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// Copyright Oliver Kowalke 2016. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_FIBERS_UNBUFFERED_CHANNEL_H #define BOOST_FIBERS_UNBUFFERED_CHANNEL_H #include #include #include #include #include #include #include #include #include #include #include #if defined(BOOST_NO_CXX14_STD_EXCHANGE) #include #endif #include #include #include #ifdef BOOST_HAS_ABI_HEADERS # include BOOST_ABI_PREFIX #endif namespace boost { namespace fibers { template< typename T > class unbuffered_channel { public: using value_type = typename std::remove_reference::type; private: struct slot { value_type value; waker w; slot( value_type const& value_, waker && w) : value{ value_ }, w{ std::move(w) } { } slot( value_type && value_, waker && w) : value{ std::move( value_) }, w{ std::move(w) } { } }; // shared cacheline std::atomic< slot * > slot_{ nullptr }; // shared cacheline std::atomic_bool closed_{ false }; mutable detail::spinlock splk_producers_{}; wait_queue waiting_producers_{}; mutable detail::spinlock splk_consumers_{}; wait_queue waiting_consumers_{}; char pad_[cacheline_length]; bool is_empty_() { return nullptr == slot_.load( std::memory_order_acquire); } bool try_push_( slot * own_slot) { for (;;) { slot * s = slot_.load( std::memory_order_acquire); if ( nullptr == s) { if ( ! slot_.compare_exchange_strong( s, own_slot, std::memory_order_acq_rel) ) { continue; } return true; } return false; } } slot * try_pop_() { slot * nil_slot = nullptr; for (;;) { slot * s = slot_.load( std::memory_order_acquire); if ( nullptr != s) { if ( ! slot_.compare_exchange_strong( s, nil_slot, std::memory_order_acq_rel) ) { continue;} } return s; } } public: unbuffered_channel() = default; ~unbuffered_channel() { close(); } unbuffered_channel( unbuffered_channel const&) = delete; unbuffered_channel & operator=( unbuffered_channel const&) = delete; bool is_closed() const noexcept { return closed_.load( std::memory_order_acquire); } void close() noexcept { // set flag if ( ! closed_.exchange( true, std::memory_order_acquire) ) { // notify current waiting slot * s = slot_.load( std::memory_order_acquire); if ( nullptr != s) { // notify context s->w.wake(); } detail::spinlock_lock lk1{ splk_producers_ }; waiting_producers_.notify_all(); detail::spinlock_lock lk2{ splk_consumers_ }; waiting_consumers_.notify_all(); } } channel_op_status push( value_type const& value) { context * active_ctx = context::active(); slot s{ value, {} }; for (;;) { if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } s.w = active_ctx->create_waker(); if ( try_push_( & s) ) { detail::spinlock_lock lk{ splk_consumers_ }; waiting_consumers_.notify_one(); // suspend till value has been consumed active_ctx->suspend( lk); // resumed if ( BOOST_UNLIKELY( is_closed() ) ) { // channel was closed before value was consumed return channel_op_status::closed; } // value has been consumed return channel_op_status::success; } detail::spinlock_lock lk{ splk_producers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } if ( is_empty_() ) { continue; } waiting_producers_.suspend_and_wait( lk, active_ctx); // resumed, slot mabye free } } channel_op_status push( value_type && value) { context * active_ctx = context::active(); slot s{ std::move( value), {} }; for (;;) { if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } s.w = active_ctx->create_waker(); if ( try_push_( & s) ) { detail::spinlock_lock lk{ splk_consumers_ }; waiting_consumers_.notify_one(); // suspend till value has been consumed active_ctx->suspend( lk); // resumed if ( BOOST_UNLIKELY( is_closed() ) ) { // channel was closed before value was consumed return channel_op_status::closed; } // value has been consumed return channel_op_status::success; } detail::spinlock_lock lk{ splk_producers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } if ( is_empty_() ) { continue; } waiting_producers_.suspend_and_wait( lk, active_ctx); // resumed, slot mabye free } } template< typename Rep, typename Period > channel_op_status push_wait_for( value_type const& value, std::chrono::duration< Rep, Period > const& timeout_duration) { return push_wait_until( value, std::chrono::steady_clock::now() + timeout_duration); } template< typename Rep, typename Period > channel_op_status push_wait_for( value_type && value, std::chrono::duration< Rep, Period > const& timeout_duration) { return push_wait_until( std::forward< value_type >( value), std::chrono::steady_clock::now() + timeout_duration); } template< typename Clock, typename Duration > channel_op_status push_wait_until( value_type const& value, std::chrono::time_point< Clock, Duration > const& timeout_time_) { context * active_ctx = context::active(); slot s{ value, {} }; std::chrono::steady_clock::time_point timeout_time = detail::convert( timeout_time_); for (;;) { if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } s.w = active_ctx->create_waker(); if ( try_push_( & s) ) { detail::spinlock_lock lk{ splk_consumers_ }; waiting_consumers_.notify_one(); // suspend this producer if ( ! active_ctx->wait_until(timeout_time, lk, waker(s.w))) { // clear slot slot * nil_slot = nullptr, * own_slot = & s; slot_.compare_exchange_strong( own_slot, nil_slot, std::memory_order_acq_rel); // resumed, value has not been consumed return channel_op_status::timeout; } // resumed if ( BOOST_UNLIKELY( is_closed() ) ) { // channel was closed before value was consumed return channel_op_status::closed; } // value has been consumed return channel_op_status::success; } detail::spinlock_lock lk{ splk_producers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } if ( is_empty_() ) { continue; } if (! waiting_producers_.suspend_and_wait_until( lk, active_ctx, timeout_time)) { return