l.6 OpenMP Compliance............................... 31 l7 Normative References...·····.················· 31 l.8 Organization of this Document······················· 34 2 Directives 37 2.1 Directive Format.......·....·...····.··.···. 38 2.1.1 Fixed Source Form Directives 41 2.1.2 Free Source Form Directives 41 2.1.3 Stand-Alone Directives... 42 2.l.4 Array Shaping...·········· 3 2.1.5 Array Sections..........。..。.。.........。..。.。 44 2.1.6 47 2.2 Conditional Compilation 49 2.2.1 Fixed Source Form Conditional Compilation Sentinels.. 50 2.2.2 Free Source Form Conditional Compilation Sentinel.···..,,..·,· 50 23 Variant Directives.,......,. 51 2.3.1 51 2.3.2 Context Selectors 53 2.33 Matching and Scoring Context Selectors.········ 55 2.3.4 Metadirectives.............................. 56 2.3.5 declare variant Directive ....................... 58 2.4 requires Directive.,.,...,.,.,.,..,.............,. 60 2.5 Internal Control Variables 63 2.5.1 ICV Descriptions 64 2.5.2 ICV Initialization 66 2.5.3 Modifying and Retrieving ICV Values.................... 68 2.5.4 How ICVs are Scoped........,...........,....,... 70 2.5.4.1 How the Per-Data Environment ICVs Work 72 2.5.5 ICV Override Relationships 72 2.6 parallel Construct.············ 2.6.1 Determining the Number of Threads for a parallel Region........ 中 2.6.2 Controlling OpenMP Thread Affinity.··········· 。。。。。。。 80 2.7 teams Construct 82 OpenMP API-Version 5.0 November 20181.6 OpenMP Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 1.7 Normative References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 1.8 Organization of this Document . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 2 Directives 37 2.1 Directive Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 2.1.1 Fixed Source Form Directives . . . . . . . . . . . . . . . . . . . . . . . . . 41 2.1.2 Free Source Form Directives . . . . . . . . . . . . . . . . . . . . . . . . . 41 2.1.3 Stand-Alone Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 2.1.4 Array Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 2.1.5 Array Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 2.1.6 Iterators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 2.2 Conditional Compilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 2.2.1 Fixed Source Form Conditional Compilation Sentinels . . . . . . . . . . . . 50 2.2.2 Free Source Form Conditional Compilation Sentinel . . . . . . . . . . . . . 50 2.3 Variant Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 2.3.1 OpenMP Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 2.3.2 Context Selectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 2.3.3 Matching and Scoring Context Selectors . . . . . . . . . . . . . . . . . . . 55 2.3.4 Metadirectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 2.3.5 declare variant Directive . . . . . . . . . . . . . . . . . . . . . . . . 58 2.4 requires Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 2.5 Internal Control Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 2.5.1 ICV Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 2.5.2 ICV Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 2.5.3 Modifying and Retrieving ICV Values . . . . . . . . . . . . . . . . . . . . 68 2.5.4 How ICVs are Scoped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 2.5.4.1 How the Per-Data Environment ICVs Work . . . . . . . . . . . . . . . 72 2.5.5 ICV Override Relationships . . . . . . . . . . . . . . . . . . . . . . . . . . 72 2.6 parallel Construct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 2.6.1 Determining the Number of Threads for a parallel Region . . . . . . . . 78 2.6.2 Controlling OpenMP Thread Affinity . . . . . . . . . . . . . . . . . . . . . 80 2.7 teams Construct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 ii OpenMP API – Version 5.0 November 2018