order Clause

| OPENMP API Specification: "Version 5.2 -- GIT rev 95b2e3a44"

10.3 order Clause


Name: order	Properties: unique

Arguments


Name	Type	Properties

ordering	Keyword: concurrent	default

Modiﬁers


Name	Modiﬁes	Type	Properties

order-modiﬁer	ordering	Keyword: reproducible, unconstrained	default

Directives

distribute, do, for, loop, simd

Semantics

The order clause speciﬁes an ordering of execution for the iterations of the associated loops of a loop-associated directive. If ordering is concurrent, the logical iterations of the associated loops may execute in any order, including concurrently.

The order-modiﬁer on the order clause aﬀects the schedule speciﬁcation for the purpose of determining its consistency with other schedules (see Section 4.4.5). If order-modiﬁer is reproducible, the loop schedule for the construct on which the clause appears is reproducible, whereas if order-modiﬁer is unconstrained, the loop schedule is not reproducible.

Restrictions

Restrictions to the order clause are as follows:

The only constructs that may be encountered inside a region that corresponds to a construct with an order clause that speciﬁes concurrent are the loop construct, the parallel construct, the simd construct, and combined constructs for which the ﬁrst construct is a parallel construct.
A region that corresponds to a construct with an order clause that speciﬁes concurrent may not contain calls to procedures that contain OpenMP directives.
A region that corresponds to a construct with an order clause that speciﬁes concurrent may not contain OpenMP runtime API calls.
If a threadprivate variable is referenced inside a region that corresponds to a construct with an order clause that speciﬁes concurrent, the behavior is unspeciﬁed.

Cross References

distribute directive, see Section 11.6
do directive, see Section 11.5.2
for directive, see Section 11.5.1
loop directive, see Section 11.7
simd directive, see Section 10.4

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