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Jonathan Wakely 749c0e1d8b PR libstdc++/59439 optimize uses of classic ("C") std::locale 
The global locale::_Impl that represents the "C" locale is never
destroyed, so there is no need to keep track of reference count updates
for that object. This greatly reduce contention between threads that
refer to the classic locale. Since the global std::locale initially uses
the classic locale, this benefits the common case for any code using the
global locale, such as construction/destruction of iostream objects.

All these updates are done inside libstdc++.so so there's no need to
worry about users' objects having inlined old versions of the code which
still update the reference count for the classic locale.

	PR libstdc++/59439
	* src/c++98/locale.cc (locale::locale(const locale&)): Bypass
	reference count updates for the classic locale.
	(locale::~locale()): Likewise.
	(locale::operator=(const locale&)): Likewise.
	* src/c++98/locale_init.cc (locale::locale()): Likewise.
	(locale::global(const locale&)): Likewise.

From-SVN: r264811
2018-10-03 12:27:40 +01:00
..
config config: Remove unused define for os uClibc 2018-10-02 14:35:42 +02:00
doc allocator.xml: Adjust link to "Reconsidering Custom Memory Allocation". 2018-10-01 15:17:15 +00:00
include 2018-10-03 François Dumont <fdumont@gcc.gnu.org> 2018-10-03 05:50:01 +00:00
libsupc++ * libsupc++/cxxabi.h (__cxa_demangle): Clarify doxygen comment. 2018-09-05 16:18:16 +01:00
po PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
python PR libstdc++/86963 Implement LWG 2729 constraints on tuple assignment 2018-08-17 18:52:49 +01:00
scripts Fix comments in testsuite script 2018-08-23 16:10:35 +01:00
src PR libstdc++/59439 optimize uses of classic ("C") std::locale 2018-10-03 12:27:40 +01:00
testsuite Use -fno-show-column in libstdc++ installed testing. 2018-10-02 13:46:32 +01:00
acinclude.m4 Add new src/c++17 directory to list in acinclude.m4 2018-07-25 12:01:39 +01:00
aclocal.m4 Build libgo with -Wa,-nH if possible (PR go/78978) [non-libgo parts] 2017-01-06 14:33:47 +00:00
ChangeLog PR libstdc++/59439 optimize uses of classic ("C") std::locale 2018-10-03 12:27:40 +01:00
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ChangeLog-2016 Update copyright years. 2017-01-01 13:07:43 +01:00
ChangeLog-2017 Update copyright years. 2018-01-03 11:03:58 +01:00
config.h.in Fix bootstrap failure for bare metal due to autoconf link tests 2018-06-18 17:01:24 +01:00
configure Revert "libstdc++-v3: Have aligned_alloc() on Newlib" 2018-08-13 19:54:21 +01:00
configure.ac Revert "libstdc++-v3: Have aligned_alloc() on Newlib" 2018-08-13 19:54:21 +01:00
configure.host Don't force visibility to hidden for Darwin > 8. 2018-08-25 09:02:28 +00:00
crossconfig.m4 crossconfig.m4: Handle OpenBSD just like NetBSD. 2018-06-18 11:28:53 -06:00
fragment.am PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
linkage.m4
Makefile.am Update copyright years. 2018-01-03 11:03:58 +01:00
Makefile.in PR libstdc++/86450 use -Wabi=2 and simplify -Werror use 2018-07-17 14:18:47 +01:00
README

README 

file: libstdc++-v3/README

New users may wish to point their web browsers to the file
index.html in the 'doc/html' subdirectory.  It contains brief
building instructions and notes on how to configure the library in
interesting ways.