Basic HTML version of Foils prepared August 29 98

Foil 18 OpenMP Synchronization (2)

From Designing and Building Parallel Programs 2: openMP Shared Memory Programming Language DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel(Some foils prepared by Kuck & Associates, Inc.)
1 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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