Merge branch 'master' of git://git.qemu.org/qemu into prep-up

Conflicts:
	hw/Makefile.objs
	hw/ppc_prep.c

Signed-off-by: Andreas Färber <andreas.faerber@web.de>

1 files changed, 67 insertions, 120 deletions

diff --git a/main-loop.c b/main-loop.c
index eb3b6e6253..6f52ac39bc 100644
--- a/main-loop.c
+++ b/main-loop.c
@@ -23,77 +23,14 @@
  */
 
 #include "qemu-common.h"
-#include "qemu-timer.h"
+#include "qemu/timer.h"
 #include "slirp/slirp.h"
-#include "main-loop.h"
+#include "qemu/main-loop.h"
+#include "block/aio.h"
 
 #ifndef _WIN32
 
-#include "compatfd.h"
-
-static int io_thread_fd = -1;
-
-void qemu_notify_event(void)
-{
-    /* Write 8 bytes to be compatible with eventfd.  */
-    static const uint64_t val = 1;
-    ssize_t ret;
-
-    if (io_thread_fd == -1) {
-        return;
-    }
-    do {
-        ret = write(io_thread_fd, &val, sizeof(val));
-    } while (ret < 0 && errno == EINTR);
-
-    /* EAGAIN is fine, a read must be pending.  */
-    if (ret < 0 && errno != EAGAIN) {
-        fprintf(stderr, "qemu_notify_event: write() failed: %s\n",
-                strerror(errno));
-        exit(1);
-    }
-}
-
-static void qemu_event_read(void *opaque)
-{
-    int fd = (intptr_t)opaque;
-    ssize_t len;
-    char buffer[512];
-
-    /* Drain the notify pipe.  For eventfd, only 8 bytes will be read.  */
-    do {
-        len = read(fd, buffer, sizeof(buffer));
-    } while ((len == -1 && errno == EINTR) || len == sizeof(buffer));
-}
-
-static int qemu_event_init(void)
-{
-    int err;
-    int fds[2];
-
-    err = qemu_eventfd(fds);
-    if (err == -1) {
-        return -errno;
-    }
-    err = fcntl_setfl(fds[0], O_NONBLOCK);
-    if (err < 0) {
-        goto fail;
-    }
-    err = fcntl_setfl(fds[1], O_NONBLOCK);
-    if (err < 0) {
-        goto fail;
-    }
-    qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL,
-                         (void *)(intptr_t)fds[0]);
-
-    io_thread_fd = fds[1];
-    return 0;
-
-fail:
-    close(fds[0]);
-    close(fds[1]);
-    return err;
-}
+#include "qemu/compatfd.h"
 
 /* If we have signalfd, we mask out the signals we want to handle and then
  * use signalfd to listen for them.  We rely on whatever the current signal
@@ -164,57 +101,42 @@ static int qemu_signal_init(void)
 
 #else /* _WIN32 */
 
-static HANDLE qemu_event_handle = NULL;
-
-static void dummy_event_handler(void *opaque)
-{
-}
-
-static int qemu_event_init(void)
+static int qemu_signal_init(void)
 {
-    qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL);
-    if (!qemu_event_handle) {
-        fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
-        return -1;
-    }
-    qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
     return 0;
 }
+#endif
+
+static AioContext *qemu_aio_context;
 
 void qemu_notify_event(void)
 {
-    if (!qemu_event_handle) {
+    if (!qemu_aio_context) {
         return;
     }
-    if (!SetEvent(qemu_event_handle)) {
-        fprintf(stderr, "qemu_notify_event: SetEvent failed: %ld\n",
-                GetLastError());
-        exit(1);
-    }
+    aio_notify(qemu_aio_context);
 }
 
-static int qemu_signal_init(void)
-{
-    return 0;
-}
-#endif
-
-int main_loop_init(void)
+int qemu_init_main_loop(void)
 {
     int ret;
+    GSource *src;
 
