* GNU GPL, version 2 or (at your option) any later version.
*/
+#include "qemu/osdep.h"
#include "qemu-common.h"
#include "block/block.h"
#include "qemu/queue.h"
struct AioHandler {
EventNotifier *e;
+ IOHandler *io_read;
+ IOHandler *io_write;
EventNotifierHandler *io_notify;
GPollFD pfd;
int deleted;
+ void *opaque;
+ bool is_external;
QLIST_ENTRY(AioHandler) node;
};
+void aio_set_fd_handler(AioContext *ctx,
+ int fd,
+ bool is_external,
+ 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_new0(AioHandler, 1);
+ 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;
+ node->is_external = is_external;
+
+ 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,
+ bool is_external,
EventNotifierHandler *io_notify)
{
AioHandler *node;
} else {
if (node == NULL) {
/* Alloc and insert if it's not already there */
- node = g_malloc0(sizeof(AioHandler));
+ node = g_new0(AioHandler, 1);
node->e = e;
node->pfd.fd = (uintptr_t)event_notifier_get_handle(e);
node->pfd.events = G_IO_IN;
+ node->is_external = is_external;
QLIST_INSERT_HEAD(&ctx->aio_handlers, node, node);
g_source_add_poll(&ctx->source, &node->pfd);
bool aio_prepare(AioContext *ctx)
{
- return false;
+ 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)
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);
{
AioHandler *node;
HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
- bool was_dispatching, progress, first;
+ bool progress, have_select_revents, first;
int count;
int timeout;
- was_dispatching = ctx->dispatching;
+ aio_context_acquire(ctx);
progress = false;
/* 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.
+ * if blocking == true, it is only true after poll() returns,
+ * so disable the optimization now.
*/
- aio_set_dispatching(ctx, !blocking);
+ if (blocking) {
+ atomic_add(&ctx->notify_me, 2);
+ }
+
+ have_select_revents = aio_prepare(ctx);
ctx->walking_handlers++;
/* fill fd sets */
count = 0;
QLIST_FOREACH(node, &ctx->aio_handlers, node) {
- if (!node->deleted && node->io_notify) {
+ if (!node->deleted && node->io_notify
+ && aio_node_check(ctx, node->is_external)) {
events[count++] = event_notifier_get_handle(node->e);
}
}
ctx->walking_handlers--;
first = true;
- /* wait until next event */
- while (count > 0) {
+ /* ctx->notifier is always registered. */
+ assert(count > 0);
+
+ /* Multiple iterations, all of them non-blocking except the first,
+ * may be necessary to process all pending events. After the first
+ * WaitForMultipleObjects call ctx->notify_me will be decremented.
+ */
+ do {
+ HANDLE event;
int ret;
- timeout = blocking
+ timeout = blocking && !have_select_revents
? qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)) : 0;
+ if (timeout) {
+ aio_context_release(ctx);
+ }
ret = WaitForMultipleObjects(count, events, FALSE, timeout);
- aio_set_dispatching(ctx, true);
+ if (blocking) {
+ assert(first);
+ atomic_sub(&ctx->notify_me, 2);
+ }
+ if (timeout) {
+ aio_context_acquire(ctx);
+ }
- if (first && aio_bh_poll(ctx)) {
- progress = true;
+ if (first) {
+ aio_notify_accept(ctx);
+ progress |= aio_bh_poll(ctx);
+ first = false;
}
- 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);
+ } while (count > 0);
progress |= timerlistgroup_run_timers(&ctx->tlg);
- aio_set_dispatching(ctx, was_dispatching);
+ aio_context_release(ctx);
return progress;
}
+
+void aio_context_setup(AioContext *ctx)
+{
+}
projects / qemu.git / blobdiff