OpenMP Synchronization (2)

• Explicit directives provide finer control

  • BARRIER — must be hit by all threads in team
  • CRITICAL (name), END CRITICAL —
  • Only one thread may enter at a time
  • ATOMIC — Single-statement critical section
  • for reduction
  • FLUSH (list) — “Synchronization point at
  • which the implementation is required to
  • provide a consistent view of memory”
  • ORDERED — For pipelining loop iterations

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