libstdc++: Add C++2a synchronization support

Add support for -
  * atomic_flag::wait/notify_one/notify_all
  * atomic::wait/notify_one/notify_all
  * counting_semaphore
  * binary_semaphore
  * latch

libstdc++-v3/ChangeLog:

	* include/Makefile.am (bits_headers): Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/atomic_base.h (__atomic_flag::wait): Define.
	(__atomic_flag::notify_one): Likewise.
	(__atomic_flag::notify_all): Likewise.
	(__atomic_base<_Itp>::wait): Likewise.
	(__atomic_base<_Itp>::notify_one): Likewise.
	(__atomic_base<_Itp>::notify_all): Likewise.
	(__atomic_base<_Ptp*>::wait): Likewise.
	(__atomic_base<_Ptp*>::notify_one): Likewise.
	(__atomic_base<_Ptp*>::notify_all): Likewise.
	(__atomic_impl::wait): Likewise.
	(__atomic_impl::notify_one): Likewise.
	(__atomic_impl::notify_all): Likewise.
	(__atomic_float<_Fp>::wait): Likewise.
	(__atomic_float<_Fp>::notify_one): Likewise.
	(__atomic_float<_Fp>::notify_all): Likewise.
	(__atomic_ref<_Tp>::wait): Likewise.
	(__atomic_ref<_Tp>::notify_one): Likewise.
	(__atomic_ref<_Tp>::notify_all): Likewise.
	(atomic_wait<_Tp>): Likewise.
	(atomic_wait_explicit<_Tp>): Likewise.
	(atomic_notify_one<_Tp>): Likewise.
	(atomic_notify_all<_Tp>): Likewise.
	* include/bits/atomic_wait.h: New file.
	* include/bits/atomic_timed_wait.h: New file.
	* include/bits/semaphore_base.h: New file.
	* include/std/atomic (atomic<bool>::wait): Define.
	(atomic<bool>::wait_one): Likewise.
	(atomic<bool>::wait_all): Likewise.
	(atomic<_Tp>::wait): Likewise.
	(atomic<_Tp>::wait_one): Likewise.
	(atomic<_Tp>::wait_all): Likewise.
	(atomic<_Tp*>::wait): Likewise.
	(atomic<_Tp*>::wait_one): Likewise.
	(atomic<_Tp*>::wait_all): Likewise.
	* include/std/latch: New file.
	* include/std/semaphore: New file.
	* include/std/version: Add __cpp_lib_semaphore and
	__cpp_lib_latch defines.
	* testsuite/29_atomics/atomic/wait_notify/bool.cc: New test.
	* testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
	* testsuite/29_atomics/atomic/wait_notify/generic.cc: Liekwise.
	* testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
	* testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.
	* testsuite/30_threads/semaphore/1.cc: New test.
	* testsuite/30_threads/semaphore/2.cc: Likewise.
	* testsuite/30_threads/semaphore/least_max_value_neg.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_for.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_posix.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
	* testsuite/30_threads/latch/1.cc: New test.
	* testsuite/30_threads/latch/2.cc: New test.
	* testsuite/30_threads/latch/3.cc: New test.
	* testsuite/util/atomic/wait_notify_util.h: New File.

1 files changed, 5 insertions, 0 deletions

diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index dfa72b95547..ef2dc18965b 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -398,6 +398,7 @@ std_headers = \
 	${std_srcdir}/iostream \
 	${std_srcdir}/istream \
 	${std_srcdir}/iterator \
+	${std_srcdir}/latch \
 	${std_srcdir}/limits \
 	${std_srcdir}/list \
 	${std_srcdir}/locale \
@@ -415,6 +416,7 @@ std_headers = \
 	${std_srcdir}/ratio \
 	${std_srcdir}/regex \
 	${std_srcdir}/scoped_allocator \
+	${std_srcdir}/semaphore \
 	${std_srcdir}/set \
 	${std_srcdir}/shared_mutex \
 	${std_srcdir}/span \
@@ -449,6 +451,8 @@ bits_headers = \
 	${bits_srcdir}/allocator.h \
 	${bits_srcdir}/atomic_base.h \
 	${bits_srcdir}/atomic_futex.h \
+	${bits_srcdir}/atomic_timed_wait.h \
+	${bits_srcdir}/atomic_wait.h \
 	${bits_srcdir}/basic_ios.h \
 	${bits_srcdir}/basic_ios.tcc \
 	${bits_srcdir}/basic_string.h \
@@ -524,6 +528,7 @@ bits_headers = \
 	${bits_srcdir}/regex_compiler.tcc \
 	${bits_srcdir}/regex_executor.h \
 	${bits_srcdir}/regex_executor.tcc \
+	${bits_srcdir}/semaphore_base.h \
 	${bits_srcdir}/shared_ptr.h \
 	${bits_srcdir}/shared_ptr_atomic.h \
 	${bits_srcdir}/shared_ptr_base.h \