TCG: improve optimizer debugging
[qemu.git] / qemu-coroutine-lock.c
bloba80f437c595b7132544323fa8f664d648d54981e
1 /*
2 * coroutine queues and locks
4 * Copyright (c) 2011 Kevin Wolf <kwolf@redhat.com>
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
25 #include "qemu-common.h"
26 #include "qemu-coroutine.h"
27 #include "qemu-coroutine-int.h"
28 #include "qemu-queue.h"
29 #include "trace.h"
31 static QTAILQ_HEAD(, Coroutine) unlock_bh_queue =
32 QTAILQ_HEAD_INITIALIZER(unlock_bh_queue);
33 static QEMUBH* unlock_bh;
35 static void qemu_co_queue_next_bh(void *opaque)
37 Coroutine *next;
39 trace_qemu_co_queue_next_bh();
40 while ((next = QTAILQ_FIRST(&unlock_bh_queue))) {
41 QTAILQ_REMOVE(&unlock_bh_queue, next, co_queue_next);
42 qemu_coroutine_enter(next, NULL);
46 void qemu_co_queue_init(CoQueue *queue)
48 QTAILQ_INIT(&queue->entries);
50 if (!unlock_bh) {
51 unlock_bh = qemu_bh_new(qemu_co_queue_next_bh, NULL);
55 void coroutine_fn qemu_co_queue_wait(CoQueue *queue)
57 Coroutine *self = qemu_coroutine_self();
58 QTAILQ_INSERT_TAIL(&queue->entries, self, co_queue_next);
59 qemu_coroutine_yield();
60 assert(qemu_in_coroutine());
63 bool qemu_co_queue_next(CoQueue *queue)
65 Coroutine *next;
67 next = QTAILQ_FIRST(&queue->entries);
68 if (next) {
69 QTAILQ_REMOVE(&queue->entries, next, co_queue_next);
70 QTAILQ_INSERT_TAIL(&unlock_bh_queue, next, co_queue_next);
71 trace_qemu_co_queue_next(next);
72 qemu_bh_schedule(unlock_bh);
75 return (next != NULL);
78 bool qemu_co_queue_empty(CoQueue *queue)
80 return (QTAILQ_FIRST(&queue->entries) == NULL);
83 void qemu_co_mutex_init(CoMutex *mutex)
85 memset(mutex, 0, sizeof(*mutex));
86 qemu_co_queue_init(&mutex->queue);
89 void coroutine_fn qemu_co_mutex_lock(CoMutex *mutex)
91 Coroutine *self = qemu_coroutine_self();
93 trace_qemu_co_mutex_lock_entry(mutex, self);
95 while (mutex->locked) {
96 qemu_co_queue_wait(&mutex->queue);
99 mutex->locked = true;
101 trace_qemu_co_mutex_lock_return(mutex, self);
104 void coroutine_fn qemu_co_mutex_unlock(CoMutex *mutex)
106 Coroutine *self = qemu_coroutine_self();
108 trace_qemu_co_mutex_unlock_entry(mutex, self);
110 assert(mutex->locked == true);
111 assert(qemu_in_coroutine());
113 mutex->locked = false;
114 qemu_co_queue_next(&mutex->queue);
116 trace_qemu_co_mutex_unlock_return(mutex, self);