-    qemu_mutex_lock_iothread();
-    ret = qemu_signal_init();
-    if (ret) {
-        return ret;
+    init_clocks();
+    if (init_timer_alarm() < 0) {
+        fprintf(stderr, "could not initialize alarm timer\n");
+        exit(1);
     }
 
-    /* Note eventfd must be drained before signalfd handlers run */
-    ret = qemu_event_init();
+    ret = qemu_signal_init();
     if (ret) {
         return ret;
     }
 
+    qemu_aio_context = aio_context_new();
+    src = aio_get_g_source(qemu_aio_context);
+    g_source_attach(src, NULL);
+    g_source_unref(src);
     return 0;
 }
 
@@ -400,14 +322,15 @@ void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
 
 void qemu_fd_register(int fd)
 {
-    WSAEventSelect(fd, qemu_event_handle, FD_READ | FD_ACCEPT | FD_CLOSE |
+    WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier),
+                   FD_READ | FD_ACCEPT | FD_CLOSE |
                    FD_CONNECT | FD_WRITE | FD_OOB);
 }
 
 static int os_host_main_loop_wait(uint32_t timeout)
 {
     GMainContext *context = g_main_context_default();
-    int ret, i;
+    int select_ret, g_poll_ret, ret, i;
     PollingEntry *pe;
     WaitObjects *w = &wait_objects;
     gint poll_timeout;
@@ -422,13 +345,6 @@ static int os_host_main_loop_wait(uint32_t timeout)
         return ret;
     }
 
-    if (nfds >= 0) {
-        ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
-        if (ret != 0) {
-            timeout = 0;
-        }
-    }
-
     g_main_context_prepare(context, &max_priority);
     n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
                                       poll_fds, ARRAY_SIZE(poll_fds));
@@ -444,9 +360,9 @@ static int os_host_main_loop_wait(uint32_t timeout)
     }
 
     qemu_mutex_unlock_iothread();
-    ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout);
+    g_poll_ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout);
     qemu_mutex_lock_iothread();
-    if (ret > 0) {
+    if (g_poll_ret > 0) {
         for (i = 0; i < w->num; i++) {
             w->revents[i] = poll_fds[n_poll_fds + i].revents;
         }
@@ -461,12 +377,18 @@ static int os_host_main_loop_wait(uint32_t timeout)
         g_main_context_dispatch(context);
     }
 
-    /* If an edge-triggered socket event occurred, select will return a
-     * positive result on the next iteration.  We do not need to do anything
-     * here.
+    /* Call select after g_poll to avoid a useless iteration and therefore
+     * improve socket latency.
      */
 
-    return ret;
+    if (nfds >= 0) {
+        select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
+        if (select_ret != 0) {
+            timeout = 0;
+        }
+    }
+
+    return select_ret || g_poll_ret;
 }
 #endif
 
@@ -477,8 +399,6 @@ int main_loop_wait(int nonblocking)
 
     if (nonblocking) {
         timeout = 0;
-    } else {
-        qemu_bh_update_timeout(&timeout);
     }
 
     /* poll any events */
@@ -501,9 +421,36 @@ int main_loop_wait(int nonblocking)
 
     qemu_run_all_timers();
 
-    /* Check bottom-halves last in case any of the earlier events triggered
-       them.  */
-    qemu_bh_poll();
-
     return ret;
 }
+
+/* Functions to operate on the main QEMU AioContext.  */
+
+QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
+{
+    return aio_bh_new(qemu_aio_context, cb, opaque);
+}
+
+bool qemu_aio_wait(void)
+{
+    return aio_poll(qemu_aio_context, true);
+}
+
+#ifdef CONFIG_POSIX
+void qemu_aio_set_fd_handler(int fd,
+                             IOHandler *io_read,
+                             IOHandler *io_write,
+                             AioFlushHandler *io_flush,
+                             void *opaque)
+{
+    aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush,
+                       opaque);
+}
+#endif
+
+void qemu_aio_set_event_notifier(EventNotifier *notifier,
+                                 EventNotifierHandler *io_read,
+                                 AioFlushEventNotifierHandler *io_flush)
+{
+    aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush);
+}