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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libstdc++-v3/] [config/] [cpu/] [hppa/] [atomicity.h] - Rev 424
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// Low-level functions for atomic operations: PA-RISC version -*- C++ -*- // Copyright (C) 2002, 2004, 2005, 2009 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. #include <bits/c++config.h> #include <ext/atomicity.h> _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) template<int _Inst> struct _Atomicity_lock { static volatile int _S_atomicity_lock; }; template<int _Inst> volatile int _Atomicity_lock<_Inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1; // Because of the lack of weak support when using the hpux som // linker, we explicitly instantiate the atomicity lock. template volatile int _Atomicity_lock<0>::_S_atomicity_lock; int __attribute__ ((__unused__)) __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () { _Atomic_word result; int tmp; volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock; __asm__ __volatile__ ("ldcw 0(%1),%0\n\t" "cmpib,<>,n 0,%0,.+20\n\t" "ldw 0(%1),%0\n\t" "cmpib,= 0,%0,.-4\n\t" "nop\n\t" "b,n .-20" : "=&r" (tmp) : "r" (&lock) : "memory"); result = *__mem; *__mem = result + __val; __asm__ __volatile__ ("stw %1,0(%0)" : : "r" (&lock), "r" (tmp) : "memory"); return result; } void __attribute__ ((__unused__)) __atomic_add(volatile _Atomic_word* __mem, int __val) throw () { int tmp; volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock; __asm__ __volatile__ ("ldcw 0(%1),%0\n\t" "cmpib,<>,n 0,%0,.+20\n\t" "ldw 0(%1),%0\n\t" "cmpib,= 0,%0,.-4\n\t" "nop\n\t" "b,n .-20" : "=&r" (tmp) : "r" (&lock) : "memory"); *__mem += __val; __asm__ __volatile__ ("stw %1,0(%0)" : : "r" (&lock), "r" (tmp) : "memory"); } _GLIBCXX_END_NAMESPACE
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