Message-ID: <434A6EFC.4010100@cdac.in>
Date: Mon, 10 Oct 2005 19:09:08 +0530
From: Karthik Sarangan <karthiks@cdac.in>
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To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: AIO!!
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I wrote a small program to do Async IO from a raw disk
open has no problems.
My program gets stuck up at aio_read(paio);
!!WHY!!

-----------------------------------------------
#define _GNU_SOURCE
#include <aio.h>
#include <unistd.h>
#include <fcntl.h>

#define AIOLEN (256 * 1024)

int main(void)
{
   /* Allocate resources /
   struct aiocb *paio = (struct aiocb *) malloc(sizeof(struct aiocb));
   paio->aio_buf = malloc(AIOLEN);
   paio->aio_fildes = open("/dev/raw/raw1", O_DIRECT | O_RDWR);

   paio->aio_nbytes = AIOLEN;
   paio->aio_reqprio = 0; paio->aio_sigevent.sigev_notify = SIGEV_NONE;

   aio_read(paio);

   /* My program gets stuck here in this loop.  !!WHY!!  */
   while(aio_error(paio))
   {
     sched_yield();
   }

   aio_return(paio);

   /* Return all resources to Linux */
   close(paio->aio_fildes);
   free(paio->aio_buf);
   free(paio);

   return 0;
}
-----------------------------------------------

I also have tried inserting an 'aio_fsync' between 'aio_read' and the 
'while' loop ... to no avail.
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