Intel(R) Threading Building Blocks Doxygen Documentation
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17 #ifndef _TBB_scheduler_H
18 #define _TBB_scheduler_H
25 #include "../rml/include/rml_tbb.h"
29 #if __TBB_SURVIVE_THREAD_SWITCH
33 #if __TBB_PREVIEW_RESUMABLE_TASKS
40 template<
typename SchedulerTraits>
class custom_scheduler;
46 #define EmptyTaskPool ((task**)0)
47 #define LockedTaskPool ((task**)~(intptr_t)0)
58 #if __TBB_PREVIEW_CRITICAL_TASKS
59 bool has_taken_critical_task : 1;
62 #if __TBB_PREVIEW_RESUMABLE_TASKS
68 #if __TBB_PREVIEW_RESUMABLE_TASKS
70 #elif __TBB_PREVIEW_CRITICAL_TASKS
103 #if __TBB_SCHEDULER_OBSERVER
104 observer_proxy* my_last_global_observer;
108 #if __TBB_ARENA_OBSERVER
109 observer_proxy* my_last_local_observer;
112 #if __TBB_TASK_PRIORITY
116 volatile intptr_t *my_ref_top_priority;
119 volatile uintptr_t *my_ref_reload_epoch;
121 #if __TBB_PREVIEW_RESUMABLE_TASKS
126 tbb::atomic<bool>* my_current_is_recalled;
147 #if __TBB_PREVIEW_CRITICAL_TASKS
157 uintptr_t my_rsb_stealing_threshold;
180 #if __TBB_HOARD_NONLOCAL_TASKS
181 task* my_nonlocal_free_list;
199 #if __TBB_COUNT_TASK_NODES
200 intptr_t my_task_node_count;
204 #if __TBB_PREVIEW_RESUMABLE_TASKS
205 enum post_resume_action {
216 typedef void(*suspend_callback_t)(
void*, task::suspend_point);
220 suspend_callback_t suspend_callback;
222 task::suspend_point tag;
225 if (suspend_callback) {
226 __TBB_ASSERT(suspend_callback && user_callback && tag, NULL);
227 suspend_callback(user_callback, tag);
233 co_context my_co_context;
236 post_resume_action my_post_resume_action;
239 void* my_post_resume_arg;
245 void set_post_resume_action(post_resume_action,
void* arg);
248 void do_post_resume_action();
258 bool resume_original_scheduler();
263 friend void recall_function(task::suspend_point tag);
333 #if __TBB_TASK_ISOLATION
358 #if __TBB_PREVIEW_CRITICAL_TASKS
364 bool handled_as_critical(
task& t );
393 #if TBB_USE_ASSERT > 1
429 template<free_task_h
int h>
453 #if __TBB_COUNT_TASK_NODES
454 intptr_t get_task_node_count(
bool count_arena_workers =
false );
474 #if __TBB_TASK_GROUP_CONTEXT
500 uintptr_t my_context_state_propagation_epoch;
506 tbb::atomic<uintptr_t> my_local_ctx_list_update;
508 #if __TBB_TASK_PRIORITY
509 inline intptr_t effective_reference_priority ()
const;
514 task* my_offloaded_tasks;
517 task** my_offloaded_task_list_tail_link;
520 uintptr_t my_local_reload_epoch;
523 volatile bool my_pool_reshuffling_pending;
540 inline void offload_task (
task& t, intptr_t task_priority );
545 void cleanup_local_context_list ();
549 template <
typename T>
558 __TBB_ASSERT(is_alive(ctx),
"referenced task_group_context was destroyed");
559 static const char *msg =
"task_group_context is invalid";
568 #if __TBB_TASK_PRIORITY
572 #if TBB_USE_ASSERT > 1
584 ::rml::server::execution_resource_t master_exec_resource;
588 #if __TBB_TASK_GROUP_CONTEXT
591 tbb::atomic<uintptr_t> my_nonlocal_ctx_list_update;
594 #if __TBB_SURVIVE_THREAD_SWITCH
605 cilk_state_t my_cilk_state;
613 mutable statistics_counters my_counters;
661 #if __TBB_TASK_GROUP_CONTEXT
687 p.extra_state = 0xFF;
691 #if __TBB_COUNT_TASK_NODES
692 --my_task_node_count;
696 #if __TBB_COUNT_TASK_NODES
697 inline intptr_t generic_scheduler::get_task_node_count(
bool count_arena_workers ) {
698 return my_task_node_count + (count_arena_workers?
