mirror of
https://github.com/matrix-construct/construct
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64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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_FS_AIO_H
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// Public and unconditional interface for AIO. This file is part of the
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// standard include stack and available whether or not this platform is Linux
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// with AIO, and whether or not it's enabled, etc. If it is not most of this
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// stuff does nothing and will have null values.
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/// Asynchronous filesystem Input/Output
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///
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namespace ircd::fs::aio
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{
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struct init;
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struct stats;
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struct kernel;
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struct request;
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extern kernel *context;
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extern struct stats stats;
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}
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/// Statistics structure.
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///
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/// Subtract complete from requests to get the count of requests pending
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/// "in flight." Subtract errors from complete to only get the count of
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/// fully successful operations. complete will always eventually match
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/// up with requests.
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///
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/// Subtract complete_bytes from requests_bytes to get the total bytes
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/// currently pending "in flight." Subtract errors_bytes from response_bytes
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/// to only get bytes successfully read or written. complete_bytes will
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/// always eventually match up with requests_bytes.
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///
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struct ircd::fs::aio::stats
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{
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uint64_t requests {0}; ///< count of requests created
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uint64_t complete {0}; ///< count of requests completed
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uint64_t handles {0}; ///< count of event_fd callbacks
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uint64_t events {0}; ///< count of events from io_getevents
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uint64_t cancel {0}; ///< count of requests canceled
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uint64_t errors {0}; ///< count of response errcodes
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uint64_t requests_bytes {0}; ///< total bytes for requests created
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uint64_t complete_bytes {0}; ///< total bytes for requests completed
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uint64_t errors_bytes {0}; ///< total bytes for completed w/ errc
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uint64_t cancel_bytes {0}; ///< total bytes for cancels
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};
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struct ircd::fs::aio::init
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{
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init();
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~init() noexcept;
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};
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