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.TH "MPI_T_PVAR_READ" "3" "Jul 22, 2024" "" "Open MPI"
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\fI\%MPI_T_pvar_read\fP — Read the value of a performance variable
.SH SYNTAX
.SS C Syntax
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.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>

int MPI_T_pvar_read(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)
.ft P
.fi
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBsession\fP: Performance experiment session.
.IP \(bu 2
\fBhandle\fP: Performance variable handle.
.IP \(bu 2
\fBbuf\fP: Initial address of storage location for variable value.
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.SH DESCRIPTION
.sp
\fI\%MPI_T_pvar_read\fP queries the value of a performance variable identified
by the handle specified in \fIhandle\fP in the session specified in
\fIsession\fP\&. The result is stored in the buffer pointed to by \fIbuf\fP\&. The
caller must ensure that the buffer pointed to by \fIbuf\fP is large enough
to hold the entire value of the performance variable.
.SH ERRORS
.sp
\fI\%MPI_T_pvar_read\fP will fail if:
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.IP \(bu 2
\fBMPI_T_ERR_NOT_INITIALIZED\fP: The MPI Tools interface not initialized
.IP \(bu 2
\fBMPI_T_ERR_INVALID_HANDLE\fP: The handle is invalid or not associated with the session
.IP \(bu 2
\fBMPI_T_ERR_INVALID_SESSION\fP: Session argument is not a valid session
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.sp
\fBSEE ALSO:\fP
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.IP \(bu 2
\fI\%MPI_T_pvar_handle_alloc\fP
.IP \(bu 2
\fI\%MPI_T_pvar_get_info\fP
.IP \(bu 2
\fI\%MPI_T_pvar_session_create\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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