* [v3] libstdc++/49745 (review required for the gthr-posix.h changes)
@ 2011-07-15 13:04 Paolo Carlini
2011-07-15 13:46 ` Jason Merrill
0 siblings, 1 reply; 6+ messages in thread
From: Paolo Carlini @ 2011-07-15 13:04 UTC (permalink / raw)
To: gcc-patches; +Cc: libstdc++, Jakub Jelinek, Jason Merrill, Ian Lance Taylor
[-- Attachment #1: Type: text/plain, Size: 525 bytes --]
Hi,
this is what I did in terms of implementing Jon's and Jakub's
suggestions: many thanks to both of you!
The patch should be in general quite conservative and safe, in
particular, the gthr-posix.h changes, which I cannot approve myself,
touch bits only used by libstdc++-v3 + the macro avoiding the
unconditional inclusion of <unistd.h>, which, according to Jakub's
analysis, should be required only by objc.
I built and tested c++ and its lib and built all languages. Ok?
Thanks,
Paolo.
///////////////////////
[-- Attachment #2: CL_49745 --]
[-- Type: text/plain, Size: 706 bytes --]
/gcc
2011-07-15 Paolo Carlini <paolo.carlini@oracle.com>
Jakub Jelinek <jakub@redhat.com>
Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/49745
* gthr-posix.h: Do not include <unistd.h> unconditionally; use
_GTHREADS_ASSUME_POSIX_TIMEOUTS instead of _POSIX_TIMEOUTS.
/libstdc++-v3
2011-07-15 Paolo Carlini <paolo.carlini@oracle.com>
Jakub Jelinek <jakub@redhat.com>
PR libstdc++/49745
* acinclude.m4 ([GLIBCXX_CHECK_GTHREADS]): Check separately for
_POSIX_TIMEOUTS and define _GTHREADS_ASSUME_POSIX_TIMEOUTS.
* libstdc++-v3/libsupc++/guard.cc: Include <unistd.h>.
* testsuite/17_intro/headers/c++1998/49745.cc: New.
* configure: Regenerate.
* config.h.in: Likewise.
[-- Attachment #3: patch_49745 --]
[-- Type: text/plain, Size: 5088 bytes --]
Index: libstdc++-v3/libsupc++/guard.cc
===================================================================
--- libstdc++-v3/libsupc++/guard.cc (revision 176310)
+++ libstdc++-v3/libsupc++/guard.cc (working copy)
@@ -35,6 +35,7 @@
&& defined(_GLIBCXX_ATOMIC_BUILTINS_4) && defined(_GLIBCXX_HAVE_LINUX_FUTEX)
# include <climits>
# include <syscall.h>
+# include <unistd.h>
# define _GLIBCXX_USE_FUTEX
# define _GLIBCXX_FUTEX_WAIT 0
# define _GLIBCXX_FUTEX_WAKE 1
Index: libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc
===================================================================
--- libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc (revision 0)
+++ libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc (revision 0)
@@ -0,0 +1,22 @@
+// { dg-do compile }
+
+// Copyright (C) 2011 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 3, 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 COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// libstdc++/49745
+#include <iostream>
+int truncate = 0;
Index: libstdc++-v3/acinclude.m4
===================================================================
--- libstdc++-v3/acinclude.m4 (revision 176310)
+++ libstdc++-v3/acinclude.m4 (working copy)
@@ -3155,6 +3155,22 @@
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions -I${toplevel_srcdir}/gcc"
+ AC_MSG_CHECKING([for _POSIX_TIMEOUTS >= 0 in <unistd.h>])
+
+ AC_TRY_COMPILE([#include <unistd.h>],
+ [
+ #if !defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS < 0
+ #error
+ #endif
+ ], [ac_assume_posix_timeouts=yes], [ac_assume_posix_timeouts=no])
+
+ AC_MSG_RESULT([$ac_assume_posix_timeouts])
+
+ if test x"$ac_assume_posix_timeouts" = x"yes"; then
+ AC_DEFINE(_GTHREADS_ASSUME_POSIX_TIMEOUTS, 1,
+ [Define if _POSIX_TIMEOUT is defined >= 0 by <unistd.h>.])
