17.2.459. MPI_Win_test

MPI_Win_test - Attempts to complete an RMA exposure epoch; a nonblocking version of MPI_Win_wait

17.2.459.1. SYNTAX

17.2.459.1.1. C Syntax

#include <mpi.h>

int MPI_Win_test(MPI_Win win, int *flag)

17.2.459.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_WIN_TEST( WIN, FLAG, IERROR)
     INTEGER  WIN, IERROR

17.2.459.1.3. Fortran 2008 Syntax

USE mpi_f08
MPI_Win_test(win, flag, ierror)
     TYPE(MPI_Win), INTENT(IN) :: win
     LOGICAL, INTENT(OUT) :: flag
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.459.2. INPUT PARAMETERS

  • win: Window object (handle)

17.2.459.3. OUTPUT PARAMETERS

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

  • flag: The returning state of the test for epoch closure.

17.2.459.4. DESCRIPTION

MPI_Win_test is a one-sided MPI communication synchronization call, a nonblocking version of MPI_Win_wait. It returns flag = true if MPI_Win_wait would return, flag = false otherwise. The effect of return of MPI_Win_test with flag = true is the same as the effect of a return of MPI_Win_wait. If flag = false is returned, then the call has no visible effect.

Invoke MPI_Win_test only where MPI_Win_wait can be invoked. Once the call has returned flag = true, it must not be invoked anew, until the window is posted anew.

17.2.459.5. ERRORS

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

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Win_set_errhandler; 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.