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