mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Kevin Wolf](/assets/img/avatar_default.png)
Add a function that can be used to move the currently running coroutine to a different AioContext (and therefore potentially a different thread). Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20201005155855.256490-12-kwolf@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
652 lines
16 KiB
C
652 lines
16 KiB
C
/*
|
|
* Data plane event loop
|
|
*
|
|
* Copyright (c) 2003-2008 Fabrice Bellard
|
|
* Copyright (c) 2009-2017 QEMU contributors
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "block/aio.h"
|
|
#include "block/thread-pool.h"
|
|
#include "qemu/main-loop.h"
|
|
#include "qemu/atomic.h"
|
|
#include "qemu/rcu_queue.h"
|
|
#include "block/raw-aio.h"
|
|
#include "qemu/coroutine_int.h"
|
|
#include "trace.h"
|
|
|
|
/***********************************************************/
|
|
/* bottom halves (can be seen as timers which expire ASAP) */
|
|
|
|
/* QEMUBH::flags values */
|
|
enum {
|
|
/* Already enqueued and waiting for aio_bh_poll() */
|
|
BH_PENDING = (1 << 0),
|
|
|
|
/* Invoke the callback */
|
|
BH_SCHEDULED = (1 << 1),
|
|
|
|
/* Delete without invoking callback */
|
|
BH_DELETED = (1 << 2),
|
|
|
|
/* Delete after invoking callback */
|
|
BH_ONESHOT = (1 << 3),
|
|
|
|
/* Schedule periodically when the event loop is idle */
|
|
BH_IDLE = (1 << 4),
|
|
};
|
|
|
|
struct QEMUBH {
|
|
AioContext *ctx;
|
|
QEMUBHFunc *cb;
|
|
void *opaque;
|
|
QSLIST_ENTRY(QEMUBH) next;
|
|
unsigned flags;
|
|
};
|
|
|
|
/* Called concurrently from any thread */
|
|
static void aio_bh_enqueue(QEMUBH *bh, unsigned new_flags)
|
|
{
|
|
AioContext *ctx = bh->ctx;
|
|
unsigned old_flags;
|
|
|
|
/*
|
|
* The memory barrier implicit in qatomic_fetch_or makes sure that:
|
|
* 1. idle & any writes needed by the callback are done before the
|
|
* locations are read in the aio_bh_poll.
|
|
* 2. ctx is loaded before the callback has a chance to execute and bh
|
|
* could be freed.
|
|
*/
|
|
old_flags = qatomic_fetch_or(&bh->flags, BH_PENDING | new_flags);
|
|
if (!(old_flags & BH_PENDING)) {
|
|
QSLIST_INSERT_HEAD_ATOMIC(&ctx->bh_list, bh, next);
|
|
}
|
|
|
|
aio_notify(ctx);
|
|
}
|
|
|
|
/* Only called from aio_bh_poll() and aio_ctx_finalize() */
|
|
static QEMUBH *aio_bh_dequeue(BHList *head, unsigned *flags)
|
|
{
|
|
QEMUBH *bh = QSLIST_FIRST_RCU(head);
|
|
|
|
if (!bh) {
|
|
return NULL;
|
|
}
|
|
|
|
QSLIST_REMOVE_HEAD(head, next);
|
|
|
|
/*
|
|
* The qatomic_and is paired with aio_bh_enqueue(). The implicit memory
|
|
* barrier ensures that the callback sees all writes done by the scheduling
|
|
* thread. It also ensures that the scheduling thread sees the cleared
|
|
* flag before bh->cb has run, and thus will call aio_notify again if
|
|
* necessary.
