struct AioHandler {
EventNotifier *e;
+ IOHandler *io_read;
+ IOHandler *io_write;
EventNotifierHandler *io_notify;
GPollFD pfd;
int deleted;
+ void *opaque;
QLIST_ENTRY(AioHandler) node;
};
+void aio_set_fd_handler(AioContext *ctx,
+ int fd,
+ IOHandler *io_read,
+ IOHandler *io_write,
+ void *opaque)
+{
+ /* fd is a SOCKET in our case */
+ AioHandler *node;
+
+ QLIST_FOREACH(node, &ctx->aio_handlers, node) {
+ if (node->pfd.fd == fd && !node->deleted) {
+ break;
+ }
+ }
+
+ /* Are we deleting the fd handler? */
+ if (!io_read && !io_write) {
+ if (node) {
+ /* If the lock is held, just mark the node as deleted */
+ if (ctx->walking_handlers) {
+ node->deleted = 1;
+ node->pfd.revents = 0;
+ } else {
+ /* Otherwise, delete it for real. We can't just mark it as
+ * deleted because deleted nodes are only cleaned up after
+ * releasing the walking_handlers lock.
+ */
+ QLIST_REMOVE(node, node);
+ g_free(node);
+ }
+ }
+ } else {
+ HANDLE event;
+
+ if (node == NULL) {
+ /* Alloc and insert if it's not already there */
+ node = g_malloc0(sizeof(AioHandler));
+ node->pfd.fd = fd;
+ QLIST_INSERT_HEAD(&ctx->aio_handlers, node, node);
+ }
+
+ node->pfd.events = 0;
+ if (node->io_read) {
+ node->pfd.events |= G_IO_IN;
+ }
+ if (node->io_write) {
+ node->pfd.events |= G_IO_OUT;
+ }
+
+ node->e = &ctx->notifier;
+
+ /* Update handler with latest information */
+ node->opaque = opaque;
+ node->io_read = io_read;
+ node->io_write = io_write;
+
+ event = event_notifier_get_handle(&ctx->notifier);
+ WSAEventSelect(node->pfd.fd, event,
+ FD_READ | FD_ACCEPT | FD_CLOSE |
+ FD_CONNECT | FD_WRITE | FD_OOB);
+ }
+
+ aio_notify(ctx);
+}
+
void aio_set_event_notifier(AioContext *ctx,
EventNotifier *e,
EventNotifierHandler *io_notify)
aio_notify(ctx);
}
+bool aio_prepare(AioContext *ctx)
+{
+ static struct timeval tv0;
+ AioHandler *node;
+ bool have_select_revents = false;
+ fd_set rfds, wfds;
+
+ /* fill fd sets */
+ FD_ZERO(&rfds);
+ FD_ZERO(&wfds);
+ QLIST_FOREACH(node, &ctx->aio_handlers, node) {
+ if (node->io_read) {
+ FD_SET ((SOCKET)node->pfd.fd, &rfds);
+ }
+ if (node->io_write) {
+ FD_SET ((SOCKET)node->pfd.fd, &wfds);
+ }
+ }
+
+ if (select(0, &rfds, &wfds, NULL, &tv0) > 0) {
+ QLIST_FOREACH(node, &ctx->aio_handlers, node) {
+ node->pfd.revents = 0;
+ if (FD_ISSET(node->pfd.fd, &rfds)) {
+ node->pfd.revents |= G_IO_IN;
+ have_select_revents = true;
+ }
+
+ if (FD_ISSET(node->pfd.fd, &wfds)) {
+ node->pfd.revents |= G_IO_OUT;
+ have_select_revents = true;
+ }
+ }
+ }
+
+ return have_select_revents;
+}
+
bool aio_pending(AioContext *ctx)
{
AioHandler *node;
if (node->pfd.revents && node->io_notify) {
return true;
}
+
+ if ((node->pfd.revents & G_IO_IN) && node->io_read) {
+ return true;
+ }
+ if ((node->pfd.revents & G_IO_OUT) && node->io_write) {
+ return true;
+ }
}
return false;
node = QLIST_FIRST(&ctx->aio_handlers);
while (node) {
AioHandler *tmp;
+ int revents = node->pfd.revents;
ctx->walking_handlers++;
if (!node->deleted &&
- (node->pfd.revents || event_notifier_get_handle(node->e) == event) &&
+ (revents || event_notifier_get_handle(node->e) == event) &&
node->io_notify) {
node->pfd.revents = 0;
node->io_notify(node->e);
}
}
+ if (!node->deleted &&
+ (node->io_read || node->io_write)) {
+ node->pfd.revents = 0;
+ if ((revents & G_IO_IN) && node->io_read) {
+ node->io_read(node->opaque);
+ progress = true;
+ }
+ if ((revents & G_IO_OUT) && node->io_write) {
+ node->io_write(node->opaque);
