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coroutine: add co_sleep_ns() coroutine sleep function
[lisovros/qemu_apohw.git] / 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
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_free_timer(sleep_cb->ts);
27     qemu_coroutine_enter(sleep_cb->co, NULL);
28 }
29
30 void coroutine_fn co_sleep_ns(QEMUClock *clock, int64_t ns)
31 {
32     CoSleepCB sleep_cb = {
33         .co = qemu_coroutine_self(),
34     };
35     sleep_cb.ts = qemu_new_timer(clock, SCALE_NS, co_sleep_cb, &sleep_cb);
36     qemu_mod_timer(sleep_cb.ts, qemu_get_clock_ns(clock) + ns);
37     qemu_coroutine_yield();
38 }