ABT_sched_def Struct Reference

A struct that defines a scheduler. More...

#include <abt.h>

Collaboration diagram for ABT_sched_def:

Data Fields
ABT_sched_type	type
	Unused value. More...
ABT_sched_init_fn	init
	Function that initializes a scheduler. More...
ABT_sched_run_fn	run
	Function that defines a kernel of a scheduler. More...
ABT_sched_free_fn	free
	Function that frees a scheduler. More...
ABT_sched_get_migr_pool_fn	get_migr_pool
	Function that returns a pool for migration. More...

Detailed Description

A struct that defines a scheduler.

Definition at line 1411 of file abt.h.

Field Documentation

free

int(* ABT_sched_def::free)(ABT_sched sched)

Function that frees a scheduler.

free() finalizes the scheduler sched with the scheduler. The return value of free() is ignored.

free() is optional, so the user may set free to NULL.

free() is called only on freeing a scheduler. free() is not called when its associated work unit is terminated.

The caller of free() is undefined, so a program that relies on the caller of free() is non-conforming.

Definition at line 1492 of file abt.h.

get_migr_pool

ABT_pool(* ABT_sched_def::get_migr_pool)(ABT_sched sched)

Function that returns a pool for migration.

get_migr_pool() returns a pool from pools associated with the scheduler sched as a work unit migration target. If get_migr_pool() returns either ABT_POOL_NULL or a pool that is not associated with sched, the results are undefined.

get_migr_pool() is optional, so the user may set get_migr_pool to NULL. If get_migr_pool is NULL, the Argobots runtime chooses a proper pool that is associated with sched.

The caller of get_migr_pool() is undefined, so a program that relies on the caller of get_migr_pool() is non-conforming.

Definition at line 1509 of file abt.h.

init

int(* ABT_sched_def::init)(ABT_sched sched, ABT_sched_config config)

Function that initializes a scheduler.

init() initializes the scheduler sched with the scheduler configuration config. If init() does not return ABT_SUCCESS, the scheduler creation fails.

init() is optional, so the user may set init to NULL.

Note

The caller of init() is undefined, so a program that relies on the caller of init() is non-conforming.

init() is called only on creating a scheduler. init() is not called when its associated work unit is revived.

Definition at line 1436 of file abt.h.

run

void(* ABT_sched_def::run)(ABT_sched sched)

Function that defines a kernel of a scheduler.

run() runs the scheduler sched. The user can freely design this function, Argobots assumes the following properties:

• Scheduling loop:

  run() pops units from pools associated with sched and run it.

  sched can access pools that are not associated with sched. However, the Argobots runtime assumes that a scheduler that does not have units in its associated pools is idle and should yield to the parent.

• Periodic event check:

  run() calls ABT_xstream_check_events() with sched periodically.

  The frequency is user-defined, but some Argobots routines such as request handling rely on ABT_xstream_check_events().

• Finish run() if necessary:

  run() calls ABT_sched_has_to_stop() with sched periodically and if it returns ABT_TRUE as stop, run() should return immediately.

  The frequency is user-defined, but some Argobots routines such as request handling rely on the mechanism of ABT_sched_has_to_stop().

The caller of run() is a work unit associated with sched. If sched is the main scheduler, the underlying execution stream is unchanged in run().

run() is not optional, so the user must implement this function.

Definition at line 1476 of file abt.h.

type

ABT_sched_type ABT_sched_def::type

Unused value.

This value is ignored. A created scheduler always uses a ULT as an underlying work unit.

Definition at line 1418 of file abt.h.

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The documentation for this struct was generated from the following file:

• src/include/abt.h