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-rw-r--r--erts/emulator/beam/break.c2
-rw-r--r--erts/emulator/beam/erl_time.h50
-rw-r--r--erts/emulator/beam/time.c810
3 files changed, 671 insertions, 191 deletions
diff --git a/erts/emulator/beam/break.c b/erts/emulator/beam/break.c
index 0b40d70cb7..538ab0d947 100644
--- a/erts/emulator/beam/break.c
+++ b/erts/emulator/beam/break.c
@@ -590,7 +590,7 @@ do_break(void)
#endif
#ifdef DEBUG
case 't':
- erts_p_slpq();
+ /* erts_p_slpq(); */
return;
case 'b':
bin_check();
diff --git a/erts/emulator/beam/erl_time.h b/erts/emulator/beam/erl_time.h
index 00b4a84b4a..699e69e991 100644
--- a/erts/emulator/beam/erl_time.h
+++ b/erts/emulator/beam/erl_time.h
@@ -21,19 +21,52 @@
#ifndef ERL_TIME_H__
#define ERL_TIME_H__
-/* timer wheel size NEED to be a power of 2 */
-#ifdef SMALL_MEMORY
-#define ERTS_TIW_SIZE (1 << 13)
-#else
-#define ERTS_TIW_SIZE (1 << 16)
+#if 0
+# define ERTS_TW_DEBUG
+#endif
+#if defined(DEBUG) && !defined(ERTS_TW_DEBUG)
+# define ERTS_TW_DEBUG
#endif
-#if defined(DEBUG) || 0
+#if defined(ERTS_TW_DEBUG)
#define ERTS_TIME_ASSERT(B) ERTS_ASSERT(B)
#else
#define ERTS_TIME_ASSERT(B) ((void) 1)
#endif
+#ifdef ERTS_TW_DEBUG
+/*
+ * Soon wheel will handle about 1 seconds
+ * Later wheel will handle about 8 minutes
+ */
+# define ERTS_TW_SOON_WHEEL_BITS 10
+# define ERTS_TW_LATER_WHEEL_BITS 10
+#else
+# ifdef SMALL_MEMORY
+/*
+ * Soon wheel will handle about 4 seconds
+ * Later wheel will handle about 2 hours and 19 minutes
+ */
+# define ERTS_TW_SOON_WHEEL_BITS 12
+# define ERTS_TW_LATER_WHEEL_BITS 12
+# else
+/*
+ * Soon wheel will handle about 16 seconds
+ * Later wheel will handle about 37 hours and 16 minutes
+ */
+# define ERTS_TW_SOON_WHEEL_BITS 14
+# define ERTS_TW_LATER_WHEEL_BITS 14
+# endif
+#endif
+
+/*
+ * Number of slots in each timer wheel...
+ *
+ * These *need* to be a power of 2
+ */
+#define ERTS_TW_SOON_WHEEL_SIZE (1 << ERTS_TW_SOON_WHEEL_BITS)
+#define ERTS_TW_LATER_WHEEL_SIZE (1 << ERTS_TW_LATER_WHEEL_BITS)
+
typedef enum {
ERTS_NO_TIME_WARP_MODE,
ERTS_SINGLE_TIME_WARP_MODE,
@@ -103,7 +136,10 @@ Eterm erts_system_time_source(struct process*c_p);
#define ERTS_CLKTCK_RESOLUTION (erts_time_sup__.r.o.clktck_resolution)
#endif
-#define ERTS_TIMER_WHEEL_MSEC (ERTS_TIW_SIZE/(ERTS_CLKTCK_RESOLUTION/1000))
+#define ERTS_TW_SOON_WHEEL_MSEC (ERTS_TW_SOON_WHEEL_SIZE/(ERTS_CLKTCK_RESOLUTION/1000))
+#define ERTS_TW_LATER_WHEEL_MSEC (ERTS_TW_LATER_WHEEL_SIZE*ERTS_TW_SOON_WHEEL_MSEC/2)
+
+#define ERTS_TIMER_WHEEL_MSEC ERTS_TW_LATER_WHEEL_MSEC
struct erts_time_sup_read_only__ {
ErtsMonotonicTime monotonic_time_unit;
diff --git a/erts/emulator/beam/time.c b/erts/emulator/beam/time.c
index 53896be19e..7b5ff7b992 100644
--- a/erts/emulator/beam/time.c
+++ b/erts/emulator/beam/time.c
@@ -17,57 +17,124 @@
*
* %CopyrightEnd%
*/
+
/*
- * TIMING WHEEL
+ * TIMER WHEEL
+ *
+ *
+ * The time scale used for timers is Erlang monotonic time. The
+ * time unit used is ERTS specific clock ticks. A clock tick is
+ * currently defined to 1 millisecond. That is, the resolution of
+ * timers triggered by the runtime system is 1 millisecond.
