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