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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/capy | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/capy/ex/thread_pool.hpp> | ||
| 11 | #include <boost/capy/core/intrusive_queue.hpp> | ||
| 12 | #include <condition_variable> | ||
| 13 | #include <mutex> | ||
| 14 | #include <thread> | ||
| 15 | #include <vector> | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace capy { | ||
| 19 | |||
| 20 | //------------------------------------------------------------------------------ | ||
| 21 | |||
| 22 | // Pimpl implementation hides threading details from the header | ||
| 23 | class thread_pool::impl | ||
| 24 | { | ||
| 25 | // Wraps a coroutine handle for queue storage | ||
| 26 | struct work : intrusive_queue<work>::node | ||
| 27 | { | ||
| 28 | any_coro h_; | ||
| 29 | |||
| 30 | 122 | explicit work(any_coro h) noexcept | |
| 31 | 122 | : h_(h) | |
| 32 | { | ||
| 33 | 122 | } | |
| 34 | |||
| 35 | 122 | void run() | |
| 36 | { | ||
| 37 | // delete before dispatch | ||
| 38 | 122 | auto h = h_; | |
| 39 |
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122 | delete this; |
| 40 |
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122 | h.resume(); |
| 41 | 122 | } | |
| 42 | |||
| 43 | ✗ | void destroy() | |
| 44 | { | ||
| 45 | ✗ | delete this; | |
| 46 | ✗ | } | |
| 47 | }; | ||
| 48 | |||
| 49 | std::mutex mutex_; | ||
| 50 | std::condition_variable cv_; | ||
| 51 | intrusive_queue<work> q_; | ||
| 52 | std::vector<std::thread> threads_; | ||
| 53 | bool stop_; | ||
| 54 | |||
| 55 | public: | ||
| 56 | 49 | ~impl() | |
| 57 | { | ||
| 58 | { | ||
| 59 | 49 | std::lock_guard<std::mutex> lock(mutex_); | |
| 60 | 49 | stop_ = true; | |
| 61 | 49 | } | |
| 62 | 49 | cv_.notify_all(); | |
| 63 | |||
| 64 |
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114 | for(auto& t : threads_) |
| 65 | 65 | t.join(); | |
| 66 | |||
| 67 | // Destroy any work items that were never executed | ||
| 68 |
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49 | while(auto* w = q_.pop()) |
| 69 | ✗ | w->destroy(); | |
| 70 | 49 | } | |
| 71 | |||
| 72 | explicit | ||
| 73 | 49 | impl(std::size_t num_threads) | |
| 74 | 49 | : stop_(false) | |
| 75 | { | ||
| 76 |
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49 | if( num_threads == 0) |
| 77 | 1 | num_threads = std::thread::hardware_concurrency(); | |
| 78 | // Fallback | ||
| 79 |
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49 | if( num_threads == 0) |
| 80 | ✗ | num_threads = 1; | |
| 81 | |||
| 82 |
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49 | threads_.reserve(num_threads); |
| 83 |
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114 | for(std::size_t i = 0; i < num_threads; ++i) |
| 84 |
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130 | threads_.emplace_back([this]{ run(); }); |
| 85 | 49 | } | |
| 86 | |||
| 87 | void | ||
| 88 | 122 | post(any_coro h) | |
| 89 | { | ||
| 90 | 122 | auto* w = new work(h); | |
| 91 | { | ||
| 92 |
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122 | std::lock_guard<std::mutex> lock(mutex_); |
| 93 | 122 | q_.push(w); | |
| 94 | 122 | } | |
| 95 | 122 | cv_.notify_one(); | |
| 96 | 122 | } | |
| 97 | |||
| 98 | private: | ||
| 99 | void | ||
| 100 | 65 | run() | |
| 101 | { | ||
| 102 | for(;;) | ||
| 103 | { | ||
| 104 | 187 | work* w = nullptr; | |
| 105 | { | ||
| 106 |
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187 | std::unique_lock<std::mutex> lock(mutex_); |
| 107 |
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187 | cv_.wait(lock, [this]{ |
| 108 |
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283 | return stop_ || !q_.empty(); |
| 109 | }); | ||
| 110 | |||
| 111 | // Only exit when stopped AND queue is drained | ||
| 112 |
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187 | if(stop_ && q_.empty()) |
| 113 | 130 | return; | |
| 114 | |||
| 115 | 122 | w = q_.pop(); | |
| 116 | 187 | } | |
| 117 | |||
| 118 | 122 | w->run(); | |
| 119 | 122 | } | |
| 120 | } | ||
| 121 | }; | ||
| 122 | |||
| 123 | //------------------------------------------------------------------------------ | ||
| 124 | |||
| 125 | 49 | thread_pool:: | |
| 126 | ~thread_pool() | ||
| 127 | { | ||
| 128 | // Order matters: shutdown services, then impl, then base | ||
| 129 | 49 | shutdown(); | |
| 130 |
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49 | delete impl_; |
| 131 | 49 | destroy(); | |
| 132 | 49 | } | |
| 133 | |||
| 134 | 49 | thread_pool:: | |
| 135 | 49 | thread_pool(std::size_t num_threads) | |
| 136 |
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49 | : impl_(new impl(num_threads)) |
| 137 | { | ||
| 138 | 49 | } | |
| 139 | |||
| 140 | //------------------------------------------------------------------------------ | ||
| 141 | |||
| 142 | void | ||
| 143 | 122 | thread_pool::executor_type:: | |
| 144 | post(any_coro h) const | ||
| 145 | { | ||
| 146 | 122 | pool_->impl_->post(h); | |
| 147 | 122 | } | |
| 148 | |||
| 149 | } // capy | ||
| 150 | } // boost | ||
| 151 |