*
- * Timeouts kept in an wheel. A timeout is measured relative to the
- * current slot (tiw_pos) in the wheel, and inserted at slot
- * (tiw_pos + timeout) % TIW_SIZE. Each timeout also has a count
- * equal to timeout/TIW_SIZE, which is needed since the time axis
- * is wrapped arount the wheel.
+ * When a timer is set, it is determined at what Erlang monotonic
+ * time, in clock ticks, it should be triggered.
*
- * Several slots may be processed in one operation. If the number of
- * slots is greater that the wheel size, the wheel is only traversed
- * once,
+ * The 'pos' field of the wheel corresponds to current time of
+ * the wheel. That is, it corresponds to Erlang monotonic time in
+ * clock tick time unit. The 'pos' field of the wheel is
+ * monotonically increased when erts_bump_timers() is called. All
+ * timers in the wheel that have a time less than or equal to
+ * 'pos' are triggered by the bump operation. The bump operation
+ * may however be spread over multiple calls to erts_bump_timers()
+ * if there are a lots of timers to trigger.
+ *
+ * Each scheduler thread maintains its own timer wheel. The timer
+ * wheel of a scheduler, however, actually consists of two wheels.
+ * A soon wheel and a later wheel.
+ *
+ *
+ * -- The Soon Wheel --
+ *
+ * The soon wheel contain timers that should be triggered soon.
+ * That is, they are soon to be triggered. Each slot in the soon
+ * wheel is 1 clock tick wide. The number of slots in the soon
+ * wheel is currently 2¹⁴. That is, it contains timers in the
+ * range ('pos', 'pos' + 2¹⁴] which corresponds to a bit more
+ * than 16 seconds.
+ *
+ * When the bump operation is started, 'pos' is moved forward to a
+ * position that corresponds to current Erlang monotonic time. Then
+ * all timers that are in the range (old 'pos', new 'pos'] are
+ * triggered. During a bump operation, the soon wheel may contain
+ * timers in the two, possibly overlapping, ranges (old 'pos',
+ * old 'pos' + 2¹⁴], and (new 'pos', new 'pos' + 2¹⁴]. This may
+ * occur even if the bump operation doesn't yield, due to timeout
+ * callbacks inserting new timers.
+ *
+ *
+ * -- The Later Wheel --
+ *
+ * The later wheel contain timers that are further away from 'pos'
+ * than the width of the soon timer wheel. That is, currently
+ * timers further away from 'pos' than 2¹⁴ clock ticks. The width
+ * of each slot in the later wheel is half the width of the soon
+ * wheel. That is, each slot is currently 2¹³ clock ticks wide
+ * which corresponds to about 8 seconds. If three timers of the
+ * times 'pos' + 17000, 'pos' + 18000, and 'pos' + 19000 are
+ * inserted, they will all end up in the same slot in the later
+ * wheel.
+ *
+ * The number of slots in the later wheel is currently the same as
+ * in the soon wheel, i.e. 2¹⁴. That is, one revolution of the later
+ * wheel currently corresponds to 2¹⁴×2¹³ clock ticks which is
+ * almost 37 ½ hour. Timers even further away than that are put in
+ * the later slot identified by their time modulo the size of the later
+ * wheel. Such timers are however very uncommon. Most timers used
+ * by the runtime system will utilize the high level timer API.
+ * The high level timer implementation will not insert timers
+ * further away then one revolution into the later wheel. It will
+ * instead keep such timers in a tree of very long timers. The
+ * high level timer implementation utilize one timer wheel timer
+ * for the management of this tree of timers. This timer is set to
+ * the closest timeout in the tree. This timer may however be
+ * further away than one revolution in the later wheel.
+ *
+ * The 'later.pos' field identifies next position in the later wheel.
+ * 'later.pos' is always increased by the width of a later wheel slot.
+ * That is, currently 2¹³ clock ticks. When 'pos' is moved (during
+ * a bump operation) closer to 'later.pos' than the width of a later
+ * wheel slot, i.e. currently when 'pos' + 2¹³ ≥ 'later.pos', we
+ * inspect the slot identified by 'later.pos' and then move 'later.pos'
+ * forward. When inspecting the later slot we move all timers in the
+ * slot, that are in the soon wheel range, from the later wheel to
+ * the soon wheel. Timers one or more revolutions of the later wheel
+ * away are kept in the slot.
