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sceIoOpen and sceIoOpenAsync

 
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Noko



Joined: 06 Sep 2008
Posts: 23
PostPosted: Fri Oct 10, 2008 6:31 pm    Post subject: sceIoOpen and sceIoOpenAsync Reply with quote
sceIoOpen and sceIoOpenAsync
Are there real differences? Or can this whole async stuff be emulated using non-async functions?
I'm asking this because apparently psp kernel is not reentrant, and when I call sceIoRead with a lot of bytes to read, syscalls from other threads (like reading psp joystick state) seem to block until reading from file is done. I though that maybe async i/o might be a solution for this.
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[wl]



Joined: 05 May 2006
Posts: 16
PostPosted: Fri Oct 10, 2008 10:24 pm    Post subject: Reply with quote
sceIoOpenAsync should help, because commercial games uses it while decoding/playing audio and video
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Noko



Joined: 06 Sep 2008
Posts: 23
PostPosted: Sat Oct 11, 2008 5:24 am    Post subject: Reply with quote
Did someone here use async file io?

I'm doing something like this:
Code:
   SceUID f;
   SceInt64 asyncres;

   if((f=sceIoOpenAsync(path,PSP_O_RDONLY,0777))<0)
      return NULL;

   sceIoReadAsync(f,buffer,bufsize);
   sceIoWaitAsync(f,&asyncres);


Where to get the amount of bytes read after that? You'd think it would be in asyncres, but asyncres has the same values as f for some reason.
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moonlight



Joined: 26 Oct 2005
Posts: 567
PostPosted: Sat Oct 11, 2008 6:37 am    Post subject: Reply with quote
Noko wrote:
Did someone here use async file io?

I'm doing something like this:
Code:
   SceUID f;
   SceInt64 asyncres;

   if((f=sceIoOpenAsync(path,PSP_O_RDONLY,0777))<0)
      return NULL;

   sceIoReadAsync(f,buffer,bufsize);
       sceIoWaitAsync(f,&asyncres);


Where to get the amount of bytes read after that? You'd think it would be in asyncres, but asyncres has the same values as f for some reason.


Shouldn't you wait also for sceIoOpenAsync completion?
Even if openasync returns success and a valid fd, that doesn't mean it completed the opening.

Code:
   SceUID f;
   SceInt64 asyncres;

   if((f=sceIoOpenAsync(path,PSP_O_RDONLY,0777))<0)
      return NULL;

       sceIoWaitAsync(f, &asyncres);
        if (asyncres < 0)
            return NULL;

        sceIoReadAsync(f,buffer,bufsize);
      sceIoWaitAsync(f,&asyncres);
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