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#include "buf0types.h"
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#include "trx0types.h"
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/********************************************************************//**
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Low-level function which reads a page asynchronously from a file to the
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buffer buf_pool if it is not already there, in which case does nothing.
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Sets the io_fix flag and sets an exclusive lock on the buffer frame. The
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flag is cleared and the x-lock released by an i/o-handler thread.
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@return 1 if a read request was queued, 0 if the page already resided
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in buf_pool, or if the page is in the doublewrite buffer blocks in
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which case it is never read into the pool, or if the tablespace does
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not exist or is being dropped TODO update
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@return 1 if read request is issued. 0 if it is not */
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ulint* err, /*!< out: DB_SUCCESS or DB_TABLESPACE_DELETED if we are
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trying to read from a non-existent tablespace, or a
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tablespace which is just now being dropped */
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ibool sync, /*!< in: true if synchronous aio is desired */
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ulint mode, /*!< in: BUF_READ_IBUF_PAGES_ONLY, ...,
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ORed to OS_AIO_SIMULATED_WAKE_LATER (see below
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at read-ahead functions) */
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ulint space, /*!< in: space id */
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ulint zip_size,/*!< in: compressed page size, or 0 */
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ibool unzip, /*!< in: true=request uncompressed page */
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ib_int64_t tablespace_version, /*!< in: if the space memory object has
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this timestamp different from what we are giving here,
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treat the tablespace as dropped; this is a timestamp we
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use to stop dangling page reads from a tablespace
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which we have DISCARDed + IMPORTed back */
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ulint offset);/*!< in: page number */
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/********************************************************************//**
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High-level function which reads a page asynchronously from a file to the
added
removed
plugin/innobase/include/buf0rea.h
