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<title>Berkeley DB: DB_ENV->memp_trickle</title>
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<h1>DB_ENV->memp_trickle</h1>
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DB_ENV->memp_trickle(DB_ENV *env, int pct, int *nwrotep);
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<p>The DB_ENV->memp_trickle method ensures that at least <b>pct</b> percent of
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the pages in the shared memory pool are clean by writing dirty pages to
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If the <b>nwrotep</b> argument is non-NULL, the number of pages that
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were written to reach the correct percentage is returned in the memory
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location to which it refers.
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<p>The purpose of the DB_ENV->memp_trickle function is to enable a memory
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pool manager to ensure that a page is always available for reading in new
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information without having to wait for a write.
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<p>The DB_ENV->memp_trickle method returns a non-zero error value on failure and 0 on success.
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<p>The DB_ENV->memp_trickle method may fail and return a non-zero error for the following conditions:
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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<p>The DB_ENV->memp_trickle method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
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If a catastrophic error has occurred, the DB_ENV->memp_trickle method may fail and
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return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>,
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in which case all subsequent Berkeley DB calls will fail in the same way.
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<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/mempfile_class.html">DB_MPOOLFILE</a>
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<a href="../api_c/memp_list.html">Memory Pools and Related Methods</a>
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