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authorAlex Bligh <alex@alex.org.uk>2013-08-21 16:02:41 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-08-22 15:58:05 +0200
commit02a03a9f12ec2fe68c9fed84fa8607a5326e2b65 (patch)
tree015e3d3c8f3e61aa2ad393b8e6a414bf406be0d5 /qemu-timer.c
parent58ac56b9ad53b006396523639bb7d7043edc56bf (diff)
downloadhqemu-02a03a9f12ec2fe68c9fed84fa8607a5326e2b65.zip
hqemu-02a03a9f12ec2fe68c9fed84fa8607a5326e2b65.tar.gz
aio / timers: add qemu-timer.c utility functions
Add utility functions to qemu-timer.c for nanosecond timing. Add qemu_clock_deadline_ns to calculate deadlines to nanosecond accuracy. Add utility function qemu_soonest_timeout to calculate soonest deadline. Add qemu_timeout_ns_to_ms to convert a timeout in nanoseconds back to milliseconds for when ppoll is not used. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'qemu-timer.c')
-rw-r--r--qemu-timer.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/qemu-timer.c b/qemu-timer.c
index 4117add..df8f12b 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -273,6 +273,56 @@ int64_t qemu_clock_deadline(QEMUClock *clock)
return delta;
}
+/*
+ * As above, but return -1 for no deadline, and do not cap to 2^32
+ * as we know the result is always positive.
+ */
+
+int64_t qemu_clock_deadline_ns(QEMUClock *clock)
+{
+ int64_t delta;
+
+ if (!clock->enabled || !clock->active_timers) {
+ return -1;
+ }
+
+ delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
+
+ if (delta <= 0) {
+ return 0;
+ }
+
+ return delta;
+}
+
+/* Transition function to convert a nanosecond timeout to ms
+ * This is used where a system does not support ppoll
+ */
+int qemu_timeout_ns_to_ms(int64_t ns)
+{
+ int64_t ms;
+ if (ns < 0) {
+ return -1;
+ }
+
+ if (!ns) {
+ return 0;
+ }
+
+ /* Always round up, because it's better to wait too long than to wait too
+ * little and effectively busy-wait
+ */
+ ms = (ns + SCALE_MS - 1) / SCALE_MS;
+
+ /* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */
+ if (ms > (int64_t) INT32_MAX) {
+ ms = INT32_MAX;
+ }
+
+ return (int) ms;
+}
+
+
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
QEMUTimerCB *cb, void *opaque)
{
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