+ progress = true;
+ }
+
+ /* if the next select() will return an event, we have progressed */
+ if (event == event_notifier_get_handle(&ctx->notifier)) {
+ WSANETWORKEVENTS ev;
+ WSAEnumNetworkEvents(node->pfd.fd, event, &ev);
+ if (ev.lNetworkEvents) {
+ progress = true;
+ }
+ }
+ }
+
tmp = node;
node = QLIST_NEXT(node, node);
return progress;
}
-static bool aio_dispatch(AioContext *ctx)
+bool aio_dispatch(AioContext *ctx)
{
bool progress;
- progress = aio_dispatch_handlers(ctx, INVALID_HANDLE_VALUE);
+ progress = aio_bh_poll(ctx);
+ progress |= aio_dispatch_handlers(ctx, INVALID_HANDLE_VALUE);
progress |= timerlistgroup_run_timers(&ctx->tlg);
return progress;
}
{
AioHandler *node;
HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
- bool progress;
+ bool was_dispatching, progress, have_select_revents, first;
int count;
int timeout;
- progress = false;
-
- /*
- * If there are callbacks left that have been queued, we need to call then.
- * Do not call select in this case, because it is possible that the caller
- * does not need a complete flush (as is the case for aio_poll loops).
- */
- if (aio_bh_poll(ctx)) {
+ have_select_revents = aio_prepare(ctx);
+ if (have_select_revents) {
blocking = false;
- progress = true;
}
- /* Dispatch any pending callbacks from the GSource. */
- progress |= aio_dispatch(ctx);
+ was_dispatching = ctx->dispatching;
+ progress = false;
- if (progress && !blocking) {
- return true;
- }
+ /* aio_notify can avoid the expensive event_notifier_set if
+ * everything (file descriptors, bottom halves, timers) will
+ * be re-evaluated before the next blocking poll(). This is
+ * already true when aio_poll is called with blocking == false;
+ * if blocking == true, it is only true after poll() returns.
+ *
+ * If we're in a nested event loop, ctx->dispatching might be true.
+ * In that case we can restore it just before returning, but we
+ * have to clear it now.
+ */
+ aio_set_dispatching(ctx, !blocking);
ctx->walking_handlers++;
}
ctx->walking_handlers--;
+ first = true;
/* wait until next event */
while (count > 0) {
+ HANDLE event;
int ret;
timeout = blocking
? qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)) : 0;
ret = WaitForMultipleObjects(count, events, FALSE, timeout);
+ aio_set_dispatching(ctx, true);
+
+ if (first && aio_bh_poll(ctx)) {
+ progress = true;
+ }
+ first = false;
/* if we have any signaled events, dispatch event */
- if ((DWORD) (ret - WAIT_OBJECT_0) >= count) {
+ event = NULL;
+ if ((DWORD) (ret - WAIT_OBJECT_0) < count) {
+ event = events[ret - WAIT_OBJECT_0];
+ events[ret - WAIT_OBJECT_0] = events[--count];
+ } else if (!have_select_revents) {
break;
}
+ have_select_revents = false;
blocking = false;
- progress |= aio_dispatch_handlers(ctx, events[ret - WAIT_OBJECT_0]);
-
- /* Try again, but only call each handler once. */
- events[ret - WAIT_OBJECT_0] = events[--count];
+ progress |= aio_dispatch_handlers(ctx, event);
}
- if (blocking) {
- /* Run the timers a second time. We do this because otherwise aio_wait
- * will not note progress - and will stop a drain early - if we have
- * a timer that was not ready to run entering g_poll but is ready
- * after g_poll. This will only do anything if a timer has expired.
- */
- progress |= timerlistgroup_run_timers(&ctx->tlg);
- }
+ progress |= timerlistgroup_run_timers(&ctx->tlg);
+ aio_set_dispatching(ctx, was_dispatching);
return progress;
}
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