// Low-level functions for atomic operations: PA-RISC version -*- C++ -*- // Copyright (C) 2002, 2004, 2005 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 2, 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. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. #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) { _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) { 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 |