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libgomp.h
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/* Copyright (C) 2005-2025 Free Software Foundation, Inc.
Contributed by Richard Henderson <[email protected]>.
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* This file contains data types and function declarations that are not
part of the official OpenACC or OpenMP user interfaces. There are
declarations in here that are part of the GNU Offloading and Multi
Processing ABI, in that the compiler is required to know about them
and use them.
The convention is that the all caps prefix "GOMP" is used group items
that are part of the external ABI, and the lower case prefix "gomp"
is used group items that are completely private to the library. */
#ifndef LIBGOMP_H
#define LIBGOMP_H 1
#ifndef _LIBGOMP_CHECKING_
/* Define to 1 to perform internal sanity checks. */
#define _LIBGOMP_CHECKING_ 0
#endif
#include "config.h"
#include <stdint.h>
/* Include omp.h by parts. */
#include "omp-lock.h"
#define _LIBGOMP_OMP_LOCK_DEFINED 1
#include "omp.h.in"
#include "libgomp-plugin.h"
#include "gomp-constants.h"
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
#include <stdbool.h>
#include <stdlib.h>
#include <stdarg.h>
/* Needed for memset in priority_queue.c. */
#if _LIBGOMP_CHECKING_
# ifdef STRING_WITH_STRINGS
# include <string.h>
# include <strings.h>
# else
# ifdef HAVE_STRING_H
# include <string.h>
# else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
# endif
# endif
#endif
#ifdef HAVE_ATTRIBUTE_VISIBILITY
# pragma GCC visibility push(hidden)
#endif
/* If we were a C++ library, we'd get this from <std/atomic>. */
enum memmodel
{
MEMMODEL_RELAXED = 0,
MEMMODEL_CONSUME = 1,
MEMMODEL_ACQUIRE = 2,
MEMMODEL_RELEASE = 3,
MEMMODEL_ACQ_REL = 4,
MEMMODEL_SEQ_CST = 5
};
/* alloc.c */
#if defined(HAVE_ALIGNED_ALLOC) \
|| defined(HAVE_POSIX_MEMALIGN) \
|| defined(HAVE_MEMALIGN)
/* Defined if gomp_aligned_alloc doesn't use fallback version
and free can be used instead of gomp_aligned_free. */
#define GOMP_HAVE_EFFICIENT_ALIGNED_ALLOC 1
#endif
#if defined(GOMP_HAVE_EFFICIENT_ALIGNED_ALLOC) && !defined(__AMDGCN__)
#define GOMP_USE_ALIGNED_WORK_SHARES 1
#endif
extern void *gomp_malloc (size_t) __attribute__((malloc));
extern void *gomp_malloc_cleared (size_t) __attribute__((malloc));
extern void *gomp_realloc (void *, size_t);
extern void *gomp_aligned_alloc (size_t, size_t)
__attribute__((malloc, alloc_size (2)));
extern void gomp_aligned_free (void *);
/* Avoid conflicting prototypes of alloca() in system headers by using
GCC's builtin alloca(). */
#define gomp_alloca(x) __builtin_alloca(x)
/* Optimized allocators for team-specific data that will die with the team. */
#ifdef __AMDGCN__
#include "libgomp-gcn.h"
/* The arena is initialized in config/gcn/team.c. */
static inline void * __attribute__((malloc))
team_malloc (size_t size)
{
/* 4-byte align the size. */
size = (size + 3) & ~3;
/* Allocate directly from the arena.
