Differential D7475 Diff 23940 source/blender/blenlib/BLI_task.h

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source/blender/blenlib/BLI_task.h

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*		*
* Central scheduler that holds running threads ready to execute tasks. A single		* Central scheduler that holds running threads ready to execute tasks. A single
* queue holds the task from all pools.		* queue holds the task from all pools.
*		*
* Init/exit must be called before/after any task pools are created/freed, and		* Init/exit must be called before/after any task pools are created/freed, and
* must be called from the main threads. All other scheduler and pool functions		* must be called from the main threads. All other scheduler and pool functions
* are thread-safe. */		* are thread-safe. */

typedef struct TaskScheduler TaskScheduler;		// typedef struct TaskScheduler TaskScheduler;
		jbakkerAuthorUnsubmitted Done Inline Actions Remove line jbakker: Remove line
		void BLI_task_scheduler_init(void);
TaskScheduler *BLI_task_scheduler_create(int num_threads);		void BLI_task_scheduler_exit(void);
void BLI_task_scheduler_free(TaskScheduler *scheduler);		int BLI_task_scheduler_num_threads(void);

int BLI_task_scheduler_num_threads(TaskScheduler *scheduler);

/* Task Pool		/* Task Pool
*		*
* Pool of tasks that will be executed by the central TaskScheduler. For each		* Pool of tasks that will be executed by the central TaskScheduler. For each
* pool, we can wait for all tasks to be done, or cancel them before they are		* pool, we can wait for all tasks to be done, or cancel them before they are
* done.		* done.
*		*
* Running tasks may spawn new tasks.		* Running tasks may spawn new tasks.
*		*
* Pools may be nested, i.e. a thread running a task can create another task		* Pools may be nested, i.e. a thread running a task can create another task
* pool with smaller tasks. When other threads are busy they will continue		* pool with smaller tasks. When other threads are busy they will continue
* working on their own tasks, if not they will join in, no new threads will		* working on their own tasks, if not they will join in, no new threads will
* be launched.		* be launched.
*/		*/

typedef enum TaskPriority {		typedef enum TaskPriority {
TASK_PRIORITY_LOW,		TASK_PRIORITY_LOW,
TASK_PRIORITY_HIGH,		TASK_PRIORITY_HIGH,
} TaskPriority;		} TaskPriority;

typedef struct TaskPool TaskPool;		typedef struct TaskPool TaskPool;
typedef void (TaskRunFunction)(TaskPool __restrict pool, void *taskdata, int threadid);		typedef void (TaskRunFunction)(TaskPool __restrict pool, void *taskdata);
typedef void (TaskFreeFunction)(TaskPool __restrict pool, void *taskdata);		typedef void (TaskFreeFunction)(TaskPool __restrict pool, void *taskdata);

TaskPool BLI_task_pool_create(TaskScheduler scheduler, void *userdata, TaskPriority priority);		TaskPool BLI_task_pool_create(void userdata, TaskPriority priority);
TaskPool BLI_task_pool_create_background(TaskScheduler scheduler,		TaskPool BLI_task_pool_create_background(void userdata, TaskPriority priority);
void *userdata,		TaskPool BLI_task_pool_create_suspended(void userdata, TaskPriority priority);
TaskPriority priority);		TaskPool BLI_task_pool_create_no_threads(void userdata);
TaskPool BLI_task_pool_create_suspended(TaskScheduler scheduler,		TaskPool BLI_task_pool_create_background_serial(void userdata, TaskPriority priority);
void *userdata,
TaskPriority priority);
void BLI_task_pool_free(TaskPool *pool);		void BLI_task_pool_free(TaskPool *pool);

void BLI_task_pool_push(TaskPool *pool,		void BLI_task_pool_push(TaskPool *pool,
TaskRunFunction run,		TaskRunFunction run,
void *taskdata,		void *taskdata,
bool free_taskdata,		bool free_taskdata,
TaskFreeFunction freedata);		TaskFreeFunction freedata);
void BLI_task_pool_push_from_thread(TaskPool *pool,
TaskRunFunction run,
void *taskdata,
bool free_taskdata,
TaskFreeFunction freedata,
int thread_id);