+ *
+ * During normal operation, timers originally located in the later
+ * wheel will currently be moved into the soon wheel about 8 to
+ * 16 seconds before they should be triggered. During extremely
+ * heavy load, the scheduler might however be heavily delayed, so
+ * the code must be prepared for situations where time for
+ * triggering the timer has passed when we inspect the later wheel
+ * slot, and then trigger the timer immediately. We must also be
+ * prepared to inspect multiple later wheel slots at once due to the
+ * delay.
+ *
+ *
+ * -- Slot Management --
+ *
+ * All timers of a slot are placed in a circular double linked
+ * list. This makes insertion and removal of a timer O(1).
+ *
+ * While bumping timers in a slot, we move the circular list
+ * away from the slot, and refer to it from the 'sentinel'
+ * field. The list will stay there until we are done with it
+ * even if the bump operation should yield. The cancel operation
+ * can remove the timer from this position as well as from the
+ * slot position by just removing it from the circular double
+ * linked list that it is in.
+ *
+ * -- At Once List --
+ *
+ * If a timer is set that has a time earlier or equal to 'pos',
+ * it is not inserted into the wheel. It is instead inserted,
+ * into a list referred to by the 'at_once' field. When the
+ * bump operation is performed thise timers will be triggered
+ * at once.
*
- * The following example shows a time axis where there is one timeout
- * at each "tick", and where 1, 2, 3 ... wheel slots are released in
- * one operation. The notation "<x" means "release all items with
- * counts less than x".
*
- * Size of wheel: 4
- *
- * --|----|----|----|----|----|----|----|----|----|----|----|----|----
- * 0.0 0.1 0.2 0.3 1.0 1.1 1.2 1.3 2.0 2.1 2.2 2.3 3.0
- *
- * 1 [ )
- * <1 0.1 0.2 0.3 0.0 1.1 1.2 1.3 1.0 2.1 2.2 2.3 2.0
- *
- * 2 [ )
- * <1 <1 0.2 0.3 0.0 0.1 1.2 1.3 1.0 1.1 2.2 2.3 2.0
- *
- * 3 [ )
- * <1 <1 <1 0.3 0.0 0.1 0.2 1.3 1.0 1.1 1.2 2.3 2.0
- *
- * 4 [ )
- * <1 <1 <1 <1 0.0 0.1 0.2 0.3 1.0 1.1 1.2 1.3 2.0
- *
- * 5 [ )
- * <2 <1 <1 <1. 0.1 0.2 0.3 0.0 1.1 1.2 1.3 1.0
- *
- * 6 [ )
- * <2 <2 <1 <1. 0.2 0.3 0.0 0.1 1.2 1.3 1.0
- *
- * 7 [ )
- * <2 <2 <2 <1. 0.3 0.0 0.1 0.2 1.3 1.0
- *
- * 8 [ )
- * <2 <2 <2 <2. 0.0 0.1 0.2 0.3 1.0
- *
- * 9 [ )
- * <3 <2 <2 <2. 0.1 0.2 0.3 0.0
- *
*/
#ifdef HAVE_CONFIG_H
@@ -90,6 +157,10 @@
#endif
#if 0
+# define ERTS_TW_HARD_DEBUG
+#endif
+
+#if defined(ERTS_TW_HARD_DEBUG) && !defined(ERTS_TW_DEBUG)
# define ERTS_TW_DEBUG
#endif
#if defined(DEBUG) && !defined(ERTS_TW_DEBUG)
@@ -97,17 +168,48 @@
#endif
#undef ERTS_TW_ASSERT
-#if defined(ERTS_TW_DEBUG)
+#if defined(ERTS_TW_DEBUG)
# define ERTS_TW_ASSERT(E) ERTS_ASSERT(E)
#else
# define ERTS_TW_ASSERT(E) ((void) 1)
#endif
#ifdef ERTS_TW_DEBUG
-# define ERTS_TWHEEL_BUMP_YIELD_LIMIT 5
+# define ERTS_TWHEEL_BUMP_YIELD_LIMIT 500
#else
-# define ERTS_TWHEEL_BUMP_YIELD_LIMIT 100
+# define ERTS_TWHEEL_BUMP_YIELD_LIMIT 10000
#endif
+#define ERTS_TW_COST_SLOT 1
+#define ERTS_TW_COST_SLOT_MOVE 5
+#define ERTS_TW_COST_TIMEOUT 100
+
+/*
+ * Every slot in the soon wheel is a clock tick (as defined
+ * by ERTS) wide. A clock tick is currently 1 milli second.
