LXR qemu/util/qemu-coroutine-sleep.c

   1/*
   2 * QEMU coroutine sleep
   3 *
   4 * Copyright IBM, Corp. 2011
   5 *
   6 * Authors:
   7 *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
   8 *
   9 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  10 * See the COPYING.LIB file in the top-level directory.
  11 *
  12 */
  13
  14#include "qemu/osdep.h"
  15#include "qemu/coroutine.h"
  16#include "qemu/timer.h"
  17#include "block/aio.h"
  18
  19typedef struct CoSleepCB {
  20    QEMUTimer *ts;
  21    Coroutine *co;
  22} CoSleepCB;
  23
  24static void co_sleep_cb(void *opaque)
  25{
  26    CoSleepCB *sleep_cb = opaque;
  27
  28    qemu_coroutine_enter(sleep_cb->co, NULL);
  29}
  30
  31void coroutine_fn co_aio_sleep_ns(AioContext *ctx, QEMUClockType type,
  32                                  int64_t ns)
  33{
  34    CoSleepCB sleep_cb = {
  35        .co = qemu_coroutine_self(),
  36    };
  37    sleep_cb.ts = aio_timer_new(ctx, type, SCALE_NS, co_sleep_cb, &sleep_cb);
  38    timer_mod(sleep_cb.ts, qemu_clock_get_ns(type) + ns);
  39    qemu_coroutine_yield();
  40    timer_del(sleep_cb.ts);
  41    timer_free(sleep_cb.ts);
  42}
  43