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1 | |
2 | // Copyright Oliver Kowalke 2015. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | ||
8 | #ifndef BOOST_FIBERS_ALGO_WORK_STEALING_H | |
9 | #define BOOST_FIBERS_ALGO_WORK_STEALING_H | |
10 | ||
11 | #include <atomic> | |
12 | #include <condition_variable> | |
13 | #include <chrono> | |
14 | #include <cstddef> | |
15 | #include <cstdint> | |
16 | #include <mutex> | |
17 | #include <vector> | |
18 | ||
19 | #include <boost/config.hpp> | |
20 | #include <boost/intrusive_ptr.hpp> | |
21 | ||
22 | #include <boost/fiber/algo/algorithm.hpp> | |
23 | #include <boost/fiber/context.hpp> | |
24 | #include <boost/fiber/detail/config.hpp> | |
25 | #include <boost/fiber/detail/context_spinlock_queue.hpp> | |
26 | #include <boost/fiber/detail/context_spmc_queue.hpp> | |
27 | #include <boost/fiber/scheduler.hpp> | |
28 | ||
29 | #ifdef BOOST_HAS_ABI_HEADERS | |
30 | # include BOOST_ABI_PREFIX | |
31 | #endif | |
32 | ||
33 | namespace boost { | |
34 | namespace fibers { | |
35 | namespace algo { | |
36 | ||
11fdf7f2 | 37 | class BOOST_FIBERS_DECL work_stealing : public algorithm { |
b32b8144 FG |
38 | private: |
39 | static std::atomic< std::uint32_t > counter_; | |
40 | static std::vector< intrusive_ptr< work_stealing > > schedulers_; | |
41 | ||
42 | std::uint32_t id_; | |
43 | std::uint32_t thread_count_; | |
44 | #ifdef BOOST_FIBERS_USE_SPMC_QUEUE | |
45 | detail::context_spmc_queue rqueue_{}; | |
46 | #else | |
47 | detail::context_spinlock_queue rqueue_{}; | |
48 | #endif | |
49 | std::mutex mtx_{}; | |
50 | std::condition_variable cnd_{}; | |
51 | bool flag_{ false }; | |
52 | bool suspend_; | |
53 | ||
54 | static void init_( std::uint32_t, std::vector< intrusive_ptr< work_stealing > > &); | |
55 | ||
56 | public: | |
57 | work_stealing( std::uint32_t, bool = false); | |
58 | ||
59 | work_stealing( work_stealing const&) = delete; | |
60 | work_stealing( work_stealing &&) = delete; | |
61 | ||
62 | work_stealing & operator=( work_stealing const&) = delete; | |
63 | work_stealing & operator=( work_stealing &&) = delete; | |
64 | ||
65 | virtual void awakened( context *) noexcept; | |
66 | ||
67 | virtual context * pick_next() noexcept; | |
68 | ||
69 | virtual context * steal() noexcept { | |
70 | return rqueue_.steal(); | |
71 | } | |
72 | ||
73 | virtual bool has_ready_fibers() const noexcept { | |
74 | return ! rqueue_.empty(); | |
75 | } | |
76 | ||
77 | virtual void suspend_until( std::chrono::steady_clock::time_point const&) noexcept; | |
78 | ||
79 | virtual void notify() noexcept; | |
80 | }; | |
81 | ||
82 | }}} | |
83 | ||
84 | #ifdef BOOST_HAS_ABI_HEADERS | |
85 | # include BOOST_ABI_SUFFIX | |
86 | #endif | |
87 | ||
88 | #endif // BOOST_FIBERS_ALGO_WORK_STEALING_H |