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< p > Library Version 11.2.5.2< / p >
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< th colspan = "3" align = "center" > DbEnv::memp_trickle()< / th >
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The DbMpoolFile Handle
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< h2 class = "title" style = "clear: both" > < a id = "memptrickle" > < / a > DbEnv::memp_trickle()< / h2 >
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< pre class = "programlisting" > #include < db_cxx.h>
int
DbEnv::memp_trickle(int percent, int *nwrotep);< / pre >
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The < code class = "methodname" > DbEnv::memp_trickle()< / code > method ensures that a specified percent of
the pages in the cache are clean, by writing dirty pages
to their backing files.
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The purpose of the < code class = "methodname" > DbEnv::memp_trickle()< / code > function is to enable a
memory pool manager to ensure that a page is always available for
reading in new information without having to wait for a write.
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The < code class = "methodname" > DbEnv::memp_trickle()< / code > < span >
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method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
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< h3 class = "title" > < a id = "id3626005" > < / a > Parameters< / h3 >
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< h4 class = "title" > < a id = "id3625849" > < / a > percent< / h4 >
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The < span class = "bold" > < strong > percent< / strong > < / span > parameter is the percent
of the pages in the cache that should be clean.
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The < span class = "bold" > < strong > nwrotep< / strong > < / span > parameter references
memory into which the number of pages written to reach the specified
percentage is copied.
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< h3 class = "title" > < a id = "id3626324" > < / a > Errors< / h3 >
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The < code class = "methodname" > DbEnv::memp_trickle()< / code > < span >
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method may fail and throw a < a class = "link" href = "dbexception.html" title = "Chapter > DbException< / a >
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
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following non-zero errors:
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< h4 class = "title" > < a id = "id3626686" > < / a > EINVAL< / h4 >
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An invalid flag value or parameter was specified.
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< a class = "xref" href = "memp.html#memplist" title = "Memory Pools and Related Methods" > Memory Pools and Related Methods< / a >
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