|
|
*/
|
|
*flags = qatomic_fetch_and(&bh->flags,
|
|
~(BH_PENDING | BH_SCHEDULED | BH_IDLE));
|
|
return bh;
|
|
}
|
|
|
|
void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
|
|
{
|
|
QEMUBH *bh;
|
|
bh = g_new(QEMUBH, 1);
|
|
*bh = (QEMUBH){
|
|
.ctx = ctx,
|
|
.cb = cb,
|
|
.opaque = opaque,
|
|
};
|
|
aio_bh_enqueue(bh, BH_SCHEDULED | BH_ONESHOT);
|
|
}
|
|
|
|
QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
|
|
{
|
|
QEMUBH *bh;
|
|
bh = g_new(QEMUBH, 1);
|
|
*bh = (QEMUBH){
|
|
.ctx = ctx,
|
|
.cb = cb,
|
|
.opaque = opaque,
|
|
};
|
|
return bh;
|
|
}
|
|
|
|
void aio_bh_call(QEMUBH *bh)
|
|
{
|
|
bh->cb(bh->opaque);
|
|
}
|
|
|
|
/* Multiple occurrences of aio_bh_poll cannot be called concurrently. */
|
|
int aio_bh_poll(AioContext *ctx)
|
|
{
|
|
BHListSlice slice;
|
|
BHListSlice *s;
|
|
int ret = 0;
|
|
|
|
QSLIST_MOVE_ATOMIC(&slice.bh_list, &ctx->bh_list);
|
|
QSIMPLEQ_INSERT_TAIL(&ctx->bh_slice_list, &slice, next);
|
|
|
|
while ((s = QSIMPLEQ_FIRST(&ctx->bh_slice_list))) {
|
|
QEMUBH *bh;
|
|
unsigned flags;
|
|
|
|
bh = aio_bh_dequeue(&s->bh_list, &flags);
|
|
if (!bh) {
|
|
QSIMPLEQ_REMOVE_HEAD(&ctx->bh_slice_list, next);
|
|
continue;
|
|
}
|
|
|
|
if ((flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
|
|
/* Idle BHs don't count as progress */
|
|
if (!(flags & BH_IDLE)) {
|
|
ret = 1;
|
|
}
|
|
aio_bh_call(bh);
|
|
}
|
|
if (flags & (BH_DELETED | BH_ONESHOT)) {
|
|
g_free(bh);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void qemu_bh_schedule_idle(QEMUBH *bh)
|
|
{
|
|
aio_bh_enqueue(bh, BH_SCHEDULED | BH_IDLE);
|
|
}
|
|
|
|
void qemu_bh_schedule(QEMUBH *bh)
|
|
{
|
|
aio_bh_enqueue(bh, BH_SCHEDULED);
|
|
}
|
|
|
|
/* This func is async.
|
|
*/
|
|
void qemu_bh_cancel(QEMUBH *bh)
|
|
{
|
|
qatomic_and(&bh->flags, ~BH_SCHEDULED);
|
|
}
|
|
|
|
/* This func is async.The bottom half will do the delete action at the finial
|
|
* end.
|
|
*/
|
|
void qemu_bh_delete(QEMUBH *bh)
|
|
{
|
|
aio_bh_enqueue(bh, BH_DELETED);
|
|
}
|
|
|
|
static int64_t aio_compute_bh_timeout(BHList *head, int timeout)
|
|
{
|
|
QEMUBH *bh;
|
|
|
|
QSLIST_FOREACH_RCU(bh, head, next) {
|
|
if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
|
|
if (bh->flags & BH_IDLE) {
|
|
/* idle bottom halves will be polled at least
|
|
* every 10ms */
|
|
timeout = 10000000;
|
|
} else {
|
|
/* non-idle bottom halves will be executed
|
|
* immediately */
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return timeout;
|
|
}
|
|
|
|
int64_t
|
|
aio_compute_timeout(AioContext *ctx)
|
|
{
|
|
BHListSlice *s;
|
|
int64_t deadline;
|
|
int timeout = -1;
|
|
|
|
timeout = aio_compute_bh_timeout(&ctx->bh_list, timeout);
|
|
if (timeout == 0) {
|
|
return 0;
|
|
}
|
|
|
|
QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) {
|
|
timeout = aio_compute_bh_timeout(&s->bh_list, timeout);
|
|
if (timeout == 0) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
deadline = timerlistgroup_deadline_ns(&ctx->tlg);
|
|
if (deadline == 0) {
|
|
return 0;
|
|
} else {
|
|
return qemu_soonest_timeout(timeout, deadline);
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
aio_ctx_prepare(GSource *source, gint *timeout)
|
|
{
|
|
AioContext *ctx = (AioContext *) source;
|
|
|
|
qatomic_set(&ctx->notify_me, qatomic_read(&ctx->notify_me) | 1);
|
|
|
|
/*
|
|
* Write ctx->notify_me before computing the timeout
|
|
* (reading bottom half flags, etc.). Pairs with
|
|
* smp_mb in aio_notify().
