Ecore Idle functions

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The idler functionality in Ecore allows for callbacks to be called when the program isn't handling events, timers or fd handlers.

There are three types of idlers: Enterers, Idlers(proper) and Exiters. They are called, respectively, when the program is about to enter an idle state, when the program is in an idle state and when the program has just left an idle state and will begin processing events, timers or fd handlers.

Enterer callbacks are good for updating your program's state, if it has a state engine. Once all of the enterer handlers are called, the program will enter a "sleeping" state.

Idler callbacks are called when the main loop has called all enterer handlers. They are useful for interfaces that require polling and timers would be too slow to use.

Exiter callbacks are called when the main loop wakes up from an idle state.

If no idler callbacks are specified, then the process literally goes to sleep. Otherwise, the idler callbacks are called continuously while the loop is "idle", using as much CPU as is available to the process.

Note:

Idle state doesn't mean that the program is idle, but that the main loop is idle. It doesn't have any timers, events, fd handlers or anything else to process (which in most event driven programs also means that the program is idle too, but it's not a rule). The program itself may be doing a lot of processing in the idler, or in another thread, for example.

Example with functions that deal with idle state:

• ecore idle state - Idlers, enterers and exiters

Functions
Ecore_Idler *	ecore_idler_add (Ecore_Task_Cb func, const void *data)
void *	ecore_idler_del (Ecore_Idler *idler)
Ecore_Idle_Enterer *	ecore_idle_enterer_add (Ecore_Task_Cb func, const void *data)
Ecore_Idle_Enterer *	ecore_idle_enterer_before_add (Ecore_Task_Cb func, const void *data)
void *	ecore_idle_enterer_del (Ecore_Idle_Enterer *idle_enterer)
Ecore_Idle_Exiter *	ecore_idle_exiter_add (Ecore_Task_Cb func, const void *data)
void *	ecore_idle_exiter_del (Ecore_Idle_Exiter *idle_exiter)
Typedefs
typedef Eo	Ecore_Idler
typedef Eo	Ecore_Idle_Enterer
typedef Eo	Ecore_Idle_Exiter

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Typedef Documentation

typedef Eo Ecore_Idle_Enterer

A handle for idle enterers

typedef Eo Ecore_Idle_Exiter

A handle for idle exiters

typedef Eo Ecore_Idler

A handle for idlers

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Function Documentation

Ecore_Idle_Enterer* ecore_idle_enterer_add	(	Ecore_Task_Cb	func,
		const void *	data
	)

Adds an idle enterer handler.

Parameters:

func	The function to call when entering an idle state.
data	The data to be passed to the func call

Returns:

A handle to the idle enterer callback if successful. Otherwise, NULL is returned.

Note:

The function func will be called every time the main loop is entering idle state, as long as it returns 1 (or ECORE_CALLBACK_RENEW). A return of 0 (or ECORE_CALLBACK_CANCEL) deletes the idle enterer.

Since :

2.3

Examples:

ecore_idler_example.c.

Ecore_Idle_Enterer* ecore_idle_enterer_before_add	(	Ecore_Task_Cb	func,
		const void *	data
	)

Adds an idle enterer handler at the start of the list so it gets called earlier than others.

Parameters:

func	The function to call when entering an idle state.
data	The data to be passed to the func call

Returns:

A handle to the idle enterer callback if successful. Otherwise, NULL is returned.

Note:

The function func will be called every time the main loop is entering idle state, as long as it returns 1 (or ECORE_CALLBACK_RENEW). A return of 0 (or ECORE_CALLBACK_CANCEL) deletes the idle enterer.

Since :

2.3

void* ecore_idle_enterer_del

(

Ecore_Idle_Enterer *

idle_enterer

)

Deletes an idle enterer callback.

Parameters:

idle_enterer

The idle enterer to delete

Returns:

The data pointer passed to the idler enterer callback on success. NULL otherwise.

Since :

2.3

Examples:

ecore_idler_example.c.

Ecore_Idle_Exiter* ecore_idle_exiter_add	(	Ecore_Task_Cb	func,
		const void *	data
	)

Adds an idle exiter handler.

Parameters:

func	The function to call when exiting an idle state.
data	The data to be passed to the func call.

Returns:

A handle to the idle exiter callback on success. NULL otherwise.

Note:

The function func will be called every time the main loop is exiting idle state, as long as it returns 1 (or ECORE_CALLBACK_RENEW). A return of 0 (or ECORE_CALLBACK_CANCEL) deletes the idle exiter.

Since :

2.3

Examples:

ecore_idler_example.c.

void* ecore_idle_exiter_del

(

Ecore_Idle_Exiter *

idle_exiter

)

Deletes an idle exiter handler from the list to be run on exiting idle state.

Parameters:

idle_exiter

The idle exiter to delete

Returns:

The data pointer that was being being passed to the handler if successful. NULL otherwise.

Since :

2.3

Examples:

ecore_idler_example.c.

Ecore_Idler* ecore_idler_add	(	Ecore_Task_Cb	func,
		const void *	data
	)

Adds an idler handler.

Parameters:

func	The function to call when idling.
data	The data to be passed to this func call.

Returns:

A idler handle if successfully added, NULL otherwise.

Add an idler handle to the event loop, returning a handle on success and NULL otherwise. The function func will be called repeatedly while no other events are ready to be processed, as long as it returns 1 (or ECORE_CALLBACK_RENEW). A return of 0 (or ECORE_CALLBACK_CANCEL) deletes the idler.

Idlers are useful for progressively processing data without blocking.

Since :

2.3

Examples:

ecore_idler_example.c.

void* ecore_idler_del

(

Ecore_Idler *

idler

)

Deletes an idler callback from the list to be executed.

Parameters:

idler

The handle of the idler callback to delete

Returns:

The data pointer passed to the idler callback on success, NULL otherwise.

Since :

2.3