On 26 August 2012 18:06, Jonathan Wakely wrote:
> On Aug 26, 2012 4:17 PM, "H.J. Lu" wrote:
>>
>> Hi,
>>
>> According to
>>
>> http://gcc.gnu.org/ml/libstdc++/2010-04/msg00064.html
>>
>> One reason of --enable-libstdcxx-time=no on Linux is
>> "not all users will want for an experimental c++0x mode."
>> Is this feature still experimental today?
>
> See http://gcc.gnu.org/ml/libstdc++/2012-05/msg00085.html
>
> I'm working on a patch to enable it by default and to define
> this_thread::sleep_xxx and this_thread::yield unconditionally.
For anyone interested, here's a work-in-progress patch that enables
this_thread::sleep_for() and this_thread::yield() unconditionally, so
those APIs are complete even if --enable-libstdcxx-time isn't used.
commit 5fb51138670365f69942c42da7b0ec24a1e752d2
Author: Jonathan Wakely <jwakely....@gmail.com>
Date: Thu Aug 9 20:16:13 2012 +0100
* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Check for usleep and
sleep if nanosleep is not available. Bump libtool revision.
* config.h.in: Regenerate.
* configure: Likewise.
* config/abi/pre/gnu.ver (GLIBCXX_3.4.18): Add __sleep_for.
* include/std/thread (this_thread::__sleep_for): Add.
(this_thread::yield,this_thread::sleep_until, this_thread::sleep_for):
Declare unconditionally.
* src/c++11/thread.cc (this_thread::__sleep_for): Define.
* testsuite/lib/libstdc++.exp (check_v3_target_nanosleep): Rename to
check_v3_target_sleep.
* testsuite/lib/dg-options.exp (dg-require-nanosleep): Rename to
dg-require-sleep.
* testsuite/30_threads/condition_variable_any/53830.cc: Update.
* testsuite/30_threads/this_thread/2.cc: Likewise.
* testsuite/30_threads/this_thread/3.cc: Likewise.
* testsuite/30_threads/this_thread/4.cc: Likewise.
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 1179407..b9f8ed5 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -1246,6 +1246,20 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
if test x"$ac_has_nanosleep" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
[ Defined if nanosleep is available. ])
+ else
+ AC_MSG_CHECKING([for sleep])
+ AC_TRY_COMPILE([#include <unistd.h>],
+ [sleep(1)],
+ [AC_DEFINE(HAVE_SLEEP,1,
+ [Defined if sleep exists.])],[])
+ AC_MSG_RESULT($ac_has_sleep)
+ AC_MSG_CHECKING([for usleep])
+ AC_TRY_COMPILE([#include <unistd.h>],
+ [sleep(1);
+ usleep(100);],
+ [AC_DEFINE(HAVE_USLEEP,1,
+ [Defined if usleep exists.])],[])
+ AC_MSG_RESULT($ac_has_usleep)
fi
AC_SUBST(GLIBCXX_LIBS)
@@ -3139,7 +3153,7 @@ changequote([,])dnl
fi
# For libtool versioning info, format is CURRENT:REVISION:AGE
-libtool_VERSION=6:17:0
+libtool_VERSION=6:18:0
# Everything parsed; figure out what files and settings to use.
case $enable_symvers in
diff --git a/libstdc++-v3/config/abi/pre/gnu.ver
b/libstdc++-v3/config/abi/pre/gnu.ver
index cd0be4e..13e4cf8 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -1321,6 +1321,13 @@ GLIBCXX_3.4.17 {
} GLIBCXX_3.4.16;
+GLIBCXX_3.4.18 {
+
+ # std::this_thread::__sleep_for
+ _ZNSt11this_thread11__sleep_for*;
+
+} GLIBCXX_3.4.17;