|
|
*/
|
|
smp_mb();
|
|
|
|
/* We assume there is no timeout already supplied */
|
|
*timeout = qemu_timeout_ns_to_ms(aio_compute_timeout(ctx));
|
|
|
|
if (aio_prepare(ctx)) {
|
|
*timeout = 0;
|
|
}
|
|
|
|
return *timeout == 0;
|
|
}
|
|
|
|
static gboolean
|
|
aio_ctx_check(GSource *source)
|
|
{
|
|
AioContext *ctx = (AioContext *) source;
|
|
QEMUBH *bh;
|
|
BHListSlice *s;
|
|
|
|
/* Finish computing the timeout before clearing the flag. */
|
|
qatomic_store_release(&ctx->notify_me, qatomic_read(&ctx->notify_me) & ~1);
|
|
aio_notify_accept(ctx);
|
|
|
|
QSLIST_FOREACH_RCU(bh, &ctx->bh_list, next) {
|
|
if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) {
|
|
QSLIST_FOREACH_RCU(bh, &s->bh_list, next) {
|
|
if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return aio_pending(ctx) || (timerlistgroup_deadline_ns(&ctx->tlg) == 0);
|
|
}
|
|
|
|
static gboolean
|
|
aio_ctx_dispatch(GSource *source,
|
|
GSourceFunc callback,
|
|
gpointer user_data)
|
|
{
|
|
AioContext *ctx = (AioContext *) source;
|
|
|
|
assert(callback == NULL);
|
|
aio_dispatch(ctx);
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
aio_ctx_finalize(GSource *source)
|
|
{
|
|
AioContext *ctx = (AioContext *) source;
|
|
QEMUBH *bh;
|
|
unsigned flags;
|
|
|
|
thread_pool_free(ctx->thread_pool);
|
|
|
|
#ifdef CONFIG_LINUX_AIO
|
|
if (ctx->linux_aio) {
|
|
laio_detach_aio_context(ctx->linux_aio, ctx);
|
|
laio_cleanup(ctx->linux_aio);
|
|
ctx->linux_aio = NULL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LINUX_IO_URING
|
|
if (ctx->linux_io_uring) {
|
|
luring_detach_aio_context(ctx->linux_io_uring, ctx);
|
|
luring_cleanup(ctx->linux_io_uring);
|
|
ctx->linux_io_uring = NULL;
|
|
}
|
|
#endif
|
|
|
|
assert(QSLIST_EMPTY(&ctx->scheduled_coroutines));
|
|
qemu_bh_delete(ctx->co_schedule_bh);
|
|
|
|
/* There must be no aio_bh_poll() calls going on */
|
|
assert(QSIMPLEQ_EMPTY(&ctx->bh_slice_list));
|
|
|
|
while ((bh = aio_bh_dequeue(&ctx->bh_list, &flags))) {
|
|
/* qemu_bh_delete() must have been called on BHs in this AioContext */
|
|
assert(flags & BH_DELETED);
|
|
|
|
g_free(bh);
|
|
}
|
|
|
|
aio_set_event_notifier(ctx, &ctx->notifier, false, NULL, NULL);
|
|
event_notifier_cleanup(&ctx->notifier);
|
|
