LXR qemu/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 "block/coroutine.h"
  15#include "qemu/timer.h"
  16
  17typedef struct CoSleepCB {
  18    QEMUTimer *ts;
  19    Coroutine *co;
  20} CoSleepCB;
  21
  22static void co_sleep_cb(void *opaque)
  23{
  24    CoSleepCB *sleep_cb = opaque;
  25
  26    qemu_coroutine_enter(sleep_cb->co, NULL);
  27}
  28
  29void coroutine_fn co_sleep_ns(QEMUClock *clock, int64_t ns)
  30{
  31    CoSleepCB sleep_cb = {
  32        .co = qemu_coroutine_self(),
  33    };
  34    sleep_cb.ts = qemu_new_timer(clock, SCALE_NS, co_sleep_cb, &sleep_cb);
  35    qemu_mod_timer(sleep_cb.ts, qemu_get_clock_ns(clock) + ns);
  36    qemu_coroutine_yield();
  37    qemu_del_timer(sleep_cb.ts);
  38    qemu_free_timer(sleep_cb.ts);
  39}
  40