120 lines
3.2 KiB
C++
120 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2022-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#pragma once
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/**
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* @file include/maxscale/poll.hh - The public poll interface
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*/
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#include <maxscale/ccdefs.hh>
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#include <maxscale/buffer.hh>
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#include <maxscale/dcb.hh>
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MXS_BEGIN_DECLS
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/**
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* A statistic identifier that can be returned by poll_get_stat
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*/
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typedef enum
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{
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POLL_STAT_READ,
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POLL_STAT_WRITE,
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POLL_STAT_ERROR,
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POLL_STAT_HANGUP,
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POLL_STAT_ACCEPT,
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POLL_STAT_EVQ_AVG,
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POLL_STAT_EVQ_MAX,
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POLL_STAT_MAX_QTIME,
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POLL_STAT_MAX_EXECTIME
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} POLL_STAT;
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/*
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* Return a particular statistics value.
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*
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* @param stat What to return.
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*
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* @return The value.
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*/
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int64_t poll_get_stat(POLL_STAT stat);
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/*
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* Insert a fake hangup event for a DCB into the polling queue.
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*
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* This is used when a monitor detects that a server is not responding.
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*
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* @param dcb DCB to emulate an EPOLLOUT event for
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*/
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void poll_fake_hangup_event(DCB* dcb);
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/*
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* Insert a fake write completion event for a DCB into the polling
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* queue.
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*
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* This is used to trigger transmission activity on another DCB from
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* within the event processing routine of a DCB. or to allow a DCB
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* to defer some further output processing, to allow for other DCBs
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* to receive a slice of the processing time. Fake events are added
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* to the tail of the event queue, in the same way that real events
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* are, so maintain the "fairness" of processing.
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*
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* @param dcb DCB to emulate an EPOLLOUT event for
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*/
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void poll_fake_write_event(DCB* dcb);
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/*
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* Insert a fake read completion event for a DCB into the polling
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* queue.
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*
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* This is used to trigger transmission activity on another DCB from
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* within the event processing routine of a DCB. or to allow a DCB
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* to defer some further input processing, to allow for other DCBs
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* to receive a slice of the processing time. Fake events are added
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* to the tail of the event queue, in the same way that real events
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* are, so maintain the "fairness" of processing.
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*
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* @param dcb DCB to emulate an EPOLLIN event for
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*/
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void poll_fake_read_event(DCB* dcb);
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/**
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* Add a DCB to the set of descriptors within the polling
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* environment.
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*
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* @param dcb The descriptor to add to the poll
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* @return -1 on error or 0 on success
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*/
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int poll_add_dcb(DCB*);
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/**
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* Remove a descriptor from the set of descriptors within the
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* polling environment.
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*
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* @param dcb The descriptor to remove
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* @return -1 on error or 0 on success; actually always 0
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*/
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int poll_remove_dcb(DCB*);
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/**
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* Add given GWBUF to DCB's readqueue and add a pending EPOLLIN event for DCB.
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* The event pretends that there is something to read for the DCB. Actually
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* the incoming data is stored in the DCB's readqueue where it is read.
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*
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* @param dcb DCB where the event and data are added
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* @param buf GWBUF including the data
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*
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*/
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void poll_add_epollin_event_to_dcb(DCB* dcb, GWBUF* buf);
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MXS_END_DECLS
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