+ fi
+
target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
case $target_thread_file in
posix)
@@ -3163,7 +3179,10 @@
AC_MSG_CHECKING([for gthreads library])
- AC_TRY_COMPILE([#include "gthr.h"],
+ AC_TRY_COMPILE([
+ #include "gthr.h"
+ #include <unistd.h>
+ ],
[
#ifndef __GTHREADS_CXX0X
#error
Index: gcc/gthr-posix.h
===================================================================
--- gcc/gthr-posix.h (revision 176310)
+++ gcc/gthr-posix.h (working copy)
@@ -1,7 +1,7 @@
/* Threads compatibility routines for libgcc2 and libobjc. */
/* Compile this one with gcc. */
/* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
- 2008, 2009, 2010 Free Software Foundation, Inc.
+ 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
This file is part of GCC.
@@ -39,7 +39,10 @@
#endif
#include <pthread.h>
+
+#if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
#include <unistd.h>
+#endif
typedef pthread_t __gthread_t;
typedef pthread_key_t __gthread_key_t;
@@ -100,11 +103,9 @@
__gthrw3(pthread_mutex_lock)
__gthrw3(pthread_mutex_trylock)
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#ifdef _GTHREADS_ASSUME_POSIX_TIMEOUTS
__gthrw3(pthread_mutex_timedlock)
#endif
-#endif /* _POSIX_TIMEOUTS */
__gthrw3(pthread_mutex_unlock)
__gthrw3(pthread_mutex_init)
__gthrw3(pthread_mutex_destroy)
@@ -131,11 +132,9 @@
__gthrw(pthread_mutex_lock)
__gthrw(pthread_mutex_trylock)
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#ifdef _GTHREADS_ASSUME_POSIX_TIMEOUTS
__gthrw(pthread_mutex_timedlock)
#endif
-#endif /* _POSIX_TIMEOUTS */
__gthrw(pthread_mutex_unlock)
__gthrw(pthread_mutex_init)
__gthrw(pthread_mutex_destroy)
@@ -753,8 +752,7 @@
return 0;
}
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#ifdef _GTHREADS_ASSUME_POSIX_TIMEOUTS
static inline int
__gthread_mutex_timedlock (__gthread_mutex_t *__mutex,
const __gthread_time_t *__abs_timeout)
@@ -765,7 +763,6 @@
return 0;
}
#endif
-#endif
static inline int
__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
@@ -811,8 +808,7 @@
return __gthread_mutex_trylock (__mutex);
}
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#ifdef _GTHREADS_ASSUME_POSIX_TIMEOUTS
static inline int
__gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex,
const __gthread_time_t *__abs_timeout)
@@ -820,7 +816,6 @@
return __gthread_mutex_timedlock (__mutex, __abs_timeout);
}
#endif
-#endif
static inline int
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [v3] libstdc++/49745 (review required for the gthr-posix.h changes)
2011-07-15 13:04 [v3] libstdc++/49745 (review required for the gthr-posix.h changes) Paolo Carlini
@ 2011-07-15 13:46 ` Jason Merrill
2011-07-15 15:06 ` Paolo Carlini
2011-07-15 15:25 ` Jakub Jelinek
0 siblings, 2 replies; 6+ messages in thread
From: Jason Merrill @ 2011-07-15 13:46 UTC (permalink / raw)
To: Paolo Carlini; +Cc: gcc-patches, libstdc++, Jakub Jelinek, Ian Lance Taylor
On 07/15/2011 08:47 AM, Paolo Carlini wrote:
> The patch should be in general quite conservative and safe, in
> particular, the gthr-posix.h changes, which I cannot approve myself,
> touch bits only used by libstdc++-v3 + the macro avoiding the
> unconditional inclusion of <unistd.h>, which, according to Jakub's
> analysis, should be required only by objc.
