JavaScript is required to for searching.
Skip Navigation Links
Exit Print View
Oracle Solaris Studio 12.2: C User's Guide
search filter icon
search icon

Document Information


1.  Introduction to the C Compiler

2.  C-Compiler Implementation-Specific Information

3.  Parallelizing C Code

3.1 Overview

3.1.1 Example of Use

3.2 Parallelizing for OpenMP

3.2.1 Handling OpenMP Runtime Warnings

3.3 Environment Variables





3.3.5 Using restrict in Parallel Code

3.4 Data Dependence and Interference

3.4.1 Parallel Execution Model

3.4.2 Private Scalars and Private Arrays

3.4.3 Storeback

3.4.4 Reduction Variables

3.5 Speedups

3.5.1 Amdahl's Law Overheads Gustafson's Law

3.6 Load Balance and Loop Scheduling

3.6.1 Static or Chunk Scheduling

3.6.2 Self Scheduling

3.6.3 Guided Self Scheduling

3.7 Loop Transformations

3.7.1 Loop Distribution

3.7.2 Loop Fusion

3.7.3 Loop Interchange

3.8 Aliasing and Parallelization

3.8.1 Array and Pointer References

3.8.2 Restricted Pointers

3.8.3 Explicit Parallelization and Pragmas Serial Pragmas Parallel Pragma

Nesting of for Loops

Eligibility for Parallelizing

Number of Processors

Classifying Variables

Default Scoping Rules for private and shared Variables

private Variables

shared Variables

readonly Variables

storeback Variables


reduction Variables

Scheduling Control

3.9 Memory Barrier Intrinsics

4.  lint Source Code Checker

5.  Type-Based Alias Analysis

6.  Transitioning to ISO C

7.  Converting Applications for a 64-Bit Environment

8.  cscope: Interactively Examining a C Program

A.  Compiler Options Grouped by Functionality

B.  C Compiler Options Reference

C.  Implementation-Defined ISO/IEC C99 Behavior

D.  Supported Features of C99

E.  Implementation-Defined ISO/IEC C90 Behavior

F.  ISO C Data Representations

G.  Performance Tuning

H.  The Differences Between K&R Solaris Studio C and Solaris Studio ISO C


3.2 Parallelizing for OpenMP

The C compiler accepts the OpenMP API for shared memory parallelization natively. The API consists of a set of parallelization pragmas. Information on the OpenMP API specification is at the OpenMP web site,

To enable the compiler’s OpenMP support and recognition of the OpenMP pragmas, compile with the -xopenmp option. Without -xopenmp, the compiler treats the OpenMP pragmas as comments. See B.2.123 -xopenmp[=i].

See the Solaris Studio OpenMP API User’s Guide for details.

3.2.1 Handling OpenMP Runtime Warnings

The OpenMP runtime system can issue warnings for non-fatal errors. Use the following function to register a call back function to handle these warnings:

int sunw_mp_register_warn(void (*func) (void *) )

You can access the prototype for this function by issuing a #include preprocessor directive for <sunw_mp_misc.h>.

If you do not want to register a function, set the environment variable SUNW_MP_WARN to TRUE and the warning messages are sent to stderr. For more information on SUNW_MP_WARN, see 3.3.3 SUNW_MP_WARN.

For information specific to this implementation of OpenMP, see the Solaris Studio OpenMP API User’s Guide.