MPI_Testall(3) Open MPI MPI_Testall(3)
NAME
MPI_Testall - Tests for the completion of all previously initiated com-
munications in a list.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Testall(int count, MPI_Request array_of_requests[],
int *flag, MPI_Status array_of_statuses[])
Fortran Syntax
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
Fortran 2008 Syntax
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
C++ Syntax
#include <mpi.h>
static bool Request::Testall(int count, Request
array_of_requests[], Status array_of_statuses[])
static bool Request::Testall(int count, Request array_of_requests[])
INPUT PARAMETERS
count Lists length (integer).
array_of_requests
Array of requests (array of handles).
OUTPUT PARAMETERS
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).
DESCRIPTION
Returns flag = true if all communications associated with active han-
dles in the array have completed (this includes the case where no han-
dle in the list is active). In this case, each status entry that corre-
sponds to an active handle request is set to the status of the corre-
sponding 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 inac-
tive 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_STA-
TUSES_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.
NOTE
flag is true only if all requests have completed. Otherwise, flag is
false, and neither array_of_requests nor array_of_statuses is modified.
ERRORS
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). How-
ever, all requests that generate an exception will have a relevant er-
ror 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 er-
ror 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 con-
tinue 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 For-
tran bindings. In C++, if the predefined error handler MPI::ER-
RORS_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.
SEE ALSO
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
4.1.2 Nov 24, 2021 MPI_Testall(3)
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