15.2.4 Compaq Fortran Parallel Compiler Directives (TU*X only)

Compaq Fortran supplies parallel directives that you can use for compatibility with older programs that were written for parallel execution.

This section describes the following parallel directives:

• BARRIER (Section 15.2.4.1)

  Synchronizes all the threads in a team.

• CHUNK (Section 15.2.4.2)

  Sets a default chunksize to adjust the number of iterations assigned to a thread.

• COPYIN (Section 15.2.4.3)

  Copies the values of listed data objects from the master thread to PRIVATE data objects of the same name in slave threads.

• CRITICAL SECTION (Section 15.2.4.4)

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

• INSTANCE (Section 15.2.4.5)

  Specifies the availability of named common blocks.

• MP_SCHEDTYPE (Section 15.2.4.6)

  Sets a default run-time scheduling type.

• PARALLEL (Section 15.2.4.7)

  Defines a parallel region.

• PARALLEL DO (Section 15.2.4.8)

  Defines a parallel region that contains a single DO directive.

• PARALLEL SECTIONS (Section 15.2.4.9)

  Defines a parallel region that contains SECTIONS directives.

• PDO (Section 15.2.4.10)

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

• PDONE (Section 15.2.4.11)

  Terminates the current parallel DO loop.

• PSECTIONS (Section 15.2.4.12)

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

• SINGLE PROCESS (Section 15.2.4.13)

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

• TASKCOMMON (Section 15.2.4.14)

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

The Compaq Fortran parallel directives can be grouped into the categories shown in Table 15-4.

Table 15-4 Categories of Compaq Fortran Parallel Directives (TU*X only)

For details on how to use these directives, see your user manual.