mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-28 19:16:05 +00:00
368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
530 lines
16 KiB
C++
530 lines
16 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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___MUTEX_BASE
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#define _LIBCPP___MUTEX_BASE
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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 <__threading_support>
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#include <ratio>
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#include <system_error>
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#include <time.h>
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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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class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex
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{
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__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
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public:
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR mutex() = default;
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mutex(const mutex&) = delete;
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mutex& operator=(const mutex&) = delete;
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#if defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
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~mutex() = default;
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#else
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~mutex() _NOEXCEPT;
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#endif
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void lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability());
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bool try_lock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(try_acquire_capability(true));
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void unlock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability());
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typedef __libcpp_mutex_t* native_handle_type;
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_LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;}
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};
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static_assert(is_nothrow_default_constructible<mutex>::value,
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"the default constructor for std::mutex must be nothrow");
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struct _LIBCPP_TYPE_VIS defer_lock_t { explicit defer_lock_t() = default; };
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struct _LIBCPP_TYPE_VIS try_to_lock_t { explicit try_to_lock_t() = default; };
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struct _LIBCPP_TYPE_VIS adopt_lock_t { explicit adopt_lock_t() = default; };
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#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
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extern _LIBCPP_EXPORTED_FROM_ABI const defer_lock_t defer_lock;
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extern _LIBCPP_EXPORTED_FROM_ABI const try_to_lock_t try_to_lock;
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extern _LIBCPP_EXPORTED_FROM_ABI const adopt_lock_t adopt_lock;
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#else
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/* inline */ constexpr defer_lock_t defer_lock = defer_lock_t();
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/* inline */ constexpr try_to_lock_t try_to_lock = try_to_lock_t();
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/* inline */ constexpr adopt_lock_t adopt_lock = adopt_lock_t();
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#endif
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template <class _Mutex>
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class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable)
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lock_guard
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{
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public:
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typedef _Mutex mutex_type;
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private:
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mutex_type& __m_;
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public:
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_LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
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explicit lock_guard(mutex_type& __m) _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
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: __m_(__m) {__m_.lock();}
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_LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
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lock_guard(mutex_type& __m, adopt_lock_t) _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
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: __m_(__m) {}
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_LIBCPP_INLINE_VISIBILITY
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~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) {__m_.unlock();}
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private:
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lock_guard(lock_guard const&) = delete;
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lock_guard& operator=(lock_guard const&) = delete;
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};
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template <class _Mutex>
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class _LIBCPP_TEMPLATE_VIS unique_lock
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{
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public:
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typedef _Mutex mutex_type;
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private:
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mutex_type* __m_;
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bool __owns_;
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public:
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_LIBCPP_INLINE_VISIBILITY
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unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit unique_lock(mutex_type& __m)
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: __m_(_VSTD::addressof(__m)), __owns_(true) {__m_->lock();}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT
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: __m_(_VSTD::addressof(__m)), __owns_(false) {}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, try_to_lock_t)
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: __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock()) {}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, adopt_lock_t)
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: __m_(_VSTD::addressof(__m)), __owns_(true) {}
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template <class _Clock, class _Duration>
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
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: __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock_until(__t)) {}
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template <class _Rep, class _Period>
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
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: __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock_for(__d)) {}
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_LIBCPP_INLINE_VISIBILITY
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~unique_lock()
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{
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if (__owns_)
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__m_->unlock();
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}
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unique_lock(unique_lock const&) = delete;
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unique_lock& operator=(unique_lock const&) = delete;
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(unique_lock&& __u) _NOEXCEPT
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: __m_(__u.__m_), __owns_(__u.__owns_)
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{__u.__m_ = nullptr; __u.__owns_ = false;}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock& operator=(unique_lock&& __u) _NOEXCEPT
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{
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if (__owns_)
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__m_->unlock();
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__m_ = __u.__m_;
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__owns_ = __u.__owns_;
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__u.__m_ = nullptr;
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__u.__owns_ = false;
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return *this;
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}
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void lock();
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bool try_lock();
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template <class _Rep, class _Period>
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bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
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template <class _Clock, class _Duration>
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bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
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void unlock();
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_LIBCPP_INLINE_VISIBILITY
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void swap(unique_lock& __u) _NOEXCEPT
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{
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_VSTD::swap(__m_, __u.__m_);
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_VSTD::swap(__owns_, __u.__owns_);
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}
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_LIBCPP_INLINE_VISIBILITY
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mutex_type* release() _NOEXCEPT
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{
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mutex_type* __m = __m_;
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__m_ = nullptr;
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__owns_ = false;
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return __m;
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}
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_LIBCPP_INLINE_VISIBILITY
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bool owns_lock() const _NOEXCEPT {return __owns_;}
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_LIBCPP_INLINE_VISIBILITY
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explicit operator bool() const _NOEXCEPT {return __owns_;}
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_LIBCPP_INLINE_VISIBILITY
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mutex_type* mutex() const _NOEXCEPT {return __m_;}
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};
