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# core.sync.barrier

The barrier module provides a primitive for synchronizing the progress of a group of threads.
License:
Boost License 1.0
Authors:
Sean Kelly

Source core/sync/barrier.d

class `Barrier`;
  This class represents a barrier across which threads may only travel in groups of a specific size.
  Examples:

      import core.thread;

      int  numThreads = 10;
      auto barrier    = new Barrier( numThreads );
      auto synInfo    = new Object;
      int  numReady   = 0;
      int  numPassed  = 0;

      void threadFn()
      {
          synchronized( synInfo )
          {
              ++numReady;
          }
          barrier.wait();
          synchronized( synInfo )
          {
              ++numPassed;
          }
      }

      auto group = new ThreadGroup;

      for ( int i = 0; i < numThreads; ++i )
      {
          group.create( &threadFn );
      }
      group.joinAll();
      assert( numReady == numThreads && numPassed == numThreads );

  this(uint `limit`);
    Initializes a barrier object which releases threads in groups of limit in size.
    Parameters:

    uint `limit` | The number of waiting threads to release in unison.

    Throws:
    SyncError on error.
  void `wait`();
    Wait for the pre-determined number of threads and then proceed.
    Throws:
    SyncError on error.

Copyright © 1999-2020 by the D Language Foundation | Page generated by Ddoc on Thu Jun 11 11:22:44 2020