posix-aio-compat.h

   1 /*
   2  * QEMU posix-aio emulation
   3  *
   4  * Copyright IBM, Corp. 2008
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #ifndef QEMU_POSIX_AIO_COMPAT_H
  15 #define QEMU_POSIX_AIO_COMPAT_H
  16
  17 #include <sys/types.h>
  18 #include <unistd.h>
  19 #include <signal.h>
  20
  21 #include "sys-queue.h"
  22
  23 #define QEMU_PAIO_CANCELED     0x01
  24 #define QEMU_PAIO_NOTCANCELED  0x02
  25 #define QEMU_PAIO_ALLDONE      0x03
  26
  27 struct qemu_paiocb
  28 {
  29     int aio_fildes;
  30     void *aio_buf;
  31     size_t aio_nbytes;
  32     int ev_signo;
  33     off_t aio_offset;
  34
  35     /* private */
  36     TAILQ_ENTRY(qemu_paiocb) node;
  37     int is_write;
  38     ssize_t ret;
  39     int active;
  40 };
  41
  42 struct qemu_paioinit
  43 {
  44     unsigned int aio_threads;
  45     unsigned int aio_num;
  46     unsigned int aio_idle_time;
  47 };
  48
  49 int qemu_paio_init(struct qemu_paioinit *aioinit);
  50 int qemu_paio_read(struct qemu_paiocb *aiocb);
  51 int qemu_paio_write(struct qemu_paiocb *aiocb);
  52 int qemu_paio_error(struct qemu_paiocb *aiocb);
  53 ssize_t qemu_paio_return(struct qemu_paiocb *aiocb);
  54 int qemu_paio_cancel(int fd, struct qemu_paiocb *aiocb);
  55
  56 #endif