my_arena->workers_task_node_count(): 0);
711 __TBB_ASSERT ( new_tail <= my_arena_slot->my_task_pool_size,
"task deque end was overwritten" );
721 "Task pool must be locked when calling commit_relocated_tasks()" );
729 template<free_task_h
int h
int>
731 #if __TBB_HOARD_NONLOCAL_TASKS
745 #if __TBB_PREVIEW_RESUMABLE_TASKS
755 }
else if( !(
h&
local_task) &&
p.origin && uintptr_t(
p.origin) < uintptr_t(4096) ) {
760 #if __TBB_HOARD_NONLOCAL_TASKS
762 p.next = my_nonlocal_free_list;
763 my_nonlocal_free_list = &t;
773 #if __TBB_TASK_PRIORITY
774 inline intptr_t generic_scheduler::effective_reference_priority ()
const {
785 inline void generic_scheduler::offload_task (
task& t, intptr_t ) {
788 __TBB_ASSERT( my_offloaded_task_list_tail_link && !*my_offloaded_task_list_tail_link, NULL );
793 my_offloaded_tasks = &t;
797 #if __TBB_PREVIEW_RESUMABLE_TASKS
798 inline void generic_scheduler::set_post_resume_action(post_resume_action pra,
void* arg) {
799 __TBB_ASSERT(my_post_resume_action == PRA_NONE,
"Post resume action has already been set.");
802 my_post_resume_action = pra;
803 my_post_resume_arg = arg;
806 inline bool generic_scheduler::prepare_resume(generic_scheduler& target) {
811 target.set_post_resume_action(PRA_NOTIFY, my_current_is_recalled);
815 target.set_post_resume_action(PRA_CLEANUP,
this);
816 my_target_on_exit = ⌖
822 my_wait_task->prefix().abandoned_scheduler =
this;
823 target.set_post_resume_action(PRA_ABANDON, my_wait_task);
827 inline bool generic_scheduler::resume_original_scheduler() {
829 if (!prepare_resume(target)) {
837 inline void generic_scheduler::resume(generic_scheduler& target) {
841 "The post resume action is not set. Has prepare_resume been called?");
849 #if __TBB_SCHEDULER_OBSERVER
850 target.my_last_global_observer = my_last_global_observer;
852 #if __TBB_ARENA_OBSERVER
853 target.my_last_local_observer = my_last_local_observer;
855 target.attach_mailbox(
affinity_id(target.my_arena_index + 1));
857 #if __TBB_TASK_PRIORITY
858 if (my_offloaded_tasks)
859 my_arena->orphan_offloaded_tasks(*
this);
863 my_co_context.resume(target.my_co_context);
866 do_post_resume_action();
872 inline void generic_scheduler::do_post_resume_action() {
873 __TBB_ASSERT(my_post_resume_action != PRA_NONE,
"The post resume action is not set.");
876 switch (my_post_resume_action) {
879 task_prefix& wait_task_prefix = static_cast<task*>(my_post_resume_arg)->prefix();
880 reference_count old_ref_count = __TBB_FetchAndAddW(&wait_task_prefix.ref_count, internal::abandon_flag);
882 if (old_ref_count == 1) {
886 tbb::task::resume(wait_task_prefix.abandoned_scheduler);
892 callback_t callback = *static_cast<callback_t*>(my_post_resume_arg);
898 generic_scheduler* to_cleanup = static_cast<generic_scheduler*>(my_post_resume_arg);
903 to_cleanup->my_arena->my_co_cache.push(to_cleanup);
908 tbb::atomic<bool>& scheduler_recall_flag = *
static_cast<tbb::atomic<bool>*
>(my_post_resume_arg);
909 scheduler_recall_flag =
true;
917 my_post_resume_action = PRA_NONE;
918 my_post_resume_arg = NULL;
921 struct recall_functor {
