HP aC++/HP C A.06.20 Programmer's Guide

OMP CRITICAL Pragma
#pragma omp critical [(name)]
structured-block
The critical pragma identifies a construct that restricts the execution of the associated
structured block to one thread at a time.
The name parameter is optional. All unnamed critical sections map to the same name.
OMP FOR Pragma
#pragma omp for [clause1,clause2, ...]
for-loop
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)
• ordered
• schedule(kind[,chunksize])
• nowait
See “OpenMP Clauses” (page 147) for more information.
OMP FLUSH Pragma
#pragma omp flush [(list)]
where (list) names the variables that will be synchronized.
The flush pragma, whether explicit or implied, specifies a cross-thread sequence point
at which the implementation is required to ensure that all the threads in a team have
a consistent view of certain objects in the memory. A flush directive without a list is
implied for the following directives:
• barrier
• an entry to and exit from critical
• at entry to and exit from ordered
• at entry to and exit from parallel
• at entry to and exit from parallel for
• at entry to and exit from parallel sections
• at exit from single
• at exit from for
• at exit from sections
144 Pragma Directives and Attributes