diff options
Diffstat (limited to 'contrib/libstdc++/config/cpu/hppa/atomicity.h')
-rw-r--r-- | contrib/libstdc++/config/cpu/hppa/atomicity.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/contrib/libstdc++/config/cpu/hppa/atomicity.h b/contrib/libstdc++/config/cpu/hppa/atomicity.h new file mode 100644 index 0000000..d99ac34 --- /dev/null +++ b/contrib/libstdc++/config/cpu/hppa/atomicity.h @@ -0,0 +1,90 @@ +/* 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 _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 + 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; + /* Reset lock with PA 2.0 "ordered" store. */ + __asm__ __volatile__ ("stw,ma %1,0(%0)" + : : "r" (&lock), "r" (tmp) : "memory"); + 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; + /* Reset lock with PA 2.0 "ordered" store. */ + __asm__ __volatile__ ("stw,ma %1,0(%0)" + : : "r" (&lock), "r" (tmp) : "memory"); +} + +#endif |