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This file contains the raw material for a file of the MPI defined

The data could be organized to look like an enum - or add something to
doctext that say "make each value in a list into an index entry to the
same page.

Doctext could also use a way to include an index to the corresponding
page in the standard, perhaps by using an *input* index file (generated,
perhaps, from the index entries in the LaTeX for the definition index entry).

Needs to be updated for MPI-2 and MPI-3

/*N Datatypes
   Data types:
   Note that the Fortran types should only be used in Fortran programs,
   and the C types should only be used in C programs.  For example,
   it is in error to use 'MPI_INT' for a Fortran INTEGER.
   Datatypes are of type 'MPI_Datatype' in C, type 'INTEGER' in Fortran,
   and 'Type(MPI_Datatype)' in Fortran08

We may want to enlarge on some of these.  For example, the description of
communicators could include information from the standard, and/or links to the

   Constants - Meaning of MPI''s defined constants

.N Datatypes

   C datatypes:
+I  MPI_CHAR - char
.  MPI_SIGNED_CHAR - signed char
.  MPI_UNSIGNED_CHAR - unsigned char
.  MPI_BYTE - See standard; like unsigned char
.  MPI_WCHAR - wide character (wchar_t)
.  MPI_SHORT - short
.  MPI_UNSIGNED_SHORT - unsigned short
.  MPI_INT   - int
.  MPI_UNSIGNED - unsigned int
.  MPI_LONG - long
.  MPI_UNSIGNED_LONG - unsigned long
.  MPI_LONG_LONG_INT - long long
.  MPI_LONG_LONG - synonyn for 'MPI_LONG_LONG_INT'
.  MPI_UNSIGNED_LONG_LONG - unsigned long long
.  MPI_FLOAT - float
.  MPI_DOUBLE - double
.  MPI_LONG_DOUBLE  - long double (some systems may not implement this)
.  MPI_INT8_T  - int8_t
.  MPI_INT16_T - int16_t
.  MPI_INT32_T - int32_t
.  MPI_INT64_T - int64_t
.  MPI_UINT8_T  - uint8_t
.  MPI_UINT16_T - uint16_t
.  MPI_UINT32_T - uint32_t
.  MPI_UINT64_T - uint64_t
.  MPI_C_BOOL -  _Bool
.  MPI_C_FLOAT_COMPLEX - float _Complex
.  MPI_C_COMPLEX - float _Complex
.  MPI_C_DOUBLE_COMPLEX - double _Complex
-  MPI_C_LONG_DOUBLE_COMPLEX - long double _Complex

   The following are datatypes for the MPI functions 'MPI_MAXLOC' and
+I  MPI_FLOAT_INT - 'struct { float, int }'
.  MPI_LONG_INT  - 'struct { long, int }'
.  MPI_DOUBLE_INT - 'struct { double, int }'
.  MPI_SHORT_INT  - 'struct { short, int }'
.  MPI_2INT       - 'struct { int, int }'
-  MPI_LONG_DOUBLE_INT - 'struct { long double, int }'; this
  is an `optional` type, and may be set to 'MPI_DATATYPE_NULL'

   Special datatypes for C and Fortran
+I MPI_PACKED - For 'MPI_Pack' and 'MPI_Unpack'
. MPI_UB - For 'MPI_Type_struct'; an upper-bound indicator.  Removed in MPI 3
- MPI_LB - For 'MPI_Type_struct'; a lower-bound indicator. Removed in MPI 3

  Fortran datatypes:
- MPI_DOUBLE_COMPLEX - 'complex*16' (or 'complex*32') where supported.