The compiler does not support DS atomics, yet. */
void *result;
asm ("ds_add_rtn_u64 %0, %1, %2\n\ts_waitcnt 0"
: "=v"(result) : "v"(TEAM_ARENA_FREE), "v"(size), "e"(1L) : "memory");
/* Handle OOM. */
if (result + size > *(void * __lds *)TEAM_ARENA_END)
{
/* While this is experimental, let's make sure we know when OOM
happens. */
const char msg[] = "GCN team arena exhausted;"
" configure with GCN_TEAM_ARENA_SIZE=bytes\n";
write (2, msg, sizeof(msg)-1);
/* Fall back to using the heap (slowly). */
result = gomp_malloc (size);
}
return result;
}
static inline void * __attribute__((malloc))
team_malloc_cleared (size_t size)
{
char *result = team_malloc (size);
/* Clear the allocated memory. */
__builtin_memset (result, 0, size);
return result;
}
static inline void
team_free (void *ptr)
{
/* The whole arena is freed when the kernel exits.
However, if we fell back to using heap then we should free it.
It would be better if this function could be a no-op, but at least
LDS loads are cheap. */
if (ptr < *(void * __lds *)TEAM_ARENA_START
|| ptr >= *(void * __lds *)TEAM_ARENA_END)
free (ptr);
}
#else
#define team_malloc(...) gomp_malloc (__VA_ARGS__)
#define team_malloc_cleared(...) gomp_malloc_cleared (__VA_ARGS__)
#define team_free(...) free (__VA_ARGS__)
#endif
/* error.c */
extern void gomp_vdebug (int, const char *, va_list);
extern void gomp_debug (int, const char *, ...)
__attribute__ ((format (printf, 2, 3)));
#define gomp_vdebug(KIND, FMT, VALIST) \
do { \
if (__builtin_expect (gomp_debug_var, 0)) \
(gomp_vdebug) ((KIND), (FMT), (VALIST)); \
} while (0)
#define gomp_debug(KIND, ...) \
do { \
if (__builtin_expect (gomp_debug_var, 0)) \
(gomp_debug) ((KIND), __VA_ARGS__); \
} while (0)
extern void gomp_verror (const char *, va_list);
extern void gomp_error (const char *, ...)
__attribute__ ((format (printf, 1, 2)));
extern void gomp_vfatal (const char *, va_list)
__attribute__ ((noreturn));
extern void gomp_fatal (const char *, ...)
__attribute__ ((noreturn, format (printf, 1, 2)));
struct gomp_task;
struct gomp_taskgroup;
struct htab;
#include "priority_queue.h"
#include "sem.h"
#include "mutex.h"
#include "bar.h"
#include "simple-bar.h"
#include "ptrlock.h"
/* This structure contains the data to control one work-sharing construct,
either a LOOP (FOR/DO) or a SECTIONS. */
enum gomp_schedule_type
{
GFS_RUNTIME,
GFS_STATIC,
GFS_DYNAMIC,
GFS_GUIDED,
GFS_AUTO,
GFS_MONOTONIC = 0x80000000U
};
struct gomp_doacross_work_share
{
union {
/* chunk_size copy, as ws->chunk_size is multiplied by incr for
GFS_DYNAMIC. */
long chunk_size;
/* Likewise, but for ull implementation. */
unsigned long long chunk_size_ull;
/* For schedule(static,0) this is the number
of iterations assigned to the last thread, i.e. number of
iterations / number of threads. */
long q;
/* Likewise, but for ull implementation. */
unsigned long long q_ull;
};
/* Size of each array entry (padded to cache line size). */
unsigned long elt_sz;
/* Number of dimensions in sink vectors. */
unsigned int ncounts;
/* True if the iterations can be flattened. */
bool flattened;
/* Actual array (of elt_sz sized units), aligned to cache line size.
This is indexed by team_id for GFS_STATIC and outermost iteration
/ chunk_size for other schedules. */
unsigned char *array;
/* These two are only used for schedule(static,0). */
/* This one is number of iterations % number of threads. */
long t;
union {
/* And this one is cached t * (q + 1). */
long boundary;
/* Likewise, but for the ull implementation. */
unsigned long long boundary_ull;
};
/* Pointer to extra memory if needed for lastprivate(conditional). */
void *extra;
/* Array of shift counts for each dimension if they can be flattened. */
unsigned int shift_counts[];
};
/* Like struct gomp_work_share, but only the 1st cacheline of it plus
flexible array at the end.
