OpenMP 6.0 Directives and Clauses

This comprehensive reference catalogue documents all OpenMP 6.0 keywords from the OpenMP Application Programming Interface Version 6.0 specification.

Purpose

This document serves as a complete keyword inventory for development and reference. Each entry includes:

Specification section and page numbers
Categorization and properties
No duplication - each keyword appears once

Coverage

66 Directives/Constructs - All executable, declarative, and meta directives
125 Clauses - All clause keywords
Modifiers - Map-type, dependence-type, schedule, and other modifiers
Keywords & Values - Memory orders, atomic operations, schedule types, allocators, and more
Reduction Operators - All supported reduction operations
Special Identifiers - Reserved locators, device identifiers, and constants

Directives and Constructs

allocate (Section 8.5; pp. 341–342; category: declarative; association: explicit; properties: pure)
allocators (Section 8.7; category: executable; association: block : allocator; properties: default)
assume (Section 10.6.3; category: informational; association: block; properties: pure)
assumes (Section 10.6.2; p. 399; category: informational; association: unassociated; properties: pure)
atomic (Section 17.8.5; pp. 525–528; category: executable; association: block : atomic; properties: mutual-exclusion, order-concurrent-nestable, simdizable)
barrier (Section 17.3.1; pp. 506–508; category: executable; association: unassociated; properties: team-executed)
begin assumes (Section 10.6.4; p. 399; category: informational; association: delimited; properties: default)
begin declare_target (Section 9.9.2; p. 380; category: declarative; association: delimited; properties: declare-target, device, variant-generating)
begin declare_variant (Section 9.6.5; p. 367; category: declarative; association: delimited; properties: default)
cancel (Section 18.2; pp. 551–554; category: executable; association: unassociated; properties: default)
cancellation_point (Section 18.3; pp. 555–556; category: executable; association: unassociated; properties: default)
critical (Section 17.2; pp. 504–505; category: executable; association: block; properties: mutual-exclusion, thread-limiting, thread-exclusive)
declare_induction (Section 7.6.17; pp. 294–295; category: declarative; association: unassociated; properties: pure)
declare_mapper (Section 7.9.10; pp. 324–327; category: declarative; association: unassociated; properties: pure)
declare_reduction (Section 7.6.14; pp. 291–292; category: declarative; association: unassociated; properties: pure)
declare_simd (Section 9.8; pp. 372–373; category: declarative; association: declaration; properties: pure, variant-generating)
declare_target (Section 9.9.1; pp. 377–379; category: declarative; association: explicit; properties: declare-target, device, pure, variant-generating)
declare_variant (Section 9.6.4; pp. 365–366; category: declarative; association: declaration; properties: pure)
depobj (Section 17.9.3; p. 536; category: executable; association: unassociated; properties: default)
dispatch (Section 9.7; pp. 368–369; category: executable; association: block : function-dispatch; properties: context-matching)
distribute (Section 13.7; pp. 451–452; category: executable; association: loop nest; properties: SIMD-partitionable, teams-nestable, work-distribution, partitioned)
do (Section 13.6.2; p. 448; category: executable; association: loop nest; properties: work-distribution, team-executed, partitioned, SIMD-partitionable, worksharing, worksharing-loop, cancellable, context-matching)
error (Section 10.1; p. 383; category: utility; association: unassociated; properties: pure)
flush (Section 17.8.6; pp. 529–535; category: executable; association: unassociated; properties: default)
for (Section 13.6.1; p. 447; category: executable; association: loop nest; properties: work-distribution, team-executed, partitioned, SIMD-partitionable, worksharing, worksharing-loop, cancellable, context-matching)
fuse (Section 11.3; p. 405; category: executable; association: loop sequence; properties: loop-transforming, order-concurrent-nestable, pure, simdizable, teams-nestable)
groupprivate (Section 7.13; pp. 332–333; category: declarative; association: explicit; properties: pure)
interchange (Section 11.4; p. 406; category: executable; association: loop nest; properties: loop-transforming, nonrectangular-compatible, order-concurrent-nestable, pure, simdizable, teams-nestable)
interop (Section 16.1; p. 499; category: executable; association: unassociated; properties: device)
loop (Section 13.8; p. 454; category: executable; association: loop nest; properties: order-concurrent-nestable, partitioned, simdizable, team-executed, teams-nestable, work-distribution, worksharing)
masked (Section 12.5; p. 433; category: executable; association: block; properties: thread-limiting, thread-selecting)
begin metadirective (Section 9.4.4; p. 327; category: meta; association: delimited; properties: pure)