  The following datatypes are optional
+I MPI_INTEGER1  - 'integer*1' if supported
. MPI_INTEGER2  - 'integer*2' if supported
. MPI_INTEGER4  - 'integer*4' if supported
. MPI_INTEGER8  - 'integer*8' if supported
. MPI_INTEGER16 - 'integer*16' if supported
. MPI_REAL4     - 'real*4' if supported
- MPI_REAL8     - 'real*8' if supported
. MPI_REAL16    - 'real*16' if supported
. MPI_COMPLEX8  - 'complex*8' if supported
. MPI_COMPLEX16 - 'complex*16' if supported
- MPI_COMPLEX32 - 'complex*32' if supported

   The following are datatypes for the MPI functions 'MPI_MAXLOC' and
   'MPI_MINLOC'.  In Fortran, these datatype always consist of
   two elements of the same Fortran type.

 MPI Datatypes for MPI Types
+I MPI_AINT - Datatype for an 'MPI_Aint'
. MPI_OFFSET - Datatype for an 'MPI_Offset'
- MPI_COUNT - Datatype for an 'MPI_Count'

 MPI Datatype Combiner Names:
+I MPI_COMBINER_NAMED            - a named predefined datatype

 MPI Datatype Type Classes:
 MPI Type classes used with routines to return Fortran types with defined
 precision and range

 MPI Darray and Subarray Values:
 These values are used to create a datatype with the 'DARRAY' and 'SUBARRAY'
+I MPI_ORDER_C              - Row-major order (as used by C)
. MPI_ORDER_FORTRAN        - Column-major order (as used by Fortran)
. MPI_DISTRIBUTE_BLOCK     - Block distribution
. MPI_DISTRIBUTE_CYCLIC    - Cyclic distribution
. MPI_DISTRIBUTE_NONE      - This dimension is not distributed
- MPI_DISTRIBUTE_DFLT_DARG - Use the default distribution

 Communicators are of type 'MPI_Comm' in C, 'INTEGER' in Fortran, and
 'Type(MPI_Comm)' in Fortran08
+I MPI_COMM_WORLD - Contains all of the processes
- MPI_COMM_SELF - Contains only the calling process

 Kind of communicator for 'MPI_COMM_SPLIT_TYPE':
.I MPI_COMM_TYPE_SHARED - All processes that can share memory are grouped into
 the same communicator.

 Groups are of type 'MPI_Group' in C, 'INTEGER' in Fortran,
 and 'Type(MPI_Group)' in Fortran08

.I MPI_GROUP_EMPTY - A group containing no members.

   Results of the compare operations on groups and communicators:
+I  MPI_IDENT - Identical
.  MPI_CONGRUENT  - (only for 'MPI_COMM_COMPARE') The groups are identical
.  MPI_SIMILAR - Same members, but in a different order
-  MPI_UNEQUAL - Different

 Collective operations:
 The collective combination operations (e.g., 'MPI_REDUCE', 'MPI_ALLREDUCE',
 'MPI_REDUCE_SCATTER', and 'MPI_SCAN') take a combination operation.
 This operation is of type 'MPI_Op' in C and of type 'INTEGER' in Fortran.
 The predefined operations are

+I  MPI_MAX - return the maximum
.  MPI_MIN - return the minumum
.  MPI_SUM - return the sum
.  MPI_PROD - return the product
.  MPI_LAND - return the logical and
.  MPI_BAND - return the bitwise and
.  MPI_LOR - return the logical or
.  MPI_BOR - return the bitwise of
.  MPI_LXOR - return the logical exclusive or
.  MPI_BXOR - return the bitwise exclusive or
.  MPI_MINLOC - return the minimum and the location (actually, the value of
                the second element of the structure where the minimum of
                the first is found)
.  MPI_MAXLOC - return the maximum and the location
.  MPI_REPLACE - replace b with a
-  MPI_NO_OP - perform no operation

Notes on collective operations:

The reduction functions ('MPI_Op') do not return an error value.  As a result,
if the functions detect an error, all they can do is either call 'MPI_Abort'
or silently skip the problem.  Thus, if you change the error handler from
'MPI_ERRORS_ARE_FATAL' to something else, for example, 'MPI_ERRORS_RETURN',
then no error may be indicated.