channel_op_status::timeout; } // resumed, slot maybe free } } template< typename Clock, typename Duration > channel_op_status push_wait_until( value_type && value, std::chrono::time_point< Clock, Duration > const& timeout_time_) { context * active_ctx = context::active(); slot s{ std::move( value), {} }; std::chrono::steady_clock::time_point timeout_time = detail::convert( timeout_time_); for (;;) { if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } s.w = active_ctx->create_waker(); if ( try_push_( & s) ) { detail::spinlock_lock lk{ splk_consumers_ }; waiting_consumers_.notify_one(); // suspend this producer if ( ! active_ctx->wait_until(timeout_time, lk, waker(s.w))) { // clear slot slot * nil_slot = nullptr, * own_slot = & s; slot_.compare_exchange_strong( own_slot, nil_slot, std::memory_order_acq_rel); // resumed, value has not been consumed return channel_op_status::timeout; } // resumed if ( BOOST_UNLIKELY( is_closed() ) ) { // channel was closed before value was consumed return channel_op_status::closed; } // value has been consumed return channel_op_status::success; } detail::spinlock_lock lk{ splk_producers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } if ( is_empty_() ) { continue; } if (! waiting_producers_.suspend_and_wait_until( lk, active_ctx, timeout_time)) { return channel_op_status::timeout; } // resumed, slot maybe free } } channel_op_status pop( value_type & value) { context * active_ctx = context::active(); slot * s = nullptr; for (;;) { if ( nullptr != ( s = try_pop_() ) ) { { detail::spinlock_lock lk{ splk_producers_ }; waiting_producers_.notify_one(); } value = std::move( s->value); // notify context s->w.wake(); return channel_op_status::success; } detail::spinlock_lock lk{ splk_consumers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } if ( ! is_empty_() ) { continue; } waiting_consumers_.suspend_and_wait( lk, active_ctx); // resumed, slot mabye set } } value_type value_pop() { context * active_ctx = context::active(); slot * s = nullptr; for (;;) { if ( nullptr != ( s = try_pop_() ) ) { { detail::spinlock_lock lk{ splk_producers_ }; waiting_producers_.notify_one(); } // consume value value_type value = std::move( s->value); // notify context s->w.wake(); return std::move( value); } detail::spinlock_lock lk{ splk_consumers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { throw fiber_error{ std::make_error_code( std::errc::operation_not_permitted), "boost fiber: channel is closed" }; } if ( ! is_empty_() ) { continue; } waiting_consumers_.suspend_and_wait( lk, active_ctx); // resumed, slot mabye set } } template< typename Rep, typename Period > channel_op_status pop_wait_for( value_type & value, std::chrono::duration< Rep, Period > const& timeout_duration) { return pop_wait_until( value, std::chrono::steady_clock::now() + timeout_duration); } template< typename Clock, typename Duration > channel_op_status pop_wait_until( value_type & value, std::chrono::time_point< Clock, Duration > const& timeout_time_) { context * active_ctx = context::active(); slot * s = nullptr; std::chrono::steady_clock::time_point timeout_time = detail::convert( timeout_time_); for (;;) { if ( nullptr != ( s = try_pop_() ) ) { { detail::spinlock_lock lk{ splk_producers_ }; waiting_producers_.notify_one(); } // consume value value = std::move( s->value); // notify context s->w.wake(); return channel_op_status::success; } detail::spinlock_lock lk{ splk_consumers_ }; if ( BOOST_UNLIKELY( is_closed() ) ) { return channel_op_status::closed; } if ( ! is_empty_() ) { continue; } if ( ! waiting_consumers_.suspend_and_wait_until( lk, active_ctx, timeout_time)) { return channel_op_status::timeout; } } } class iterator { private: typedef typename std::aligned_storage< sizeof( value_type), alignof( value_type) >::type storage_type; unbuffered_channel * chan_{ nullptr }; storage_type storage_; void increment_( bool initial = false) { BOOST_ASSERT( nullptr != chan_); try { if ( ! initial) { reinterpret_cast< value_type * >( std::addressof( storage_) )->~value_type(); } ::new ( static_cast< void * >( std::addressof( storage_) ) ) value_type{ chan_->value_pop() }; } catch ( fiber_error const&) { chan_ = nullptr; } } public: using iterator_category = std::input_iterator_tag; using difference_type = std::ptrdiff_t; using pointer = value_type *; using reference = value_type &; using pointer_t = pointer; using reference_t = reference; iterator() = default; explicit iterator( unbuffered_channel< T > * chan) noexcept : chan_{ chan } { increment_( true); } iterator( iterator const& other) noexcept : chan_{ other.chan_ } { } iterator & operator=( iterator const& other) noexcept { if ( this == & other) return * this; chan_ = other.chan_; return * this; } bool operator==( iterator const& other) const noexcept { return other.chan_ == chan_; } bool operator!=( iterator const& other) const noexcept { return other.chan_ != chan_; } iterator & operator++() { reinterpret_cast< value_type * >( std::addressof( storage_) )->~value_type(); increment_(); return * this; } const iterator operator++( int) = delete; reference_t operator*() noexcept { return * reinterpret_cast< value_type * >( std::addressof( storage_) ); } pointer_t operator->() noexcept { return reinterpret_cast< value_type * >( std::addressof( storage_) ); } }; friend class iterator; }; template< typename T > typename unbuffered_channel< T >::iterator begin( unbuffered_channel< T > & chan) { return typename unbuffered_channel< T >::iterator( & chan); } template< typename T > typename unbuffered_channel< T >::iterator end( unbuffered_channel< T > &) { return typename unbuffered_channel< T >::iterator(); } }} #ifdef BOOST_HAS_ABI_HEADERS # include BOOST_ABI_SUFFIX #endif #endif // BOOST_FIBERS_UNBUFFERED_CHANNEL_H