metadirective (Section 9.4.3; p. 327; category: meta; association: unassociated; properties: pure)
nothing (Section 10.7; pp. 400–402; category: utility; association: unassociated; properties: pure, loop-transforming)
ordered (Section 17.10.2; pp. 546–547; category: executable; association: block; properties: mutual-exclusion, simdizable, thread-limiting, thread-exclusive)
parallel (Section 12.1; pp. 415–418; category: executable; association: block; properties: cancellable, context-matching, order-concurrent-nestable, parallelism-generating, team-generating, teams-nestable, thread-limiting)
requires (Section 10.5; p. 386; category: informational; association: unassociated; properties: default)
reverse (Section 11.5; p. 407; category: executable; association: loop nest; properties: generally-composable, loop-transforming, order-concurrent-nestable, pure, simdizable, teams-nestable)
scan (Section 7.7; pp. 297–299; category: subsidiary; association: separating; properties: pure)
scope (Section 13.2; p. 437; category: executable; association: block; properties: work-distribution, team-executed, worksharing, thread-limiting)
section (Section 13.3.1; p. 439; category: subsidiary; association: separating; properties: default)
sections (Section 13.3; p. 438; category: executable; association: block; properties: work-distribution, team-executed, partitioned, worksharing, thread-limiting, cancellable)
simd (Section 12.4; p. 430; category: executable; association: loop nest; properties: context-matching, order-concurrent-nestable, parallelism-generating, pure, simdizable)
single (Section 13.1; p. 436; category: executable; association: block; properties: work-distribution, team-executed, partitioned, worksharing, thread-limiting, thread-selecting)
split (Section 11.6; p. 408; category: executable; association: loop nest; properties: generally-composable, loop-transforming, order-concurrent-nestable, pure, simdizable, teams-nestable)
stripe (Section 11.7; p. 410; category: executable; association: loop nest; properties: loop-transforming, order-concurrent-nestable, pure, simdizable, teams-nestable)
target (Section 15.8; pp. 491–495; category: executable; association: block; properties: parallelism-generating, team-generating, thread-limiting, exception-aborting, task-generating, device, device-affecting, data-mapping, map-entering, map-exiting, context-matching)
target_data (Section 15.7; pp. 489–490; category: executable; association: block; properties: device, device-affecting, data-mapping, map-entering, map-exiting, parallelism-generating, sharing-task, task-generating)
target_enter_data (Section 15.5; pp. 485–486; category: executable; association: unassociated; properties: parallelism-generating, task-generating, device, device-affecting, data-mapping, map-entering)
target_exit_data (Section 15.6; pp. 487–488; category: executable; association: unassociated; properties: parallelism-generating, task-generating, device, device-affecting, data-mapping, map-exiting)
target_update (Section 15.9; pp. 496–498; category: executable; association: unassociated; properties: parallelism-generating, task-generating, device, device-affecting)
task (Section 14.1; pp. 457–459; category: executable; association: block; properties: parallelism-generating, thread-limiting, task-generating)
task_iteration (Section 14.2.3; p. 465; category: subsidiary; association: unassociated; properties: default)
taskgraph (Section 14.3; pp. 466–468; category: executable; association: block; properties: default)
taskgroup (Section 17.4; p. 509; category: executable; association: block; properties: cancellable)
taskloop (Section 14.2; pp. 460–462; category: executable; association: loop nest; properties: parallelism-generating, SIMD-partitionable, task-generating)
taskwait (Section 17.5; pp. 510–511; category: executable; association: unassociated; properties: default)
taskyield (Section 14.12; pp. 477–480; category: executable; association: unassociated; properties: default)
teams (Section 12.2; pp. 425–427; category: executable; association: block; properties: parallelism-generating, team-generating, thread-limiting, context-matching)
threadprivate (Section 7.3; pp. 246–253; category: declarative; association: explicit; properties: pure)
tile (Section 11.8; p. 411; category: executable; association: loop nest; properties: loop-transforming, order-concurrent-nestable, pure, simdizable, teams-nestable)
unroll (Section 11.9; p. 412; category: executable; association: loop nest; properties: generally-composable, loop-transforming, order-concurrent-nestable, pure, simdizable, teams-nestable)
workdistribute (Section 13.5; pp. 443–446; category: executable; association: block; properties: work-distribution, partitioned)
workshare (Section 13.4; pp. 440–442; category: executable; association: block; properties: work-distribution, team-executed, partitioned, worksharing)