The reason for this is the performance problems in ensuring that
all collective routines return the same error value.

Note that not all datatypes are valid for these functions.  For example,
'MPI_COMPLEX' is not valid for 'MPI_MAX' and 'MPI_MIN'.  In addition, the MPI
1.1 standard did not include the C types 'MPI_CHAR' and 'MPI_UNSIGNED_CHAR'
among the lists of arithmetic types for operations like 'MPI_SUM'.  However,
since the C type 'char' is an integer type (like 'short'), it should have been
included.  The MPI Forum will probably include 'char' and 'unsigned char'
as a clarification to MPI 1.1; until then, users are advised that MPI
implementations may not accept 'MPI_CHAR' and 'MPI_UNSIGNED_CHAR' as valid
datatypes for 'MPI_SUM', 'MPI_PROD', etc.  MPICH does allow these datatypes.

 Permanent key values:
 These are the same in C and Fortran

+I MPI_TAG_UB - Largest tag value
. MPI_HOST - Rank of process that is host, if any
. MPI_IO - Rank of process that can do I/O
. MPI_WTIME_IS_GLOBAL - Has value 1 if 'MPI_WTIME' is globally synchronized.
. MPI_UNIVERSE_SIZE - Number of available processes.  See the standard for
   a description of limitations on this value
. MPI_LASTUSEDCODE - Last used MPI error code (check - code or class?)
- MPI_APPNUM - Application number, starting from 0.  See the standard for
 'MPI_COMM_SPAWN_MULTIPLE' and 'mpiexec' for details

  Null objects:
+I  MPI_COMM_NULL          - Null communicator
.  MPI_OP_NULL            - Null operation
.  MPI_GROUP_NULL         - Null group
.  MPI_DATATYPE_NULL      - Null datatype
.  MPI_REQUEST_NULL       - Null request
.  MPI_ERRHANDLER_NULL    - Null error handler
.  MPI_WIN_NULL           - Null window handle
.  MPI_FILE_NULL          - Null file handle
.  MPI_INFO_NULL          - Null info handle
.  MPI_MESSAGE_NULL       - Null message handle
.  MPI_ARGV_NULL          - Empty ARGV value for spawn commands
.  MPI_ARGVS_NULL         - Empty ARGV array for spawn-multiple command
.  MPI_T_ENUM_NULL        - Null MPI_T enum
.  MPI_T_CVAR_HANDLE_NULL - Null MPI_T control variable handle
.  MPI_T_PVAR_HANDLE_NULL - Null MPI_T performance variable handle
-  MPI_T_PVAR_SESSION_NULL- Null MPI_T performance variable session handle

 Predefined Constants:
+I MPI_MAX_PROCESSOR_NAME         - Maximum length of name returned by
. MPI_MAX_ERROR_STRING           - Maximum length of string return by
. MPI_MAX_LIBRARY_VERSION_STRING - Maximum length of string returned by
. MPI_MAX_PORT_NAME              - Maximum length of a port
. MPI_MAX_OBJECT_NAME            - Maximum length of an object (?)
. MPI_MAX_INFO_KEY               - Maximum length of an info key
. MPI_MAX_INFO_VAL               - Maximum length of an info value
. MPI_UNDEFINED                  - Used by many routines to indicated
  undefined or unknown integer value
. MPI_UNDEFINED_RANK             - Unknown rank
. MPI_KEYVAL_INVALID             - Special keyval that may be used to detect
   uninitialized keyvals.
. MPI_BSEND_OVERHEAD             - Add this to the size of a 'MPI_BSEND'
   buffer for each outstanding message
. MPI_PROC_NULL                  - This rank may be used to send or receive from no-one.
. MPI_ANY_SOURCE                 - In a receive, accept a message from anyone.
. MPI_ANY_TAG                    - In a receive, accept a message with any tag value.
. MPI_BOTTOM                     - May be used to indicate the bottom of the address space
. MPI_IN_PLACE                   - Special location for buffer in some
  collective communication routines
. MPI_VERSION                    - Numeric value of MPI version (e.g., 3)
- MPI_SUBVERSION                 - Numeric value of MPI subversion (e.g., 1)

