OpenMP Directives: Clauses/Directives Summary

The table below summarizes which clauses are accepted by which OpenMP directives.

Clause	Directive
	PARALLEL	DO/for	SECTIONS	SINGLE	PARALLEL DO/for	PARALLEL SECTIONS
IF	♦				♦	♦
PRIVATE	♦	♦	♦	♦	♦	♦
SHARED	♦	♦			♦	♦
DEFAULT	♦				♦	♦
FIRSTPRIVATE	♦	♦	♦	♦	♦	♦
LASTPRIVATE		♦	♦		♦	♦
REDUCTION	♦	♦	♦		♦	♦
COPYIN	♦				♦	♦
COPYPRIVATE				♦
SCHEDULE		♦			♦
ORDERED		♦			♦
NOWAIT		♦	♦	♦

The following OpenMP directives do not accept clauses:

• MASTER
• CRITICAL
• BARRIER
• ATOMIC
• FLUSH
• ORDERED
• THREADPRIVATE

Implementations may (and do) differ from the standard in which clauses are supported by each directive.