[Qemu-devel] [PATCHv12 17/31] aio / timers: On timer modification, qemu_notify or aio_notify

[Alex Bligh <alex@alex.org.uk>]

On qemu_mod_timer_ns, ensure qemu_notify or aio_notify is called to
end the appropriate poll(), irrespective of use_icount value.

On qemu_clock_enable, ensure qemu_notify or aio_notify is called for
all QEMUTimerLists attached to the QEMUClock.

main-loop.c produces a (possibly spurious) warning about
multiple iterations. Adapt the way this works for a signed
timeout and make the warning a bit safer.

Signed-off-by: Alex Bligh <alex@alex.org.uk>
---
 include/qemu/timer.h |    9 +++++++++
 main-loop.c          |    6 +++---
 qemu-timer.c         |   13 ++++++++++---
 3 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 843dfe1..619b7a2 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -136,6 +136,15 @@ bool qemu_clock_use_for_deadline(QEMUClock *clock);
 QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClock *clock);
 
 /**
+ * qemu_clock_nofify:
+ * @clock: the clock to operate on
+ *
+ * Call the notifier callback connected with the default timer
+ * list linked to the clock, or qemu_notify() if none.
+ */
+void qemu_clock_notify(QEMUClock *clock);
+
+/**
  * timerlist_new:
  * @type: the clock type to associate with the timerlist
  * @cb: the callback to call on notification
diff --git a/main-loop.c b/main-loop.c
index 1cb5968..2866d95 100644
--- a/main-loop.c
+++ b/main-loop.c
@@ -209,7 +209,7 @@ static int os_host_main_loop_wait(int64_t timeout)
      * print a message to the screen.  If we run into this condition, create
      * a fake timeout in order to give the VCPU threads a chance to run.
      */
-    if (spin_counter > MAX_MAIN_LOOP_SPIN) {
+    if (!timeout && (spin_counter > MAX_MAIN_LOOP_SPIN)) {
         static bool notified;
 
         if (!notified) {
@@ -222,7 +222,7 @@ static int os_host_main_loop_wait(int64_t timeout)
         timeout = SCALE_MS;
     }
 
-    if (timeout > 0) {
+    if (timeout) {
         spin_counter = 0;
         qemu_mutex_unlock_iothread();
     } else {
@@ -231,7 +231,7 @@ static int os_host_main_loop_wait(int64_t timeout)
 
     ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout);
 
-    if (timeout > 0) {
+    if (timeout) {
         qemu_mutex_lock_iothread();
     }
 
diff --git a/qemu-timer.c b/qemu-timer.c
index c1de3d3..ec25bcc 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -304,11 +304,20 @@ bool qemu_clock_use_for_deadline(QEMUClock *clock)
     return !(use_icount && (clock->type == QEMU_CLOCK_VIRTUAL));
 }
 
+void qemu_clock_notify(QEMUClock *clock)
+{
+    QEMUTimerList *timer_list;
+    QLIST_FOREACH(timer_list, &clock->timerlists, list) {
+        timerlist_notify(timer_list);
+    }
+}
+
 void qemu_clock_enable(QEMUClock *clock, bool enabled)
 {
     bool old = clock->enabled;
     clock->enabled = enabled;
     if (enabled && !old) {
+        qemu_clock_notify(clock);
         qemu_rearm_alarm_timer(alarm_timer);
     }
 }
@@ -522,9 +531,7 @@ void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time)
         }
         /* Interrupt execution to force deadline recalculation.  */
         qemu_clock_warp(ts->timer_list->clock);
-        if (use_icount) {
-            timerlist_notify(ts->timer_list);
-        }
+        timerlist_notify(ts->timer_list);
     }
 }
 
-- 
1.7.9.5