mem += __val; }
      74                 :            : 
      75                 :            :   static inline _Atomic_word
      76                 :            :   __attribute__ ((__unused__))
      77                 :       6624 :   __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
      78                 :            :   {
      79                 :            : #ifdef __GTHREADS
      80         [ +  - ]:       6624 :     if (__gthread_active_p())
      81                 :       6624 :       return __exchange_and_add(__mem, __val);
      82                 :            :     else
      83                 :       6624 :       return __exchange_and_add_single(__mem, __val);
      84                 :            : #else
      85                 :            :     return __exchange_and_add_single(__mem, __val);
      86                 :            : #endif
      87                 :            :   }
      88                 :            : 
      89                 :            :   static inline void
      90                 :            :   __attribute__ ((__unused__))
      91                 :       3930 :   __atomic_add_dispatch(_Atomic_word* __mem, int __val)
      92                 :            :   {
      93                 :            : #ifdef __GTHREADS
      94         [ +  - ]:       3930 :     if (__gthread_active_p())
      95                 :       3930 :       __atomic_add(__mem, __val);
      96                 :            :     else
      97                 :          0 :       __atomic_add_single(__mem, __val);
      98                 :            : #else
      99                 :            :     __atomic_add_single(__mem, __val);
     100                 :            : #endif
     101                 :       3930 :   }
     102                 :            : 
     103                 :            : _GLIBCXX_END_NAMESPACE_VERSION
     104                 :            : } // namespace
     105                 :            : 
     106                 :            : // Even if the CPU doesn't need a memory barrier, we need to ensure
     107                 :            : // that the compiler doesn't reorder memory accesses across the
     108                 :            : // barriers.
     109                 :            : #ifndef _GLIBCXX_READ_MEM_BARRIER
     110                 :            : #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
     111                 :            : #endif
     112                 :            : #ifndef _GLIBCXX_WRITE_MEM_BARRIER
     113                 :            : #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
     114                 :            : #endif
     115                 :            : 
     116                 :            : #endif 

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