e78f53d1e8
This reverts commit 68c04b0ae6.
This disables the IWYU mapping that caused the failure, since
the headers aren't reachable for now.
This is the first part of the "Freezing C++03 headers" proposal
explained in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58.
This patch mechanically copies the headers as of the LLVM 19.1 release
into a subdirectory of libc++ so that we can start using these headers
when building in C++03 mode. We are going to be backporting important
changes to that copy of the headers until the LLVM 21 release. After the
LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy
of the headers.
This patch only performs a copy of the headers -- these headers are
still unused by the rest of the codebase.
245 lines
8.7 KiB
C++
245 lines
8.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CONDITION_VARIABLE_CONDITION_VARIABLE_H
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#define _LIBCPP___CONDITION_VARIABLE_CONDITION_VARIABLE_H
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#include <__chrono/duration.h>
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#include <__chrono/steady_clock.h>
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#include <__chrono/system_clock.h>
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#include <__chrono/time_point.h>
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#include <__config>
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#include <__mutex/mutex.h>
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#include <__mutex/unique_lock.h>
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#include <__system_error/system_error.h>
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#include <__thread/support.h>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/is_floating_point.h>
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#include <__utility/move.h>
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#include <limits>
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#include <ratio>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#ifndef _LIBCPP_HAS_NO_THREADS
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// enum class cv_status
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_LIBCPP_DECLARE_STRONG_ENUM(cv_status){no_timeout, timeout};
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_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(cv_status)
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class _LIBCPP_EXPORTED_FROM_ABI condition_variable {
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__libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
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public:
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR condition_variable() _NOEXCEPT = default;
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# ifdef _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
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~condition_variable() = default;
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# else
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~condition_variable();
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# endif
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condition_variable(const condition_variable&) = delete;
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condition_variable& operator=(const condition_variable&) = delete;
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void notify_one() _NOEXCEPT;
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void notify_all() _NOEXCEPT;
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void wait(unique_lock<mutex>& __lk) _NOEXCEPT;
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template <class _Predicate>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS void wait(unique_lock<mutex>& __lk, _Predicate __pred);
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template <class _Clock, class _Duration>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS cv_status
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wait_until(unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t);
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template <class _Clock, class _Duration, class _Predicate>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS bool
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wait_until(unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t, _Predicate __pred);
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template <class _Rep, class _Period>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS cv_status
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wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d);
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template <class _Rep, class _Period, class _Predicate>
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bool _LIBCPP_HIDE_FROM_ABI
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wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d, _Predicate __pred);
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typedef __libcpp_condvar_t* native_handle_type;
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_LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() { return &__cv_; }
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private:
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void
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__do_timed_wait(unique_lock<mutex>& __lk, chrono::time_point<chrono::system_clock, chrono::nanoseconds>) _NOEXCEPT;
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# if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
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_LIBCPP_HIDE_FROM_ABI void
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__do_timed_wait(unique_lock<mutex>& __lk, chrono::time_point<chrono::steady_clock, chrono::nanoseconds>) _NOEXCEPT;
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# endif
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template <class _Clock>
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_LIBCPP_HIDE_FROM_ABI void
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__do_timed_wait(unique_lock<mutex>& __lk, chrono::time_point<_Clock, chrono::nanoseconds>) _NOEXCEPT;
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};
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#endif // !_LIBCPP_HAS_NO_THREADS
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template <class _Rep, class _Period, __enable_if_t<is_floating_point<_Rep>::value, int> = 0>
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inline _LIBCPP_HIDE_FROM_ABI chrono::nanoseconds __safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d) {
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using namespace chrono;
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using __ratio = ratio_divide<_Period, nano>;
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using __ns_rep = nanoseconds::rep;
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_Rep __result_float = __d.count() * __ratio::num / __ratio::den;
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_Rep __result_max = numeric_limits<__ns_rep>::max();
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if (__result_float >= __result_max) {
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return nanoseconds::max();
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}
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_Rep __result_min = numeric_limits<__ns_rep>::min();
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if (__result_float <= __result_min) {
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return nanoseconds::min();
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}
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return nanoseconds(static_cast<__ns_rep>(__result_float));
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}
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template <class _Rep, class _Period, __enable_if_t<!is_floating_point<_Rep>::value, int> = 0>
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inline _LIBCPP_HIDE_FROM_ABI chrono::nanoseconds __safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d) {
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using namespace chrono;
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if (__d.count() == 0) {
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return nanoseconds(0);
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}
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using __ratio = ratio_divide<_Period, nano>;
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using __ns_rep = nanoseconds::rep;
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__ns_rep __result_max = numeric_limits<__ns_rep>::max();
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if (__d.count() > 0 && __d.count() > __result_max / __ratio::num) {