/* work and wait until all tasks are done */		/* work and wait until all tasks are done */
void BLI_task_pool_work_and_wait(TaskPool *pool);		void BLI_task_pool_work_and_wait(TaskPool *pool);
/* work and wait until all tasks are done, then reset to the initial suspended state */
void BLI_task_pool_work_wait_and_reset(TaskPool *pool);
/* cancel all tasks, keep worker threads running */		/* cancel all tasks, keep worker threads running */
void BLI_task_pool_cancel(TaskPool *pool);		void BLI_task_pool_cancel(TaskPool *pool);

/* for worker threads, test if canceled */		/* for worker threads, test if canceled */
bool BLI_task_pool_canceled(TaskPool *pool);		bool BLI_task_pool_canceled(TaskPool *pool);

/* optional userdata pointer to pass along to run function */		/* optional userdata pointer to pass along to run function */
void BLI_task_pool_user_data(TaskPool pool);		void BLI_task_pool_user_data(TaskPool pool);

/* optional mutex to use from run function */		/* optional mutex to use from run function */
ThreadMutex BLI_task_pool_user_mutex(TaskPool pool);		ThreadMutex BLI_task_pool_user_mutex(TaskPool pool);

/* Thread ID of thread that created the task pool. */
int BLI_task_pool_creator_thread_id(TaskPool *pool);

/* Delayed push, use that to reduce thread overhead by accumulating
* all new tasks into local queue first and pushing it to scheduler
* from within a single mutex lock.
*/
void BLI_task_pool_delayed_push_begin(TaskPool *pool, int thread_id);
void BLI_task_pool_delayed_push_end(TaskPool *pool, int thread_id);

/* Parallel for routines */		/* Parallel for routines */

typedef enum eTaskSchedulingMode {
/* Task scheduler will divide overall work into equal chunks, scheduling
* even chunks to all worker threads.
* Least run time benefit, ideal for cases when each task requires equal
* amount of compute power.
*/
TASK_SCHEDULING_STATIC,
/* Task scheduler will schedule small amount of work to each worker thread.
* Has more run time overhead, but deals much better with cases when each
* part of the work requires totally different amount of compute power.
*/
TASK_SCHEDULING_DYNAMIC,
} eTaskSchedulingMode;

/* Per-thread specific data passed to the callback. */		/* Per-thread specific data passed to the callback. */
typedef struct TaskParallelTLS {		typedef struct TaskParallelTLS {
/* Identifier of the thread who this data belongs to. */
int thread_id;
/* Copy of user-specifier chunk, which is copied from original chunk to all		/* Copy of user-specifier chunk, which is copied from original chunk to all
* worker threads. This is similar to OpenMP's firstprivate.		* worker threads. This is similar to OpenMP's firstprivate.
*/		*/
void *userdata_chunk;		void *userdata_chunk;
} TaskParallelTLS;		} TaskParallelTLS;

typedef void (TaskParallelRangeFunc)(void __restrict userdata,		typedef void (TaskParallelRangeFunc)(void __restrict userdata,
const int iter,		const int iter,
const TaskParallelTLS *__restrict tls);		const TaskParallelTLS *__restrict tls);
typedef void (TaskParallelReduceFunc)(const void __restrict userdata,		typedef void (TaskParallelReduceFunc)(const void __restrict userdata,
void *__restrict chunk_join,		void *__restrict chunk_join,
void *__restrict chunk);		void *__restrict chunk);

typedef void (TaskParallelFreeFunc)(const void __restrict userdata, void *__restrict chunk);		typedef void (TaskParallelFreeFunc)(const void __restrict userdata, void *__restrict chunk);