qemu_rec_mutex_destroy(&ctx->lock);
|
|
qemu_lockcnt_destroy(&ctx->list_lock);
|
|
timerlistgroup_deinit(&ctx->tlg);
|
|
aio_context_destroy(ctx);
|
|
}
|
|
|
|
static GSourceFuncs aio_source_funcs = {
|
|
aio_ctx_prepare,
|
|
aio_ctx_check,
|
|
aio_ctx_dispatch,
|
|
aio_ctx_finalize
|
|
};
|
|
|
|
GSource *aio_get_g_source(AioContext *ctx)
|
|
{
|
|
aio_context_use_g_source(ctx);
|
|
g_source_ref(&ctx->source);
|
|
return &ctx->source;
|
|
}
|
|
|
|
ThreadPool *aio_get_thread_pool(AioContext *ctx)
|
|
{
|
|
if (!ctx->thread_pool) {
|
|
ctx->thread_pool = thread_pool_new(ctx);
|
|
}
|
|
return ctx->thread_pool;
|
|
}
|
|
|
|
#ifdef CONFIG_LINUX_AIO
|
|
LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp)
|
|
{
|
|
if (!ctx->linux_aio) {
|
|
ctx->linux_aio = laio_init(errp);
|
|
if (ctx->linux_aio) {
|
|
laio_attach_aio_context(ctx->linux_aio, ctx);
|
|
}
|
|
}
|
|
return ctx->linux_aio;
|
|
}
|
|
|
|
LinuxAioState *aio_get_linux_aio(AioContext *ctx)
|
|
{
|
|
assert(ctx->linux_aio);
|
|
return ctx->linux_aio;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LINUX_IO_URING
|
|
LuringState *aio_setup_linux_io_uring(AioContext *ctx, Error **errp)
|
|
{
|
|
if (ctx->linux_io_uring) {
|
|
return ctx->linux_io_uring;
|
|
}
|
|
|
|
ctx->linux_io_uring = luring_init(errp);
|
|
if (!ctx->linux_io_uring) {
|
|
return NULL;
|
|
}
|
|
|
|
luring_attach_aio_context(ctx->linux_io_uring, ctx);
|
|
return ctx->linux_io_uring;
|
|
}
|
|
|
|
LuringState *aio_get_linux_io_uring(AioContext *ctx)
|
|
{
|
|
assert(ctx->linux_io_uring);
|
|
return ctx->linux_io_uring;
|
|
}
|
|
#endif
|
|
|
|
void aio_notify(AioContext *ctx)
|
|
{
|
|
/*
|
|
* Write e.g. bh->flags before writing ctx->notified. Pairs with smp_mb in
|
|
* aio_notify_accept.
|
|
*/
|
|
smp_wmb();
|
|
qatomic_set(&ctx->notified, true);
|
|
|
|
/*
|
|
* Write ctx->notified before reading ctx->notify_me. Pairs
|
|
* with smp_mb in aio_ctx_prepare or aio_poll.
|
|
*/
|
|
smp_mb();
|
|
if (qatomic_read(&ctx->notify_me)) {
|
|
event_notifier_set(&ctx->notifier);
|
|
}
|
|
}
|
|
|
|
void aio_notify_accept(AioContext *ctx)
|
|
{
|
|
qatomic_set(&ctx->notified, false);
|
|
|
|
/*
|
|
* Write ctx->notified before reading e.g. bh->flags. Pairs with smp_wmb
|
|
* in aio_notify.
