Coroutines (C++20) Tháng Chín 20, 2023 Tháng Chín 20, 2023 Trần Thu Uyên Video c->co</figcaption></figure> <p>A coroutine is a function that can suspend execution to be resumed later. Coroutines are stackless: they suspend execution by returning to the caller and the data that is required to resume execution is stored separately from the stack. This allows for sequential code that executes asynchronously (e.g. to handle non-blocking I/O without explicit callbacks), and also supports algorithms on lazy-computed infinite sequences and other uses. </p><div class='bvlienquan' style='padding: 20px; background: #e9ebec;'><strong>Có thể bạn quan tâm</strong><ul> <li><a target="_blank" href="https://asec.edu.vn/br2-mau-gi/" rel="bookmark" title="Những điều thú vị xoay quanh nguyên tố brom">Những điều thú vị xoay quanh nguyên tố brom</a></li> <li><a target="_blank" href="https://asec.edu.vn/fecl2-na2co3/" rel="bookmark" title=""></a></li> <li><a target="_blank" href="https://asec.edu.vn/hno3-ra-cuno32/" rel="bookmark" title="Hoannguyenvi">Hoannguyenvi</a></li> <li><a target="_blank" href="https://asec.edu.vn/baco3-hno3/" rel="bookmark" title="The Chemistry Behind HNO3 + BaCO3: 15 Facts You Should Know!">The Chemistry Behind HNO3 + BaCO3: 15 Facts You Should Know!</a></li> <li><a target="_blank" href="https://asec.edu.vn/feso4-k2cr2o7-h2so4/" rel="bookmark" title="K2Cr2O7 + FeSO4 + H2SO4 = Cr2(SO4)3 + Fe2(SO4)3 + K2SO4 + H2O">K2Cr2O7 + FeSO4 + H2SO4 = Cr2(SO4)3 + Fe2(SO4)3 + K2SO4 + H2O</a></li> </ul></div> <p>A function is a coroutine if its definition contains any of the following: </p><p class="internal-link" style="padding: 20px; background: #e9ebec;">Bạn đang xem: <a href="https://asec.edu.vn/c-co/">Coroutines (C++20)</a></p> <ul> <li> the co_await expression — to suspend execution until resumed </li> </ul> <ul> <li> the co_yield expression — to suspend execution returning a value </li> </ul> <ul> <li> the co_return statement — to complete execution returning a value </li> </ul> <p>Every coroutine must have a return type that satisfies a number of requirements, noted below. </p> <ul> <li>1 Restrictions</li> <li>2 Execution</li> <li>3 Dynamic allocation</li> <li>4 Promise</li> <li>5 co_await</li> <li>6 Example</li> <li>7 co_yield</li> <li>8 Notes</li> <li>9 Library support</li> <li>10 See also</li> <li>11 External links</li> </ul> <h3>[edit] Restrictions</h3> <p>Coroutines cannot use variadic arguments, plain return statements, or placeholder return types (auto or Concept). </p> <p>Consteval functions, constexpr functions, constructors, destructors, and the main function cannot be coroutines. </p> <h3>[edit] Execution</h3> <p>Each coroutine is associated with </p> <ul> <li> the <i>promise object</i>, manipulated from inside the coroutine. The coroutine submits its result or exception through this object. </li> <li> the <i>coroutine handle</i>, manipulated from outside the coroutine. This is a non-owning handle used to resume execution of the coroutine or to destroy the coroutine frame. </li> <li> the <i>coroutine state</i>, which is internal, dynamically-allocated storage (unless the allocation is optimized out), object that contains </li> </ul> <ul> <li> the promise object </li> <li> the parameters (all copied by value) </li> <li> some representation of the current suspension point, so that a resume knows where to continue, and a destroy knows what local variables were in scope </li> <li> local variables and temporaries whose lifetime spans the current suspension point. </li> </ul> <p>When a coroutine begins execution, it performs the following: </p> <ul> <li> allocates the coroutine state object using operator new. </li> <li> copies all function parameters to the coroutine state: by-value parameters are moved or copied, by-reference parameters remain references (thus, may become dangling, if the coroutine is resumed after the lifetime of referred object ends — see below for examples). </li> <li> calls the constructor for the promise object. If the promise type has a constructor that takes all coroutine