Keep in sync with struct gomp_work_share. */
struct gomp_work_share_1st_cacheline
{
enum gomp_schedule_type sched;
int mode;
union {
struct {
long chunk_size, end, incr;
};
struct {
unsigned long long chunk_size_ull, end_ull, incr_ull;
};
};
union {
unsigned *ordered_team_ids;
struct gomp_doacross_work_share *doacross;
};
unsigned ordered_num_used, ordered_owner, ordered_cur;
struct gomp_work_share *next_alloc;
char pad[];
};
struct gomp_work_share
{
/* This member records the SCHEDULE clause to be used for this construct.
The user specification of "runtime" will already have been resolved.
If this is a SECTIONS construct, this value will always be DYNAMIC. */
enum gomp_schedule_type sched;
int mode;
union {
struct {
/* This is the chunk_size argument to the SCHEDULE clause. */
long chunk_size;
/* This is the iteration end point. If this is a SECTIONS construct,
this is the number of contained sections. */
long end;
/* This is the iteration step. If this is a SECTIONS construct, this
is always 1. */
long incr;
};
struct {
/* The same as above, but for the unsigned long long loop variants. */
unsigned long long chunk_size_ull;
unsigned long long end_ull;
unsigned long long incr_ull;
};
};
union {
/* This is a circular queue that details which threads will be allowed
into the ordered region and in which order. When a thread allocates
iterations on which it is going to work, it also registers itself at
the end of the array. When a thread reaches the ordered region, it
checks to see if it is the one at the head of the queue. If not, it
blocks on its RELEASE semaphore. */
unsigned *ordered_team_ids;
/* This is a pointer to DOACROSS work share data. */
struct gomp_doacross_work_share *doacross;
};
/* This is the number of threads that have registered themselves in
the circular queue ordered_team_ids. */
unsigned ordered_num_used;
/* This is the team_id of the currently acknowledged owner of the ordered
section, or -1u if the ordered section has not been acknowledged by
any thread. This is distinguished from the thread that is *allowed*
to take the section next. */
unsigned ordered_owner;
/* This is the index into the circular queue ordered_team_ids of the
current thread that's allowed into the ordered reason. */
unsigned ordered_cur;
/* This is a chain of allocated gomp_work_share blocks, valid only
in the first gomp_work_share struct in the block. */
struct gomp_work_share *next_alloc;
/* The above fields are written once during workshare initialization,
or related to ordered worksharing. Make sure the following fields
are in a different cache line. */
/* This lock protects the update of the following members. */
#ifdef GOMP_USE_ALIGNED_WORK_SHARES
gomp_mutex_t lock __attribute__((aligned (64)));
#else
char pad[64 - offsetof (struct gomp_work_share_1st_cacheline, pad)];
gomp_mutex_t lock;
#endif
/* This is the count of the number of threads that have exited the work
share construct. If the construct was marked nowait, they have moved on
to other work; otherwise they're blocked on a barrier. The last member
of the team to exit the work share construct must deallocate it. */
unsigned threads_completed;
union {
/* This is the next iteration value to be allocated. In the case of
GFS_STATIC loops, this the iteration start point and never changes. */
long next;
/* The same, but with unsigned long long type. */
unsigned long long next_ull;
/* This is the returned data structure for SINGLE COPYPRIVATE. */
void *copyprivate;
};
union {
/* Link to gomp_work_share struct for next work sharing construct
encountered after this one. */
gomp_ptrlock_t next_ws;
/* gomp_work_share structs are chained in the free work share cache
through this. */
struct gomp_work_share *next_free;
};
/* Task reductions for this work-sharing construct. */
uintptr_t *task_reductions;
/* If only few threads are in the team, ordered_team_ids can point
to this array which fills the padding at the end of this struct. */
unsigned inline_ordered_team_ids[0];
};
extern char gomp_workshare_struct_check1
[offsetof (struct gomp_work_share_1st_cacheline, next_alloc)
== offsetof (struct gomp_work_share, next_alloc) ? 1 : -1];
extern char gomp_workshare_struct_check2
[offsetof (struct gomp_work_share, lock) == 64 ? 1 : -1];
/* This structure contains all of the thread-local data associated with
a thread team. This is the data that must be saved when a thread
encounters a nested PARALLEL construct. */
struct gomp_team_state
{
/* This is the team of which the thread is currently a member. */
struct gomp_team *team;
/* This is the work share construct which this thread is currently
processing. Recall that with NOWAIT, not all threads may be
processing the same construct. */
struct gomp_work_share *work_share;
/* This is the previous work share construct or NULL if there wasn't any.
