AIO!!
From: Karthik Sarangan
Date: Mon Oct 10 2005 - 08:48:14 EST
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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