* 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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@58831 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 102 insertions, 0 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 5b8a5bb5f19..5d53a7bb9a4 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2002-11-05  John David Anglin  <dave@hiauly1.hia.nrc.ca>
+
+	* 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.
+
 2002-11-05  Benjamin Kosnik  <bkoz@redhat.com>
 
 	PR libstdc++/8463
diff --git a/libstdc++-v3/config/cpu/hppa/atomicity.h b/libstdc++-v3/config/cpu/hppa/atomicity.h
new file mode 100644
index 00000000000..eefb32d4a8e
--- /dev/null
+++ b/libstdc++-v3/config/cpu/hppa/atomicity.h
@@ -0,0 +1,87 @@
+/* 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
diff --git a/libstdc++-v3/config/os/hpux/os_defines.h b/libstdc++-v3/config/os/hpux/os_defines.h
index 5deef5f9edb..aae9998c552 100644
--- a/libstdc++-v3/config/os/hpux/os_defines.h
+++ b/libstdc++-v3/config/os/hpux/os_defines.h
@@ -84,4 +84,8 @@ namespace std
 typedef long int __padding_type;
 #endif
 
+/* We need explicit instantiation of the atomicity lock on 32-bit HPUX.  */
+#ifndef __LP64__
+#define _GLIBCPP_INST_ATOMICITY_LOCK 1
+#endif
 #endif
diff --git a/libstdc++-v3/src/misc-inst.cc b/libstdc++-v3/src/misc-inst.cc
index ff899102009..74224b1d983 100644
--- a/libstdc++-v3/src/misc-inst.cc
+++ b/libstdc++-v3/src/misc-inst.cc
@@ -37,6 +37,7 @@
 #include <ostream>
 #include <algorithm>
 #include <vector>
+#include <bits/atomicity.h>
 
 namespace std
 {
@@ -67,6 +68,9 @@ namespace std
     basic_istream<wchar_t>& 
     getline(basic_istream<wchar_t>&, wstring&);
 #endif
+#ifdef _GLIBCPP_INST_ATOMICITY_LOCK
+  template volatile int __Atomicity_lock<0>::_S_atomicity_lock;
+#endif
 
 #if 1
   // XXX