re PR libstdc++/24704 (__gnu_cxx::__exchange_and_add is called even for single threaded applications)

2006-05-24  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/24704
	* include/bits/atomicity.h (__exchange_and_add_single,
	__atomic_add_single): New, single thread versions of the atomic
	functions.
	(__exchange_and_add_dispatch, __atomic_add_dispatch): New,
	depending on __GTHREADS and __gthread_active_p() dispatch either
	to the above or to the existing atomic functions.
	* include/ext/pool_allocator.h: Update callers.
	* include/ext/rc_string_base.h: Likewise.
	* include/bits/locale_classes.h: Likewise.
	* include/bits/basic_string.h: Likewise.
	* include/bits/ios_base.h: Likewise.
	* include/tr1/boost_shared_ptr.h: Likewise.
	* src/ios.cc: Likewise.
	* src/locale.cc: Likewise.
	* src/ios_init.cc: Likewise.

From-SVN: r114044