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| user event ref counting problem |
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Sancha
Member #14,714
November 2012
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Why does my_event_dtor function get called for each call to al_unref_user_event? Surely the event queue should contain 3 events prior to entering the msg pump loop? 1#include <allegro5/allegro.h>
2#include <allegro5/allegro_native_dialog.h>
3
4#define MY_COMPLEX_EVENT_TYPE ALLEGRO_GET_EVENT_TYPE('m', 'c', 'e', 't')
5
6ALLEGRO_EVENT_QUEUE *m_queue;
7ALLEGRO_EVENT_SOURCE m_userSrc;
8ALLEGRO_EVENT m_userEvent;
9ALLEGRO_EVENT event;
10
11int cnt = 0;
12
13static void my_event_dtor(ALLEGRO_USER_EVENT *ev)
14{
15al_show_native_message_box(NULL, NULL, "Event", "MY_COMPLEX_EVENT_TYPE my_event_dtor called", NULL, ALLEGRO_MESSAGEBOX_ERROR);
16}
17
18int main(int argc, char **argv)
19{
20 al_init();
21 al_init_user_event_source(&m_userSrc);
22 m_queue = al_create_event_queue();
23 al_register_event_source(m_queue, &m_userSrc);
24
25 m_userEvent.user.type = MY_COMPLEX_EVENT_TYPE;
26 al_emit_user_event(&m_userSrc, &m_userEvent, my_event_dtor);
27 al_emit_user_event(&m_userSrc, &m_userEvent, my_event_dtor);
28 al_emit_user_event(&m_userSrc, &m_userEvent, my_event_dtor);
29
30 while (true)
31 {
32 al_wait_for_event(m_queue, &event);
33 if (event.type == MY_COMPLEX_EVENT_TYPE)
34 {
35 al_show_native_message_box(NULL, NULL, "Event", "MY_COMPLEX_EVENT_TYPE", NULL, ALLEGRO_MESSAGEBOX_ERROR);
36 al_unref_user_event(&event.user);
37 }
38 }
39 return 0;
40}
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Elias
Member #358
May 2000
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No, al_emit_user_event creates a new event. The reference counting ensures that for each call to al_emit_user_event you get one call of the destructor (once al_unref_user_event has been called on it from all the queues it was sent to). -- |
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Sancha
Member #14,714
November 2012
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Ok, that makes sense. Thanks |
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