parameters, that constructor is called, with post-copy coroutine arguments. Otherwise the default constructor is called. </li> <li> calls promise.get_return_object() and keeps the result in a local variable. The result of that call will be returned to the caller when the coroutine first suspends. Any exceptions thrown up to and including this step propagate back to the caller, not placed in the promise. </li> <li> calls promise.initial_suspend() and co_awaits its result. Typical Promise types either return a std::suspend_always, for lazily-started coroutines, or std::suspend_never, for eagerly-started coroutines. </li> <li> when co_await promise.initial_suspend() resumes, starts executing the body of the coroutine. </li> </ul> <p>Some examples of a parameter becoming dangling: </p> <div style="clear:both; margin-top:0em; margin-bottom:1em;"><a href="https://asec.edu.vn/suc-mot-khi-vao-nuoc-brom-thay-nuoc-brom-bi-nhat-mau-khi-do-la/" target="_blank" rel="dofollow" class="ue4d8158c315250d3114e7b7cd9f6574a"><style> .ue4d8158c315250d3114e7b7cd9f6574a { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #27AE60!important; text-decoration:none; } .ue4d8158c315250d3114e7b7cd9f6574a:active, .ue4d8158c315250d3114e7b7cd9f6574a:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .ue4d8158c315250d3114e7b7cd9f6574a { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .ue4d8158c315250d3114e7b7cd9f6574a .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .ue4d8158c315250d3114e7b7cd9f6574a .postTitle { color:#16A085; text-decoration: underline!important; font-size: 16px; } .ue4d8158c315250d3114e7b7cd9f6574a:hover .postTitle { text-decoration: underline!important; } </style><div style="padding-left:1em; padding-right:1em;"><span class="ctaText">Tham Khảo Thêm:</span> <span class="postTitle">Sục Một Khí Vào Nước Brom, Thấy Nước Brom Bị Nhạt Màu ... - HOC247</span></div></a></div><p>When a coroutine reaches a suspension point </p> <ul> <li> the return object obtained earlier is returned to the caller/resumer, after implicit conversion to the return type of the coroutine, if necessary. </li> </ul> <p>When a coroutine reaches the co_return statement, it performs the following: </p> <ul> <li> calls promise.return_void() for </li> </ul> <ul> <li> co_return; </li> <li> co_return expr; where expr has type void </li> </ul> <ul> <li> or calls promise.return_value(expr) for co_return expr; where expr has non-void type </li> <li> destroys all variables with automatic storage duration in reverse order they were created. </li> <li> calls promise.final_suspend() and co_awaits the result. </li> </ul> <p>Falling off the end of the coroutine is equivalent to co_return;, except that the behavior is undefined if the Promise type has no Promise::return_void() member function. A function with none of the defining keywords in its function body is not a coroutine, regardless of its return type, and falling off the end results in undefined behavior if the return type is not <i>cv</i> void. </p> <p>If the coroutine ends with an uncaught exception, it performs the following: </p> <ul> <li> catches the exception and calls promise.unhandled_exception() from within the catch-block </li> <li> calls promise.final_suspend() and co_awaits the result (e.g. to resume a continuation or publish a result). It’s undefined behavior to resume a coroutine from this point. </li> </ul> <p>When the coroutine state is destroyed either because it terminated via co_return or uncaught exception, or because it was destroyed via its handle, it does the following: </p> <ul> <li> calls the destructor of the promise object. </li> <li> calls the destructors of the function parameter copies. </li> <li> calls operator delete to free the memory used by the coroutine state. </li> <li> transfers execution back to the caller/resumer. </li> </ul> <h3>[edit] Dynamic allocation</h3> <p>Coroutine state is allocated dynamically via non-array operator new. </p> <p>If the Promise type defines a class-level replacement, it will be used, otherwise global operator new will be