|
|
*/
|
|
smp_mb();
|
|
}
|
|
|
|
static void aio_timerlist_notify(void *opaque, QEMUClockType type)
|
|
{
|
|
aio_notify(opaque);
|
|
}
|
|
|
|
static void aio_context_notifier_cb(EventNotifier *e)
|
|
{
|
|
AioContext *ctx = container_of(e, AioContext, notifier);
|
|
|
|
event_notifier_test_and_clear(&ctx->notifier);
|
|
}
|
|
|
|
/* Returns true if aio_notify() was called (e.g. a BH was scheduled) */
|
|
static bool aio_context_notifier_poll(void *opaque)
|
|
{
|
|
EventNotifier *e = opaque;
|
|
AioContext *ctx = container_of(e, AioContext, notifier);
|
|
|
|
return qatomic_read(&ctx->notified);
|
|
}
|
|
|
|
static void co_schedule_bh_cb(void *opaque)
|
|
{
|
|
AioContext *ctx = opaque;
|
|
QSLIST_HEAD(, Coroutine) straight, reversed;
|
|
|
|
QSLIST_MOVE_ATOMIC(&reversed, &ctx->scheduled_coroutines);
|
|
QSLIST_INIT(&straight);
|
|
|
|
while (!QSLIST_EMPTY(&reversed)) {
|
|
Coroutine *co = QSLIST_FIRST(&reversed);
|
|
QSLIST_REMOVE_HEAD(&reversed, co_scheduled_next);
|
|
QSLIST_INSERT_HEAD(&straight, co, co_scheduled_next);
|
|
}
|
|
|
|
while (!QSLIST_EMPTY(&straight)) {
|
|
Coroutine *co = QSLIST_FIRST(&straight);
|
|
QSLIST_REMOVE_HEAD(&straight, co_scheduled_next);
|
|
trace_aio_co_schedule_bh_cb(ctx, co);
|
|
aio_context_acquire(ctx);
|
|
|
|
/* Protected by write barrier in qemu_aio_coroutine_enter */
|
|
qatomic_set(&co->scheduled, NULL);
|
|
qemu_aio_coroutine_enter(ctx, co);
|
|
aio_context_release(ctx);
|
|
}
|
|
}
|
|
|
|
AioContext *aio_context_new(Error **errp)
|
|
{
|
|
int ret;
|
|
AioContext *ctx;
|
|
|
|
ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext));
|
|
QSLIST_INIT(&ctx->bh_list);
|
|
QSIMPLEQ_INIT(&ctx->bh_slice_list);
|
|
aio_context_setup(ctx);
|
|
|
|
ret = event_notifier_init(&ctx->notifier, false);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "Failed to initialize event notifier");
|
|
goto fail;
|
|
}
|
|
g_source_set_can_recurse(&ctx->source, true);
|
|
qemu_lockcnt_init(&ctx->list_lock);
|
|
|
|
ctx->co_schedule_bh = aio_bh_new(ctx, co_schedule_bh_cb, ctx);
|
|
QSLIST_INIT(&ctx->scheduled_coroutines);
|
|
|
|
aio_set_event_notifier(ctx, &ctx->notifier,
|
|
false,
|
|
aio_context_notifier_cb,
|
|
aio_context_notifier_poll);
|
|
#ifdef CONFIG_LINUX_AIO
|
|
ctx->linux_aio = NULL;
|
|
#endif
|
|
|
|
#ifdef CONFIG_LINUX_IO_URING
|
|
ctx->linux_io_uring = NULL;
|
|
#endif
|
|
|
|
ctx->thread_pool = NULL;
|
|
qemu_rec_mutex_init(&ctx->lock);
|
|
timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx);
|
|
|
|
ctx->poll_ns = 0;
|
|
ctx->poll_max_ns = 0;
|
|
ctx->poll_grow = 0;
|
|
ctx->poll_shrink = 0;
|
|
|
|
return ctx;
|
|
fail:
|
|
g_source_destroy(&ctx->source);
|
|
return NULL;
|
|
}
|
|
|
|
void aio_co_schedule(AioContext *ctx, Coroutine *co)
|
|
{
|
|
trace_aio_co_schedule(ctx, co);
|
|
const char *scheduled = qatomic_cmpxchg(&co->scheduled, NULL,
|
|
__func__);
|
|
|
|
if (scheduled) {
|
|
fprintf(stderr,
|
|
"%s: Co-routine was already scheduled in '%s'\n",
|
|
__func__, scheduled);
|
|
abort();
|
|
}
|
|
|
|
/* The coroutine might run and release the last ctx reference before we
|
|
* invoke qemu_bh_schedule(). Take a reference to keep ctx alive until
|
|
* we're done.
