OpenMP* Fortran Compiler Directives

Intel® Fortran provides OpenMP* Fortran compiler directives that comply with OpenMP Fortran Application Program Interface (API) specification Version 1.1 and most of Version 2.0.

To use these directives, you must specify compiler option -openmp (Linux and Mac OS X) or /Qopenmp (Windows).

This section discusses data scope attribute clauses, conditional compilation rules, nesting and binding rules, and the following directives:

• ATOMIC directive

  Specifies that a specific memory location is to be updated dynamically.

• BARRIER directive

  Synchronizes all the threads in a team.

• CRITICAL directive

  Restricts access for a block of code to only one thread at a time.

• DO directive

  Specifies that the iterations of the immediately following DO loop must be executed in parallel.

• FLUSH directive

  Specifies synchronization points where the implementation must have a consistent view of memory.

• MASTER directive

  Specifies a block of code to be executed by the master thread of the team.

• ORDERED directive

  Specifies a block of code to be executed sequentially.

• PARALLEL directive

  Defines a parallel region.

• PARALLEL DO directive

  Defines a parallel region that contains a single DO directive.

• PARALLEL SECTIONS directive

  Defines a parallel region that contains SECTIONS directives.

• PARALLEL WORKSHARE directive

  Defines a parallel region that contains a single WORKSHARE directive.

• SECTIONS directive

  Specifies a block of code to be divided among threads in a team (a worksharing area).

• SINGLE directive

  Specifies a block of code to be executed by only one thread in a team.

• TASK directive

  Defines a task region.

• TASKWAIT directive

  Specifies a wait on the completion of child tasks generated since the beginning of the current task.

• THREADPRIVATE directive

  Makes named common blocks private to a thread but global within the thread.

• WORKSHARE directive

  Divides the work of executing a block of statements or constructs into separate units.

The OpenMP parallel directives can be grouped into the categories shown in the following table:

Note that certain general directives and rules can affect DO loops. For more information, see Rules for General Directives that Affect DO Loops.

See Also