Clauses

absent (Section 10.6.1.1; p. 394)
acq_rel (Section 17.8.1.1; p. 515)
acquire (Section 17.8.1.2; p. 516)
adjust_args (Section 9.6.2; pp. 362–363)
affinity (Section 14.10; p. 475)
align (Section 8.3; p. 340)
aligned (Section 7.12; p. 331)
allocate (Section 8.6; pp. 343–345)
allocator (Section 8.4; p. 340)
append_args (Section 9.6.3; p. 364)
apply (Section 11.1; pp. 403–404)
at (Section 10.2; p. 383)
atomic_default_mem_order (Section 10.5.1.1; p. 387)
bind (Section 13.8.1; pp. 455–456)
capture (Section 17.8.3.1; p. 521)
collapse (Section 6.4.5; p. 236)
collector (Section 7.6.19; p. 296)
combiner (Section 7.6.15; p. 292)
compare (Section 17.8.3.2; p. 522)
contains (Section 10.6.1.2; p. 394)
copyin (Section 7.8.1; p. 302)
copyprivate (Section 7.8.2; pp. 303–309)
counts (Section 11.6.1; p. 409)
default (Section 7.5.1; p. 254)
defaultmap (Section 7.9.9; pp. 322–323)
depend (Section 17.9.5; pp. 538–540)
destroy (Section 5.7; pp. 213–235)
detach (Section 14.11; p. 476)
device (Section 15.2; p. 482)
device_safesync (Section 10.5.1.7; p. 393; properties: required, unique Members:)
device_type (Section 15.1; p. 481)
dist_schedule (Section 13.7.1; p. 453)
doacross (Section 17.9.7; pp. 542–544)
dynamic_allocators (Section 10.5.1.2; p. 388)
enter (Section 7.9.7; p. 320)
exclusive (Section 7.7.2; p. 300)
fail (Section 17.8.3.3; p. 522)
filter (Section 12.5.1; pp. 434–435)
final (Section 14.7; p. 472)
firstprivate (Section 7.5.4; pp. 258–259)
from (Section 7.10.2; p. 329)
full (Section 11.9.1; p. 413)
grainsize (Section 14.2.1; p. 463)
graph_id (Section 14.3.1; p. 468)
graph_reset (Section 14.3.2; p. 469)
has_device_addr (Section 7.5.9; p. 268)
hint (Section 17.1; p. 503)
holds (Section 10.6.1.3; p. 395)
if (Section 5.5; p. 210)
in_reduction (Section 7.6.12; p. 287)
inbranch (Section 9.8.1.1; p. 374)
inclusive (Section 7.7.1; p. 299)
indirect (Section 9.9.3; pp. 381–382)
induction (Section 7.6.13; pp. 288–290)
inductor (Section 7.6.18; p. 296)
init (Section 5.6; pp. 211–212)
init_complete (Section 7.7.3; p. 301)
initializer (Section 7.6.16; p. 293)
interop (Section 9.7.1; p. 370)
is_device_ptr (Section 7.5.7; p. 266)
lastprivate (Section 7.5.5; pp. 260–262)
linear (Section 7.5.6; pp. 263–265)
link (Section 7.9.8; p. 321)
local (Section 7.14; pp. 334–339)
looprange (Section 6.4.7; pp. 238–245)
map (Section 7.9.6; pp. 310–319)
match (Section 9.6.1; p. 361)
