Ecore poller provides infrastructure for the creation of pollers. More...

Typedefs

typedef struct _Ecore_Poller Ecore_Poller
 A handle for pollers.
 

Enumerations

enum  _Ecore_Poller_Type { ECORE_POLLER_CORE = 0 }
 Defines the frequency of ticks for the poller. More...
 

Functions

EAPI void ecore_poller_poll_interval_set (Ecore_Poller_Type type, double poll_time)
 Sets the time(in seconds) between ticks for the given poller type. More...
 
EAPI double ecore_poller_poll_interval_get (Ecore_Poller_Type type)
 Gets the time(in seconds) between ticks for the given poller type. More...
 
EAPI Eina_Bool ecore_poller_poller_interval_set (Ecore_Poller *poller, int interval)
 Changes the polling interval rate of poller. More...
 
EAPI int ecore_poller_poller_interval_get (Ecore_Poller *poller)
 Gets the polling interval rate of poller. More...
 
EAPI Ecore_Pollerecore_poller_add (Ecore_Poller_Type type, int interval, Ecore_Task_Cb func, const void *data)
 Creates a poller to call the given function at a particular tick interval. More...
 
EAPI void * ecore_poller_del (Ecore_Poller *poller)
 Delete the specified poller from the timer list. More...
 

Detailed Description

Ecore poller provides infrastructure for the creation of pollers.

Pollers are, in essence, callbacks that share a single timer per type. Because not all pollers need to be called at the same frequency the user may specify the frequency in ticks(each expiration of the shared timer is called a tick, in ecore poller parlance) for each added poller. Ecore pollers should only be used when the poller doesn't have specific requirements on the exact times to poll.

This architecture means that the main loop is only woken up once to handle all pollers of that type, this will save power as the CPU has more of a chance to go into a low power state the longer it is asleep for, so this should be used in situations where power usage is a concern.

For now only 1 core poller type is supported: ECORE_POLLER_CORE, the default interval for ECORE_POLLER_CORE is 0.125(or 1/8th) second.

The creation of a poller is extremely simple and only requires one line:

ecore_poller_add(ECORE_POLLER_CORE, 1, my_poller_function, NULL);

This sample creates a poller to call my_poller_function at every tick with NULL as data.

Example:

Enumeration Type Documentation

Defines the frequency of ticks for the poller.

Enumerator
ECORE_POLLER_CORE 

The core poller interval.

Function Documentation

EAPI Ecore_Poller* ecore_poller_add ( Ecore_Poller_Type  type,
int  interval,
Ecore_Task_Cb  func,
const void *  data 
)

Creates a poller to call the given function at a particular tick interval.

Parameters
typeThe ticker type to attach the poller to. Must be ECORE_POLLER_CORE.
intervalThe poll interval.
funcThe poller function.
dataData to pass to func when it is called.
Returns
A poller object on success, NULL otherwise.

This function adds func as a poller callback that will be called every interval ticks together with other pollers of type type. func will be passed the data pointer as a parameter.

The interval must be between 1 and 32768 inclusive, and must be a power of 2 (i.e. 1, 2, 4, 8, 16, ... 16384, 32768). The exact tick in which func will be called is undefined, as only the interval between calls can be defined. Ecore will endeavor to keep pollers synchronized and to call as many in 1 wakeup event as possible. If interval is not a power of two, the closest power of 2 greater than interval will be used.

When the poller func is called, it must return a value of either ECORE_CALLBACK_RENEW(or 1) or ECORE_CALLBACK_CANCEL(or 0). If it returns 1, it will be called again at the next tick, or if it returns 0 it will be deleted automatically making any references/handles for it invalid.

Examples:
ecore_poller_example.c.
EAPI void* ecore_poller_del ( Ecore_Poller poller)

Delete the specified poller from the timer list.

Parameters
pollerThe poller to delete.
Returns
The data pointer set for the timer when ecore_poller_add was called on success, NULL otherwise.
Note
poller must be a valid handle. If the poller function has already returned 0, the handle is no longer valid (and does not need to be deleted).
Examples:
ecore_poller_example.c.
EAPI double ecore_poller_poll_interval_get ( Ecore_Poller_Type  type)

Gets the time(in seconds) between ticks for the given poller type.

Parameters
typeThe poller type to query.
Returns
The time in seconds between ticks of the poller timer.

This will get the time between ticks of the specified poller timer.

EAPI void ecore_poller_poll_interval_set ( Ecore_Poller_Type  type,
double  poll_time 
)

Sets the time(in seconds) between ticks for the given poller type.

Parameters
typeThe poller type to adjust.
poll_timeThe time(in seconds) between ticks of the timer.

This will adjust the time between ticks of the given timer type defined by type to the time period defined by poll_time.

Examples:
ecore_poller_example.c.
EAPI int ecore_poller_poller_interval_get ( Ecore_Poller poller)

Gets the polling interval rate of poller.

Parameters
pollerThe Ecore_Poller to change the interval of.
Returns
Returns the interval, in ticks, that poller polls at.

This returns a poller's polling interval, or 0 on error.

EAPI Eina_Bool ecore_poller_poller_interval_set ( Ecore_Poller poller,
int  interval 
)

Changes the polling interval rate of poller.

Parameters
pollerThe Ecore_Poller to change the interval of.
intervalThe tick interval to set; must be a power of 2 and <= 32768.
Returns
Returns true on success, false on failure.

This allows the changing of a poller's polling interval. It is useful when you want to alter a poll rate without deleting and re-creating a poller.

Examples:
ecore_poller_example.c.