  Topology types:
+I MPI_CART       - Cartesian grid
. MPI_GRAPH      - General graph
- MPI_DIST_GRAPH - General distributed graph

  Special values for distributed graph:
+I MPI_UNWEIGHTED    - Indicates that the edges are unweighted
- MPI_WEIGHTS_EMPTY - Special address that indicates no array of weights

 File Modes:
+I MPI_MODE_RDONLY          - Read only
. MPI_MODE_RDWR            - Read and write
. MPI_MODE_WRONLY          - Write only
. MPI_MODE_CREATE          - Create the file if it does not exist
. MPI_MODE_EXCL            - It is an error if creating a file that already
. MPI_MODE_DELETE_ON_CLOSE - Delete the file on close
. MPI_MODE_UNIQUE_OPEN     - The file will not be concurrently opened elsewhere
. MPI_MODE_APPEND          - The initial position of all file pointers is at
 the end of the file
- MPI_MODE_SEQUENTIAL      - File will only be accessed sequentially

 File Displacement:
.I MPI_DISPLACEMENT_CURRENT - Use with files opened with mode

File Positioning:
+I MPI_SEEK_SET             - Set the pointer to 'offset'
. MPI_SEEK_CUR             - Set the pointer to the current position plus 'offset'
- MPI_SEEK_END             - Set the pointer to the end of the file plus 'offset'

Window attributes:
+I MPI_WIN_BASE - window base address.
. MPI_WIN_SIZE - window size, in bytes
. MPI_WIN_DISP_UNIT - displacement unit associated with the window
. MPI_WIN_CREATE_FLAVOR - how the window was created
- MPI_WIN_MODEL - memory model for window

Window flavors:
+I MPI_WIN_FLAVOR_CREATE   - Window was created with MPI_WIN_CREATE.

Window Memory Model:
+I MPI_WIN_SEPARATE - Separate public and private copies of window memory
- MPI_WIN_UNIFIED - The publich and private copies are identical (by which
 we mean that updates are eventually observed without additional RMA operations)

Window Lock Types:
+I MPI_LOCK_EXCLUSIVE - Only one process at a time will execute accesses
 within the lock
- MPI_LOCK_SHARED - Not exclusive; multiple processes may execute accesses
 within the lock

Window Assertions:
 See section 11.5 in MPI 3.1 for a detailed description of each of these
 assertion values.
+I MPI_MODE_NOCHECK      - The matching calls to MPI_WIN_POST or MPI_WIN_START
 have already completed, or no process holds or will attempt to acquire, a
 conflicting lock.
. MPI_MODE_NOSTORE      - The local window has not been updated by stores
 since the last synchronization
. MPI_MODE_NOPUT        - The local window will not be updated by put or
 accumulate until the next synchronization
. MPI_MODE_NOPRECEDE    - The fence does not complete any locally issued RMA
- MPI_MODE_NOSUCCEED    - The fence does not start any locally issued RMA calls

Predefined Info Object:
.I MPI_INFO_ENV - Contains the execution environment

 MPI Status:
 The 'MPI_Status' datatype is a structure in C.  The three elements for use
 by programmers are
+I  MPI_SOURCE - Who sent the message
.  MPI_TAG - What tag the message was sent with
-  MPI_ERROR - Any error return (only when the error returned by the routine
  has error class 'MPI_ERR_IN_STATUS')

+I MPI_STATUS_IGNORE   - Ignore a single 'MPI_Status' argument
- MPI_STATUSES_IGNORE - Ignore an array of 'MPI_Status'

Special value for error codes array:
.I MPI_ERRCODES_IGNORE - Ignore an array of error codes