|
|
*/
|
|
aio_context_ref(ctx);
|
|
|
|
QSLIST_INSERT_HEAD_ATOMIC(&ctx->scheduled_coroutines,
|
|
co, co_scheduled_next);
|
|
qemu_bh_schedule(ctx->co_schedule_bh);
|
|
|
|
aio_context_unref(ctx);
|
|
}
|
|
|
|
typedef struct AioCoRescheduleSelf {
|
|
Coroutine *co;
|
|
AioContext *new_ctx;
|
|
} AioCoRescheduleSelf;
|
|
|
|
static void aio_co_reschedule_self_bh(void *opaque)
|
|
{
|
|
AioCoRescheduleSelf *data = opaque;
|
|
aio_co_schedule(data->new_ctx, data->co);
|
|
}
|
|
|
|
void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx)
|
|
{
|
|
AioContext *old_ctx = qemu_get_current_aio_context();
|
|
|
|
if (old_ctx != new_ctx) {
|
|
AioCoRescheduleSelf data = {
|
|
.co = qemu_coroutine_self(),
|
|
.new_ctx = new_ctx,
|
|
};
|
|
/*
|
|
* We can't directly schedule the coroutine in the target context
|
|
* because this would be racy: The other thread could try to enter the
|
|
* coroutine before it has yielded in this one.
|
|
*/
|
|
aio_bh_schedule_oneshot(old_ctx, aio_co_reschedule_self_bh, &data);
|
|
qemu_coroutine_yield();
|
|
}
|
|
}
|
|
|
|
void aio_co_wake(struct Coroutine *co)
|
|
{
|
|
AioContext *ctx;
|
|
|
|
/* Read coroutine before co->ctx. Matches smp_wmb in
|
|
* qemu_coroutine_enter.
|
|
*/
|
|
smp_read_barrier_depends();
|
|
ctx = qatomic_read(&co->ctx);
|
|
|
|
aio_co_enter(ctx, co);
|
|
}
|
|
|
|
void aio_co_enter(AioContext *ctx, struct Coroutine *co)
|
|
{
|
|
if (ctx != qemu_get_current_aio_context()) {
|
|
aio_co_schedule(ctx, co);
|
|
return;
|
|
}
|
|
|
|
if (qemu_in_coroutine()) {
|
|
Coroutine *self = qemu_coroutine_self();
|
|
assert(self != co);
|
|
QSIMPLEQ_INSERT_TAIL(&self->co_queue_wakeup, co, co_queue_next);
|
|
} else {
|
|
aio_context_acquire(ctx);
|
|
qemu_aio_coroutine_enter(ctx, co);
|
|
aio_context_release(ctx);
|
|
}
|
|
}
|
|
|
|
void aio_context_ref(AioContext *ctx)
|
|
{
|
|
g_source_ref(&ctx->source);
|
|
}
|
|
|
|
void aio_context_unref(AioContext *ctx)
|
|
{
|
|
g_source_unref(&ctx->source);
|
|
}
|
|
|
|
void aio_context_acquire(AioContext *ctx)
|
|
{
|
|
qemu_rec_mutex_lock(&ctx->lock);
|
|
}
|
|
|
|
void aio_context_release(AioContext *ctx)
|
|
{
|
|
qemu_rec_mutex_unlock(&ctx->lock);
|
|
}
|