LTP GCOV extension - code coverage report
Current view: | directory - usr/include/c++/4.3/ext - atomicity.h
Test: | lcov.info
Date: | 2008-08-14 |  | Instrumented lines: | 10
Code covered: | 0.0 % |  | Executed lines: | 0

           1                 : // Support for atomic operations -*- C++ -*-
           2                 :
           3                 : // Copyright (C) 2004, 2005, 2006 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 2, 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                 : // You should have received a copy of the GNU General Public License along
          17                 : // with this library; see the file COPYING.  If not, write to the Free
          18                 : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
          19                 : // USA.
          20                 :
          21                 : // As a special exception, you may use this file as part of a free software
          22                 : // library without restriction.  Specifically, if other files instantiate
          23                 : // templates or use macros or inline functions from this file, or you compile
          24                 : // this file and link it with other files to produce an executable, this
          25                 : // file does not by itself cause the resulting executable to be covered by
          26                 : // the GNU General Public License.  This exception does not however
          27                 : // invalidate any other reasons why the executable file might be covered by
          28                 : // the GNU General Public License.
          29                 :
          30                 : /** @file atomicity.h
          31                 :  *  This is an internal header file, included by other library headers.
          32                 :  *  You should not attempt to use it directly.
          33                 :  */
          34                 :
          35                 : #ifndef _GLIBCXX_ATOMICITY_H
          36                 : #define _GLIBCXX_ATOMICITY_H    1
          37                 :
          38                 : #include <bits/c++config.h>
          39                 : #include <bits/gthr.h>
          40                 : #include <bits/atomic_word.h>
          41                 :
          42                 : _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
          43                 :
          44                 :   // Functions for portable atomic access.
          45                 :   // To abstract locking primitives across all thread policies, use:
          46                 :   // __exchange_and_add_dispatch
          47                 :   // __atomic_add_dispatch
          48                 : #ifdef _GLIBCXX_ATOMIC_BUILTINS
          49                 :   static inline _Atomic_word
          50               0 :   __exchange_and_add(volatile _Atomic_word* __mem, int __val)
          51               0 :   { return __sync_fetch_and_add(__mem, __val); }
          52                 :
          53                 :   static inline void
          54                 :   __atomic_add(volatile _Atomic_word* __mem, int __val)
          55                 :   { __sync_fetch_and_add(__mem, __val); }
          56                 : #else
          57                 :   _Atomic_word
          58                 :   __attribute__ ((__unused__))
          59                 :   __exchange_and_add(volatile _Atomic_word*, int);
          60                 :
          61                 :   void
          62                 :   __attribute__ ((__unused__))
          63                 :   __atomic_add(volatile _Atomic_word*, int);
          64                 : #endif
          65                 :
          66                 :   static inline _Atomic_word
          67               0 :   __exchange_and_add_single(_Atomic_word* __mem, int __val)
          68                 :   {
          69               0 :     _Atomic_word __result = *__mem;
          70               0 :     *__mem += __val;
          71               0 :     return __result;
          72                 :   }
          73                 :
          74                 :   static inline void
          75                 :   __atomic_add_single(_Atomic_word* __mem, int __val)
          76                 :   { *__mem += __val; }
          77                 :
          78                 :   static inline _Atomic_word
          79                 :   __attribute__ ((__unused__))
          80               0 :   __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
          81                 :   {
          82                 : #ifdef __GTHREADS
          83               0 :     if (__gthread_active_p())
          84               0 :       return __exchange_and_add(__mem, __val);
          85                 :     else
          86               0 :       return __exchange_and_add_single(__mem, __val);
          87                 : #else
          88                 :     return __exchange_and_add_single(__mem, __val);
          89                 : #endif
          90                 :   }
          91                 :
          92                 :   static inline void
          93                 :   __attribute__ ((__unused__))
          94                 :   __atomic_add_dispatch(_Atomic_word* __mem, int __val)
          95                 :   {
          96                 : #ifdef __GTHREADS
          97                 :     if (__gthread_active_p())
          98                 :       __atomic_add(__mem, __val);
          99                 :     else
         100                 :       __atomic_add_single(__mem, __val);
         101                 : #else
         102                 :     __atomic_add_single(__mem, __val);
         103                 : #endif
         104                 :   }
         105                 :
         106                 : _GLIBCXX_END_NAMESPACE
         107                 :
         108                 : // Even if the CPU doesn't need a memory barrier, we need to ensure
         109                 : // that the compiler doesn't reorder memory accesses across the
         110                 : // barriers.
         111                 : #ifndef _GLIBCXX_READ_MEM_BARRIER
         112                 : #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
         113                 : #endif
         114                 : #ifndef _GLIBCXX_WRITE_MEM_BARRIER
         115                 : #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
         116                 : #endif
         117                 :
         118                 : #endif

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