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Comments.
[pintos-anon]
/
src
/
devices
/
timer.c
diff --git
a/src/devices/timer.c
b/src/devices/timer.c
index 9c611a1d3eda68b6fd2317304faaef9381f9eb40..ec9778321e3339aa2f32bb5496ece5e71a5ea969 100644
(file)
--- a/
src/devices/timer.c
+++ b/
src/devices/timer.c
@@
-1,10
+1,14
@@
#include "devices/timer.h"
#include <debug.h>
#include "devices/timer.h"
#include <debug.h>
+#include <inttypes.h>
#include <round.h>
#include <round.h>
+#include <stdio.h>
#include "threads/interrupt.h"
#include "threads/io.h"
#include "threads/thread.h"
#include "threads/interrupt.h"
#include "threads/io.h"
#include "threads/thread.h"
+/* See [8254] for hardware details of the 8254 timer chip. */
+
#if TIMER_FREQ < 19
#error 8254 timer requires TIMER_FREQ >= 19
#endif
#if TIMER_FREQ < 19
#error 8254 timer requires TIMER_FREQ >= 19
#endif
@@
-91,12
+95,20
@@
timer_ns2ticks (int64_t ns)
{
return DIV_ROUND_UP (ns * TIMER_FREQ, 1000000000);
}
{
return DIV_ROUND_UP (ns * TIMER_FREQ, 1000000000);
}
+
+/* Prints timer statistics. */
+void
+timer_print_stats (void)
+{
+ printf ("Timer: %"PRId64" ticks\n", ticks);
+}
\f
/* Timer interrupt handler. */
static void
timer_interrupt (struct intr_frame *args UNUSED)
{
ticks++;
\f
/* Timer interrupt handler. */
static void
timer_interrupt (struct intr_frame *args UNUSED)
{
ticks++;
+ thread_tick ();
if (ticks % TIME_SLICE == 0)
intr_yield_on_return ();
}
if (ticks % TIME_SLICE == 0)
intr_yield_on_return ();
}