 MPI_T Constants:
+I    MPI_T_VERBOSITY_USER_BASIC     - Basic information of interest to users
.    MPI_T_VERBOSITY_USER_DETAIL    - Detailed information of interest to users
.    MPI_T_VERBOSITY_USER_ALL       - All remaining information of interest to users
.    MPI_T_VERBOSITY_TUNER_BASIC    - Basic information required for tuning
.    MPI_T_VERBOSITY_TUNER_DETAIL   - Detailed information required for tuning
.    MPI_T_VERBOSITY_TUNER_ALL      - All remaining information required for tuning
.    MPI_T_VERBOSITY_MPIDEV_BASIC   - Basic information for MPI implementors

.    MPI_T_VERBOSITY_MPIDEV_DETAIL  - Detailed information for MPI implementors
.    MPI_T_VERBOSITY_MPIDEV_ALL     - All remaining information for MPI implementors
.    MPI_T_BIND_NO_OBJECT           - Applies globally to entire MPI process
.    MPI_T_BIND_MPI_COMM            - MPI communicators
.    MPI_T_BIND_MPI_DATATYPE        - MPI datatypes
.    MPI_T_BIND_MPI_ERRHANDLER      - MPI error handlers
.    MPI_T_BIND_MPI_FILE            - MPI file handles
.    MPI_T_BIND_MPI_GROUP           - MPI groups
.    MPI_T_BIND_MPI_OP              - MPI reduction operators
.    MPI_T_BIND_MPI_REQUEST         - MPI requests
.    MPI_T_BIND_MPI_WIN             - MPI windows for one-sided communication
.    MPI_T_BIND_MPI_MESSAGE         - MPI message object
.    MPI_T_BIND_MPI_INFO            - MPI info object
.    MPI_T_SCOPE_CONSTANT           -read-only, value is constant
.    MPI_T_SCOPE_READONLY           - read-only, cannot be written, but can
.    MPI_T_SCOPE_LOCAL              - may be writeable, writing is a local
.    MPI_T_SCOPE_GROUP              - may be writeable, must be done to a
 group of processes, all processes in a group must be set to consistent values
.    MPI_T_SCOPE_GROUP_EQ           - may be writeable, must be done to a
 group of processes, all processes in a group must be set to the same value
.    MPI_T_SCOPE_ALL                - may be writeable, must be done to all
 processes, all connected processes must be set to consistent values
.    MPI_T_SCOPE_ALL_EQ             - may be writeable, must be done to all
 processes, all connected processes must be set to the same value
.    MPI_T_PVAR_CLASS_STATE         - set of discrete states (MPI_INT)
.    MPI_T_PVAR_CLASS_LEVEL         - utilization level of a resource
.    MPI_T_PVAR_CLASS_SIZE          - size of a resource
.    MPI_T_PVAR_CLASS_PERCENTAGE    - percentage utilization of a resource
.    MPI_T_PVAR_CLASS_HIGHWATERMARK - high watermark of a resource
.    MPI_T_PVAR_CLASS_LOWWATERMARK  - low watermark of a resource
.    MPI_T_PVAR_CLASS_COUNTER       - number of occurances of an event
.    MPI_T_PVAR_CLASS_AGGREGATE     - aggregate value over an event (e.g.,
 sum of all memory allocations)
.    MPI_T_PVAR_CLASS_TIMER         - aggretate time spent executing event
-    MPI_T_PVAR_CLASS_GENERIC       - used for any other time of performance

 Thread levels:
+I MPI_THREAD_SINGLE     - Only one thread executes
. MPI_THREAD_FUNNELED   - Only the main thread makes MPI calls
. MPI_THREAD_SERIALIZED - Only one thread at a time makes MPI calls
- MPI_THREAD_MULTIPLE   - Multiple threads may make MPI calls

 Special MPI types and functions:

+I MPI_Aint   - C type that holds any valid address.
. MPI_Count  - C type that holds any valid count.
. MPI_Offset - C type that holds any valid file offset.
. MPI_Handler_function - C function for handling errors (see
 'MPI_Errhandler_create') .
. MPI_User_function - C function to combine values (see collective operations
 and 'MPI_Op_create')
. MPI_Copy_function - Function to copy attributes (see 'MPI_Keyval_create')
. MPI_Delete_function - Function to delete attributes (see 'MPI_Keyval_create')
. MPI_ERRORS_ARE_FATAL - Error handler that forces exit on error
- MPI_ERRORS_RETURN - Error handler that returns error codes (as value of
 MPI routine in C and through last argument in Fortran)

 MPI Attribute Default Functions:
+I MPI_COMM_NULL_COPY_FN - Predefined attribute copy function for communicators
. MPI_COMM_NULL_DELETE_FN - Predefined attribute delete function for communicators
. MPI_COMM_DUP_FN  - Predefined attribute duplicate function for communicators
. MPI_WIN_NULL_COPY_FN - Predefined attribute copy function for windows
. MPI_WIN_NULL_DELETE_FN - Predefined attribute delete function for windows
. MPI_WIN_DUP_FN   - Predefined attribute duplicate function for windows
. MPI_TYPE_NULL_COPY_FN - Predefined attribute copy function for datatypes
. MPI_TYPE_NULL_DELETE_FN - Predefined attribute delete function for datatypes
- MPI_TYPE_DUP_FN - Predefined attribute duplicate function for datatypes

 MPI-1 Attribute Default Functions:
+I MPI_NULL_COPY_FN - Predefined copy function
. MPI_NULL_DELETE_FN - Predefined delete function
- MPI_DUP_FN - Predefined duplication function