+
# Symbols in the support library (libsupc++) have their own tag.
CXXABI_1.3 {
diff --git a/libstdc++-v3/include/std/thread b/libstdc++-v3/include/std/thread
index 8a45b65..6f1e3fc 100644
--- a/libstdc++-v3/include/std/thread
+++ b/libstdc++-v3/include/std/thread
@@ -249,32 +249,39 @@ _GLIBCXX_END_NAMESPACE_VERSION
inline thread::id
get_id() noexcept { return thread::id(__gthread_self()); }
-#ifdef _GLIBCXX_USE_SCHED_YIELD
/// yield
inline void
yield() noexcept
- { __gthread_yield(); }
+ {
+#ifdef _GLIBCXX_USE_SCHED_YIELD
+ __gthread_yield();
#endif
+ }
+
+ void
+ __sleep_for(chrono::seconds, chrono::nanoseconds);
#ifdef _GLIBCXX_USE_NANOSLEEP
+ inline void
+ __sleep_for(chrono::seconds __s, chrono::nanoseconds __ns)
+ {
+ __gthread_time_t __ts =
+ {
+ static_cast<std::time_t>(__s.count()),
+ static_cast<long>(__ns.count())
+ };
+ ::nanosleep(&__ts, 0);
+ }
+#endif
+
/// sleep_for
template<typename _Rep, typename _Period>
inline void
sleep_for(const chrono::duration<_Rep, _Period>& __rtime)
{
- chrono::seconds __s =
- chrono::duration_cast<chrono::seconds>(__rtime);
-
- chrono::nanoseconds __ns =
- chrono::duration_cast<chrono::nanoseconds>(__rtime - __s);
-
- __gthread_time_t __ts =
- {
- static_cast<std::time_t>(__s.count()),
- static_cast<long>(__ns.count())
- };
-
- ::nanosleep(&__ts, 0);
+ auto __s = chrono::duration_cast<chrono::seconds>(__rtime);
+ auto __ns = chrono::duration_cast<chrono::nanoseconds>(__rtime - __s);
+ __sleep_for(__s, __ns);
}
/// sleep_until
@@ -282,7 +289,6 @@ _GLIBCXX_END_NAMESPACE_VERSION
inline void
sleep_until(const chrono::time_point<_Clock, _Duration>& __atime)
{ sleep_for(__atime - _Clock::now()); }
-#endif
_GLIBCXX_END_NAMESPACE_VERSION
}
diff --git a/libstdc++-v3/src/c++11/thread.cc b/libstdc++-v3/src/c++11/thread.cc
index 5c10832..90bd835 100644
--- a/libstdc++-v3/src/c++11/thread.cc
+++ b/libstdc++-v3/src/c++11/thread.cc
@@ -1,6 +1,6 @@
// thread -*- C++ -*-
-// Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2008-2012 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
@@ -27,6 +27,8 @@
#include <system_error>
#include <cerrno>
+#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
+
#if defined(_GLIBCXX_USE_GET_NPROCS)
# include <sys/sysinfo.h>
# define _GLIBCXX_NPROCS get_nprocs()
@@ -55,7 +57,13 @@ static inline int get_nprocs()
# define _GLIBCXX_NPROCS 0
#endif
-#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
+#ifndef _GLIBCXX_USE_NANOSLEEP
+# ifdef _GLIBCXX_USE_SLEEP
+# include <unistd.h>
+# else
+# error "No sleep function known for this target"
+# endif
+#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
@@ -142,6 +150,35 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
_GLIBCXX_END_NAMESPACE_VERSION
+
+namespace this_thread
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+#ifndef _GLIBCXX_USE_NANOSLEEP
+ void
+ __sleep_for(chrono::seconds __s, chrono::nanoseconds __ns)
+ {
+#ifdef _GLIBCXX_USE_SLEEP
+#ifdef _GLIBCXX_USE_USLEEP
+ ::sleep(__s.count());
+ if (__ns.count() > 0)
+ {
+ long __us = __ns.count() / 1000;
+ if (__us == 0)
+ __us = 1;
+ ::usleep(__us);
+ }
+#else
+ ::sleep(__s.count() + (__ns >= 1000000));
+#endif
+#endif
+ }
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+}
+
} // namespace std
#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
diff --git a/libstdc++-v3/testsuite/30_threads/condition_variable_any/53830.cc
b/libstdc++-v3/testsuite/30_threads/condition_variable_any/53830.cc
index 91aa348..a5279f6 100644
--- a/libstdc++-v3/testsuite/30_threads/condition_variable_any/53830.cc
+++ b/libstdc++-v3/testsuite/30_threads/condition_variable_any/53830.cc
@@ -5,7 +5,7 @@
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
// { dg-require-sched-yield "" }
-// { dg-require-nanosleep "" }
+// { dg-require-sleep "" }
// Copyright (C) 2012 Free Software Foundation, Inc.