used. </p> <p class="internal-link" style="padding: 20px; background: #e9ebec;">Xem thêm : <a target="_blank" rel="noopener noreferrer" href="https://asec.edu.vn/cach-nhan-biet-chat-ket-tua/">Cách nhận biết các chất kết tủa và ứng dụng của chúng</a></p><p>If the Promise type defines a placement form of operator new that takes additional parameters, and they match an argument list where the first argument is the size requested (of type std::size_t) and the rest are the coroutine function arguments, those arguments will be passed to operator new (this makes it possible to use leading-allocator-convention for coroutines). </p> <p>The call to operator new can be optimized out (even if custom allocator is used) if </p> <ul> <li> The lifetime of the coroutine state is strictly nested within the lifetime of the caller, and </li> <li> the size of coroutine frame is known at the call site. </li> </ul> <p>In that case, coroutine state is embedded in the caller’s stack frame (if the caller is an ordinary function) or coroutine state (if the caller is a coroutine). </p> <p>If allocation fails, the coroutine throws std::bad_alloc, unless the Promise type defines the member function Promise::get_return_object_on_allocation_failure(). If that member function is defined, allocation uses the nothrow form of operator new and on allocation failure, the coroutine immediately returns the object obtained from Promise::get_return_object_on_allocation_failure() to the caller, e.g.: </p> <h3>[edit] Promise</h3> <p>The Promise type is determined by the compiler from the return type of the coroutine using std::coroutine_traits. </p> <div style="clear:both; margin-top:0em; margin-bottom:1em;"><a href="https://asec.edu.vn/aloh3-ra-al2so43/" target="_blank" rel="dofollow" class="u5affa88ef8bee999ca1a54516eb20e23"><style> .u5affa88ef8bee999ca1a54516eb20e23 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #27AE60!important; text-decoration:none; } .u5affa88ef8bee999ca1a54516eb20e23:active, .u5affa88ef8bee999ca1a54516eb20e23:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u5affa88ef8bee999ca1a54516eb20e23 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u5affa88ef8bee999ca1a54516eb20e23 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u5affa88ef8bee999ca1a54516eb20e23 .postTitle { color:#16A085; text-decoration: underline!important; font-size: 16px; } .u5affa88ef8bee999ca1a54516eb20e23:hover .postTitle { text-decoration: underline!important; } </style><div style="padding-left:1em; padding-right:1em;"><span class="ctaText">Tham Khảo Thêm:</span> <span class="postTitle"></span></div></a></div><p>Formally, let R and Args… denote the return type and parameter type list of a coroutine respectively, ClassT and <i>cv-qual</i> (if any) denote the class type to which the coroutine belongs and its cv-qualification respectively if it is defined as a non-static member function, its Promise type is determined by: </p> <ul> <li> std::coroutine_traits<R, Args…>::promise_type, if the coroutine is not defined as a non-static member function, </li> <li> std::coroutine_traits<R, ClassT /*cv-qual*/&, Args…>::promise_type, if the coroutine is defined as a non-static member function that is not rvalue-reference-qualified, </li> <li> std::coroutine_traits<R, ClassT /*cv-qual*/&&, Args…>::promise_type, if the coroutine is defined as a non-static member function that is rvalue-reference-qualified. </li> </ul> <p>For example: </p> <p> If the coroutine is defined as … then its Promise type is … task<void> foo(int x); std::coroutine_traits<task<void>, int>::promise_type task<void> Bar::foo(int x) const; std::coroutine_traits<task<void>, const Bar&, int>::promise_type task<void> Bar::foo(int x) &&; std::coroutine_traits<task<void>, Bar&&, int>::promise_type </p> <h3>[edit] co_await</h3> <p>The unary operator co_await suspends a coroutine and returns control to the caller. Its operand is an expression that either (1) is of a class type that defines a member operator co_await or may be passed to a non-member operator co_await, or (2) is