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template <class _Mutex>
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void
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unique_lock<_Mutex>::lock()
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::lock: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::lock: already locked");
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__m_->lock();
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__owns_ = true;
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}
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template <class _Mutex>
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bool
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unique_lock<_Mutex>::try_lock()
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
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__owns_ = __m_->try_lock();
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return __owns_;
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}
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template <class _Mutex>
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template <class _Rep, class _Period>
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bool
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unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
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__owns_ = __m_->try_lock_for(__d);
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return __owns_;
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}
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template <class _Mutex>
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template <class _Clock, class _Duration>
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bool
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unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
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__owns_ = __m_->try_lock_until(__t);
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return __owns_;
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}
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template <class _Mutex>
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void
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unique_lock<_Mutex>::unlock()
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{
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if (!__owns_)
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__throw_system_error(EPERM, "unique_lock::unlock: not locked");
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__m_->unlock();
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__owns_ = false;
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}
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template <class _Mutex>
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inline _LIBCPP_INLINE_VISIBILITY
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void
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swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT
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{__x.swap(__y);}
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//enum class cv_status
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_LIBCPP_DECLARE_STRONG_ENUM(cv_status)
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{
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no_timeout,
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timeout
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};
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_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(cv_status)
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class _LIBCPP_TYPE_VIS condition_variable
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{
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__libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
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public:
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_LIBCPP_INLINE_VISIBILITY
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_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
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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
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cv_status
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wait_until(unique_lock<mutex>& __lk,
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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
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bool
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wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t,
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_Predicate __pred);
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template <class _Rep, class _Period>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
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cv_status
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wait_for(unique_lock<mutex>& __lk,
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const chrono::duration<_Rep, _Period>& __d);
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template <class _Rep, class _Period, class _Predicate>
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bool
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_LIBCPP_INLINE_VISIBILITY
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wait_for(unique_lock<mutex>& __lk,
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const chrono::duration<_Rep, _Period>& __d,
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_Predicate __pred);
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typedef __libcpp_condvar_t* native_handle_type;
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_LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;}
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private:
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void __do_timed_wait(unique_lock<mutex>& __lk,
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chrono::time_point<chrono::system_clock, chrono::nanoseconds>) _NOEXCEPT;
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#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
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void __do_timed_wait(unique_lock<mutex>& __lk,
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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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void __do_timed_wait(unique_lock<mutex>& __lk,
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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>
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inline _LIBCPP_INLINE_VISIBILITY
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typename enable_if
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<
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is_floating_point<_Rep>::value,
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chrono::nanoseconds
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>::type
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__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d)
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{
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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>
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inline _LIBCPP_INLINE_VISIBILITY
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typename enable_if
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<
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!is_floating_point<_Rep>::value,
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chrono::nanoseconds
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>::type
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__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d)
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{
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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
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condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred)
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{
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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
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condition_variable::wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t)
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{
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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(_VSTD::__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
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condition_variable::wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t,
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_Predicate __pred)
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{
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while (!__pred())
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{
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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
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condition_variable::wait_for(unique_lock<mutex>& __lk,
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const chrono::duration<_Rep, _Period>& __d)
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{
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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 = _VSTD::__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 = _VSTD::__safe_nanosecond_cast(system_clock::now().time_since_epoch()).count();
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#endif
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__ns_rep __d_ns_count = _VSTD::__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;
|
|
}
|
|
|
|
template <class _Rep, class _Period, class _Predicate>
|
|
inline
|
|
bool
|
|
condition_variable::wait_for(unique_lock<mutex>& __lk,
|
|
const chrono::duration<_Rep, _Period>& __d,
|
|
_Predicate __pred)
|
|
{
|
|
return wait_until(__lk, chrono::steady_clock::now() + __d,
|
|
_VSTD::move(__pred));
|
|
}
|
|
|
|
#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
|
|
inline
|
|
void
|
|
condition_variable::__do_timed_wait(unique_lock<mutex>& __lk,
|
|
chrono::time_point<chrono::steady_clock, chrono::nanoseconds> __tp) _NOEXCEPT
|
|
{
|
|
using namespace chrono;
|
|
if (!__lk.owns_lock())
|
|
__throw_system_error(EPERM,
|
|
"condition_variable::timed wait: mutex not locked");
|
|
nanoseconds __d = __tp.time_since_epoch();
|
|
timespec __ts;
|
|
seconds __s = duration_cast<seconds>(__d);
|
|
using __ts_sec = decltype(__ts.tv_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 = (__d - __s).count();
|
|
}
|
|
else
|
|
{
|
|
__ts.tv_sec = __ts_sec_max;
|
|
__ts.tv_nsec = giga::num - 1;
|
|
}
|
|
int __ec = pthread_cond_clockwait(&__cv_, __lk.mutex()->native_handle(), CLOCK_MONOTONIC, &__ts);
|
|
if (__ec != 0 && __ec != ETIMEDOUT)
|
|
__throw_system_error(__ec, "condition_variable timed_wait failed");
|
|
}
|
|
#endif // _LIBCPP_HAS_COND_CLOCKWAIT
|
|
|
|
template <class _Clock>
|
|
inline
|
|
void
|
|
condition_variable::__do_timed_wait(unique_lock<mutex>& __lk,
|
|
chrono::time_point<_Clock, chrono::nanoseconds> __tp) _NOEXCEPT
|
|
{
|
|
wait_for(__lk, __tp - _Clock::now());
|
|
}
|
|
|
|
#endif // !_LIBCPP_HAS_NO_THREADS
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___MUTEX_BASE
|