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<! "@(#)trickle.so 10.10 (Sleepycat) 10/2/98">
<!Copyright 1997, 1998 by Sleepycat Software, Inc. All rights reserved.>
<html>
<body bgcolor=white>
<head>
<title>Berkeley DB: DbMpool::trickle</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btr
ee,hash,hashing,transaction,transactions,locking,logging,access method,access me
thods,java,C,C++">
</head>
<h1>DbMpool::trickle</h1>
<hr size=1 noshade>
<tt>
<h3>
<pre>
#include <db_cxx.h>
<p>
int
DbMpool::trickle(int pct, int *nwrotep);
</pre>
</h3>
<h1>Description</h1>
<p>
The DbMpool::trickle method ensures that at least <b>pct</b> percent of
the pages in the shared memory pool are clean by writing dirty pages to
their backing files.
If the <b>nwrotep</b> argument is non-NULL, the number of pages that
were written to reach the correct percentage is returned in the memory
location it references.
<p> The purpose of the DbMpool::trickle 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.
<p>
The DbMpool::trickle
method either returns <b>errno</b> or throws an exception that
encapsulates an <b>errno</b> on failure, and 0 on success.
<p>
<h1>Errors</h1>
If a fatal error occurs in Berkeley DB, the DbMpool::trickle method may fail and either
return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,
at which point all subsequent database calls will also fail in the same
way. Methods marked as returning <b>errno</b> will, by default, throw
an exception that encapsulates the error information. The default error
behavior can be changed, see <a href="../../api_cxx/DbException/class.html">DbException</a>.
<p>
The DbMpool::trickle
method may fail and throw an exception
for any of the errors specified for the following Berkeley DB and C library
functions:
DBmemp->pgin(3),
DBmemp->pgout(3),
abort(3),
close(3),
dbenv->db_paniccall(3),
fcntl(3),
fflush(3),
fprintf(3),
free(3),
fstat(3),
fsync(3),
getenv(3),
getpid(3),
getuid(3),
isdigit(3),
<a href="../../api_cxx/DbLog/compare.html">DbLog::compare</a>,
<a href="../../api_cxx/DbLog/flush.html">DbLog::flush</a>,
lseek(3),
malloc(3),
memcmp(3),
memcpy(3),
memset(3),
mmap(3),
open(3),
pread(3),
pstat_getdynamic(3),
pwrite(3),
read(3),
sigfillset(3),
sigprocmask(3),
stat(3),
strerror(3),
strlen(3),
sysconf(3),
time(3),
unlink(3),
vfprintf(3),
vsnprintf(3),
and
write(3).
<p>
In addition, the DbMpool::trickle
method may fail and throw an exception
or return <b>errno</b>
for the following conditions:
<dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>
</dl>
<p>
<h1>Class</h1>
<a href="../../api_cxx/DbMpool/class.html">DbMpool</a>
<p>
<h1>See Also</h1>
<a href="../../api_cxx/DbMpool/close.html">DbMpool::close</a>,
<a href="../../api_cxx/DbMpool/open.html">DbMpool::open</a>,
<a href="../../api_cxx/DbMpool/db_register.html">DbMpool::db_register</a>,
<a href="../../api_cxx/DbMpool/stat.html">DbMpool::stat</a>,
<a href="../../api_cxx/DbMpool/sync.html">DbMpool::sync</a>,
DbMpool::trickle
and
<a href="../../api_cxx/DbMpool/unlink.html">DbMpool::unlink</a>.
</tt>
</body>
</html>
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