# blacs_barrier

Holds up execution of all processes within the indicated scope.

## Syntax

call blacs_barrier( icontxt, scope )

## Input Parameters

icontxt | INTEGER. Integer handle that indicates the context.
scope | CHARACTER*1. Parameter that indicates whether a process row (`scope='R'`), column (`'C'`), or entire grid (`'A'`) will participate in the barrier.

## Description

This routine holds up execution of all processes within the indicated scope until they have all called the routine.

Parent topic: Miscellaneous Routines