I'm a little uncomfortable with defining a macro in libstdc++ to be used
by the gthr files in gcc. I would lean more toward a gthr-posix-conf.h
generated by GCC configure.
Jason
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [v3] libstdc++/49745 (review required for the gthr-posix.h changes)
2011-07-15 13:46 ` Jason Merrill
@ 2011-07-15 15:06 ` Paolo Carlini
2011-07-15 15:25 ` Jakub Jelinek
1 sibling, 0 replies; 6+ messages in thread
From: Paolo Carlini @ 2011-07-15 15:06 UTC (permalink / raw)
To: Jason Merrill; +Cc: gcc-patches, libstdc++, Jakub Jelinek, Ian Lance Taylor
On 07/15/2011 03:36 PM, Jason Merrill wrote:
> I'm a little uncomfortable with defining a macro in libstdc++ to be
> used by the gthr files in gcc. I would lean more toward a
> gthr-posix-conf.h generated by GCC configure.
For sure, I gonna need some help for that... or maybe Jakub can do it?
Paolo.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [v3] libstdc++/49745 (review required for the gthr-posix.h changes)
2011-07-15 13:46 ` Jason Merrill
2011-07-15 15:06 ` Paolo Carlini
@ 2011-07-15 15:25 ` Jakub Jelinek
2011-07-15 15:43 ` Paolo Carlini
1 sibling, 1 reply; 6+ messages in thread
From: Jakub Jelinek @ 2011-07-15 15:25 UTC (permalink / raw)
To: Jason Merrill; +Cc: Paolo Carlini, gcc-patches, libstdc++, Ian Lance Taylor
On Fri, Jul 15, 2011 at 09:36:48AM -0400, Jason Merrill wrote:
> On 07/15/2011 08:47 AM, Paolo Carlini wrote:
> >The patch should be in general quite conservative and safe, in
> >particular, the gthr-posix.h changes, which I cannot approve myself,
> >touch bits only used by libstdc++-v3 + the macro avoiding the
> >unconditional inclusion of <unistd.h>, which, according to Jakub's
> >analysis, should be required only by objc.
>
> I'm a little uncomfortable with defining a macro in libstdc++ to be
> used by the gthr files in gcc. I would lean more toward a
> gthr-posix-conf.h generated by GCC configure.
gthr-posix.h already uses other macros defined by other library
headers, like _LIBOBJC. gthr-posix-conf.h looks like an overkill to me,
but if e.g. libstdc++ headers defined a 0/1 macro always
(_GTHREAD_USE_TIMEDLOCK 0 would mean don't define it, _GTHREAD_USE_TIMEDLOCK 1
would mean you can safely assume timedlock is available, and not presence
of that macro would lead to inclusion of unistd.h and deciding itself
based on _POSIX_TIMEOUTS:
#ifndef _GTHREAD_USE_TIMEDLOCK
#include <unistd.h>
#ifdef _POSIX_TIMEOUTS
#if _POSIX_TIMEOUTS >= 0
#define _GTHREAD_USE_TIMEDLOCK 1
#else
#define _GTHREAD_USE_TIMEDLOCK 0
#else
#define _GTHREAD_USE_TIMEDLOCK 0
#endif
and use
#if _GTHREAD_USE_TIMEDLOCK
...
#endif
then when gthr.h is used outside of libstdc++ it wouldn't depend on
libstdc++ configury.
