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