memscope (Section 17.8.4; p. 524)
mergeable (Section 14.5; p. 470)
message (Section 10.3; p. 384)
no_openmp (Section 10.6.1.4; p. 396)
no_openmp_constructs (Section 10.6.1.5; p. 396)
no_openmp_routines (Section 10.6.1.6; p. 397)
no_parallelism (Section 10.6.1.7; p. 398)
nocontext (Section 9.7.3; p. 371)
nogroup (Section 17.7; p. 514; properties: exclusive, unique Members:)
nontemporal (Section 12.4.1; p. 431)
notinbranch (Section 9.8.1.2; pp. 375–376)
novariants (Section 9.7.2; p. 370)
nowait (Section 17.6; pp. 512–513)
num_tasks (Section 14.2.2; p. 464)
num_teams (Section 12.2.1; p. 427)
num_threads (Section 12.1.2; pp. 419–422)
order (Section 12.3; pp. 428–429)
ordered (Section 6.4.6; p. 237)
otherwise (Section 9.4.2; pp. 357–360; properties: pure)
partial (Section 11.9.2; p. 414)
permutation (Section 11.4.1; p. 407)
priority (Section 14.9; p. 474)
private (Section 7.5.3; pp. 256–257)
proc_bind (Section 12.1.4; p. 423)
read (Section 17.8.2.1; p. 519)
reduction (Section 7.6.10; pp. 283–285)
relaxed (Section 17.8.1.3; p. 516)
release (Section 17.8.1.4; p. 517)
replayable (Section 14.6; p. 471)
reverse_offload (Section 10.5.1.3; p. 389)
safelen (Section 12.4.2; p. 431)
safesync (Section 12.1.5; p. 424)
schedule (Section 13.6.3; pp. 449–450)
self_maps (Section 10.5.1.6; p. 392)
seq_cst (Section 17.8.1.5; p. 518; properties: exclusive, unique Members:)
severity (Section 10.4; p. 385)
shared (Section 7.5.2; p. 255)
simd (Section 17.10.3.2; pp. 549–550; properties: exclusive, required, unique Members:)
simdlen (Section 12.4.3; p. 432)
sizes (Section 11.2; p. 404)
task_reduction (Section 7.6.11; p. 286)
thread_limit (Section 15.3; pp. 483–484)
threads (Section 17.10.3.1; p. 548)
threadset (Section 14.8; p. 473)
to (Section 7.10.1; p. 328)
transparent (Section 17.9.6; p. 541)
unified_address (Section 10.5.1.4; p. 390)
unified_shared_memory (Section 10.5.1.5; p. 391)
uniform (Section 7.11; p. 330)
untied (Section 14.4; p. 470)
update (Section 17.9.4; p. 537)
use (Section 16.1.2; pp. 500–502)
use_device_addr (Section 7.5.10; pp. 269–282)
use_device_ptr (Section 7.5.8; p. 267)
uses_allocators (Section 8.8; pp. 346–355)
weak (Section 17.8.3.4; p. 523)
when (Section 9.4.1; p. 356)
write (Section 17.8.2.3; p. 520; properties: unique Members:)

Modifiers

Modifiers are keywords that modify the behavior of clauses. They appear as part of clause syntax to refine clause semantics.

