Update libc++ to 429a717e (20 Jan 2022).

Notable changes:
* use _LIBCPP_DEBUG_ASSERT in unordered_map and vector headers
* use reserved identifiers for template parameters
* fix category of fs::path::iterator
* introduce __debug_db_insert_i() for debug checks to support compile-time evaluation
* add specializations of basic_common_reference and common_type for tuple
* fix std::lognormal_distribution::param_type
* add _LIBCPP_HIDE_FROM_ABI to in_in_result conversion operators
* replace _LIBCPP_INLINE_VISIBILITY with _LIBCPP_HIDE_FROM_ABI in move_iterator.h
* fix __simple_view concept in std::ranges
* add some ASCII/EBCDIC support for z/OS

ref:b0e68cbe142a3f06a8804f247119b5eb0a455a39

1 files changed, 2 insertions, 51 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__threading_support b/contrib/libs/cxxsupp/libcxx/include/__threading_support
index 89ea4a91698..b4675aadf07 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__threading_support
+++ b/contrib/libs/cxxsupp/libcxx/include/__threading_support
@@ -56,9 +56,6 @@
 typedef ::timespec __libcpp_timespec_t;
 #endif // !defined(_LIBCPP_HAS_NO_THREADS)
 
-_LIBCPP_PUSH_MACROS
-#include <__undef_macros>
-
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 #if !defined(_LIBCPP_HAS_NO_THREADS)
@@ -254,53 +251,9 @@ int __libcpp_tls_set(__libcpp_tls_key __key, void *__p);
 
 #endif // !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
 
-struct __libcpp_timed_backoff_policy {
-  _LIBCPP_INLINE_VISIBILITY
-  bool operator()(chrono::nanoseconds __elapsed) const
-  {
-      if(__elapsed > chrono::milliseconds(128))
-          __libcpp_thread_sleep_for(chrono::milliseconds(8));
-      else if(__elapsed > chrono::microseconds(64))
-          __libcpp_thread_sleep_for(__elapsed / 2);
-      else if(__elapsed > chrono::microseconds(4))
-        __libcpp_thread_yield();
-      else
-        {} // poll
-      return false;
-  }
-};
-
 #if (!defined(_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL) || \
      defined(_LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL))
 
-
-namespace __thread_detail {
-
-_LIBCPP_HIDE_FROM_ABI inline
-__libcpp_timespec_t __convert_to_timespec(const chrono::nanoseconds& __ns)
-{
-  using namespace chrono;
-  seconds __s = duration_cast<seconds>(__ns);
-  __libcpp_timespec_t __ts;
-  typedef decltype(__ts.tv_sec) __ts_sec;
-  const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max();
-
-  if (__s.count() < __ts_sec_max)
-  {
-    __ts.tv_sec = static_cast<__ts_sec>(__s.count());
-    __ts.tv_nsec = static_cast<decltype(__ts.tv_nsec)>((__ns - __s).count());
-  }
-  else
-  {
-    __ts.tv_sec = __ts_sec_max;
-    __ts.tv_nsec = 999999999; // (10^9 - 1)
-  }
-
-  return __ts;
-}
-
-} // namespace __thread_detail
-
 #if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
 
 _LIBCPP_HIDE_FROM_ABI inline
@@ -481,7 +434,7 @@ void __libcpp_thread_yield()
 _LIBCPP_HIDE_FROM_ABI inline
 void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns)
 {
-   __libcpp_timespec_t __ts = __thread_detail::__convert_to_timespec(__ns);
+   __libcpp_timespec_t __ts = _VSTD::__convert_to_timespec<__libcpp_timespec_t>(__ns);
    while (nanosleep(&__ts, &__ts) == -1 && errno == EINTR);
 }
 
@@ -666,7 +619,7 @@ void __libcpp_thread_yield()
 _LIBCPP_HIDE_FROM_ABI inline
 void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns)
 {
-   __libcpp_timespec_t __ts = __thread_detail::__convert_to_timespec(__ns);
+   __libcpp_timespec_t __ts = _VSTD::__convert_to_timespec<__libcpp_timespec_t>(__ns);
   thrd_sleep(&__ts, nullptr);
 }
 
@@ -778,6 +731,4 @@ get_id() _NOEXCEPT
 
 _LIBCPP_END_NAMESPACE_STD
 
-_LIBCPP_POP_MACROS
-
 #endif // _LIBCPP_THREADING_SUPPORT