Jakub
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [v3] libstdc++/49745 (review required for the gthr-posix.h changes)
2011-07-15 15:25 ` Jakub Jelinek
@ 2011-07-15 15:43 ` Paolo Carlini
2011-07-15 20:03 ` Jason Merrill
0 siblings, 1 reply; 6+ messages in thread
From: Paolo Carlini @ 2011-07-15 15:43 UTC (permalink / raw)
To: Jakub Jelinek; +Cc: Jason Merrill, gcc-patches, libstdc++, Ian Lance Taylor
[-- Attachment #1: Type: text/plain, Size: 851 bytes --]
Hi,
> gthr-posix.h already uses other macros defined by other library
> headers, like _LIBOBJC. gthr-posix-conf.h looks like an overkill to me,
> but if e.g. libstdc++ headers defined a 0/1 macro always
> (_GTHREAD_USE_TIMEDLOCK 0 would mean don't define it, _GTHREAD_USE_TIMEDLOCK 1
> would mean you can safely assume timedlock is available, and not presence
> of that macro would lead to inclusion of unistd.h and deciding itself
> based on _POSIX_TIMEOUTS:
>
> #ifndef _GTHREAD_USE_TIMEDLOCK
> #include<unistd.h>
> #ifdef _POSIX_TIMEOUTS
> #if _POSIX_TIMEOUTS>= 0
> #define _GTHREAD_USE_TIMEDLOCK 1
> #else
> #define _GTHREAD_USE_TIMEDLOCK 0
> #else
> #define _GTHREAD_USE_TIMEDLOCK 0
> #endif
> and use
>
> #if _GTHREAD_USE_TIMEDLOCK
> ...
> #endif
>
I'm finishing testing the below. Appears to work well, so far...
Paolo.
////////////////////
[-- Attachment #2: CL_49745_2 --]
[-- Type: text/plain, Size: 702 bytes --]
/gcc
2011-07-15 Paolo Carlini <paolo.carlini@oracle.com>
Jakub Jelinek <jakub@redhat.com>
Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/49745
* gthr-posix.h: Do not include <unistd.h> unconditionally; use
_GTHREADS_USE_MUTEX_TIMEDLOCK instead of _POSIX_TIMEOUTS.
/libstdc++-v3
2011-07-15 Paolo Carlini <paolo.carlini@oracle.com>
Jakub Jelinek <jakub@redhat.com>
PR libstdc++/49745
* acinclude.m4 ([GLIBCXX_CHECK_GTHREADS]): Check separately for
_POSIX_TIMEOUTS and define _GTHREADS_USE_MUTEX_TIMEDLOCK.
* libstdc++-v3/libsupc++/guard.cc: Include <unistd.h>.
* testsuite/17_intro/headers/c++1998/49745.cc: New.
* configure: Regenerate.
* config.h.in: Likewise.
[-- Attachment #3: patch_49745_2 --]
[-- Type: text/plain, Size: 5490 bytes --]
Index: libstdc++-v3/libsupc++/guard.cc
===================================================================
--- libstdc++-v3/libsupc++/guard.cc (revision 176310)
+++ libstdc++-v3/libsupc++/guard.cc (working copy)
@@ -35,6 +35,7 @@
&& defined(_GLIBCXX_ATOMIC_BUILTINS_4) && defined(_GLIBCXX_HAVE_LINUX_FUTEX)
# include <climits>
# include <syscall.h>
+# include <unistd.h>
# define _GLIBCXX_USE_FUTEX
# define _GLIBCXX_FUTEX_WAIT 0
# define _GLIBCXX_FUTEX_WAKE 1
Index: libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc
===================================================================
--- libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc (revision 0)
+++ libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc (revision 0)
@@ -0,0 +1,22 @@
+// { dg-do compile { target *-*-linux* } }
+
+// Copyright (C) 2011 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 3, 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 COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// libstdc++/49745
+#include <iostream>
+int truncate = 0;
Index: libstdc++-v3/acinclude.m4
===================================================================
--- libstdc++-v3/acinclude.m4 (revision 176310)
+++ libstdc++-v3/acinclude.m4 (working copy)
@@ -3155,6 +3155,22 @@
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions -I${toplevel_srcdir}/gcc"
+ AC_MSG_CHECKING([check whether it can be safely assumed that mutex_timedlock is available])
+
+ AC_TRY_COMPILE([#include <unistd.h>],
+ [
+ #if !defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS < 0
+ #error
+ #endif
+ ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
+
+ AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
+ [Define to 1 if mutex_timedlock is available.])
