diff options
Diffstat (limited to 'contrib/libstdc++/config/cpu/s390/atomicity.h')
-rw-r--r-- | contrib/libstdc++/config/cpu/s390/atomicity.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/contrib/libstdc++/config/cpu/s390/atomicity.h b/contrib/libstdc++/config/cpu/s390/atomicity.h new file mode 100644 index 0000000..331c29a --- /dev/null +++ b/contrib/libstdc++/config/cpu/s390/atomicity.h @@ -0,0 +1,60 @@ +// Low-level functions for atomic operations: S/390 version -*- C++ -*- + +// Copyright (C) 2001 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// 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 + +typedef int _Atomic_word; + +static inline _Atomic_word +__attribute__ ((__unused__)) +__exchange_and_add (volatile _Atomic_word *__mem, int __val) +{ + register _Atomic_word __old_val, __new_val; + + __asm__ __volatile__ (" l %0,0(%2)\n" + "0: lr %1,%0\n" + " ar %1,%3\n" + " cs %0,%1,0(%2)\n" + " jl 0b" + : "=&d" (__old_val), "=&d" (__new_val) + : "a" (__mem), "d" (__val) : "cc", "memory" ); + return __old_val; +} + +static inline void +__attribute__ ((__unused__)) +__atomic_add (volatile _Atomic_word *__mem, int __val) +{ + __exchange_and_add (__mem, __val); +} + +#endif /* atomicity.h */ + + |