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/coroutine.h"
  15 #include "qemu/timer.h"
  16 #include "block/aio.h"
  17
  18 typedef struct CoSleepCB {
  19     QEMUTimer *ts;
  20     Coroutine *co;
  21 } CoSleepCB;
  22
  23 static void co_sleep_cb(void *opaque)
  24 {
  25     CoSleepCB *sleep_cb = opaque;
  26
  27     qemu_coroutine_enter(sleep_cb->co, NULL);
  28 }
  29
  30 void coroutine_fn co_aio_sleep_ns(AioContext *ctx, QEMUClockType type,
  31                                   int64_t ns)
  32 {
  33     CoSleepCB sleep_cb = {
  34         .co = qemu_coroutine_self(),
  35     };
  36     sleep_cb.ts = aio_timer_new(ctx, type, SCALE_NS, co_sleep_cb, &sleep_cb);
  37     timer_mod(sleep_cb.ts, qemu_clock_get_ns(type) + ns);
  38     qemu_coroutine_yield();
  39     timer_del(sleep_cb.ts);
  40     timer_free(sleep_cb.ts);
  41 }