1// Low-level functions for atomic operations: Generic version -*- C++ -*- 2 3// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005 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 2, 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// You should have received a copy of the GNU General Public License along 18// with this library; see the file COPYING. If not, write to the Free 19// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20// USA. 21 22// As a special exception, you may use this file as part of a free software 23// library without restriction. Specifically, if other files instantiate 24// templates or use macros or inline functions from this file, or you compile 25// this file and link it with other files to produce an executable, this 26// file does not by itself cause the resulting executable to be covered by 27// the GNU General Public License. This exception does not however 28// invalidate any other reasons why the executable file might be covered by 29// the GNU General Public License. 30 31#ifndef _BITS_ATOMICITY_H 32#define _BITS_ATOMICITY_H 1 33 34#ifdef __SH4A__ 35 36typedef int _Atomic_word; 37 38static inline _Atomic_word 39__attribute__ ((__unused__)) 40__exchange_and_add (volatile _Atomic_word* __mem, int __val) 41{ 42 _Atomic_word __result; 43 44 __asm__ __volatile__ 45 ("0:\n" 46 "\tmovli.l\t@%2,r0\n" 47 "\tmov\tr0,%1\n" 48 "\tadd\t%3,r0\n" 49 "\tmovco.l\tr0,@%2\n" 50 "\tbf\t0b" 51 : "+m" (*__mem), "=r" (__result) 52 : "r" (__mem), "rI08" (__val) 53 : "r0"); 54 55 return __result; 56} 57 58 59static inline void 60__attribute__ ((__unused__)) 61__atomic_add (volatile _Atomic_word* __mem, int __val) 62{ 63 asm("0:\n" 64 "\tmovli.l\t@%1,r0\n" 65 "\tadd\t%2,r0\n" 66 "\tmovco.l\tr0,@%1\n" 67 "\tbf\t0b" 68 : "+m" (*__mem) 69 : "r" (__mem), "rI08" (__val) 70 : "r0"); 71} 72 73#else /* !__SH4A__ */ 74 75/* This is generic/atomicity.h */ 76 77#include <bits/atomicity.h> 78#include <bits/concurrence.h> 79 80namespace __gnu_internal 81{ 82 __glibcxx_mutex_define_initialized(atomic_mutex); 83} // namespace __gnu_internal 84 85namespace __gnu_cxx 86{ 87 _Atomic_word 88 __attribute__ ((__unused__)) 89 __exchange_and_add(volatile _Atomic_word* __mem, int __val) 90 { 91 __glibcxx_mutex_lock(__gnu_internal::atomic_mutex); 92 _Atomic_word __result; 93 __result = *__mem; 94 *__mem += __val; 95 __glibcxx_mutex_unlock(__gnu_internal::atomic_mutex); 96 return __result; 97 } 98 99 void 100 __attribute__ ((__unused__)) 101 __atomic_add(volatile _Atomic_word* __mem, int __val) 102 { __exchange_and_add(__mem, __val); } 103} // namespace __gnu_cxx 104 105#endif /* !__SH4A__ */ 106 107#endif /* atomicity.h */ 108