[Qemu-devel] [RFC] [PATCHv7 09/22] aio / timers: Add QEMUTimerListGroup and helper functions

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

Add QEMUTimerListGroup and helper functions, to represent
a QEMUTimerList associated with each clock. Add a default
QEMUTimerListGroup representing the default timer lists
which are not associated with any other object (e.g.
an AioContext as added by future patches).

Signed-off-by: Alex Bligh <alex@alex.org.uk>
---
 include/qemu/timer.h |   45 +++++++++++++++++++++++++++++++++++++++++++++
 qemu-timer.c         |   41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+)

diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 0dbb982..bc258ec 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -52,8 +52,10 @@ typedef enum {
 
 typedef struct QEMUClock QEMUClock;
 typedef struct QEMUTimerList QEMUTimerList;
+typedef QEMUTimerList *QEMUTimerListGroup[QEMU_CLOCK_MAX];
 typedef void QEMUTimerCB(void *opaque);
 
+extern QEMUTimerListGroup main_loop_tlg;
 extern QEMUClock *qemu_clocks[QEMU_CLOCK_MAX];
 
 /**
@@ -229,6 +231,49 @@ QEMUClock *timerlist_get_clock(QEMUTimerList *timer_list);
 bool timerlist_run_timers(QEMUTimerList *timer_list);
 
 /**
+ * timerlistgroup_init:
+ * @tlg: the timer list group
+ *
+ * Initialise a timer list group. This must already be
+ * allocated in memory and zeroed.
+ */
+void timerlistgroup_init(QEMUTimerListGroup tlg);
+
+/**
+ * timerlistgroup_deinit:
+ * @tlg: the timer list group
+ *
+ * Deinitialise a timer list group. This must already be
+ * initialised. Note the memory is not freed.
+ */
+void timerlistgroup_deinit(QEMUTimerListGroup tlg);
+
+/**
+ * timerlistgroup_run_timers:
+ * @tlg: the timer list group
+ *
+ * Run the timers associated with a timer list group.
+ * This will run timers on multiple clocks.
+ *
+ * Returns: true if any timer callback ran
+ */
+bool timerlistgroup_run_timers(QEMUTimerListGroup tlg);
+
+/**
+ * timerlistgroup_deadline_ns
+ * @tlg: the timer list group
+ *
+ * Determine the deadline of the soonest timer to
+ * expire associated with any timer list linked to
+ * the timer list group. Only clocks suitable for
+ * deadline calculation are included.
+ *
+ * Returns: the deadline in nanoseconds or -1 if no
+ * timers are to expire.
+ */
+int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup tlg);
+
+/**
  * qemu_timeout_ns_to_ms:
  * @ns: nanosecond timeout value
  *
diff --git a/qemu-timer.c b/qemu-timer.c
index 46f4029..5c55c1a 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -59,6 +59,7 @@ struct QEMUClock {
     bool enabled;
 };
 
+QEMUTimerListGroup main_loop_tlg;
 QEMUClock *qemu_clocks[QEMU_CLOCK_MAX];
 
 /* A QEMUTimerList is a list of timers attached to a clock. More
@@ -581,6 +582,45 @@ bool qemu_run_timers(QEMUClock *clock)
     return timerlist_run_timers(clock->default_timerlist);
 }
 
+void timerlistgroup_init(QEMUTimerListGroup tlg)
+{
+    QEMUClockType type;
+    for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+        tlg[type] = timerlist_new(type);
+    }
+}
+
+void timerlistgroup_deinit(QEMUTimerListGroup tlg)
+{
+    QEMUClockType type;
+    for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+        timerlist_free(tlg[type]);
+    }
+}
+
+bool timerlistgroup_run_timers(QEMUTimerListGroup tlg)
+{
+    QEMUClockType type;
+    bool progress = false;
+    for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+        progress |= timerlist_run_timers(tlg[type]);
+    }
+    return progress;
+}
+
+int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup tlg)
+{
+    int64_t deadline = -1;
+    QEMUClockType type;
+    for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+        if (qemu_clock_use_for_deadline(tlg[type]->clock)) {
+            deadline = qemu_soonest_timeout(deadline,
+                                            timerlist_deadline_ns(tlg[type]));
+        }
+    }
+    return deadline;
+}
+
 int64_t qemu_get_clock_ns(QEMUClock *clock)
 {
     int64_t now, last;
@@ -622,6 +662,7 @@ void init_clocks(void)
     for (type = 0; type < QEMU_CLOCK_MAX; type++) {
         if (!qemu_clocks[type]) {
             qemu_clocks[type] = qemu_clock_new(type);
+            main_loop_tlg[type] = qemu_clocks[type]->default_timerlist;
         }
     }
 
-- 
1.7.9.5