GMainLoop에 timer callback 넣기

흐름

1. loop객체와 context객체를 만든다.
2. source 객체를 만들고, context객체에 attach한다.
3. context를 loop에 넣어서 만든 loop를 이용해서 g_main_loop_run실행

코드

#include <glib.h>
#include <stdio.h>

gboolean timeout_callback(gpointer data)
{
    printf("timeout_callback called\n");
    return TRUE;
}

static gboolean on_idle(gpointer user_data)
{
    //App *app = (App*)user_data;
    printf("on_idle called\n");
    //return TRUE;
    GMainLoop* loop = (GMainLoop*)user_data;
    g_main_loop_quit(loop);
    return FALSE;
    // loop를 리턴하면 반복
}

int main(int argc, char* argv[])
{
    GMainLoop* loop = NULL;
    GMainContext* context = NULL;

    // create timeout_source
    GSource* source = NULL;
    source = g_timeout_source_new_seconds(2);


    // create a context 
    context = g_main_context_new();
    printf("create a context\n");
    // attach source to context
    int id = g_source_attach(source, context);
    printf("attach source to context\n");

    GSource* idle_src = g_idle_source_new();
    int idle_id = g_source_attach(idle_src, context);  

    // create main loop
    loop = g_main_loop_new(context, FALSE);
    printf("create main loop\n");

    g_source_set_callback(source, timeout_callback, loop, NULL);
    g_source_set_callback(idle_src, on_idle, loop, NULL);

    printf("set callback\n");

    g_main_loop_run(loop);
    printf("loop run\n");
    g_main_loop_unref(loop);

    return 0;
}

빌드 명령어

g++ -o mainloop_test mainloop_test.cpp `pkg-config --cflags --libs glib-2.0`