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<TITLE>MPI_Info_get_valuelen</TITLE>
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MPI_Info_get_valuelen
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Retrieves the length of the value associated with a key
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Synopsis
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#undef FUNCNAME
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#define FUNCNAME MPIRInfo_get_valuelen
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#undef FCNAME
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#define FCNAME MPL_QUOTE(FUNCNAME)
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int MPI_Info_get_valuelen(MPI_Info info, const char *key, int *valuelen, int *flag)
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Input Parameters
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info info object (handle)
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key key (string)
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Output Parameters
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valuelen length of value argument (integer)
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flag true if key defined, false if not (boolean)
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Thread and Interrupt Safety
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This routine is thread and interrupt safe only if no MPI routine that
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updates or frees the same <tt>MPI_Info</tt> object may be called concurrently
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with this routine.
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The MPI standard defined a thread-safe interface but this does not
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mean that all routines may be called without any thread locks. For
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example, two threads must not attempt to change the contents of the
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same <tt>MPI_Info</tt> object concurrently. The user is responsible in this
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case for using some mechanism, such as thread locks, to ensure that
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only one thread at a time makes use of this routine.
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Notes for Fortran
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All MPI routines in Fortran (except for <tt>MPI_WTIME</tt> and <tt>MPI_WTICK</tt>) have
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an additional argument <tt>ierr</tt> at the end of the argument list. <tt>ierr
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</tt>is an integer and has the same meaning as the return value of the routine
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in C. In Fortran, MPI routines are subroutines, and are invoked with the
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<tt>call</tt> statement.
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All MPI objects (e.g., <tt>MPI_Datatype</tt>, <tt>MPI_Comm</tt>) are of type <tt>INTEGER
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</tt>in Fortran.
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Errors
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All MPI routines (except <tt>MPI_Wtime</tt> and <tt>MPI_Wtick</tt>) return an error value;
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C routines as the value of the function and Fortran routines in the last
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argument. Before the value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job. The error handler
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may be changed with <tt>MPI_Comm_set_errhandler</tt> (for communicators),
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<tt>MPI_File_set_errhandler</tt> (for files), and <tt>MPI_Win_set_errhandler</tt> (for
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RMA windows). The MPI-1 routine <tt>MPI_Errhandler_set</tt> may be used but
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its use is deprecated. The predefined error handler
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<tt>MPI_ERRORS_RETURN</tt> may be used to cause error values to be returned.
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Note that MPI does not guarentee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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MPI_SUCCESS No error; MPI routine completed successfully.
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MPI_ERR_INFO_KEY Invalid or null key string for info.
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MPI_ERR_OTHER Other error; use <tt>MPI_Error_string</tt> to get more information
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about this error code.
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