- Page Index
- 1. Short Description
- 2. Syntax
- 2.1. C syntax
- 2.2. C++ syntax
- 3. Parameters
- 3.1. Input
- 4. Description
- 5. Errors
MPI_Barrier
Short Description
Blocks until all processes have reached this routine.
Syntax
C syntax
#include <mpi.h> int MPI_Barrier(MPI_Comm comm)
C++ syntax
#include <mpi.h> void MPI::Comm::Barrier() const = 0
Parameters
Input
| comm | Communicator (handle). |
Description
Blocks the caller until all group members have called it; the call returns at any process only after all group members have entered the call.
The next animation shows how it works
(Click on the image to watch the animation) Errors
| MPI_SUCCESS | No error; MPI routine completed successfully. |
| MPI_ERR_COMM | Invalid communicator. A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank). |