| 1 | // |
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| 2 | // Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net) |
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| 3 | // |
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | // |
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| 7 | |
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| 8 | #include <boost/cobalt/thread.hpp> |
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| 9 | |
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| 10 | #include <boost/asio/append.hpp> |
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| 11 | #include <boost/asio/bind_executor.hpp> |
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| 12 | |
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| 13 | |
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| 14 | namespace boost::cobalt |
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| 15 | { |
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| 16 | |
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| 17 | namespace detail |
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| 18 | { |
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| 19 | |
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| 20 | thread_promise::thread_promise() |
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| 21 | : promise_cancellation_base<asio::cancellation_slot, asio::enable_total_cancellation>( |
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| 22 | signal_helper_2::signal.slot(), asio::enable_total_cancellation()) |
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| 23 | { |
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| 24 | mtx.lock(); |
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| 25 | } |
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| 26 | |
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| 27 | void run_thread( |
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| 28 | std::shared_ptr<thread_state> st_, |
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| 29 | unique_handle<thread_promise> h) |
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| 30 | { |
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| 31 | |
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| 32 | #if !defined(BOOST_COBALT_NO_PMR) |
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| 33 | pmr::unsynchronized_pool_resource resource; |
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| 34 | boost::cobalt::this_thread::set_default_resource(&resource); |
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| 35 | h->resource = &resource; |
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| 36 | #endif |
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| 37 | |
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| 38 | { |
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| 39 | auto st = std::move(st_); |
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| 40 | h->reset_cancellation_source(source: st->signal.slot()); |
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| 41 | h->set_executor(st->ctx.get_executor()); |
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| 42 | boost::cobalt::this_thread::set_executor(st->ctx.get_executor()); |
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| 43 | |
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| 44 | asio::post( |
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| 45 | ex: st->ctx.get_executor(), |
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| 46 | token: [st, h = std::move(h)]() mutable |
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| 47 | { |
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| 48 | std::lock_guard<std::mutex> lock{h->mtx}; |
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| 49 | std::move(h).resume(); |
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| 50 | }); |
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| 51 | |
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| 52 | std::exception_ptr ep; |
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| 53 | |
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| 54 | try |
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| 55 | { |
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| 56 | st->ctx.run(); |
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| 57 | } |
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| 58 | catch(...) |
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| 59 | { |
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| 60 | ep = std::current_exception(); |
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| 61 | } |
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| 62 | |
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| 63 | st->done = true; |
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| 64 | st->signal.slot().clear(); |
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| 65 | std::lock_guard<std::mutex> lock(st->mtx); |
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| 66 | if (!st->waitor && ep) // nobodies waiting, so unhandled exception |
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| 67 | std::rethrow_exception(ep); |
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| 68 | else if (st->waitor) |
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| 69 | asio::post(token: asio::append(completion_token: *std::exchange(obj&: st->waitor, new_val: std::nullopt), values&: ep)); |
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| 70 | } |
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| 71 | } |
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| 72 | |
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| 73 | |
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| 74 | boost::cobalt::thread detail::thread_promise::get_return_object() |
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| 75 | { |
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| 76 | auto st = std::make_shared<thread_state>(); |
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| 77 | boost::cobalt::thread res{std::thread{ |
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| 78 | [st, |
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| 79 | h = unique_handle<detail::thread_promise>::from_promise(p&: *this)]() mutable |
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| 80 | { |
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| 81 | run_thread(st_: std::move(st), h: std::move(h)); |
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| 82 | } |
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| 83 | }, st |
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| 84 | }; |
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| 85 | |
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| 86 | return res; |
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| 87 | } |
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| 88 | |
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| 89 | |
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| 90 | } |
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| 91 | |
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| 92 | void thread::join() {thread_.join();} |
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| 93 | bool thread::joinable() const {return thread_.joinable();} |
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| 94 | void thread::detach() |
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| 95 | { |
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| 96 | thread_.detach(); |
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| 97 | state_ = nullptr; |
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| 98 | } |
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| 99 | } |
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