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Setupcallbacks

 
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jojojoris



Joined: 30 Mar 2008
Posts: 261
PostPosted: Sat Aug 23, 2008 6:10 pm    Post subject: Setupcallbacks Reply with quote
Hello,

I'm a c/c++ beginner and i have a question about the SetupCallbacks();?

What does it exactly? A program without that code runs fine too.

Code:
/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
   sceKernelExitGame();
    return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
   int cbid;

    cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
    sceKernelRegisterExitCallback(cbid);

    sceKernelSleepThreadCB();

    return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
    int thid = 0;

    thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
    if(thid >= 0) {
      sceKernelStartThread(thid, 0, 0);
      }

    return thid;
}
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Raphael



Joined: 17 Jan 2006
Posts: 646
Location: Germany
PostPosted: Sat Aug 23, 2008 6:24 pm    Post subject: Reply with quote
Ever seen the screen that pops up when you press the HOME button from ingame? That's what makes that screen appear.
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jean



Joined: 05 Jan 2008
Posts: 489
PostPosted: Sat Aug 23, 2008 6:30 pm    Post subject: Reply with quote
basically it is creating a thread whose function is only to register the exit callback....this means: its function is to make your app correctly react to the [home] button press. Just an advice: don't call sceKernelExitGame(); in exit callback: better setting a flag (e.g. "exitRequested=1") that other loops in your application should check against. Like

Code:
int exitRequested;

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common) {
   exitRequested = 1;
   return 0;
}

/* Callback thread */
int CallbackThread(SceSize args, void *argp) {
 
    exitRequested = 0;

    int cbid;

    cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
    sceKernelRegisterExitCallback(cbid);

    sceKernelSleepThreadCB();

    return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
    int thid = 0;

    thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
    if(thid >= 0) {
      sceKernelStartThread(thid, 0, 0);
      }

    return thid;
}
.
.
.
// main loop
while (!exitRequested)
{
...do your stuff here
}
sceKernelExitGame(); // finally exit here
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