mirror of
https://github.com/matrix-construct/construct
synced 2024-05-20 03:43:47 +02:00
169 lines
4 KiB
C++
169 lines
4 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_IOS_HANDLER_H
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namespace ircd::ios
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{
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struct handler;
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template<class function>
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struct handle;
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const string_view &name(const handler &);
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}
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/// Non-template base class for ios::handle; templated derivations of this
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/// class comprise the function object we're submitting to boost::asio.
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struct ircd::ios::handler
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{
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static thread_local handler *current;
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static thread_local uint64_t epoch;
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static void enqueue(handler *) noexcept;
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static void *allocate(handler *, const size_t);
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static void deallocate(handler *, void *, const size_t) noexcept;
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static bool continuation(handler *) noexcept;
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static void enter(handler *) noexcept;
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static void leave(handler *) noexcept;
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static bool fault(handler *) noexcept;
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ios::descriptor *descriptor {nullptr};
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uint64_t ts {0}; // last tsc sample; for profiling each phase
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};
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/// Our function object type template. These should be rvalue-constructed in a
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/// callback argument to a boost::asio call. A reference to an ios::descriptor
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/// must be provided.
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template<class function>
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struct ircd::ios::handle
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:handler
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{
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function f;
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template<class... args>
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void operator()(args&&... a) const;
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handle(ios::descriptor &, function) noexcept;
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};
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//
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// ircd::ios::handle
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//
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/// Construction of the handle is considered the enquement. Construct in the
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/// callback argument to a boost::asio call; provide a reference to the
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/// appropriate callsite descriptor.
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template<class function>
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inline
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ircd::ios::handle<function>::handle(ios::descriptor &d,
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function f)
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noexcept
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:handler{&d, prof::cycles()}
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,f(std::move(f))
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{
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handler::enqueue(this);
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}
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template<class function>
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template<class... args>
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inline void
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ircd::ios::handle<function>::operator()(args&&... a)
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const
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{
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assert(descriptor && descriptor->stats);
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assert(descriptor->stats->queued > 0);
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descriptor->stats->queued--;
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f(std::forward<args>(a)...);
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}
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//
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// ircd::ios::handler
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//
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[[gnu::hot]]
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inline void
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ircd::ios::handler::deallocate(handler *const handler,
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void *const ptr,
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const size_t size)
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noexcept
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{
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assert(handler && handler->descriptor);
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auto &descriptor(*handler->descriptor);
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assert(descriptor.deallocator);
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descriptor.deallocator(*handler, ptr, size);
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assert(descriptor.stats);
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auto &stats(*descriptor.stats);
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stats.free_bytes += size;
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++stats.frees;
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}
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[[gnu::hot]]
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inline void *
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ircd::ios::handler::allocate(handler *const handler,
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const size_t size)
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{
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assert(handler && handler->descriptor);
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auto &descriptor(*handler->descriptor);
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assert(descriptor.stats);
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auto &stats(*descriptor.stats);
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stats.alloc_bytes += size;
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++stats.allocs;
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assert(descriptor.allocator);
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return descriptor.allocator(*handler, size);
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}
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[[gnu::hot]]
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inline void
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ircd::ios::handler::enqueue(handler *const handler)
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noexcept
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{
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assert(handler && handler->descriptor);
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auto &descriptor(*handler->descriptor);
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assert(descriptor.stats);
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auto &stats(*descriptor.stats);
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++stats.queued;
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if constexpr(profile::logging)
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log::logf
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{
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log, log::level::DEBUG,
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"QUEUE %5u %-30s [%11lu] ------[%15lu] q:%-4lu",
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descriptor.id,
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trunc(descriptor.name, 30),
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uint64_t(stats.calls),
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0UL,
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uint64_t(stats.queued),
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};
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}
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[[gnu::hot]]
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inline bool
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ircd::ios::handler::continuation(handler *const handler)
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noexcept
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{
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assert(handler && handler->descriptor);
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auto &descriptor(*handler->descriptor);
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return descriptor.continuation;
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}
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inline const ircd::string_view &
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ircd::ios::name(const handler &handler)
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{
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assert(handler.descriptor);
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return name(*handler.descriptor);
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}
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