922 tbb::atomic<bool>* scheduler_recall_flag;
924 recall_functor(tbb::atomic<bool>* recall_flag_) :
925 scheduler_recall_flag(recall_flag_) {}
927 void operator()(task::suspend_point ) {
928 *scheduler_recall_flag =
true;
938 generic_scheduler&
s = *static_cast<generic_scheduler*>(arg);
943 s.do_post_resume_action();
946 __TBB_ASSERT(
s.my_innermost_running_task ==
s.my_dummy_task, NULL);
948 s.local_wait_for_all(*
s.my_dummy_task, NULL);
951 s.resume(*
s.my_target_on_exit);
957 #if __TBB_TASK_GROUP_CONTEXT
962 template <
bool report_tasks>
963 class context_guard_helper {
964 const task_group_context *curr_ctx;
966 cpu_ctl_env guard_cpu_ctl_env;
967 cpu_ctl_env curr_cpu_ctl_env;
970 context_guard_helper() : curr_ctx( NULL ) {
972 guard_cpu_ctl_env.get_env();
973 curr_cpu_ctl_env = guard_cpu_ctl_env;
976 ~context_guard_helper() {
978 if ( curr_cpu_ctl_env != guard_cpu_ctl_env )
979 guard_cpu_ctl_env.set_env();
981 if ( report_tasks && curr_ctx )
986 void set_ctx(
const task_group_context *ctx ) {
987 generic_scheduler::assert_context_valid( ctx );
989 const cpu_ctl_env &ctl = *punned_cast<cpu_ctl_env*>( &ctx->my_cpu_ctl_env );
991 if ( ctl != curr_cpu_ctl_env ) {
992 curr_cpu_ctl_env = ctl;
993 curr_cpu_ctl_env.set_env();
996 if ( report_tasks && ctx != curr_ctx ) {
1008 #if __TBB_FP_CONTEXT
1009 if ( curr_cpu_ctl_env != guard_cpu_ctl_env ) {
1010 guard_cpu_ctl_env.set_env();
1011 curr_cpu_ctl_env = guard_cpu_ctl_env;
bool can_steal()
Returns true if stealing is allowed.
internal::task_prefix & prefix(internal::version_tag *=NULL) const
Get reference to corresponding task_prefix.
A lock that occupies a single byte.
__TBB_atomic kind_type my_kind
Flavor of this context: bound or isolated.
void spawn(task &first, task *&next) __TBB_override
For internal use only.
void local_spawn(task *first, task *&next)
task * next_offloaded
Pointer to the next offloaded lower priority task.
#define __TBB_ISOLATION_EXPR(isolation)
A scheduler with a customized evaluation loop.
#define __TBB_ASSERT(predicate, comment)
No-op version of __TBB_ASSERT.
void const char const char int ITT_FORMAT __itt_group_sync x void const char ITT_FORMAT __itt_group_sync s void ITT_FORMAT __itt_group_sync p void ITT_FORMAT p void ITT_FORMAT p no args __itt_suppress_mode_t unsigned int void size_t ITT_FORMAT d void ITT_FORMAT p void ITT_FORMAT p __itt_model_site __itt_model_site_instance ITT_FORMAT p __itt_model_task __itt_model_task_instance ITT_FORMAT p void ITT_FORMAT p void ITT_FORMAT p void size_t ITT_FORMAT d void ITT_FORMAT p const wchar_t ITT_FORMAT s const char ITT_FORMAT s const char ITT_FORMAT s const char ITT_FORMAT s no args void ITT_FORMAT p size_t ITT_FORMAT d no args const wchar_t const wchar_t ITT_FORMAT s __itt_heap_function void size_t int ITT_FORMAT d __itt_heap_function void ITT_FORMAT p __itt_heap_function void void size_t int ITT_FORMAT d no args no args unsigned int ITT_FORMAT u const __itt_domain __itt_id id
task * my_return_list
List of small tasks that have been returned to this scheduler by other schedulers.