+ */
+
+#define ERTS_TW_SOON_WHEEL_FIRST_SLOT 0
+#define ERTS_TW_SOON_WHEEL_END_SLOT \
+ (ERTS_TW_SOON_WHEEL_FIRST_SLOT + ERTS_TW_SOON_WHEEL_SIZE)
+
+#define ERTS_TW_SOON_WHEEL_MASK (ERTS_TW_SOON_WHEEL_SIZE-1)
+
+/*
+ * Every slot in the later wheel is as wide as half the size
+ * of the soon wheel.
+ */
+
+#define ERTS_TW_LATER_WHEEL_SHIFT (ERTS_TW_SOON_WHEEL_BITS - 1)
+#define ERTS_TW_LATER_WHEEL_SLOT_SIZE \
+ ((ErtsMonotonicTime) (1 << ERTS_TW_LATER_WHEEL_SHIFT))
+#define ERTS_TW_LATER_WHEEL_POS_MASK \
+ (~((ErtsMonotonicTime) (1 << ERTS_TW_LATER_WHEEL_SHIFT)-1))
+
+#define ERTS_TW_LATER_WHEEL_FIRST_SLOT ERTS_TW_SOON_WHEEL_SIZE
+#define ERTS_TW_LATER_WHEEL_END_SLOT \
+ (ERTS_TW_LATER_WHEEL_FIRST_SLOT + ERTS_TW_LATER_WHEEL_SIZE)
+
+#define ERTS_TW_LATER_WHEEL_MASK (ERTS_TW_LATER_WHEEL_SIZE-1)
/* Actual interval time chosen by sys_init_time() */
@@ -120,7 +222,7 @@ static int tiw_itime; /* Constant after init */
#endif
struct ErtsTimerWheel_ {
- ErtsTWheelTimer *w[ERTS_TIW_SIZE];
+ ErtsTWheelTimer *w[ERTS_TW_SOON_WHEEL_SIZE + ERTS_TW_LATER_WHEEL_SIZE];
ErtsMonotonicTime pos;
Uint nto;
struct {
@@ -128,14 +230,58 @@ struct ErtsTimerWheel_ {
ErtsTWheelTimer *tail;
Uint nto;
} at_once;
+ struct {
+ Uint nto;
+ } soon;
+ struct {
+ ErtsMonotonicTime pos;
+ } later;
int yield_slot;
int yield_slots_left;
- int yield_start_pos;
ErtsTWheelTimer sentinel;
int true_next_timeout_time;
ErtsMonotonicTime next_timeout_time;
};
+#define ERTS_TW_BUMP_LATER_WHEEL(TIW) \
+ ((tiw)->pos + ERTS_TW_LATER_WHEEL_SLOT_SIZE >= (TIW)->later.pos)
+
+static int bump_later_wheel(ErtsTimerWheel *tiw, int *yield_count_p);
+
+static ERTS_INLINE int
+soon_slot(ErtsMonotonicTime soon_pos)
+{
+ ErtsMonotonicTime slot = soon_pos;
+ slot &= ERTS_TW_SOON_WHEEL_MASK;
+
+ ERTS_TW_ASSERT(ERTS_TW_SOON_WHEEL_FIRST_SLOT <= slot);
+ ERTS_TW_ASSERT(slot < ERTS_TW_SOON_WHEEL_END_SLOT);
+
+ return (int) slot;
+}
+
+static ERTS_INLINE int
+later_slot(ErtsMonotonicTime later_pos)
+{
+ ErtsMonotonicTime slot = later_pos;
+ slot >>= ERTS_TW_LATER_WHEEL_SHIFT;
+ slot &= ERTS_TW_LATER_WHEEL_MASK;
+ slot += ERTS_TW_LATER_WHEEL_FIRST_SLOT;
+
+ ERTS_TW_ASSERT(ERTS_TW_LATER_WHEEL_FIRST_SLOT <= slot);
+ ERTS_TW_ASSERT(slot < ERTS_TW_LATER_WHEEL_END_SLOT);
+
+ return (int) slot;
+}
+
+#ifdef ERTS_TW_HARD_DEBUG
+#define ERTS_HARD_DBG_CHK_WHEELS(TIW, CHK_MIN_TPOS) \
+ hrd_dbg_check_wheels((TIW), (CHK_MIN_TPOS))
+static void hrd_dbg_check_wheels(ErtsTimerWheel *tiw, int check_min_tpos);
+#else
+#define ERTS_HARD_DBG_CHK_WHEELS(TIW, CHK_MIN_TPOS)
+#endif
+
static ERTS_INLINE ErtsMonotonicTime
find_next_timeout(ErtsSchedulerData *esdp,
ErtsTimerWheel *tiw,
@@ -143,11 +289,14 @@ find_next_timeout(ErtsSchedulerData *esdp,
