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
  19 typedef struct CoSleepCB {
  20     QEMUTimer *ts;
  21     Coroutine *co;
  22 } CoSleepCB;
  23
  24 static void co_sleep_cb(void *opaque)
  25 {
  26     CoSleepCB *sleep_cb = opaque;
  27
  28     qemu_coroutine_enter(sleep_cb->co, NULL);
  29 }
  30
  31 void 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 }