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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/Sys/PetscOptionsMonitorSet.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscOptionsMonitorSet"><H1>PetscOptionsMonitorSet</H1></A>
Sets an ADDITIONAL function to be called at every method that modified the PETSc options database.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsys.h"
PetscErrorCode PetscOptionsMonitorSet(PetscErrorCode (*monitor)(const char name[], const char value[], void*),void *mctx,PetscErrorCode (*monitordestroy)(void**))
</PRE>
Not collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>monitor </B></TD><TD>- pointer to function (if this is NULL, it turns off monitoring
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mctx </B></TD><TD>- [optional] context for private data for the
monitor routine (use NULL if no context is desired)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>monitordestroy </B></TD><TD>- [optional] routine that frees monitor context
(may be NULL)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling Sequence of monitor</FONT></H3>
<pre>
monitor (const char name[], const char value[], void *mctx)
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>name </B></TD><TD>- option name string
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>value </B></TD><TD>- option value string
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mctx </B></TD><TD>- optional monitoring context, as set by <A HREF="../Sys/PetscOptionsMonitorSet.html#PetscOptionsMonitorSet">PetscOptionsMonitorSet</A>()
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-options_monitor </B></TD><TD>- sets <A HREF="../Sys/PetscOptionsMonitorDefault.html#PetscOptionsMonitorDefault">PetscOptionsMonitorDefault</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-options_monitor_cancel </B></TD><TD>- cancels all monitors that have
been hardwired into a code by
calls to <A HREF="../Sys/PetscOptionsMonitorSet.html#PetscOptionsMonitorSet">PetscOptionsMonitorSet</A>(), but
does not cancel those set via
the options database.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The default is to do nothing. To print the name and value of options
being inserted into the database, use <A HREF="../Sys/PetscOptionsMonitorDefault.html#PetscOptionsMonitorDefault">PetscOptionsMonitorDefault</A>() as the monitoring routine,
with a null monitoring context.
<P>
Several different monitoring routines may be set by calling
<A HREF="../Sys/PetscOptionsMonitorSet.html#PetscOptionsMonitorSet">PetscOptionsMonitorSet</A>() multiple times; all will be called in the
order in which they were set.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
PetscOptions, set, monitor
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscOptionsMonitorDefault.html#PetscOptionsMonitorDefault">PetscOptionsMonitorDefault</A>(), <A HREF="../Sys/PetscOptionsMonitorCancel.html#PetscOptionsMonitorCancel">PetscOptionsMonitorCancel</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/objects/options.c.html#PetscOptionsMonitorSet">src/sys/objects/options.c</A>
<BR><A HREF="./index.html">Index of all Sys routines</A>
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