63e88f80
 Hu Chunming
提交三方库
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// Copyright Nat Goodspeed 2014.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Define fiber_properties, a base class from which a library consumer can
// derive a subclass with specific properties important to a user-coded
// scheduler.
#ifndef BOOST_FIBERS_PROPERTIES_HPP
#define BOOST_FIBERS_PROPERTIES_HPP
#include <boost/assert.hpp>
#include <boost/fiber/detail/config.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
# if defined(BOOST_MSVC)
# pragma warning(push)
# pragma warning(disable:4275)
# endif
namespace boost {
namespace fibers {
class context;
namespace algo {
class algorithm;
}
class BOOST_FIBERS_DECL fiber_properties {
protected:
// initialized by constructor
context * ctx_;
// set every time this fiber becomes READY
algo::algorithm * algo_{ nullptr };
// Inform the relevant algorithm instance that something important
// has changed, so it can (presumably) adjust its data structures
// accordingly.
void notify() noexcept;
public:
// Any specific property setter method, after updating the relevant
// instance variable, can/should call notify().
// fiber_properties, and by implication every subclass, must accept a back
// pointer to its context.
// For fiber_properties passed to fiber constructors, nullptr must be
// used here.
explicit fiber_properties( context * ctx) noexcept :
ctx_{ ctx } {
}
// We need a virtual destructor (hence a vtable) because fiber_properties
// is stored polymorphically (as fiber_properties*) in context, and
// destroyed via that pointer.
virtual ~fiber_properties() = default;
// not really intended for public use, but algorithm_with_properties
// must be able to call this
void set_algorithm( algo::algorithm * algo) noexcept {
algo_ = algo;
}
// not really intended for public use, but required to set properties
// on fiber/context construction.
void set_context( context* ctx ) noexcept {
BOOST_ASSERT( ctx_ == nullptr );
BOOST_ASSERT( ctx != nullptr );
ctx_ = ctx;
}
};
}} // namespace boost::fibers
# if defined(BOOST_MSVC)
# pragma warning(pop)
# endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_FIBERS_PROPERTIES_HPP
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