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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

1. Introduction 

This document specifies a collection of compiler directives, library functions, and environment variables that can be used to specify shared-memory parallelism in C and C++ programs. The functionality described in this document is collectively known as the OpenMP C/C++ Application Program Interface (API). The goal of this specification is to provide a model for parallel programming that allows a program to be portable across shared-memory architectures from different vendors. The OpenMP C/C++ API will be supported by compilers from numerous vendors. More information about OpenMP, including the OpenMP Fortran Application Program Interface, can be found at the following web site:


The directives, library functions, and environment variables defined in this document will allow users to create and manage parallel programs while permitting portability. The directives extend the C and C++ sequential programming model with single program multiple data (SPMD) constructs, work-sharing constructs, and synchronization constructs, and they provide support for the sharing and privatization of data. Compilers that support the OpenMP C and C++ API will include a command-line option to the compiler that activates and allows interpretation of all OpenMP compiler directives.

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