convertible to such a class type by means of the current coroutine’s Promise::await_transform. </p> <p> <b>co_await</b> expr </p> <p>A co_await expression can only appear in a potentially-evaluated expression within a regular function body, and cannot appear </p> <ul> <li> in an exception handler, </li> <li> in a declaration statement, unless it appears in an initializer of that declaration statement, </li> <li> in the simple declaration of an init-statement (see if, switch, for and range-for), unless it appears in an initializer of that init-statement, </li> <li> in a default argument, or </li> <li> in the initializer of a block-scope variable with static or thread storage duration. </li> </ul> <p>First, expr is converted to an awaitable as follows: </p> <ul> <li> if expr is produced by an initial suspend point, a final suspend point, or a yield expression, the awaitable is expr, as-is. </li> <li> otherwise, if the current coroutine’s Promise type has the member function await_transform, then the awaitable is promise.await_transform(expr). </li> <li> otherwise, the awaitable is expr, as-is. </li> </ul> <p>Then, the awaiter object is obtained, as follows: </p> <ul> <li> if overload resolution for operator co_await gives a single best overload, the awaiter is the result of that call: </li> </ul> <ul> <li> awaitable.operator co_await() for member overload, </li> <li> operator co_await(static_cast<Awaitable&&>(awaitable)) for the non-member overload. </li> </ul> <ul> <li> otherwise, if overload resolution finds no operator co_await, the awaiter is awaitable, as-is. </li> <li> otherwise, if overload resolution is ambiguous, the program is ill-formed. </li> </ul> <p>If the expression above is a prvalue, the awaiter object is a temporary materialized from it. Otherwise, if the expression above is a glvalue, the awaiter object is the object to which it refers. </p> <p>Then, awaiter.await_ready() is called (this is a short-cut to avoid the cost of suspension if it’s known that the result is ready or can be completed synchronously). If its result, contextually-converted to bool is false then </p> <p class="internal-link" style="padding: 20px; background: #e9ebec;">Xem thêm : <a target="_blank" rel="noopener noreferrer" href="https://asec.edu.vn/nhom-7a/">Halogen – Nhóm 7a (VIIA) trong bảng tuần hoàn hóa học</a></p><p> The coroutine is suspended (its coroutine state is populated with local variables and current suspension point). awaiter.await_suspend(handle) is called, where handle is the coroutine handle representing the current coroutine. Inside that function, the suspended coroutine state is observable via that handle, and it’s this function’s responsibility to schedule it to resume on some executor, or to be destroyed (returning false counts as scheduling) </p> <ul> <li> if await_suspend returns void, control is immediately returned to the caller/resumer of the current coroutine (this coroutine remains suspended), otherwise </li> <li> if await_suspend returns bool, </li> </ul> <ul> <li> the value true returns control to the caller/resumer of the current coroutine </li> <li> the value false resumes the current coroutine. </li> </ul> <ul> <li> if await_suspend returns a coroutine handle for some other coroutine, that handle is resumed (by a call to handle.resume()) (note this may chain to eventually cause the current coroutine to resume). </li> <li> if await_suspend throws an exception, the exception is caught, the coroutine is resumed, and the exception is immediately re-thrown. </li> </ul> <div style="clear:both; margin-top:0em; margin-bottom:1em;"><a href="https://asec.edu.vn/cuoh2-hcl-pt-ion/" target="_blank" rel="dofollow" class="u6f36876c06ac70569c04d9aca2a360da"><style> .u6f36876c06ac70569c04d9aca2a360da { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #27AE60!important; text-decoration:none; } .u6f36876c06ac70569c04d9aca2a360da:active, .u6f36876c06ac70569c04d9aca2a360da:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u6f36876c06ac70569c04d9aca2a360da { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u6f36876c06ac70569c04d9aca2a360da .