#define ITT_NOTIFY(name, obj)
affinity_id my_affinity_id
The mailbox id assigned to this scheduler.
task * my_dummy_task
Fake root task created by slave threads.
void co_local_wait_for_all(void *)
void poison_pointer(T *__TBB_atomic &)
void reset_task_pool_and_leave()
Resets head and tail indices to 0, and leaves task pool.
static const unsigned ref_external
Reference increment values for externals and workers.
void commit_spawned_tasks(size_t new_tail)
Makes newly spawned tasks visible to thieves.
bool is_task_pool_published() const
static const size_t null_arena_index
void local_spawn_root_and_wait(task *first, task *&next)
uintptr_t my_cancellation_requested
Specifies whether cancellation was requested for this task group.
unsigned char
Reserved bits.
void release_task_pool() const
Unlocks the local task pool.
bool cleanup_master(bool blocking_terminate)
Perform necessary cleanup when a master thread stops using TBB.
Used to form groups of tasks.
Bit-field representing properties of a sheduler.
virtual void local_wait_for_all(task &parent, task *child)=0
Class representing source of mail.
arena * my_arena
The arena that I own (if master) or am servicing at the moment (if worker)
bool my_auto_initialized
True if *this was created by automatic TBB initialization.
task **__TBB_atomic task_pool
size_t prepare_task_pool(size_t n)
Makes sure that the task pool can accommodate at least n more elements.
static task * plugged_return_list()
Special value used to mark my_return_list as not taking any more entries.
generic_scheduler(market &, bool)
#define __TBB_store_release
task is running, and will be destroyed after method execute() completes.
size_t my_arena_index
Index of the arena slot the scheduler occupies now, or occupied last time.
void assert_task_pool_valid() const
generic_scheduler * my_scheduler
Scheduler of the thread attached to the slot.
void cleanup_scheduler()
Cleans up this scheduler (the scheduler might be destroyed).
void leave_task_pool()
Leave the task pool.
__TBB_atomic intptr_t my_small_task_count
Number of small tasks that have been allocated by this scheduler.
task * get_task(__TBB_ISOLATION_EXPR(isolation_tag isolation))
Get a task from the local pool.
Bitwise-OR of local_task and small_task.
void attach(mail_outbox &putter)
Attach inbox to a corresponding outbox.
task * steal_task_from(__TBB_ISOLATION_ARG(arena_slot &victim_arena_slot, isolation_tag isolation))
Steal task from another scheduler's ready pool.
void __TBB_store_relaxed(volatile T &location, V value)
unsigned max_threads_in_arena()
Returns the concurrency limit of the current arena.
static generic_scheduler * create_master(arena *a)
Initialize a scheduler for a master thread.
void destroy()
Destroy and deallocate this scheduler object.
#define GATHER_STATISTIC(x)
unsigned short affinity_id
An id as used for specifying affinity.
task * prepare_for_spawning(task *t)
Checks if t is affinitized to another thread, and if so, bundles it as proxy.
mail_outbox & mailbox(affinity_id id)
Get reference to mailbox corresponding to given affinity_id.
bool master_outermost_level() const
True if the scheduler is on the outermost dispatch level in a master thread.
void __TBB_store_with_release(volatile T &location, V value)
void attach_arena(arena *, size_t index, bool is_master)
void nested_arena_entry(arena *, size_t)
void attach_mailbox(affinity_id id)
Memory prefix to a task object.