When all threads are done with the current work sharing construct,
the previous one can be freed. The current one can't, as its
next_ws field is used. */
struct gomp_work_share *last_work_share;
/* This is the ID of this thread within the team. This value is
guaranteed to be between 0 and N-1, where N is the number of
threads in the team. */
unsigned team_id;
/* Nesting level. */
unsigned level;
/* Active nesting level. Only active parallel regions are counted. */
unsigned active_level;
/* Place-partition-var, offset and length into gomp_places_list array. */
unsigned place_partition_off;
unsigned place_partition_len;
/* Def-allocator-var ICV. */
uintptr_t def_allocator;
#ifdef HAVE_SYNC_BUILTINS
/* Number of single stmts encountered. */
unsigned long single_count;
#endif
/* For GFS_RUNTIME loops that resolved to GFS_STATIC, this is the
trip number through the loop. So first time a particular loop
is encountered this number is 0, the second time through the loop
is 1, etc. This is unused when the compiler knows in advance that
the loop is statically scheduled. */
unsigned long static_trip;
};
struct target_mem_desc;
enum gomp_icvs
{
GOMP_ICV_NTEAMS = 1,
GOMP_ICV_SCHEDULE = 2,
GOMP_ICV_SCHEDULE_CHUNK_SIZE = 3,
GOMP_ICV_DYNAMIC = 4,
GOMP_ICV_TEAMS_THREAD_LIMIT = 5,
GOMP_ICV_THREAD_LIMIT = 6,
GOMP_ICV_NTHREADS = 7,
GOMP_ICV_NTHREADS_LIST = 8,
GOMP_ICV_NTHREADS_LIST_LEN = 9,
GOMP_ICV_BIND = 10,
GOMP_ICV_BIND_LIST = 11,
GOMP_ICV_BIND_LIST_LEN = 12,
GOMP_ICV_MAX_ACTIVE_LEVELS = 13,
GOMP_ICV_WAIT_POLICY = 14,
GOMP_ICV_STACKSIZE = 15,
GOMP_ICV_DEFAULT_DEVICE = 16,
GOMP_ICV_CANCELLATION = 17,
GOMP_ICV_DISPLAY_AFFINITY = 18,
GOMP_ICV_TARGET_OFFLOAD = 19,
GOMP_ICV_MAX_TASK_PRIORITY = 20,
GOMP_ICV_ALLOCATOR = 21
};
enum gomp_device_num
{
GOMP_DEVICE_NUM_FOR_DEV = -1,
GOMP_DEVICE_NUM_FOR_ALL = -2,
GOMP_DEVICE_NUM_FOR_NO_SUFFIX = -3
};
/* These are the OpenMP 4.0 Internal Control Variables described in
section 2.3.1. Those described as having one copy per task are
stored within the structure; those described as having one copy
for the whole program are (naturally) global variables. */
struct gomp_task_icv
{
unsigned long nthreads_var;
enum gomp_schedule_type run_sched_var;
int run_sched_chunk_size;
int default_device_var;
unsigned int thread_limit_var;
bool dyn_var;
unsigned char max_active_levels_var;
char bind_var;
/* Internal ICV. */
struct target_mem_desc *target_data;
};
enum gomp_env_suffix
{
GOMP_ENV_SUFFIX_UNKNOWN = 0,
GOMP_ENV_SUFFIX_NONE = 1,
GOMP_ENV_SUFFIX_DEV = 2,
GOMP_ENV_SUFFIX_ALL = 4,
GOMP_ENV_SUFFIX_DEV_X = 8
};
/* Struct that contains all ICVs for which we need to store initial values.
