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MPI_Win_post(3) man page (version 5.0.0rc2)

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Name

MPI_Win_post - Starts an RMA exposure epoch for the local window

associated with win

Syntax

C Syntax


#include <mpi.h>
int MPI_Win_post(MPI_Group group, int assert, MPI_Win win)

Fortran Syntax


USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_WIN_POST(GROUP, ASSERT, WIN, IERROR)
    INTEGER GROUP, ASSERT, WIN, IERROR

Fortran 2008 Syntax


USE mpi_f08
MPI_Win_post(group, assert, win, ierror)
    TYPE(MPI_Group), INTENT(IN) :: group
    INTEGER, INTENT(IN) :: assert
    TYPE(MPI_Win), INTENT(IN) :: win
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror

Input Parameters

group
The group of origin processes (handle)
assert
Program assertion (integer)
win
Window object (handle)

Output Parameters

IERROR
Fortran only: Error status (integer).

Description

Starts an RMA exposure epoch for the local window associated with win. Only the processes belonging to group should access the window with RMA calls on win during this epoch. Each process in group must issue a matching call to MPI_Win_start. MPI_Win_post does not block.

The assert argument is used to provide assertions on the context of the call that may be used for various optimizations. A value of assert = 0 is always valid. The following assertion values are supported:

MPI_MODE_NOCHECK
The matching calls to MPI_Win_start have not yet occurred on any origin processes when this call is made. This assertion must be present for all matching MPI_Win_start calls if used.
MPI_MODE_NOSTORE
Informs that the local window was not updated by local stores or get calls in the preceding epoch.
MPI_MODE_NOPUT
Informs that the local window will not be updated by put or accummulate calls until the ensuing wait synchronization.

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.

See Also

MPI_Win_start MPI_Win_wait


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