Tests for the completion of all previously initiated communications


#include "mpi.h"
int MPI_Testall( count, array_of_requests, flag, array_of_statuses )
int        count;
MPI_Request array_of_requests[];
int        *flag;
MPI_Status *array_of_statuses;

Input Parameters

count - lists length (integer)
array_of_requests - array of requests (array of handles)

Output Parameters

flag - (logical)
array_of_statuses - array of status objects (array of Status)


flag is true only if all requests have completed. Otherwise, flag is false and neither the array_of_requests nor the array_of_statuses is modified.

Note on status for send operations

For send operations, the only use of status is for MPI_Test_cancelled or in the case that there is an error, in which case the MPI_ERROR field of status will be set.

Notes for Fortran

All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement.

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.


All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Errhandler_set; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error.

MPI_SUCCESS - No error; MPI routine completed successfully.
MPI_ERR_IN_STATUS - The actual error value is in the MPI_Status argument. This error class is returned only from the multiple-completion routines (MPI_Testall, MPI_Testany, MPI_Testsome, MPI_Waitall, MPI_Waitany, and MPI_Waitsome). The field MPI_ERROR in the status argument contains the error value or MPI_SUCCESS (no error and complete) or MPI_ERR_PENDING to indicate that the request has not completed.