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MPI_Testall - Tests for the completion of all previously initiated
communications in a list.
#include <mpi.h>
int MPI_Testall(int count, MPI_Request array_of_requests[],
int *flag, MPI_Status array_of_statuses[])
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_TESTALL(COUNT, ARRAY_OF_REQUESTS, FLAG, ARRAY_OF_STATUSES,
IERROR)
LOGICAL FLAG
INTEGER COUNT, ARRAY_OF_REQUESTS(*)
INTEGER ARRAY_OF_STATUSES(MPI_STATUS_SIZE,*), IERROR
USE mpi_f08
MPI_Testall(count, array_of_requests, flag, array_of_statuses, ierror)
INTEGER, INTENT(IN) :: count
TYPE(MPI_Request), INTENT(INOUT) :: array_of_requests(count)
LOGICAL, INTENT(OUT) :: flag
TYPE(MPI_Status) :: array_of_statuses(*)
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- count
- Lists length (integer).
- array_of_requests
- Array of
requests (array of handles).
- flag
- True if previously initiated
communications are complete (logical.)
- array_of_statuses
- Array of status
objects (array of status).
- IERROR
- Fortran only: Error status (integer).
Returns flag = true if all communications associated with active
handles in the array have completed (this includes the case where no handle
in the list is active). In this case, each status entry that corresponds
to an active handle request is set to the status of the corresponding communication;
if the request was allocated by a nonblocking communication call then it
is deallocated, and the handle is set to MPI_REQUEST_NULL. Each status entry
that corresponds to a null or inactive handle is set to empty.
Otherwise,
flag = false is returned, no request is modified and the values of the
status entries are undefined. This is a local operation.
If your application
does not need to examine the array_of_statuses field, you can save resources
by using the predefined constant MPI_STATUSES_IGNORE can be used as a special
value for the array_of_statuses argument.
Errors that occurred during the
execution of MPI_Testall are handled in the same manner as errors in MPI_Waitall.
flag is true only if all requests have completed. Otherwise, flag is
false, and neither array_of_requests nor array_of_statuses is modified.
For each invocation of MPI_Testall, if one or more requests generate
an MPI exception, only the first MPI request that caused an exception will
be passed to its corresponding error handler. No other error handlers will
be invoked (even if multiple requests generated exceptions). However, all
requests that generate an exception will have a relevant error code set
in the corresponding status.MPI_ERROR field (unless MPI_STATUSES_IGNORE
was used).
The default error handler aborts the MPI job, except for I/O
function errors. The error handler may be changed with MPI_Comm_set_errhandler,
MPI_File_set_errhandler, or MPI_Win_set_errhandler (depending on the type
of MPI handle that generated the MPI request); 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.
If the invoked error handler allows MPI_Testall to return to the caller,
the value MPI_ERR_IN_STATUS will be returned in the C and Fortran bindings.
In C++, if the predefined error handler MPI::ERRORS_THROW_EXCEPTIONS is
used, the value MPI::ERR_IN_STATUS will be contained in the MPI::Exception
object. The MPI_ERROR field can then be examined in the array of returned
statuses to determine exactly which request(s) generated an exception.
MPI_Comm_set_errhandler
MPI_File_set_errhandler
MPI_Test
MPI_Testany
MPI_Testsome
MPI_Wait
MPI_Waitall
MPI_Waitany
MPI_Waitsome
MPI_Win_set_errhandler
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