mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-26 15:00:04 +08:00
fa3d9f57b0
* config/os/hpux/os_defines.h (_GLIBCPP_INST_ATOMICITY_LOCK): Define. * src/misc-inst.cc (std): Instantiate atomicity lock when _GLIBCPP_INST_ATOMICITY_LOCK is defined. * config/cpu/hppa/atomicity.h: New file. From-SVN: r58831
88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/* Low-level functions for atomic operations. PA-RISC version. -*- C++ -*-
|
|
Copyright 2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#ifndef _BITS_ATOMICITY_H
|
|
#define _BITS_ATOMICITY_H 1
|
|
|
|
typedef int _Atomic_word;
|
|
|
|
template <int __inst>
|
|
struct __Atomicity_lock
|
|
{
|
|
static volatile int __attribute__ ((aligned (16))) _S_atomicity_lock;
|
|
};
|
|
|
|
template <int __inst>
|
|
volatile int __Atomicity_lock<__inst>::_S_atomicity_lock = 1;
|
|
|
|
/* Because of the lack of weak support when using the hpux
|
|
som linker, we explicitly instantiate the atomicity lock
|
|
in src/misc-inst.cc when _GLIBCPP_INST_ATOMICITY_LOCK
|
|
is defined. */
|
|
#ifndef _GLIBCPP_INST_ATOMICITY_LOCK
|
|
template volatile int __Atomicity_lock<0>::_S_atomicity_lock;
|
|
#endif
|
|
|
|
static inline 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));
|
|
|
|
result = *__mem;
|
|
*__mem = result + __val;
|
|
__asm__ __volatile__("");
|
|
lock = tmp;
|
|
return result;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((__unused__))
|
|
__atomic_add (_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));
|
|
|
|
*__mem += __val;
|
|
__asm__ __volatile__("");
|
|
lock = tmp;
|
|
}
|
|
|
|
#endif
|