+
+ if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
+ else res_mutex_timedlock=no ; fi
+ AC_MSG_RESULT([$res_mutex_timedlock])
+
target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
case $target_thread_file in
posix)
@@ -3163,7 +3179,10 @@
AC_MSG_CHECKING([for gthreads library])
- AC_TRY_COMPILE([#include "gthr.h"],
+ AC_TRY_COMPILE([
+ #include "gthr.h"
+ #include <unistd.h>
+ ],
[
#ifndef __GTHREADS_CXX0X
#error
Index: gcc/gthr-posix.h
===================================================================
--- gcc/gthr-posix.h (revision 176310)
+++ gcc/gthr-posix.h (working copy)
@@ -1,7 +1,7 @@
/* Threads compatibility routines for libgcc2 and libobjc. */
/* Compile this one with gcc. */
/* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
- 2008, 2009, 2010 Free Software Foundation, Inc.
+ 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
This file is part of GCC.
@@ -39,8 +39,17 @@
#endif
#include <pthread.h>
-#include <unistd.h>
+#if ((defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)) \
+ || !defined(_GTHREAD_USE_MUTEX_TIMEDLOCK))
+# include <unistd.h>
+# if defined(_POSIX_TIMEOUTS) && _POSIX_TIMEOUTS >= 0
+# define _GTHREAD_USE_MUTEX_TIMEDLOCK 1
+# else
+# define _GTHREAD_USE_MUTEX_TIMEDLOCK 0
+# endif
+#endif
+
typedef pthread_t __gthread_t;
typedef pthread_key_t __gthread_key_t;
typedef pthread_once_t __gthread_once_t;
@@ -100,11 +109,9 @@
__gthrw3(pthread_mutex_lock)
__gthrw3(pthread_mutex_trylock)
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
__gthrw3(pthread_mutex_timedlock)
#endif
-#endif /* _POSIX_TIMEOUTS */
__gthrw3(pthread_mutex_unlock)
__gthrw3(pthread_mutex_init)
__gthrw3(pthread_mutex_destroy)
@@ -131,11 +138,9 @@
__gthrw(pthread_mutex_lock)
__gthrw(pthread_mutex_trylock)
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
__gthrw(pthread_mutex_timedlock)
#endif
-#endif /* _POSIX_TIMEOUTS */
__gthrw(pthread_mutex_unlock)
__gthrw(pthread_mutex_init)
__gthrw(pthread_mutex_destroy)
@@ -753,8 +758,7 @@
return 0;
}
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
static inline int
__gthread_mutex_timedlock (__gthread_mutex_t *__mutex,
const __gthread_time_t *__abs_timeout)
@@ -765,7 +769,6 @@
return 0;
}
#endif
-#endif
static inline int
__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
@@ -811,8 +814,7 @@
return __gthread_mutex_trylock (__mutex);
}
-#ifdef _POSIX_TIMEOUTS
-#if _POSIX_TIMEOUTS >= 0
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
static inline int
__gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex,
const __gthread_time_t *__abs_timeout)
@@ -820,7 +822,6 @@
return __gthread_mutex_timedlock (__mutex, __abs_timeout);
}
#endif
-#endif
static inline int
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
^ permalink raw reply [flat|nested] 6+ messages in thread
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2011-07-15 13:04 [v3] libstdc++/49745 (review required for the gthr-posix.h changes) Paolo Carlini
2011-07-15 13:46 ` Jason Merrill
2011-07-15 15:06 ` Paolo Carlini
2011-07-15 15:25 ` Jakub Jelinek
2011-07-15 15:43 ` Paolo Carlini
2011-07-15 20:03 ` Jason Merrill
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