#define __TBB_ISOLATION_ARG(arg1, isolation)
void enqueue(task &, void *reserved) __TBB_override
For internal use only.
bool is_worker() const
True if running on a worker thread, false otherwise.
task object is on free list, or is going to be put there, or was just taken off.
uintptr_t my_state
Internal state (combination of state flags, currently only may_have_children).
state_type state() const
Current execution state.
const size_t NFS_MaxLineSize
Compile-time constant that is upper bound on cache line/sector size.
void publish_task_pool()
Used by workers to enter the task pool.
static bool is_proxy(const task &t)
True if t is a task_proxy.
task ** lock_task_pool(arena_slot *victim_arena_slot) const
Locks victim's task pool, and returns pointer to it. The pointer can be NULL.
unsigned my_num_workers_allotted
The number of workers that have been marked out by the resource manager to service the arena.
internal::context_list_node_t my_node
Used to form the thread specific list of contexts without additional memory allocation.
void unlock_task_pool(arena_slot *victim_arena_slot, task **victim_task_pool) const
Unlocks victim's task pool.
void const char const char int ITT_FORMAT __itt_group_sync x void const char ITT_FORMAT __itt_group_sync s void ITT_FORMAT __itt_group_sync p void ITT_FORMAT p void ITT_FORMAT p no args __itt_suppress_mode_t unsigned int void size_t ITT_FORMAT d void ITT_FORMAT p void ITT_FORMAT p __itt_model_site __itt_model_site_instance ITT_FORMAT p __itt_model_task __itt_model_task_instance ITT_FORMAT p void ITT_FORMAT p void ITT_FORMAT p void size_t ITT_FORMAT d void ITT_FORMAT p const wchar_t ITT_FORMAT s const char ITT_FORMAT s const char ITT_FORMAT s const char ITT_FORMAT s no args void ITT_FORMAT p size_t ITT_FORMAT d no args const wchar_t const wchar_t ITT_FORMAT s __itt_heap_function void size_t int ITT_FORMAT d __itt_heap_function void ITT_FORMAT p __itt_heap_function void void size_t int ITT_FORMAT d no args no args unsigned int ITT_FORMAT u const __itt_domain __itt_id ITT_FORMAT lu const __itt_domain __itt_id __itt_id parent
uintptr_t my_version_and_traits
Version for run-time checks and behavioral traits of the context.
__TBB_atomic size_t tail
Index of the element following the last ready task in the deque.
intptr_t isolation_tag
A tag for task isolation.
auto first(Container &c) -> decltype(begin(c))
task * my_innermost_running_task
Innermost task whose task::execute() is running. A dummy task on the outermost level.
arena_slot * my_arena_slot
Pointer to the slot in the arena we own at the moment.
virtual task * receive_or_steal_task(__TBB_ISOLATION_ARG(__TBB_atomic reference_count &completion_ref_count, isolation_tag isolation))=0
Try getting a task from other threads (via mailbox, stealing, FIFO queue, orphans adoption).
static const kind_type dying
void * __TBB_get_bsp()
Retrieves the current RSE backing store pointer. IA64 specific.
bool is_quiescent_local_task_pool_empty() const
Disable caching for a small task.
void const char const char int ITT_FORMAT __itt_group_sync s
#define ITT_TASK_BEGIN(type, name, id)
static bool is_version_3_task(task &t)
bool outermost
Indicates that a scheduler is on outermost level.
task object is freshly allocated or recycled.
static void assume_scheduler(generic_scheduler *s)
Temporarily set TLS slot to the given scheduler.
void suppress_unused_warning(const T1 &)
Utility template function to prevent "unused" warnings by various compilers.
static bool is_set(generic_scheduler *s)
Used to check validity of the local scheduler TLS contents.
void spawn_root_and_wait(task &first, task *&next) __TBB_override
For internal use only.
unsigned char extra_state
Miscellaneous state that is not directly visible to users, stored as a byte for compactness.
__TBB_atomic size_t head
Index of the first ready task in the deque.
bool worker_outermost_level() const
True if the scheduler is on the outermost dispatch level in a worker thread.
internal::generic_scheduler * my_owner
Scheduler instance that registered this context in its thread specific list.
