共用方式為

2.4.3 single Construct

  • 發行項

The single directive identifies a construct that specifies that the associated structured block is executed by only one thread in the team (not necessarily the master thread). The syntax of the single directive is as follows:

#pragma omp single [clause[[,] clause] ...] new-line
   structured-block

The clause is one of the following:

private(variable-list)

firstprivate(variable-list)

copyprivate(variable-list)

nowait

There is an implicit barrier after the single construct unless a nowait clause is specified.

Restrictions to the single directive are as follows:

  • Only a single nowait clause can appear on a single directive.

  • The copyprivate clause must not be used with the nowait clause.

Cross References:

  • private, firstprivate, and copyprivate clauses, see Section 2.7.2 on page 25.