Map-Type Modifiers

storage (Section 7.9.1; p. 305; map-type modifier; default value)
to (Section 7.9.1; p. 305; map-type modifier; map-entering, assigning)
from (Section 7.9.1; p. 305; map-type modifier; map-exiting, assigning)
tofrom (Section 7.9.1; p. 305; map-type modifier; map-entering, map-exiting, assigning)
alloc (Section 7.9.1; p. 305; map-type modifier; alias for storage on map-entering constructs)
release (Section 7.9.1; p. 305; map-type modifier; alias for storage on map-exiting constructs)
delete (Section 7.9.1; p. 305; map-type modifier; used with delete-modifier)

Task-Dependence-Type Modifiers

in (Section 17.9.1; p. 535; task-dependence-type modifier; input dependence)
out (Section 17.9.1; p. 535; task-dependence-type modifier; output dependence)
inout (Section 17.9.1; p. 535; task-dependence-type modifier; input-output dependence)
inoutset (Section 17.9.1; p. 535; task-dependence-type modifier; inout with set semantics)
mutexinoutset (Section 17.9.1; p. 535; task-dependence-type modifier; mutual exclusion inout)
depobj (Section 17.9.1; p. 535; task-dependence-type modifier; depend object)

Schedule Modifiers

monotonic (Section 13.6.3; p. 449; ordering-modifier for schedule clause)
nonmonotonic (Section 13.6.3; p. 449; ordering-modifier for schedule clause)
simd (Section 13.6.3; p. 449; chunk-modifier for schedule clause)

Reduction and Induction Modifiers

reduction-identifier (Section 7.6.9; p. 282; modifier specifying reduction operation)
iterator (Section 5.2.6; p. 200; modifier for creating iterator expressions)

Other Clause Modifiers

ref (Section 7.9.5; ref-modifier for map clause; indicates referencing variable)
mapper (Section 7.9.4; mapper-modifier for map clause; specifies custom mapper)
allocator-simple-modifier (Section 8.6; allocator modifier; simple allocator specification)
allocator-complex-modifier (Section 8.6; allocator modifier; complex allocator specification)
prefer-type (Section 16.1.3; p. 501; prefer-type modifier for interop clause)
directive-name-modifier (Section 5.4; p. 204; conditional modifier using directive name)

Map Clause Modifiers

always (Section 7.9.6; always-modifier; forces data transfer)
close (Section 7.9.6; close-modifier; allocates in fastest memory)
present (Section 7.9.6; present-modifier; data must be present)
self (Section 7.9.6; self-modifier; for device-host data mapping)

Lastprivate Modifiers

conditional (Section 7.5.5; p. 261; modifier for lastprivate clause; conditional assignment)

original (Section 7.6.10; original-sharing-modifier; preserves original data-sharing)

Keywords and Values

Keywords and values used as arguments to clauses and directives.

Memory Order Keywords

seq_cst (Section 17.8.1.5; p. 518; sequentially consistent memory ordering)
acq_rel (Section 17.8.1.1; p. 515; acquire-release memory ordering)
acquire (Section 17.8.1.2; p. 516; acquire memory ordering)
release (Section 17.8.1.4; p. 517; release memory ordering)
relaxed (Section 17.8.1.3; p. 516; relaxed memory ordering)

Atomic Operation Keywords

read (Section 17.8.2.1; p. 519; atomic read operation)
write (Section 17.8.2.3; p. 520; atomic write operation)
update (Section 17.8.2.2; atomic update operation)
capture (Section 17.8.3.1; p. 521; atomic capture operation)
compare (Section 17.8.3.2; p. 522; atomic compare operation)
weak (Section 17.8.3.4; p. 523; weak compare semantics)
fail (Section 17.8.3.3; fail memory order for atomic compare)

Schedule Types

static (Section 13.6.3; p. 449; static loop schedule)
dynamic (Section 13.6.3; p. 449; dynamic loop schedule)
guided (Section 13.6.3; p. 449; guided loop schedule)
auto (Section 13.6.3; p. 449; implementation-defined loop schedule)
runtime (Section 13.6.3; p. 449; runtime-determined loop schedule)

