# 4.3. Barrier synchronization

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MPI_BARRIER( comm )
[ IN comm] communicator (handle)

`int MPI_Barrier(MPI_Comm comm )
`

`MPI_BARRIER(COMM, IERROR)
INTEGER COMM, IERROR
`

MPI_BARRIER 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.

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MPI-1.1 of June 12, 1995
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