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return nanoseconds::max();
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}
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__ns_rep __result_min = numeric_limits<__ns_rep>::min();
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if (__d.count() < 0 && __d.count() < __result_min / __ratio::num) {
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return nanoseconds::min();
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}
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__ns_rep __result = __d.count() * __ratio::num / __ratio::den;
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if (__result == 0) {
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return nanoseconds(1);
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}
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return nanoseconds(__result);
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}
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#ifndef _LIBCPP_HAS_NO_THREADS
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template <class _Predicate>
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void condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) {
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while (!__pred())
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wait(__lk);
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}
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template <class _Clock, class _Duration>
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cv_status condition_variable::wait_until(unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t) {
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using namespace chrono;
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using __clock_tp_ns = time_point<_Clock, nanoseconds>;
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typename _Clock::time_point __now = _Clock::now();
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if (__t <= __now)
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return cv_status::timeout;
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__clock_tp_ns __t_ns = __clock_tp_ns(std::__safe_nanosecond_cast(__t.time_since_epoch()));
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__do_timed_wait(__lk, __t_ns);
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return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
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}
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template <class _Clock, class _Duration, class _Predicate>
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bool condition_variable::wait_until(
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unique_lock<mutex>& __lk, const chrono::time_point<_Clock, _Duration>& __t, _Predicate __pred) {
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while (!__pred()) {
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if (wait_until(__lk, __t) == cv_status::timeout)
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return __pred();
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}
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return true;
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}
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template <class _Rep, class _Period>
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cv_status condition_variable::wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d) {
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using namespace chrono;
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if (__d <= __d.zero())
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return cv_status::timeout;
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using __ns_rep = nanoseconds::rep;
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steady_clock::time_point __c_now = steady_clock::now();
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# if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
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using __clock_tp_ns = time_point<steady_clock, nanoseconds>;
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__ns_rep __now_count_ns = std::__safe_nanosecond_cast(__c_now.time_since_epoch()).count();
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# else
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using __clock_tp_ns = time_point<system_clock, nanoseconds>;
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__ns_rep __now_count_ns = std::__safe_nanosecond_cast(system_clock::now().time_since_epoch()).count();
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# endif
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__ns_rep __d_ns_count = std::__safe_nanosecond_cast(__d).count();
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if (__now_count_ns > numeric_limits<__ns_rep>::max() - __d_ns_count) {
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__do_timed_wait(__lk, __clock_tp_ns::max());
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} else {
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__do_timed_wait(__lk, __clock_tp_ns(nanoseconds(__now_count_ns + __d_ns_count)));
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}
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return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : cv_status::timeout;
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}
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template <class _Rep, class _Period, class _Predicate>
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inline bool
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condition_variable::wait_for(unique_lock<mutex>& __lk, const chrono::duration<_Rep, _Period>& __d, _Predicate __pred) {
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return wait_until(__lk, chrono::steady_clock::now() + __d, std::move(__pred));
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}
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# if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
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inline void condition_variable::__do_timed_wait(
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unique_lock<mutex>& __lk, chrono::time_point<chrono::steady_clock, chrono::nanoseconds> __tp) _NOEXCEPT {
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using namespace chrono;
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if (!__lk.owns_lock())
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__throw_system_error(EPERM, "condition_variable::timed wait: mutex not locked");
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nanoseconds __d = __tp.time_since_epoch();
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timespec __ts;
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seconds __s = duration_cast<seconds>(__d);
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using __ts_sec = decltype(__ts.tv_sec);
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const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max();
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if (__s.count() < __ts_sec_max) {
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__ts.tv_sec = static_cast<__ts_sec>(__s.count());
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__ts.tv_nsec = (__d - __s).count();
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} else {
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__ts.tv_sec = __ts_sec_max;
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__ts.tv_nsec = giga::num - 1;
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}
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int __ec = pthread_cond_clockwait(&__cv_, __lk.mutex()->native_handle(), CLOCK_MONOTONIC, &__ts);
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if (__ec != 0 && __ec != ETIMEDOUT)
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__throw_system_error(__ec, "condition_variable timed_wait failed");
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}
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# endif // _LIBCPP_HAS_COND_CLOCKWAIT
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template <class _Clock>
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inline void condition_variable::__do_timed_wait(unique_lock<mutex>& __lk,
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chrono::time_point<_Clock, chrono::nanoseconds> __tp) _NOEXCEPT {
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wait_for(__lk, __tp - _Clock::now());
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}
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#endif // _LIBCPP_HAS_NO_THREADS
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___CONDITION_VARIABLE_CONDITION_VARIABLE_H
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