Keeping the initial values is needed for omp_display_env. Moreover initial
_DEV and _ALL variants of environment variables are also used to determine
actually used values for devices and for the host. */
struct gomp_initial_icvs
{
unsigned long *nthreads_var_list;
char *bind_var_list;
unsigned long nthreads_var;
unsigned long nthreads_var_list_len;
unsigned long bind_var_list_len;
unsigned long stacksize;
int run_sched_chunk_size;
int default_device_var;
int nteams_var;
int teams_thread_limit_var;
int wait_policy;
unsigned int thread_limit_var;
enum gomp_schedule_type run_sched_var;
bool dyn_var;
unsigned char max_active_levels_var;
char bind_var;
};
struct gomp_default_icv
{
unsigned long nthreads_var;
enum gomp_schedule_type run_sched_var;
int run_sched_chunk_size;
int default_device_var;
unsigned int thread_limit_var;
int nteams_var;
int teams_thread_limit_var;
bool dyn_var;
unsigned char max_active_levels_var;
char bind_var;
};
/* DEVICE_NUM "-1" is reserved for "_DEV" icvs.
DEVICE_NUM "-2" is reserved for "_ALL" icvs.
DEVICE_NUM "-3" is reserved for ICVs without suffix.
Non-negative DEVICE_NUM is for "_DEV_X" icvs. */
struct gomp_icv_list
{
int device_num;
uint32_t flags;
struct gomp_initial_icvs icvs;
struct gomp_icv_list *next;
};
struct gomp_offload_icvs
{
int device_num;
int default_device;
int nteams;
int teams_thread_limit;
};
struct gomp_offload_icv_list
{
int device_num;
struct gomp_offload_icvs icvs;
struct gomp_offload_icv_list *next;
};
enum gomp_target_offload_t
{
GOMP_TARGET_OFFLOAD_DEFAULT,
GOMP_TARGET_OFFLOAD_MANDATORY,
GOMP_TARGET_OFFLOAD_DISABLED
};
#define gomp_supported_active_levels UCHAR_MAX
extern struct gomp_task_icv gomp_global_icv;
#ifndef HAVE_SYNC_BUILTINS
extern gomp_mutex_t gomp_managed_threads_lock;
#endif
extern bool gomp_cancel_var;
extern enum gomp_target_offload_t gomp_target_offload_var;
extern int gomp_max_task_priority_var;
extern unsigned long long gomp_spin_count_var, gomp_throttled_spin_count_var;
extern unsigned long gomp_available_cpus, gomp_managed_threads;
extern unsigned long *gomp_nthreads_var_list, gomp_nthreads_var_list_len;
extern char *gomp_bind_var_list;
extern unsigned long gomp_bind_var_list_len;
extern void **gomp_places_list;
extern unsigned long gomp_places_list_len;
extern unsigned int gomp_num_teams_var;
extern int gomp_nteams_var;
extern int gomp_teams_thread_limit_var;
extern int gomp_debug_var;
extern bool gomp_display_affinity_var;
extern char *gomp_affinity_format_var;
extern size_t gomp_affinity_format_len;
extern uintptr_t gomp_def_allocator;
extern const struct gomp_default_icv gomp_default_icv_values;
extern struct gomp_icv_list *gomp_initial_icv_list;
extern struct gomp_offload_icv_list *gomp_offload_icv_list;
extern int goacc_device_num;
extern char *goacc_device_type;
extern int goacc_default_dims[GOMP_DIM_MAX];
enum gomp_task_kind
{
/* Implicit task. */
GOMP_TASK_IMPLICIT,
/* Undeferred task. */
GOMP_TASK_UNDEFERRED,
/* Task created by GOMP_task and waiting to be run. */
GOMP_TASK_WAITING,
/* Task currently executing or scheduled and about to execute. */
GOMP_TASK_TIED,
/* Used for target tasks that have vars mapped and async run started,
but not yet completed. Once that completes, they will be readded
