MPI_Win_lock_all function

Starts an RMA access epoch to all processes in a window object, with a lock type of MPI_LOCK_SHARED.

Syntax

int MPIAPI MPI_Win_lock_all(
   int     assert,
   MPI_Win win
);

Parameters

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

• win
  Window object.

Return value

Returns MPI_SUCCESS on success. Otherwise, the return value is an error code.

In Fortran, the return value is stored in the IERROR parameter.

Fortran

    MPI_WIN_LOCK_ALL(ASSERT, WIN, IERROR)
        INTEGER ASSERT, WIN, IERROR

Remarks

During the epoch, the calling process can access the window memory on all processes in win by using RMA operations. A window locked with MPI_Win_lock_all must be unlocked with MPI_Win_unlock_all. This routine is not collective — the all refers to a lock on all members of the group of the window.

Requirements

Product	HPC Pack 2012 MS-MPI Redistributable Package, HPC Pack 2008 R2 MS-MPI Redistributable Package, HPC Pack 2008 MS-MPI Redistributable Package or HPC Pack 2008 Client Utilities
Header	Mpi.h; Mpif.h
Library	Msmpi.lib
DLL	Msmpi.dll

See also

MPI One-Sided Communications Functions