labBarrier - Block execution until all labs reach this call

Syntax

labBarrier

Description

labBarrier blocks execution of a parallel algorithm until all labs have reached the call to labBarrier. This is useful for coordinating access to shared resources such as file I/O.

For a demonstration that uses labSend, labReceive, labBarrier, and labSendReceive, see the demo Profiling Explicit Parallel Communication.

Examples

In this example, all labs know the shared data filename.

fname = 'c:\data\datafile.mat';

Lab 1 writes some data to the file, which all other labs will read.

if labindex == 1
    data = randn(100, 1);
    save(fname, 'data');
    pause(5) %allow time for file to become available to other labs
end

All labs wait until all have reached the barrier; this ensures that no lab attempts to load the file until lab 1 writes to it.

labBarrier;
load(fname);

See Also

labBroadcast | labReceive | labSend | labSendReceive

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