80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
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// Copyright Nat Goodspeed 2014.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Define fiber_properties, a base class from which a library consumer can
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// derive a subclass with specific properties important to a user-coded
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// scheduler.
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#ifndef BOOST_FIBERS_PROPERTIES_HPP
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#define BOOST_FIBERS_PROPERTIES_HPP
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#include <boost/fiber/detail/config.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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# if defined(BOOST_MSVC)
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# pragma warning(push)
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# pragma warning(disable:4275)
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# endif
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namespace boost {
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namespace fibers {
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class context;
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namespace algo {
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struct algorithm;
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}
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class BOOST_FIBERS_DECL fiber_properties {
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protected:
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// initialized by constructor
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context * ctx_;
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// set every time this fiber becomes READY
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algo::algorithm * algo_{ nullptr };
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// Inform the relevant algorithm instance that something important
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// has changed, so it can (presumably) adjust its data structures
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// accordingly.
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void notify() noexcept;
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public:
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// Any specific property setter method, after updating the relevant
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// instance variable, can/should call notify().
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// fiber_properties, and by implication every subclass, must accept a back
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// pointer to its context.
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fiber_properties( context * ctx) noexcept :
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ctx_{ ctx } {
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}
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// We need a virtual destructor (hence a vtable) because fiber_properties
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// is stored polymorphically (as fiber_properties*) in context, and
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// destroyed via that pointer.
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virtual ~fiber_properties() = default;
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// not really intended for public use, but algorithm_with_properties
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// must be able to call this
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void set_algorithm( algo::algorithm * algo) noexcept {
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algo_ = algo;
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}
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};
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}} // namespace boost::fibers
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# if defined(BOOST_MSVC)
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# pragma warning(pop)
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# endif
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_FIBERS_PROPERTIES_HPP
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