Proc_bind Values

primary (Section 12.1.4; p. 423; bind to primary thread's place)
close (Section 12.1.4; p. 423; bind close to parent thread)
spread (Section 12.1.4; p. 423; spread across places)
master (deprecated; use primary instead)

Order Values

concurrent (Section 12.3; p. 428; concurrent execution ordering)
reproducible (Section 12.3; p. 428; reproducible ordering)
unconstrained (Section 12.3; p. 428; unconstrained ordering)

Device-Type Values

host (Section 15.1; p. 481; host device type)
nohost (Section 15.1; p. 481; non-host device type)
any (Section 15.1; p. 481; any device type)

Bind Values

thread (Section 13.8.1; p. 455; bind to thread)
parallel (Section 13.8.1; p. 455; bind to parallel region)
teams (Section 13.8.1; p. 455; bind to teams region)

Default Values

shared (Section 7.5.1; p. 254; default shared data-sharing)
private (Section 7.5.1; p. 254; default private data-sharing)
firstprivate (Section 7.5.1; p. 254; default firstprivate data-sharing)
none (Section 7.5.1; p. 254; no default data-sharing)

Error Directive Values

compilation (Section 10.2; at clause value; error at compilation time)
execution (Section 10.2; at clause value; error at execution time)
fatal (Section 10.4; p. 385; severity clause value; fatal error)
warning (Section 10.4; p. 385; severity clause value; warning)

Defaultmap Values

alloc (Section 7.9.9; p. 322; defaultmap behavior)
to (Section 7.9.9; p. 322; defaultmap behavior)
from (Section 7.9.9; p. 322; defaultmap behavior)
tofrom (Section 7.9.9; p. 322; defaultmap behavior)
firstprivate (Section 7.9.9; p. 322; defaultmap behavior)
none (Section 7.9.9; p. 322; defaultmap behavior)
default (Section 7.9.9; p. 322; defaultmap behavior)
present (Section 7.9.9; p. 322; defaultmap behavior)

Variable Categories (for defaultmap)

scalar (Section 7.9.9; p. 322; scalar variable category)
aggregate (Section 7.9.9; p. 322; aggregate variable category)
allocatable (Section 7.9.9; p. 322; allocatable variable category)
pointer (Section 7.9.9; p. 322; pointer variable category)

Predefined Allocators

OpenMP defines several predefined memory allocators for different memory spaces.

Standard Allocators

omp_default_mem_alloc (Section 8.2; p. 336; default memory allocator)
omp_large_cap_mem_alloc (Section 8.2; p. 336; large capacity memory allocator)
omp_const_mem_alloc (Section 8.2; p. 336; constant memory allocator)
omp_high_bw_mem_alloc (Section 8.2; p. 336; high bandwidth memory allocator)
omp_low_lat_mem_alloc (Section 8.2; p. 336; low latency memory allocator)
omp_cgroup_mem_alloc (Section 8.2; p. 336; contention group memory allocator)
omp_pteam_mem_alloc (Section 8.2; p. 336; parallel team memory allocator)
omp_thread_mem_alloc (Section 8.2; p. 336; thread-private memory allocator)

Special Allocator Values

omp_null_allocator (Section 8.2; p. 336; null allocator value)

Allocator Traits

sync_hint (Section 8.2; p. 336; allocator trait; contended, uncontended, serialized, private)
alignment (Section 8.2; p. 336; allocator trait; byte alignment)
access (Section 8.2; p. 336; allocator trait; all, memspace, device, cgroup, pteam, thread)
pool_size (Section 8.2; p. 336; allocator trait; pool size limit)
fallback (Section 8.2; p. 336; allocator trait; default_mem_fb, null_fb, abort_fb, allocator_fb)
fb_data (Section 8.2; p. 336; allocator trait; fallback allocator handle)
pinned (Section 8.2; p. 336; allocator trait; true, false)
partition (Section 8.2; p. 336; allocator trait; environment, nearest, blocked, interleaved, partitioner)