ErtsMonotonicTime curr_time, /* When !search_all */
ErtsMonotonicTime max_search_time) /* When !search_all */
{
- int start_ix, tiw_pos_ix;
- ErtsTWheelTimer *p;
+ int start_ix, tiw_pos_ix, pos_inc, wheel_start_ix, wheel_end_ix;
int true_min_timeout = 0;
ErtsMonotonicTime min_timeout, min_timeout_pos, slot_timeout_pos;
+ ERTS_HARD_DBG_CHK_WHEELS(tiw, 0);
+
+ ERTS_TW_ASSERT(tiw->yield_slot == ERTS_TWHEEL_SLOT_INACTIVE);
+
if (tiw->nto == 0) { /* no timeouts in wheel */
if (!search_all)
min_timeout_pos = tiw->pos;
@@ -156,58 +305,115 @@ find_next_timeout(ErtsSchedulerData *esdp,
tiw->pos = min_timeout_pos = ERTS_MONOTONIC_TO_CLKTCKS(curr_time);
}
min_timeout_pos += ERTS_MONOTONIC_TO_CLKTCKS(ERTS_MONOTONIC_DAY);
- goto found_next;
+ goto done;
}
- slot_timeout_pos = min_timeout_pos = tiw->pos;
if (search_all)
- min_timeout_pos += ERTS_MONOTONIC_TO_CLKTCKS(ERTS_MONOTONIC_DAY);
+ min_timeout_pos = tiw->pos + ERTS_MONOTONIC_TO_CLKTCKS(ERTS_MONOTONIC_DAY);
else
- min_timeout_pos = ERTS_MONOTONIC_TO_CLKTCKS(curr_time + max_search_time);
+ min_timeout_pos = ERTS_MONOTONIC_TO_CLKTCKS(curr_time + max_search_time);
+
+ if (!tiw->soon.nto) {
+ /* Select later wheel... */
+ slot_timeout_pos = tiw->later.pos;
+ start_ix = tiw_pos_ix = later_slot(slot_timeout_pos);
+ pos_inc = ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ wheel_start_ix = ERTS_TW_LATER_WHEEL_FIRST_SLOT;
+ wheel_end_ix = ERTS_TW_LATER_WHEEL_END_SLOT;
+ /* Pre-timeout for move from later to soon wheel... */
+ slot_timeout_pos -= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ }
+ else {
+ /* Select soon wheel... */
+
+ /*
+ * Besides inspecting the soon wheel we
+ * may also have to inspect two slots in the
+ * later wheel which potentially can trigger
+ * timeouts before timeouts in soon wheel...
+ */
+ slot_timeout_pos = tiw->later.pos;
+ slot_timeout_pos -= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ if (slot_timeout_pos < min_timeout_pos) {
+ int fslot = later_slot(tiw->later.pos);
+ if (tiw->w[fslot]) {
+ min_timeout_pos = slot_timeout_pos;
+ true_min_timeout = 1;
+ }
+ else {
+ slot_timeout_pos += ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ if (slot_timeout_pos < min_timeout_pos) {
+ fslot++;
+ if (fslot == ERTS_TW_LATER_WHEEL_END_SLOT)
+ fslot = ERTS_TW_LATER_WHEEL_FIRST_SLOT;
+ if (tiw->w[fslot]) {
+ min_timeout_pos = slot_timeout_pos;
+ true_min_timeout = 1;
+ }
+ }
+ }
+ }
- start_ix = tiw_pos_ix = (int) (tiw->pos & (ERTS_TIW_SIZE-1));
+ slot_timeout_pos = tiw->pos;
+ start_ix = tiw_pos_ix = soon_slot(tiw->pos);
+ pos_inc = 1;
+ wheel_start_ix = ERTS_TW_SOON_WHEEL_FIRST_SLOT;
+ wheel_end_ix = ERTS_TW_SOON_WHEEL_END_SLOT;
+ }
+ /*
+ * Scan selected wheel...