typedef struct TaskParallelSettings {		typedef struct TaskParallelSettings {
/* Whether caller allows to do threading of the particular range.		/* Whether caller allows to do threading of the particular range.
* Usually set by some equation, which forces threading off when threading		* Usually set by some equation, which forces threading off when threading
* overhead becomes higher than speed benefit.		* overhead becomes higher than speed benefit.
* BLI_task_parallel_range() by itself will always use threading when range		* BLI_task_parallel_range() by itself will always use threading when range
* is higher than a chunk size. As in, threading will always be performed.		* is higher than a chunk size. As in, threading will always be performed.
*/		*/
bool use_threading;		bool use_threading;
/* Scheduling mode to use for this parallel range invocation. */
eTaskSchedulingMode scheduling_mode;
/* Each instance of looping chunks will get a copy of this data		/* Each instance of looping chunks will get a copy of this data
* (similar to OpenMP's firstprivate).		* (similar to OpenMP's firstprivate).
*/		*/
void userdata_chunk; / Pointer to actual data. */		void userdata_chunk; / Pointer to actual data. */
size_t userdata_chunk_size; /* Size of that data. */		size_t userdata_chunk_size; /* Size of that data. */
/* Function called from calling thread once whole range have been		/* Function called from calling thread once whole range have been
* processed.		* processed.
*/		*/
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} TaskParallelSettings;		} TaskParallelSettings;

BLI_INLINE void BLI_parallel_range_settings_defaults(TaskParallelSettings *settings);		BLI_INLINE void BLI_parallel_range_settings_defaults(TaskParallelSettings *settings);

void BLI_task_parallel_range(const int start,		void BLI_task_parallel_range(const int start,
const int stop,		const int stop,
void *userdata,		void *userdata,
TaskParallelRangeFunc func,		TaskParallelRangeFunc func,
TaskParallelSettings *settings);		const TaskParallelSettings *settings);

typedef struct TaskParallelRangePool TaskParallelRangePool;
struct TaskParallelRangePool *BLI_task_parallel_range_pool_init(
const struct TaskParallelSettings *settings);
void BLI_task_parallel_range_pool_push(struct TaskParallelRangePool *range_pool,
const int start,
const int stop,
void *userdata,
TaskParallelRangeFunc func,
const struct TaskParallelSettings *settings);
void BLI_task_parallel_range_pool_work_and_wait(struct TaskParallelRangePool *range_pool);
void BLI_task_parallel_range_pool_free(struct TaskParallelRangePool *range_pool);

/* This data is shared between all tasks, its access needs thread lock or similar protection.		/* This data is shared between all tasks, its access needs thread lock or similar protection.
*/		*/
typedef struct TaskParallelIteratorStateShared {		typedef struct TaskParallelIteratorStateShared {
/* Maximum amount of items to acquire at once. */		/* Maximum amount of items to acquire at once. */
int chunk_size;		int chunk_size;
/* Next item to be acquired. */		/* Next item to be acquired. */
void *next_item;		void *next_item;
Show All 38 Lines	void BLI_task_parallel_mempool(struct BLI_mempool *mempool,
TaskParallelMempoolFunc func,		TaskParallelMempoolFunc func,
const bool use_threading);		const bool use_threading);

/* TODO(sergey): Think of a better place for this. */		/* TODO(sergey): Think of a better place for this. */
BLI_INLINE void BLI_parallel_range_settings_defaults(TaskParallelSettings *settings)		BLI_INLINE void BLI_parallel_range_settings_defaults(TaskParallelSettings *settings)
{		{
memset(settings, 0, sizeof(*settings));		memset(settings, 0, sizeof(*settings));
settings->use_threading = true;		settings->use_threading = true;
settings->scheduling_mode = TASK_SCHEDULING_STATIC;
/* Use default heuristic to define actual chunk size. */		/* Use default heuristic to define actual chunk size. */
settings->min_iter_per_thread = 0;		settings->min_iter_per_thread = 0;
}		}

		/* Don't use this, store any thread specific data in tls->userdata_chunk instead.
		* Ony here for code to be removed. */
		int BLI_task_parallel_thread_id(const TaskParallelTLS *tls);

#ifdef __cplusplus		#ifdef __cplusplus
}		}
#endif		#endif

#endif		#endif