インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
Parallel Directive Clause: Specifies that threads may resume execution before the execution of the region completes.
NOWAIT
When you specify this clause, it removes the synchronization barrier implied at the end of the region.
Note that NOWAIT can also be specified as a keyword in several directives.
At most one NOWAIT clause or keyword can appear in a directive that allows the clause or keyword.