EFL Threading example 5
//Compile with:
//gcc -o efl_thread_5 efl_thread_5.c -g `pkg-config --cflags --libs elementary`
#include <Elementary.h>
static Ecore_Thread *thr = NULL;
static Evas_Object *win = NULL;
static Evas_Object *rect = NULL;
struct info
{
double x, y;
};
// BEGIN - code running in my custom thread instance
//
static void
th_do(void *data EINA_UNUSED, Ecore_Thread *th)
{
double t = 0.0;
// inside our "do" function for the ecore thread, lets do the real work
for (;;)
{
struct info *inf = malloc(sizeof(struct info));
if (inf)
{
inf->x = 200 + (200 * sin(t));
inf->y = 200 + (200 * cos(t));
// now we have recorded the timepoint we pass it as feedback
// back to the mainloop. it will free it when done
ecore_thread_feedback(th, inf);
}
// and sleep and loop
usleep(1000);
t += 0.02;
// in case someone has asked us to cancel - then cancel this loop
// co-operatively (cancelling is co-operative)
if (ecore_thread_check(th)) break;
}
}
//
// END - code running in my custom thread instance
static void // when mainloop gets feedback from worker
th_feedback(void *data EINA_UNUSED, Ecore_Thread *th EINA_UNUSED, void *msg)
{
struct info *inf = msg;
evas_object_move(rect, inf->x - 50, inf->y - 50);
free(inf);
}
// BONUS (optional): called after th_do returns and has NOT been cancelled
static void th_end(void *data EINA_UNUSED, Ecore_Thread *th EINA_UNUSED) { printf("thread ended\n"); }
// BONUS (optional): called in mainloop AFTER thread has finished cancelling
static void th_cancel(void *data EINA_UNUSED, Ecore_Thread *th EINA_UNUSED) { printf("thread cancelled\n"); }
// just test cancelling the thread worker
static void
down(void *data EINA_UNUSED, Evas *e EINA_UNUSED, Evas_Object *obj EINA_UNUSED, void *event_info EINA_UNUSED)
{
if (thr) ecore_thread_cancel(thr);
thr = NULL;
}
// on window delete - cancel thread then delete window and exit mainloop
static void
del(void *data EINA_UNUSED, Evas_Object *obj, void *event_info EINA_UNUSED)
{
if (thr) ecore_thread_cancel(thr);
thr = NULL;
evas_object_del(obj);
elm_exit();
}
EAPI_MAIN int
elm_main(int argc EINA_UNUSED, char **argv EINA_UNUSED)
{
Evas_Object *o;
elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
win = elm_win_util_standard_add("efl-thread-5", "EFL Thread 5");
evas_object_smart_callback_add(win, "delete,request", del, NULL);
o = evas_object_rectangle_add(evas_object_evas_get(win));
evas_object_color_set(o, 50, 80, 180, 255);
evas_object_resize(o, 100, 100);
evas_object_show(o);
evas_object_event_callback_add(o, EVAS_CALLBACK_MOUSE_DOWN, down, NULL);
rect = o;
// explicitly create ecore thread to do some "work on the side" and pass
// in NULL as data ptr to callbacks and true at the end means to actually
// make a new thread and not use the thread pool (there is a thread pool
// with as many thread workers as there are cpu's so this means you do not
// overload the cpu's with more work than you actually have processing
// units *IF* your threads do actually spend their time doing actual
// heavy computation)
thr = ecore_thread_feedback_run(th_do, th_feedback, th_end, th_cancel,
NULL, EINA_TRUE);
evas_object_resize(win, 400, 400);
evas_object_show(win);
elm_run();
if (thr) ecore_thread_cancel(thr);
return 0;
}
ELM_MAIN()
EVAS_CALLBACK_MOUSE_DOWN
@ EVAS_CALLBACK_MOUSE_DOWN
Mouse Button Down Event.
Definition: Evas_Common.h:422
Ecore_Thread
struct _Ecore_Thread Ecore_Thread
A handle for threaded jobs.
Definition: Ecore_Common.h:1729
ecore_thread_feedback_run
Ecore_Thread * ecore_thread_feedback_run(Ecore_Thread_Cb func_heavy, Ecore_Thread_Notify_Cb func_notify, Ecore_Thread_Cb func_end, Ecore_Thread_Cb func_cancel, const void *data, Eina_Bool try_no_queue)
Launches a thread to run a task that can talk back to the main thread.