+ */
do {
- if (++slot_timeout_pos >= min_timeout_pos)
- break;
-
- p = tiw->w[tiw_pos_ix];
-
- if (p) {
- ErtsTWheelTimer *end = p;
-
- do {
- ErtsMonotonicTime timeout_pos;
- timeout_pos = p->timeout_pos;
- if (min_timeout_pos > timeout_pos) {
- true_min_timeout = 1;
- min_timeout_pos = timeout_pos;
- if (min_timeout_pos <= slot_timeout_pos)
- goto found_next;
- }
- p = p->next;
- } while (p != end);
- }
-
- tiw_pos_ix++;
- if (tiw_pos_ix == ERTS_TIW_SIZE)
- tiw_pos_ix = 0;
+ if (tiw->w[tiw_pos_ix]) {
+ min_timeout_pos = slot_timeout_pos;
+ true_min_timeout = 1;
+ break;
+ }
+
+ slot_timeout_pos += pos_inc;
+ if (slot_timeout_pos >= min_timeout_pos)
+ break;
+
+ tiw_pos_ix++;
+ if (tiw_pos_ix == wheel_end_ix)
+ tiw_pos_ix = wheel_start_ix;
} while (start_ix != tiw_pos_ix);
-found_next:
+done:
min_timeout = ERTS_CLKTCKS_TO_MONOTONIC(min_timeout_pos);
tiw->next_timeout_time = min_timeout;
tiw->true_next_timeout_time = true_min_timeout;
+ ERTS_HARD_DBG_CHK_WHEELS(tiw, 1);
+
return min_timeout;
}
static ERTS_INLINE void
+insert_timer_into_at_once_list(ErtsTimerWheel *tiw, ErtsTWheelTimer *p)
+{
+ tiw->at_once.nto++;
+ p->next = NULL;
+ p->prev = tiw->at_once.tail;
+ if (tiw->at_once.tail) {
+ ERTS_TW_ASSERT(tiw->at_once.head);
+ tiw->at_once.tail->next = p;
+ }
+ else {
+ ERTS_TW_ASSERT(!tiw->at_once.head);
+ tiw->at_once.head = p;
+ }
+ tiw->at_once.tail = p;
+ p->slot = ERTS_TWHEEL_SLOT_AT_ONCE;
+}
+
+static ERTS_INLINE void
insert_timer_into_slot(ErtsTimerWheel *tiw, int slot, ErtsTWheelTimer *p)
{
- ERTS_TW_ASSERT(slot >= 0);
- ERTS_TW_ASSERT(slot < ERTS_TIW_SIZE);
+ ERTS_TW_ASSERT(ERTS_TW_SOON_WHEEL_FIRST_SLOT <= slot);
+ ERTS_TW_ASSERT(slot < ERTS_TW_LATER_WHEEL_END_SLOT);
p->slot = slot;
if (!tiw->w[slot]) {
tiw->w[slot] = p;
@@ -223,6 +429,10 @@ insert_timer_into_slot(ErtsTimerWheel *tiw, int slot, ErtsTWheelTimer *p)
prev->next = p;
next->prev = p;
}
+ if (slot < ERTS_TW_SOON_WHEEL_END_SLOT) {
+ ERTS_TW_ASSERT(p->timeout_pos < tiw->pos + ERTS_TW_SOON_WHEEL_SIZE);
+ tiw->soon.nto++;
+ }
}
static ERTS_INLINE void
@@ -231,13 +441,13 @@ remove_timer(ErtsTimerWheel *tiw, ErtsTWheelTimer *p)
int slot = p->slot;
ERTS_TW_ASSERT(slot != ERTS_TWHEEL_SLOT_INACTIVE);
- if (slot >= 0) {
+ if (slot >= ERTS_TW_SOON_WHEEL_FIRST_SLOT) {
/*
* Timer in wheel or in circular
* list of timers currently beeing
* triggered (referred by sentinel).