into the queues as GOMP_TASK_WAITING in order to perform the var
unmapping. */
GOMP_TASK_ASYNC_RUNNING,
/* Task that has finished executing but is waiting for its
completion event to be fulfilled. */
GOMP_TASK_DETACHED
};
struct gomp_task_depend_entry
{
/* Address of dependency. */
void *addr;
struct gomp_task_depend_entry *next;
struct gomp_task_depend_entry *prev;
/* Task that provides the dependency in ADDR. */
struct gomp_task *task;
/* Depend entry is of type "IN" (1) or "INOUTSET" (2). */
unsigned char is_in;
bool redundant;
bool redundant_out;
};
struct gomp_dependers_vec
{
size_t n_elem;
size_t allocated;
struct gomp_task *elem[];
};
/* Used when in GOMP_taskwait or in gomp_task_maybe_wait_for_dependencies. */
struct gomp_taskwait
{
bool in_taskwait;
bool in_depend_wait;
/* Number of tasks we are waiting for. */
size_t n_depend;
gomp_sem_t taskwait_sem;
};
/* This structure describes a "task" to be run by a thread. */
struct gomp_task
{
/* Parent of this task. */
struct gomp_task *parent;
/* Children of this task. */
struct priority_queue children_queue;
/* Taskgroup this task belongs in. */
struct gomp_taskgroup *taskgroup;
/* Tasks that depend on this task. */
struct gomp_dependers_vec *dependers;
struct htab *depend_hash;
struct gomp_taskwait *taskwait;
/* Last depend({,in}out:omp_all_memory) child if any. */
struct gomp_task *depend_all_memory;
/* Number of items in DEPEND. */
size_t depend_count;
/* Number of tasks this task depends on. Once this counter reaches
0, we have no unsatisfied dependencies, and this task can be put
into the various queues to be scheduled. */
size_t num_dependees;
union {
/* Valid only if deferred_p is false. */
gomp_sem_t *completion_sem;
/* Valid only if deferred_p is true. Set to the team that executes the
task if the task is detached and the completion event has yet to be
fulfilled. */
struct gomp_team *detach_team;
};
bool deferred_p;
/* Priority of this task. */
int priority;
/* The priority node for this task in each of the different queues.
We put this here to avoid allocating space for each priority
node. Then we play offsetof() games to convert between pnode[]
entries and the gomp_task in which they reside. */
struct priority_node pnode[3];
struct gomp_task_icv icv;
void (*fn) (void *);
void *fn_data;
enum gomp_task_kind kind;
bool in_tied_task;
bool final_task;
bool copy_ctors_done;
/* Set for undeferred tasks with unsatisfied dependencies which
block further execution of their parent until the dependencies
are satisfied. */
bool parent_depends_on;
/* Dependencies provided and/or needed for this task. DEPEND_COUNT
is the number of items available. */
struct gomp_task_depend_entry depend[];
};
/* This structure describes a single #pragma omp taskgroup. */
struct gomp_taskgroup
{
struct gomp_taskgroup *prev;
/* Queue of tasks that belong in this taskgroup. */
struct priority_queue taskgroup_queue;
uintptr_t *reductions;
bool in_taskgroup_wait;
bool cancelled;
bool workshare;
gomp_sem_t taskgroup_sem;
size_t num_children;
};
/* Various state of OpenMP async offloading tasks. */
enum gomp_target_task_state
{
GOMP_TARGET_TASK_DATA,
GOMP_TARGET_TASK_BEFORE_MAP,
GOMP_TARGET_TASK_FALLBACK,