Definition: ecore_thread.c:911
ecore_thread_check
Eina_Bool ecore_thread_check(Ecore_Thread *thread)
Checks if a thread is pending cancellation.
Definition: ecore_thread.c:892
ecore_thread_feedback
Eina_Bool ecore_thread_feedback(Ecore_Thread *thread, const void *msg_data)
Sends data from the worker thread to the main loop.
Definition: ecore_thread.c:1037
ecore_thread_cancel
Eina_Bool ecore_thread_cancel(Ecore_Thread *thread)
Cancels a running thread.
Definition: ecore_thread.c:741
EINA_TRUE
#define EINA_TRUE
boolean value TRUE (numerical value 1)
Definition: eina_types.h:539
EINA_UNUSED
#define EINA_UNUSED
Used to indicate that a function parameter is purposely unused.
Definition: eina_types.h:339
ELM_MAIN
#define ELM_MAIN()
macro to be used after the elm_main() function
Definition: elm_general.h:556
elm_policy_set
Eina_Bool elm_policy_set(unsigned int policy, int value)
Set a new policy's value (for a given policy group/identifier).
Definition: elm_main.c:1380
elm_exit
void elm_exit(void)
Ask to exit Elementary's main loop.
Definition: elm_main.c:1373
elm_run
void elm_run(void)
Run Elementary's main loop.
Definition: elm_main.c:1357
ELM_POLICY_QUIT_LAST_WINDOW_CLOSED
@ ELM_POLICY_QUIT_LAST_WINDOW_CLOSED
quit when the application's last window is closed
Definition: elm_general.h:248
ELM_POLICY_QUIT
@ ELM_POLICY_QUIT
under which circumstances the application should quit automatically.
Definition: elm_general.h:227
elm_win_util_standard_add
Evas_Object * elm_win_util_standard_add(const char *name, const char *title)
Adds a window object with standard setup.
Definition: efl_ui_win.c:9576
Evas
Eo Evas
An opaque handle to an Evas canvas.
Definition: Evas_Common.h:163
evas_object_show
EVAS_API void evas_object_show(Evas_Object *eo_obj)
Makes the given Evas object visible.
Definition: evas_object_main.c:1814
evas_object_del
EVAS_API void evas_object_del(Evas_Object *obj)
Marks the given Evas object for deletion (when Evas will free its memory).
Definition: evas_object_main.c:928
evas_object_color_set
EVAS_API void evas_object_color_set(Evas_Object *obj, int r, int g, int b, int a)
Sets the general/main color of the given Evas object to the given one.
Definition: evas_object_main.c:2024
evas_object_event_callback_add
EVAS_API void evas_object_event_callback_add(Evas_Object *eo_obj, Evas_Callback_Type type, Evas_Object_Event_Cb func, const void *data)
Add (register) a callback function to a given Evas object event.
Definition: evas_callbacks.c:478
evas_object_move
EVAS_API void evas_object_move(Evas_Object *obj, Evas_Coord x, Evas_Coord y)
Move the given Evas object to the given location inside its canvas' viewport.
Definition: evas_object_main.c:1171
Evas_Object
Efl_Canvas_Object Evas_Object
An Evas Object handle.
Definition: Evas_Common.h:185
evas_object_resize
EVAS_API void evas_object_resize(Evas_Object *obj, Evas_Coord w, Evas_Coord h)
Changes the size of the given Evas object.
Definition: evas_object_main.c:1236
evas_object_evas_get
EVAS_API Evas * evas_object_evas_get(const Eo *eo_obj)
Get the Evas to which this object belongs to.
Definition: evas_object_main.c:2662
evas_object_rectangle_add
EVAS_API Evas_Object * evas_object_rectangle_add(Evas *e)
Adds a rectangle to the given evas.
Definition: evas_object_rectangle.c:78
evas_object_smart_callback_add
EVAS_API void evas_object_smart_callback_add(Evas_Object *eo_obj, const char *event, Evas_Smart_Cb func, const void *data)
Add (register) a callback function to the smart event specified by event on the smart object obj.
Definition: evas_object_smart.c:1040