17.2.287. MPI_Query_thread

MPI_Query_thread - Returns the current level of thread support

17.2.287.1. SYNTAX

17.2.287.1.1. C Syntax

#include <mpi.h>

int MPI_Query_thread(int *provided)

17.2.287.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_QUERY_THREAD(PROVIDED, IERROR)
     INTEGER PROVIDED, IERROR

17.2.287.1.3. Fortran 2008 Syntax

USE mpi_f08
MPI_Query_thread(provided, ierror)
     INTEGER, INTENT(OUT) :: provided
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.287.2. OUTPUT PARAMETERS

  • provided: C/Fortran only: Level of thread support (integer).

  • IERROR: Fortran only: Error status (integer).

17.2.287.3. DESCRIPTION

This routine returns in provided the current level of thread support. If MPI was initialized by a call to MPI_Init_thread, provided will have the same value as was returned by that function.

The possible values of provided are as follows:

MPI_THREAD_SINGLE

Only one thread may execute.

MPI_THREAD_FUNNELED

If the process is multithreaded, only the thread that called MPI_Init[_thread] may make MPI calls.

MPI_THREAD_SERIALIZED

If the process is multithreaded, only one thread may make MPI library calls at one time.

MPI_THREAD_MULTIPLE

If the process is multithreaded, multiple threads may call MPI at once with no restrictions.

17.2.287.4. NOTES

In Open MPI, provided is always MPI_THREAD_SINGLE, unless the program has been linked with the multithreaded library, in which case provided is MPI_THREAD_MULTIPLE.

17.2.287.5. ERRORS

Almost all MPI routines return an error value; C routines as the return result of the function and Fortran routines in the last argument.

Before the error value is returned, the current MPI error handler associated with the communication object (e.g., communicator, window, file) is called. If no communication object is associated with the MPI call, then the call is considered attached to MPI_COMM_SELF and will call the associated MPI error handler. When MPI_COMM_SELF is not initialized (i.e., before MPI_INIT / MPI_INIT_THREAD, after MPI_FINALIZE, or when using the Sessions Model exclusively) the error raises the initial error handler. The initial error handler can be changed by calling MPI_COMM_SET_ERRHANDLER on MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI argument to mpiexec or info key to MPI_COMM_SPAWN[_MULTIPLE]. If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error handler is called for all other MPI functions.

In the sessions model, the error handler can be set during MPI_Session_init.

Open MPI includes three predefined error handlers that can be used:

MPI_ERRORS_ARE_FATAL: Causes the program to abort all connected MPI processes.
MPI_ERRORS_ABORT:     An error handler that can be invoked on a communicator,
                      window, file, or session. When called on a communicator, it
                      acts as if MPI_ABORT was called on that communicator. If
                      called on a window or file, acts as if MPI_ABORT was called
                      on a communicator containing the group of processes in the
                      corresponding window or file. If called on a session,
                      aborts only the local process.
MPI_ERRORS_RETURN:    Returns an error code to the application.

MPI applications can also implement their own error handlers.

Custom MPI error handlers can be created by calling: MPI_Comm_create_errhandler(3) MPI_File_create_errhandler(3) MPI_Session_create_errhandler(3) MPI_Win_create_errhandler(3)

Predefined and custom error handlers can be set by calling: MPI_Comm_set_errhandler(3) MPI_File_set_errhandler(3) MPI_Session_set_errhandler(3) MPI_Win_set_errhandler(3)

Note that MPI does not guarantee that an MPI program can continue past an error.

See the MPI man page for a full list of MPI error codes.

See the Error Handling section of the MPI-3 standard for more information.