Language Reference

+-------------------------------IBM Extension--------------------------------+

Chapter 11. Directives

This chapter provides an alphabetical reference to the compiler directives and includes background information on the following:

• The XLF directives used for SMP programming. To ensure that your compiler will recognize these directives, compile your code using either the xlf_r, xlf_r7, xlf90_r, xlf90_r7, xlf95_r, or xlf95_r7 invocation commands, and specify the -qsmp compiler option. Note that the compiler recognizes some of the directives if you specify either the -qsmp or -qhot compiler option.
• The XLF directives used to specify threadsafe code. To ensure that this functionality will be recognized by the compiler, compile your code using either the xlf_r, xlf_r7, xlf90_r, xlf90_r7, xlf95_r or xlf95_r7 invocation commands.
• All comment form and noncomment form XLF directives from XL Fortran Version 8.1.
• Detailed descriptions of all data scope attribute clauses.

This chapter describes:

• SMP and Threadsafing Directives
• Noncomment and Comment Form Directives
• Data Scope Attribute Clauses
• ASSERT
• ATOMIC
• BARRIER
• CACHE_ZERO
• CNCALL
• COLLAPSE
• CRITICAL / END CRITICAL
• DO / END DO
• DO SERIAL
• EJECT
• FLUSH
• INCLUDE
• INDEPENDENT
• ISYNC
• LIGHT_SYNC
• #line
• MASTER / END MASTER
• ORDERED / END ORDERED
• PARALLEL / END PARALLEL
• PARALLEL DO / END PARALLEL DO
• PARALLEL WORKSHARE / END PARALLEL WORKSHARE
• PERMUTATION
• PREFETCH
• @PROCESS
• SCHEDULE
• SECTIONS / END SECTIONS
• SINGLE / END SINGLE
• SNAPSHOT
• SOURCEFORM
• SUBSCRIPTORDER
• THREADLOCAL
• THREADPRIVATE
• UNROLL