Manpages - MPI_Info_get.3

MPI_Info_get - Retrieves the value associated with a key in an info object.

  #include <mpi.h>
  int MPI_Info_get(MPI_Info info, const char *key, int valuelen, char *value, int *flag)

  USE MPI
  ! or the older form: INCLUDE 'mpif.h'
  MPI_INFO_GET(INFO, KEY, VALUELEN, VALUE, FLAG, IERROR)
  	INTEGER	INFO, VALUELEN, IERROR
  	CHARACTER*(*) KEY, VALUE
  	LOGICAL FLAG

  USE mpi_f08
  MPI_Info_get(info, key, valuelen, value, flag, ierror)
  	TYPE(MPI_Info), INTENT(IN) :: info
  	CHARACTER(LEN=*), INTENT(IN) :: key
  	INTEGER, INTENT(IN) :: valuelen
  	CHARACTER(LEN=valuelen), INTENT(OUT) :: value
  	LOGICAL, INTENT(OUT) :: flag
  	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

  #include <mpi.h>
  bool MPI::Info::Get(const char* key, int valuelen,
  	char* value) const

info

Info object (handle).

key

Key (string).

valuelen

Length of value arg (integer).

value

Value (string).

flag

Returns true if key defined, false if not (boolean).

IERROR

Fortran only: Error status (integer).

MPI_Info_get retrieves the value associated with key in a previous call to MPI_Info_set. If such a key exists, it sets flag to true and returns the value in value; otherwise it sets flag to false and leaves value unchanged. valuelen is the number of characters available in value. If it is less than the actual size of the value, the returned value is truncated. In C, valuelen should be one less than the amount of allocated space to allow for the null terminator.

If key is larger than MPI_MAX_INFO_KEY, the call is erroneous.

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

MPI_Info_create
MPI_Info_delete
MPI_Info_dup
MPI_Info_free
MPI_Info_get_valuelen
MPI_Info_get_nkeys
MPI_Info_get_nthkey
MPI_Info_set