HP aC++/HP C Programmer's Guide (B3901-90036; A.06.26; September 2011)

where [clause1, clause2, ...] indicates that the clauses are optional. There can be
zero or more clauses.
The parallel sections pragma is a shortcut for specifying a parallel clause
containing a single sections pragma. parallel sections admits all the allowable
clauses of the parallel pragma and the sections pragma except for the nowait
clause.
OMP SECTIONS Pragma
#pragma omp sections [clause1, clause2, ...]
{
#pragma omp section
[ structured-block ]
[#pragma omp section
structured-block ]
. . .
}
where [clause1, clause2, ...] indicates that the clauses are optional. There can
be zero or more clauses. clause may be one of the following:
• private(list)
• firstprivate(list)
• lastprivate(list)
• reduction(op:list)
• nowait
The section or sections pragmas identify a construct that specifies a set of constructs
to be divided among threads in a team. Each section is executed by one of the threads
in the team.
OMP SINGLE Pragma
#pragma omp single [clause1, clause2, . . .]
[ structured-block ]
where [clause1, clause2, ...] indicates that the clauses are optional. There can
be zero or more clauses.
clause may be one of the following:
• private(list)
• firstprivate(list)
• copyprivate(list)
• nowait
The single directive identifies a construct that specifies the associated structured block
that is executed by only one thread in the team (not necessarily the master thread).
138 Pragma Directives and Attributes