Data structure to be inherited by the types that can form intrusive lists.
scheduler_properties my_properties
task is in ready pool, or is going to be put there, or was just taken off.
unsigned char state
A task::state_type, stored as a byte for compactness.
task * steal_task(__TBB_ISOLATION_EXPR(isolation_tag isolation))
Attempts to steal a task from a randomly chosen thread/scheduler.
void free_nonlocal_small_task(task &t)
Free a small task t that that was allocated by a different scheduler.
void free_task(task &t)
Put task on free list.
task_group_context * my_parent
Pointer to the context of the parent cancellation group. NULL for isolated contexts.
Task is known to have been allocated by this scheduler.
context_list_node_t * my_next
static const size_t min_task_pool_size
bool is_local_task_pool_quiescent() const
void deallocate_task(task &t)
Return task object to the memory allocator.
intptr_t reference_count
A reference count.
free_task_hint
Optimization hint to free_task that enables it omit unnecessary tests and code.
Base class for user-defined tasks.
Work stealing task scheduler.
task & allocate_task(size_t number_of_bytes, __TBB_CONTEXT_ARG(task *parent, task_group_context *context))
Allocate task object, either from the heap or a free list.
void const char const char int ITT_FORMAT __itt_group_sync x void const char ITT_FORMAT __itt_group_sync s void ITT_FORMAT __itt_group_sync p void ITT_FORMAT p sync_releasing
A fast random number generator.
market * my_market
The market I am in.
void const char const char int ITT_FORMAT __itt_group_sync p
bool is_quiescent_local_task_pool_reset() const
long my_ref_count
Reference count for scheduler.
void __TBB_EXPORTED_FUNC NFS_Free(void *)
Free memory allocated by NFS_Allocate.
void commit_relocated_tasks(size_t new_tail)
Makes relocated tasks visible to thieves and releases the local task pool.
task_group_context * context
Shared context that is used to communicate asynchronous state changes.
FastRandom my_random
Random number generator used for picking a random victim from which to steal.
context_list_node_t * my_prev
void init_stack_info()
Sets up the data necessary for the stealing limiting heuristics.
unsigned my_num_slots
The number of slots in the arena.
void acquire_task_pool() const
Locks the local task pool.
const size_t task_prefix_reservation_size
Number of bytes reserved for a task prefix.
uintptr_t my_stealing_threshold
Position in the call stack specifying its maximal filling when stealing is still allowed.
static const size_t quick_task_size
If sizeof(task) is <=quick_task_size, it is handled on a free list instead of malloc'd.
Task is known to be a small task.
unsigned num_workers_active() const
The number of workers active in the arena.
static generic_scheduler * create_worker(market &m, size_t index, bool geniune)
Initialize a scheduler for a worker thread.
task * get_mailbox_task(__TBB_ISOLATION_EXPR(isolation_tag isolation))
Attempt to get a task from the mailbox.
void const char const char int ITT_FORMAT __itt_group_sync x void const char ITT_FORMAT __itt_group_sync s void ITT_FORMAT __itt_group_sync p void ITT_FORMAT p void ITT_FORMAT p no args __itt_suppress_mode_t unsigned int void size_t ITT_FORMAT d void ITT_FORMAT p void ITT_FORMAT p __itt_model_site __itt_model_site_instance ITT_FORMAT p __itt_model_task __itt_model_task_instance ITT_FORMAT p void ITT_FORMAT p void ITT_FORMAT p void size_t ITT_FORMAT d void ITT_FORMAT p const wchar_t ITT_FORMAT s const char ITT_FORMAT s const char ITT_FORMAT s const char ITT_FORMAT s no args void ITT_FORMAT p size_t ITT_FORMAT d no args const wchar_t const wchar_t ITT_FORMAT s __itt_heap_function h
intptr_t my_priority
Priority level of the task group (in normalized representation)
T __TBB_load_relaxed(const volatile T &location)
bool outermost_level() const
True if the scheduler is on the outermost dispatch level.
task * my_free_list
Free list of small tasks that can be reused.
static void cleanup_worker(void *arg, bool worker)
Perform necessary cleanup when a worker thread finishes.
bool type
Indicates that a scheduler acts as a master or a worker.
#define __TBB_CONTEXT_ARG(arg1, context)
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