| // Low-level functions for atomic operations: sh version -*- C++ -*- |
| |
| // Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006 |
| // 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. |
| |
| #ifndef _BITS_ATOMICITY_H |
| #define _BITS_ATOMICITY_H 1 |
| |
| #ifdef __SH4A__ |
| |
| typedef int _Atomic_word; |
| |
| static inline _Atomic_word |
| __attribute__ ((__unused__)) |
| __exchange_and_add (volatile _Atomic_word* __mem, int __val) |
| { |
| _Atomic_word __result; |
| |
| __asm__ __volatile__ |
| ("0:\n" |
| "\tmovli.l\t@%2,r0\n" |
| "\tmov\tr0,%1\n" |
| "\tadd\t%3,r0\n" |
| "\tmovco.l\tr0,@%2\n" |
| "\tbf\t0b" |
| : "+m" (*__mem), "=r" (__result) |
| : "r" (__mem), "rI08" (__val) |
| : "r0"); |
| |
| return __result; |
| } |
| |
| |
| static inline void |
| __attribute__ ((__unused__)) |
| __atomic_add (volatile _Atomic_word* __mem, int __val) |
| { |
| asm("0:\n" |
| "\tmovli.l\t@%1,r0\n" |
| "\tadd\t%2,r0\n" |
| "\tmovco.l\tr0,@%1\n" |
| "\tbf\t0b" |
| : "+m" (*__mem) |
| : "r" (__mem), "rI08" (__val) |
| : "r0"); |
| } |
| |
| #else /* !__SH4A__ */ |
| |
| /* This is generic/atomicity.h */ |
| |
| #include <ext/atomicity.h> |
| #include <ext/concurrence.h> |
| |
| namespace |
| { |
| __gnu_cxx::__mutex atomic_mutex; |
| } // anonymous namespace |
| |
| _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
| |
| _Atomic_word |
| __attribute__ ((__unused__)) |
| __exchange_and_add(volatile _Atomic_word* __mem, int __val) |
| { |
| __gnu_cxx::__scoped_lock sentry(atomic_mutex); |
| _Atomic_word __result; |
| __result = *__mem; |
| *__mem += __val; |
| return __result; |
| } |
| |
| void |
| __attribute__ ((__unused__)) |
| __atomic_add(volatile _Atomic_word* __mem, int __val) |
| { __exchange_and_add(__mem, __val); } |
| |
| _GLIBCXX_END_NAMESPACE |
| |
| #endif /* !__SH4A__ */ |
| |
| #endif /* atomicity.h */ |