GOMP_TARGET_TASK_READY_TO_RUN,
GOMP_TARGET_TASK_RUNNING,
GOMP_TARGET_TASK_FINISHED
};
/* This structure describes a target task. */
struct gomp_target_task
{
struct gomp_device_descr *devicep;
void (*fn) (void *);
size_t mapnum;
size_t *sizes;
unsigned short *kinds;
unsigned int flags;
enum gomp_target_task_state state;
struct target_mem_desc *tgt;
struct gomp_task *task;
struct gomp_team *team;
/* Device-specific target arguments. */
void **args;
void *hostaddrs[];
};
/* This structure describes a "team" of threads. These are the threads
that are spawned by a PARALLEL constructs, as well as the work sharing
constructs that the team encounters. */
struct gomp_team
{
/* This is the number of threads in the current team. */
unsigned nthreads;
/* This is number of gomp_work_share structs that have been allocated
as a block last time. */
unsigned work_share_chunk;
/* This is the saved team state that applied to a master thread before
the current thread was created. */
struct gomp_team_state prev_ts;
/* This semaphore should be used by the master thread instead of its
"native" semaphore in the thread structure. Required for nested
parallels, as the master is a member of two teams. */
gomp_sem_t master_release;
/* This points to an array with pointers to the release semaphore
of the threads in the team. */
gomp_sem_t **ordered_release;
/* List of work shares on which gomp_fini_work_share hasn't been
called yet. If the team hasn't been cancelled, this should be
equal to each thr->ts.work_share, but otherwise it can be a possibly
long list of workshares. */
struct gomp_work_share *work_shares_to_free;
/* List of gomp_work_share structs chained through next_free fields.
This is populated and taken off only by the first thread in the
team encountering a new work sharing construct, in a critical
section. */
struct gomp_work_share *work_share_list_alloc;
/* List of gomp_work_share structs freed by free_work_share. New
entries are atomically added to the start of the list, and
alloc_work_share can safely only move all but the first entry
to work_share_list alloc, as free_work_share can happen concurrently
with alloc_work_share. */
struct gomp_work_share *work_share_list_free;
#ifdef HAVE_SYNC_BUILTINS
/* Number of simple single regions encountered by threads in this
team. */
unsigned long single_count;
#else
/* Mutex protecting addition of workshares to work_share_list_free. */
gomp_mutex_t work_share_list_free_lock;
#endif
/* This barrier is used for most synchronization of the team. */
gomp_barrier_t barrier;
/* Initial work shares, to avoid allocating any gomp_work_share
structs in the common case. */
struct gomp_work_share work_shares[8];
gomp_mutex_t task_lock;
/* Scheduled tasks. */
struct priority_queue task_queue;
/* Number of all GOMP_TASK_{WAITING,TIED} tasks in the team. */
unsigned int task_count;
/* Number of GOMP_TASK_WAITING tasks currently waiting to be scheduled. */
unsigned int task_queued_count;
/* Number of GOMP_TASK_{WAITING,TIED} tasks currently running
directly in gomp_barrier_handle_tasks; tasks spawned
from e.g. GOMP_taskwait or GOMP_taskgroup_end don't count, even when
that is called from a task run from gomp_barrier_handle_tasks.