*/
- ERTS_TW_ASSERT(slot < ERTS_TIW_SIZE);
+ ERTS_TW_ASSERT(slot < ERTS_TW_LATER_WHEEL_END_SLOT);
if (p->next == p) {
ERTS_TW_ASSERT(tiw->w[slot] == p);
@@ -249,6 +459,8 @@ remove_timer(ErtsTimerWheel *tiw, ErtsTWheelTimer *p)
p->prev->next = p->next;
p->next->prev = p->prev;
}
+ if (slot < ERTS_TW_SOON_WHEEL_END_SLOT)
+ tiw->soon.nto--;
}
else {
/* Timer in "at once" queue... */
@@ -270,8 +482,6 @@ remove_timer(ErtsTimerWheel *tiw, ErtsTWheelTimer *p)
}
p->slot = ERTS_TWHEEL_SLOT_INACTIVE;
-
- tiw->nto--;
}
ErtsMonotonicTime
@@ -299,13 +509,13 @@ debug_check_safe_to_skip_to(ErtsTimerWheel *tiw, ErtsMonotonicTime skip_to_pos)
ErtsTWheelTimer *tmr;
ErtsMonotonicTime tmp;
- ix = (int) (tiw->pos & (ERTS_TIW_SIZE-1));
+ ix = soon_slot(tiw->pos);
tmp = skip_to_pos - tiw->pos;
ERTS_TW_ASSERT(tmp >= 0);
- if (tmp < (ErtsMonotonicTime) ERTS_TIW_SIZE)
+ if (tmp < (ErtsMonotonicTime) ERTS_TW_SOON_WHEEL_SIZE)
slots = (int) tmp;
else
- slots = ERTS_TIW_SIZE;
+ slots = ERTS_TW_SOON_WHEEL_SIZE;
while (slots > 0) {
tmr = tiw->w[ix];
@@ -317,10 +527,41 @@ debug_check_safe_to_skip_to(ErtsTimerWheel *tiw, ErtsMonotonicTime skip_to_pos)
} while (tmr != end);
}
ix++;
- if (ix == ERTS_TIW_SIZE)
- ix = 0;
+ if (ix == ERTS_TW_SOON_WHEEL_END_SLOT)
+ ix = ERTS_TW_SOON_WHEEL_FIRST_SLOT;
slots--;
}
+
+ ix = later_slot(tiw->later.pos);
+ tmp = skip_to_pos;
+ tmp &= ERTS_TW_LATER_WHEEL_POS_MASK;
+ if (tmp > tiw->later.pos) {
+ tmp -= tiw->later.pos;
+ tmp /= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ ERTS_TW_ASSERT(tmp >= 0);
+ if (tmp < (ErtsMonotonicTime) ERTS_TW_LATER_WHEEL_SIZE)
+ slots = (int) tmp;
+ else
+ slots = ERTS_TW_LATER_WHEEL_SIZE;
+
+ while (slots > 0) {
+ tmr = tiw->w[ix];
+ if (tmr) {
+ ErtsMonotonicTime tpos = tmr->timeout_pos;
+ ErtsTWheelTimer *end = tmr;
+ do {
+ tpos &= ERTS_TW_LATER_WHEEL_POS_MASK;
+ tpos -= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ ERTS_TW_ASSERT(tpos > skip_to_pos);
+ tmr = tmr->next;
+ } while (tmr != end);
+ }
+ ix++;
+ if (ix == ERTS_TW_LATER_WHEEL_END_SLOT)
+ ix = ERTS_TW_LATER_WHEEL_FIRST_SLOT;
+ slots--;
+ }
+ }
}
#endif
@@ -339,8 +580,8 @@ timeout_timer(ErtsTWheelTimer *p)
void
erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
{
- int tiw_pos_ix, slots, yielded_slot_restarted, yield_count;
- ErtsMonotonicTime bump_to, tmp_slots, old_pos;
+ int tiw_pos_ix, yielded_slot_restarted, yield_count, slots;
+ ErtsMonotonicTime bump_to;
ERTS_MSACC_PUSH_AND_SET_STATE_M_X(ERTS_MSACC_STATE_TIMERS);
yield_count = ERTS_TWHEEL_BUMP_YIELD_LIMIT;
@@ -350,13 +591,16 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
* where we left off when restarting after a yield.