 MPI Error classes:
+I   MPI_SUCCESS               - Successful return code
.   MPI_ERR_BUFFER            - Invalid buffer pointer
.   MPI_ERR_COUNT             - Invalid count argument
.   MPI_ERR_TYPE              - Invalid datatype argument
.   MPI_ERR_TAG               - Invalid tag argument
.   MPI_ERR_COMM              - Invalid communicator
.   MPI_ERR_RANK              - Invalid rank
.   MPI_ERR_ROOT              - Invalid root
.   MPI_ERR_GROUP             - Null group passed to function
.   MPI_ERR_OP                - Invalid operation
.   MPI_ERR_TOPOLOGY          - Invalid topology
.   MPI_ERR_DIMS              - Illegal dimension argument
.   MPI_ERR_ARG               - Invalid argument
.   MPI_ERR_UNKNOWN           - Unknown error
.   MPI_ERR_TRUNCATE          - Message truncated on receive
.   MPI_ERR_OTHER             - Other error; use Error_string
.   MPI_ERR_INTERN            - Internal error code
.   MPI_ERR_IN_STATUS         - Look in status for error value
.   MPI_ERR_PENDING           - Pending request
.   MPI_ERR_REQUEST           - Invalid mpi_request handle
.   MPI_ERR_ACCESS            - Permission denied
.   MPI_ERR_AMODE             - Error related to the amode passed to
.   MPI_ERR_BAD_FILE          - Invalid file name (e.g., path name too long)
.   MPI_ERR_CONVERSION        - An error occurred in a user supplied data
 conversion function
.   MPI_ERR_DUP_DATAREP       - Conversion functions could not be registered
 because a data representation identifier that was already defined was passed
.   MPI_ERR_FILE_EXISTS       - File exists
.   MPI_ERR_FILE_IN_USE       - File operation could not be completed, as
 the file is currently open by some process
.   MPI_ERR_FILE              - Invalid file handle
.   MPI_ERR_IO                - Other I/O error
.   MPI_ERR_NO_SPACE          - Not enough space
.   MPI_ERR_NO_SUCH_FILE      - File does not exist
.   MPI_ERR_READ_ONLY         - Read-only file or file system
.   MPI_ERR_UNSUPPORTED_DATAREP - Unsupported datarep passed to
.   MPI_ERR_INFO              - Invalid info argument
.   MPI_ERR_INFO_KEY          - Key longer than MPI_MAX_INFO_KEY
.   MPI_ERR_INFO_VALUE        - Value longer than MPI_MAX_INFO_VAL
.   MPI_ERR_INFO_NOKEY        - Invalid key passed to MPI_INFO_DELETE
.   MPI_ERR_NAME              - Invalid service name passed to MPI_LOOKUP_NAME
.   MPI_ERR_NO_MEM            - Alloc_mem could not allocate memory
.   MPI_ERR_NOT_SAME          - Collective argument not identical on all
 processes, or collective routines called in a different order by different
.   MPI_ERR_PORT              - Invalid port name passed to MPI_COMM_CONNECT
.   MPI_ERR_QUOTA             - Quota exceeded
.   MPI_ERR_SERVICE           - Invalid service name passed to MPI_UNPUBLISH_NAME
.   MPI_ERR_SPAWN             - Error in spawning processes
.   MPI_ERR_UNSUPPORTED_OPERATION - Unsupported operation, such as seeking on
 a file which supports sequential access only
.   MPI_ERR_WIN               - Invalid win argument
.   MPI_ERR_BASE              - Invalid base passed to MPI_FREE_MEM
.   MPI_ERR_LOCKTYPE          - Invalid locktype argument
.   MPI_ERR_KEYVAL            - Erroneous attribute key
.   MPI_ERR_RMA_CONFLICT      - Conflicting accesses to window
.   MPI_ERR_RMA_SYNC          - Wrong synchronization of RMA calls
.   MPI_ERR_SIZE              - Invalid size argument
.   MPI_ERR_DISP              - Invalid disp argument
.   MPI_ERR_ASSERT            - Invalid assert argument
.   MPI_ERR_RMA_RANGE         - Target memory is not part of the window (in
 the case of a window created with MPI_WIN_CREATE_DYNAMIC, target memory is
 not attached)
.   MPI_ERR_RMA_ATTACH        - Memory cannot be attached (e.g., because of
 resource exhaustion)
.   MPI_ERR_RMA_SHARED        - Memory cannot be shared (e.g., some process in
 the group of the specified communicator cannot expose shared memory)
.   MPI_ERR_RMA_FLAVOR        - Passed window has the wrong flavor for the
 called function
-   MPI_ERR_LASTCODE          - Last error code -- always at end

Error codes for MPI_T:

+I MPI_T_ERR_MEMORY            - Out of memory
. MPI_T_ERR_NOT_INITIALIZED   - Interface not initialized
. MPI_T_ERR_CANNOT_INIT       - Interface not in the state to be initialized
. MPI_T_ERR_INVALID_INDEX     - The index is invalid or has been deleted
. MPI_T_ERR_INVALID_ITEM      - Item index queried is out of range
. MPI_T_ERR_INVALID_HANDLE    - The handle is invalid
. MPI_T_ERR_OUT_OF_HANDLES    - No more handles available
. MPI_T_ERR_OUT_OF_SESSIONS   - No more sessions available
. MPI_T_ERR_INVALID_SESSION   - Session argument is not valid
. MPI_T_ERR_CVAR_SET_NOT_NOW  - Cvar can''t be set at this moment
. MPI_T_ERR_CVAR_SET_NEVER    - Cvar can''t be set until end of execution
. MPI_T_ERR_PVAR_NO_STARTSTOP - Pvar can''t be started or stopped
. MPI_T_ERR_PVAR_NO_WRITE     - Pvar can''t be written or reset
. MPI_T_ERR_PVAR_NO_ATOMIC    - Pvar can''t be R/W atomically
. MPI_T_ERR_INVALID_NAME      - Name doesn''t match
- MPI_T_ERR_INVALID           - Invalid use of the interface or bad parameter