//
diff --git a/libstdc++-v3/testsuite/30_threads/this_thread/2.cc
b/libstdc++-v3/testsuite/30_threads/this_thread/2.cc
index f6b4740..6f5dd0f 100644
--- a/libstdc++-v3/testsuite/30_threads/this_thread/2.cc
+++ b/libstdc++-v3/testsuite/30_threads/this_thread/2.cc
@@ -4,9 +4,8 @@
// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
-// { dg-require-sched-yield "" }
-// Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+// Copyright (C) 2008-2012 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
diff --git a/libstdc++-v3/testsuite/30_threads/this_thread/3.cc
b/libstdc++-v3/testsuite/30_threads/this_thread/3.cc
index b765f86..35f65f4 100644
--- a/libstdc++-v3/testsuite/30_threads/this_thread/3.cc
+++ b/libstdc++-v3/testsuite/30_threads/this_thread/3.cc
@@ -4,9 +4,9 @@
// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
-// { dg-require-nanosleep "" }
+// { dg-require-sleep "" }
-// Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+// Copyright (C) 2008-2012 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
diff --git a/libstdc++-v3/testsuite/30_threads/this_thread/4.cc
b/libstdc++-v3/testsuite/30_threads/this_thread/4.cc
index 2f8e27a..38a2a3c 100644
--- a/libstdc++-v3/testsuite/30_threads/this_thread/4.cc
+++ b/libstdc++-v3/testsuite/30_threads/this_thread/4.cc
@@ -4,9 +4,9 @@
// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
-// { dg-require-nanosleep "" }
+// { dg-require-sleep "" }
-// Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+// Copyright (C) 2008-2012 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
diff --git a/libstdc++-v3/testsuite/lib/dg-options.exp
b/libstdc++-v3/testsuite/lib/dg-options.exp
index 9d5624a..8a8a13f 100644
--- a/libstdc++-v3/testsuite/lib/dg-options.exp
+++ b/libstdc++-v3/testsuite/lib/dg-options.exp
@@ -143,8 +143,8 @@ proc dg-require-gthreads-timed { args } {
return
}
-proc dg-require-nanosleep { args } {
- if { ![ check_v3_target_nanosleep ] } {
+proc dg-require-sleep { args } {
+ if { ![ check_v3_target_sleep ] } {
upvar dg-do-what dg-do-what
set dg-do-what [list [lindex ${dg-do-what} 0] "N" "P"]
return
diff --git a/libstdc++-v3/testsuite/lib/libstdc++.exp
b/libstdc++-v3/testsuite/lib/libstdc++.exp
index 9a9e0cb..4ad6868 100644
--- a/libstdc++-v3/testsuite/lib/libstdc++.exp
+++ b/libstdc++-v3/testsuite/lib/libstdc++.exp
@@ -1352,41 +1352,43 @@ proc check_v3_target_gthreads_timed { } {
}
-proc check_v3_target_nanosleep { } {
+proc check_v3_target_sleep { } {
global cxxflags
global DEFAULT_CXXFLAGS
- global et_nanosleep
+ global et_sleep
global tool
- if { ![info exists et_nanosleep_target_name] } {
- set et_nanosleep_target_name ""
+ if { ![info exists et_sleep_target_name] } {
+ set et_sleep_target_name ""
}
# If the target has changed since we set the cached value, clear it.
set current_target [current_target_name]
- if { $current_target != $et_nanosleep_target_name } {
- verbose "check_v3_target_nanosleep: `$et_nanosleep_target_name'" 2
- set et_nanosleep_target_name $current_target
- if [info exists et_nanosleep] {
- verbose "check_v3_target_nanosleep: removing cached result" 2
- unset et_nanosleep
+ if { $current_target != $et_sleep_target_name } {
+ verbose "check_v3_target_sleep: `$et_sleep_target_name'" 2
+ set et_sleep_target_name $current_target
+ if [info exists et_sleep] {
+ verbose "check_v3_target_sleep: removing cached result" 2
+ unset et_sleep
}
}
- if [info exists et_nanosleep] {
- verbose "check_v3_target_nanosleep: using cached result" 2
+ if [info exists et_sleep] {
+ verbose "check_v3_target_sleep: using cached result" 2
} else {
- set et_nanosleep 0
+ set et_sleep 0
- # Set up and preprocess a C++0x test program that depends
- # on the nanosleep facilities to be available.
- set src nanosleep[pid].cc
+ # Set up and preprocess a C++11 test program that depends
+ # on the sleep facilities to be available.
+ set src sleep[pid].cc
set f [open $src "w"]
puts $f "#include <bits/c++config.h>"
puts $f "#ifndef _GLIBCXX_USE_NANOSLEEP"
- puts $f "# error No nanosleep"
+ puts $f "# ifndef _GLIBCXX_HAVE_SLEEP"
+ puts $f "# error No nanosleep or sleep"
+ puts $f "# endif"
puts $f "#endif"
close $f
@@ -1399,13 +1401,13 @@ proc check_v3_target_nanosleep { } {
if [string match "" $lines] {
# No error message, preprocessing succeeded.
- set et_nanosleep 1
+ set et_sleep 1
} else {
- verbose "check_v3_target_nanosleep: compilation failed" 2
+ verbose "check_v3_target_sleep: compilation failed" 2
}
}
- verbose "check_v3_target_nanosleep: $et_nanosleep" 2
- return $et_nanosleep
+ verbose "check_v3_target_sleep: $et_sleep" 2
+ return $et_sleep
}
proc check_v3_target_sched_yield { } {
