MPI_Ibarrier function

Performs a barrier synchronization across all members of a group in a non-blocking way.

Syntax

int MPIAPI MPI_Ibarrier(
  _In_  MPI_Comm    comm,
  _Out_ MPI_Request *request
);

Parameters

• comm [in]
  MPI_COMM communicator handle.

• request [out]
  MPI_Request handle representing the communication operation.

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_IBARRIER(COMM, REQUEST, IERROR)
        INTEGER COMM, REQUEST, IERROR

Remarks

A non-blocking call initiates a collective barrier operation which must be completed in a separate completion call. Once initiated, the operation may progress independently of any computation or other communication at participating processes. In this manner, non-blocking barrier operations can mitigate possible synchronizing effects of barrier operations by running them in the “background.”

All completion calls (e.g., MPI_Wait) are supported for non-blocking barrier operations.

Requirements

Product	Microsoft MPI v6
Header	Mpi.h; Mpif.h
Library	Msmpi.lib
DLL	Msmpi.dll

See also

MPI Collective Functions

MPI_Barrier

MPI_Test

MPI_Testall

MPI_Testany

MPI_Testsome

MPI_Wait

MPI_Waitall

MPI_Waitany

MPI_Waitsome

MPI_Comm