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u6f36876c06ac70569c04d9aca2a360da .postTitle { color:#16A085; text-decoration: underline!important; font-size: 16px; } .u6f36876c06ac70569c04d9aca2a360da:hover .postTitle { text-decoration: underline!important; } </style><div style="padding-left:1em; padding-right:1em;"><span class="ctaText">Tham Khảo Thêm:</span> <span class="postTitle"></span></div></a></div><p>Finally, awaiter.await_resume() is called (whether the coroutine was suspended or not), and its result is the result of the whole co_await expr expression. </p> <p>If the coroutine was suspended in the co_await expression, and is later resumed, the resume point is immediately before the call to awaiter.await_resume(). </p> <p>Note that because the coroutine is fully suspended before entering awaiter.await_suspend(), that function is free to transfer the coroutine handle across threads, with no additional synchronization. For example, it can put it inside a callback, scheduled to run on a threadpool when async I/O operation completes. In that case, since the current coroutine may have been resumed and thus executed the awaiter object’s destructor, all concurrently as await_suspend() continues its execution on the current thread, await_suspend() should treat *this as destroyed and not access it after the handle was published to other threads. </p> <h3>[edit] Example</h3> <p>Note: the awaiter object is part of coroutine state (as a temporary whose lifetime crosses a suspension point) and is destroyed before the co_await expression finishes. It can be used to maintain per-operation state as required by some async I/O APIs without resorting to additional dynamic allocations. </p> <p>The standard library defines two trivial awaitables: std::suspend_always and std::suspend_never. </p> <p> This section is incompleteReason: examples </p> <h3>[edit] co_yield</h3> <p>co_yield expression returns a value to the caller and suspends the current coroutine: it is the common building block of resumable generator functions. </p> <p> <b>co_yield</b> expr <b>co_yield</b> braced-init-list </p> <p>It is equivalent to </p> <p>A typical generator’s yield_value would store (copy/move or just store the address of, since the argument’s lifetime crosses the suspension point inside the co_await) its argument into the generator object and return std::suspend_always, transferring control to the caller/resumer. </p> <h3>[edit] Notes</h3> <p> Feature-test macro Value Std Feature __cpp_impl_coroutine 201902L (C++20) Coroutines (compiler support) __cpp_lib_coroutine 201902L (C++20) Coroutines (library support) __cpp_lib_generator 202207L (C++23) std::generator: synchronous coroutine generator for ranges </p> <h3>[edit] Library support</h3> <p>Coroutine support library defines several types providing compile and run-time support for coroutines. </p> <h3>[edit] See also</h3> <p> A view that represents synchronous <strong>coroutine</strong> generator (class template) [edit] </p> <h3>[edit] External links</h3> <p> 1. David Mazières, 2021 – Tutorial on C++20 coroutines. 2. Lewis Baker, 2017-2022 – Asymmetric Transfer.</p> <p class="internal-link" style="padding: 20px; background: #eaf0ff;">Nguồn: <a target="_blank" href="https://asec.edu.vn">https://asec.edu.vn</a><br />Danh mục: <a target="_blank" href="https://asec.edu.vn/giao-duc/hoa/">Hóa</a></p><!--<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/"> <rdf:Description rdf:about="https://asec.edu.vn/c-co/" dc:identifier="https://asec.edu.vn/c-co/" dc:title="Coroutines (C++20)" trackback:ping="https://asec.edu.vn/c-co/trackback/" /> </rdf:RDF>--> </div><div class="related"><h3 class="related-title">Bài viết liên quan</h3><div class="related-posts"><div class="related-post"><a href="https://asec.edu.vn/ba-cl2/" rel="bookmark" title="Liên kết tới Bariumchlorid 0.1 M BaCl2 (0.2N) volumetrische Lösung, Fluka™"></a><div class="related-post-info"><a class="related-post-title" 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