.TH MPI_Win_post 3 "11/12/2019" " " "MPI"

.SH NAME

MPI_Win_post \-  Start an RMA exposure epoch 

.SH SYNOPSIS

.nf

int MPI_Win_post(MPI_Group group, int assert, MPI_Win win)

.fi

.SH INPUT PARAMETERS

.PD 0

.TP

.B group 

- group of origin processes (handle)

.PD 1

.PD 0

.TP

.B assert 

- Used to optimize this call; zero may be used as a default.

See notes. (integer)

.PD 1

.PD 0

.TP

.B win 

- window object (handle)

.PD 1

.SH NOTES

The 

.I assert

argument is used to indicate special conditions for the

fence that an implementation may use to optimize the 

.I MPI_Win_post

operation.  The value zero is always correct.  Other assertion values

may be or'ed together.  Assertions that are valid for 

.I MPI_Win_post

are:

.PD 0

.TP

.B MPI_MODE_NOCHECK 

- the matching calls to 

.I MPI_WIN_START

have not yet

occurred on any origin processes when the call to 

.I MPI_WIN_POST

is made.

The nocheck option can be specified by a post call if and only if it is

specified by each matching start call.

.PD 1

.PD 0

.TP

.B MPI_MODE_NOSTORE 

- the local window was not updated by local stores (or

local get or receive calls) since last synchronization. This may avoid

the need for cache synchronization at the post call.

.PD 1

.PD 0

.TP

.B MPI_MODE_NOPUT 

- the local window will not be updated by put or accumulate

calls after the post call, until the ensuing (wait) synchronization. This

may avoid the need for cache synchronization at the wait call.

.PD 1

.SH NOTES FOR FORTRAN

All MPI routines in Fortran (except for 

.I MPI_WTIME

and 

.I MPI_WTICK

) have

an additional argument 

.I ierr

at the end of the argument list.  

.I 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

.I call

statement.

All MPI objects (e.g., 

.I MPI_Datatype

, 

.I MPI_Comm

) are of type 

.I INTEGER

in Fortran.

.SH ERRORS

All MPI routines (except 

.I MPI_Wtime

and 

.I 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 

.I MPI_Comm_set_errhandler

(for communicators),

.I MPI_File_set_errhandler

(for files), and 

.I MPI_Win_set_errhandler

(for

RMA windows).  The MPI-1 routine 

.I MPI_Errhandler_set

may be used but

its use is deprecated.  The predefined error handler

.I MPI_ERRORS_RETURN

may be used to cause error values to be returned.

Note that MPI does 

.B not

guarentee that an MPI program can continue past

an error; however, MPI implementations will attempt to continue whenever

possible.

.PD 0

.TP

.B MPI_SUCCESS 

- No error; MPI routine completed successfully.

.PD 1