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, 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, Ecore_Thread *th, 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, Ecore_Thread *th) { printf("thread ended\n"); }
// BONUS (optional): called in mainloop AFTER thread has finished cancelling
static void th_cancel(void *data, Ecore_Thread *th) { printf("thread cancelled\n"); }
// just test cancelling the thread worker
static void
down(void *data, Evas *e, Evas_Object *obj, void *event_info)
{
if (thr) ecore_thread_cancel(thr);
thr = NULL;
}
// on window delete - cancel thread then delete window and exit mainloop
static void
del(void *data, Evas_Object *obj, void *event_info)
{
if (thr) ecore_thread_cancel(thr);
thr = NULL;
evas_object_del(obj);
elm_exit();
}
EAPI_MAIN int
elm_main(int argc, char **argv)
{
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()