HP aC++/HP C A.06.28 Programmer's Guide Integrity servers (769150-001, March 2014)

ordered
ordered
The ordered clause must be present when ordered directives bind to the for construct.
schedule
schedule(kind[,chunksize])
The schedule clause specifies how iterations of the for loop are divided among threads of the
team. The kind of schedule can be: static, dynamic, guided, or runtime. chunksize
should be a loop invariant integer expression.
num_threads
num_threads(interger-expression)
The num_threads clause allows a user to request a specific number of threads for a parallel
construct. If the num_threads clause is present, then the value of the integer expression is the
number of threads requested.
Attributes
__attribute__ is a language feature that allows you to add attributes to functions (or with the
aligned attribute, to variables or structure fields). The capabilities are similar to those of #pragma.
It is more integrated into the language syntax than pragmas and its placement in the source code
depends on the construct to which the attribute is being applied.
The attributes supported are:
• aligned
• malloc
• non_exposing
• noreturn
• format
• visibility
• warn_unused_result
attribute aligned
__attribute__ (aligned (alignment))
The aligned attribute specifies the minimum alignment for a variable or structure field, measured
in bytes. For example, the following declaration causes the compiler to allocate the global variable
x on a 16-byte boundary:
int x __attribute__ ((aligned (16))) = 0;
You can also specify the alignment of structure fields. For example, the following causes the compiler
to allocate the field member "x" to be aligned on a 128-byte boundary:
struct foo { int x[2] __attribute__ ((aligned (128)));}
The maximum alignment that can be specified is 128. This feature is for compatibility with gcc.
attribute malloc
__attribute__ ((malloc))
The malloc attribute is used to improve optimization by telling the compiler that:
116 Pragma Directives and Attributes