task_running_count should be always <= team->nthreads,
and if current task isn't in_tied_task, then it will be
even < team->nthreads. */
unsigned int task_running_count;
int work_share_cancelled;
int team_cancelled;
/* Number of tasks waiting for their completion event to be fulfilled. */
unsigned int task_detach_count;
/* This array contains structures for implicit tasks. */
struct gomp_task implicit_task[];
};
/* This structure contains all data that is private to libgomp and is
allocated per thread. */
struct gomp_thread
{
/* This is the function that the thread should run upon launch. */
void (*fn) (void *data);
void *data;
/* This is the current team state for this thread. The ts.team member
is NULL only if the thread is idle. */
struct gomp_team_state ts;
/* This is the task that the thread is currently executing. */
struct gomp_task *task;
/* This semaphore is used for ordered loops. */
gomp_sem_t release;
/* Place this thread is bound to plus one, or zero if not bound
to any place. */
unsigned int place;
/* User pthread thread pool */
struct gomp_thread_pool *thread_pool;
#ifdef LIBGOMP_USE_PTHREADS
/* omp_get_num_teams () - 1. */
unsigned int num_teams;
/* omp_get_team_num (). */
unsigned int team_num;
#endif
#if defined(LIBGOMP_USE_PTHREADS) \
&& (!defined(HAVE_TLS) \
|| !defined(__GLIBC__) \
|| !defined(USING_INITIAL_EXEC_TLS))
/* pthread_t of the thread containing this gomp_thread.
On Linux when using initial-exec TLS,
(typeof (pthread_t)) gomp_thread () - pthread_self ()
is constant in all threads, so we can optimize and not
store it. */
#define GOMP_NEEDS_THREAD_HANDLE 1
pthread_t handle;
#endif
};
struct gomp_thread_pool
{
/* This array manages threads spawned from the top level, which will
return to the idle loop once the current PARALLEL construct ends. */
struct gomp_thread **threads;
unsigned threads_size;
unsigned threads_used;
/* The last team is used for non-nested teams to delay their destruction to
make sure all the threads in the team move on to the pool's barrier before
the team's barrier is destroyed. */
struct gomp_team *last_team;
/* Number of threads running in this contention group. */
unsigned long threads_busy;
/* This barrier holds and releases threads waiting in thread pools. */
gomp_simple_barrier_t threads_dock;
};
enum gomp_cancel_kind
{
GOMP_CANCEL_PARALLEL = 1,
GOMP_CANCEL_LOOP = 2,
GOMP_CANCEL_FOR = GOMP_CANCEL_LOOP,
GOMP_CANCEL_DO = GOMP_CANCEL_LOOP,
GOMP_CANCEL_SECTIONS = 4,
GOMP_CANCEL_TASKGROUP = 8
};
/* ... and here is that TLS data. */
#if defined __nvptx__
extern struct gomp_thread *nvptx_thrs __attribute__((shared));
static inline struct gomp_thread *gomp_thread (void)
{
int tid;
asm ("mov.u32 %0, %%tid.y;" : "=r" (tid));
return nvptx_thrs + tid;
}
#elif defined __AMDGCN__
static inline struct gomp_thread *gcn_thrs (void)
{
/* The value is at the bottom of LDS. */
struct gomp_thread * __lds *thrs = (struct gomp_thread * __lds *)4;
return *thrs;
}
static inline void set_gcn_thrs (struct gomp_thread *val)
{
/* The value is at the bottom of LDS. */
struct gomp_thread * __lds *thrs = (struct gomp_thread * __lds *)4;
*thrs = val;
}
static inline struct gomp_thread *gomp_thread (void)
{
int tid = __builtin_gcn_dim_pos(1);
return gcn_thrs () + tid;
}
#elif defined HAVE_TLS || defined USE_EMUTLS
extern __thread struct gomp_thread gomp_tls_data;
static inline struct gomp_thread *gomp_thread (void)
{
return &gomp_tls_data;
}
#else
extern pthread_key_t gomp_tls_key;
static inline struct gomp_thread *gomp_thread (void)
{
return pthread_getspecific (gomp_tls_key);
}
#endif
extern struct gomp_task_icv *gomp_new_icv (void);
/* Here's how to access the current copy of the ICVs. */
static inline struct gomp_task_icv *gomp_icv (bool write)
{
struct gomp_task *task = gomp_thread ()->task;
if (task)
return &task->icv;
else if (write)
return gomp_new_icv ();
else
return &gomp_global_icv;
}
#ifdef LIBGOMP_USE_PTHREADS
/* The attributes to be used during thread creation. */
extern pthread_attr_t gomp_thread_attr;