*/
- if (tiw->yield_slot >= 0) {
+ if (tiw->yield_slot >= ERTS_TW_SOON_WHEEL_FIRST_SLOT) {
yielded_slot_restarted = 1;
+ bump_to = tiw->pos;
+ if (tiw->yield_slot >= ERTS_TW_LATER_WHEEL_FIRST_SLOT)
+ goto restart_yielded_later_slot;
tiw_pos_ix = tiw->yield_slot;
slots = tiw->yield_slots_left;
- bump_to = tiw->pos;
- old_pos = tiw->yield_start_pos;
- goto restart_yielded_slot;
+ ASSERT(0 <= slots && slots <= ERTS_TW_SOON_WHEEL_SIZE);
+ tiw->yield_slot = ERTS_TWHEEL_SLOT_INACTIVE;
+ goto restart_yielded_soon_slot;
}
do {
@@ -368,8 +612,6 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
while (1) {
ErtsTWheelTimer *p;
- old_pos = tiw->pos;
-
if (tiw->nto == 0) {
empty_wheel:
ERTS_DBG_CHK_SAFE_TO_SKIP_TO(tiw, bump_to);
@@ -383,12 +625,12 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
p = tiw->at_once.head;
while (p) {
- if (--yield_count <= 0) {
+ if (yield_count <= 0) {
ERTS_TW_ASSERT(tiw->nto > 0);
ERTS_TW_ASSERT(tiw->at_once.nto > 0);
tiw->yield_slot = ERTS_TWHEEL_SLOT_AT_ONCE;
tiw->true_next_timeout_time = 1;
- tiw->next_timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(old_pos);
+ tiw->next_timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(bump_to);
ERTS_MSACC_POP_STATE_M_X();
return;
}
@@ -405,6 +647,8 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
timeout_timer(p);
+ yield_count -= ERTS_TW_COST_TIMEOUT;
+
p = tiw->at_once.head;
}
@@ -433,22 +677,34 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
ERTS_DBG_CHK_SAFE_TO_SKIP_TO(tiw, skip_until_pos);
tiw->pos = skip_until_pos;
+
+ skip_until_pos++;
+ skip_until_pos &= ERTS_TW_LATER_WHEEL_POS_MASK;
+ if (tiw->later.pos < skip_until_pos)
+ tiw->later.pos = skip_until_pos;
}
}
- tiw_pos_ix = (int) ((tiw->pos+1) & (ERTS_TIW_SIZE-1));
- tmp_slots = (bump_to - tiw->pos);
- if (tmp_slots < (ErtsMonotonicTime) ERTS_TIW_SIZE)
- slots = (int) tmp_slots;
- else
- slots = ERTS_TIW_SIZE;
+ {
+ ErtsMonotonicTime tmp_slots = bump_to - tiw->pos;
+ tmp_slots = (bump_to - tiw->pos);
+ if (tmp_slots < ERTS_TW_SOON_WHEEL_SIZE)
+ slots = (int) tmp_slots;
+ else
+ slots = ERTS_TW_SOON_WHEEL_SIZE;
+ }
+ tiw_pos_ix = soon_slot(tiw->pos+1);
tiw->pos = bump_to;
- while (slots > 0) {
+ /* Timeout timers in soon wheel */
+ while (slots) {
+
+ yield_count -= ERTS_TW_COST_SLOT;
p = tiw->w[tiw_pos_ix];
if (p) {
+ /* timeout callback need tiw->pos to be up to date */
if (p->next == p) {
ERTS_TW_ASSERT(tiw->sentinel.next == &tiw->sentinel);
ERTS_TW_ASSERT(tiw->sentinel.prev == &tiw->sentinel);
@@ -463,18 +719,21 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
while (1) {
- if (p->timeout_pos > bump_to) {
- /* Very unusual case... */
- ++yield_count;
- insert_timer_into_slot(tiw, tiw_pos_ix, p);
- }
- else {
- /* Normal case... */
- timeout_timer(p);
- tiw->nto--;
- }
-
- restart_yielded_slot:
+ ERTS_TW_ASSERT(ERTS_TW_SOON_WHEEL_FIRST_SLOT <= p->slot
+ && p->slot < ERTS_TW_SOON_WHEEL_END_SLOT);
+ tiw->soon.nto--;
+ if (p->timeout_pos <= bump_to) {
+ timeout_timer(p);
+ tiw->nto--;
+ yield_count -= ERTS_TW_COST_TIMEOUT;
+ }
+ else {
+ /* uncommon case */
+ insert_timer_into_slot(tiw, tiw_pos_ix, p);
+ yield_count -= ERTS_TW_COST_SLOT_MOVE;
+ }
+
+ restart_yielded_soon_slot:
p = tiw->sentinel.next;
if (p == &tiw->sentinel) {
@@ -482,12 +741,11 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
break;
}
- if (--yield_count <= 0) {
+ if (yield_count <= 0) {
tiw->true_next_timeout_time = 1;
- tiw->next_timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(old_pos);
+ tiw->next_timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(bump_to);
tiw->yield_slot = tiw_pos_ix;
tiw->yield_slots_left = slots;
- tiw->yield_start_pos = old_pos;
ERTS_MSACC_POP_STATE_M_X();
return; /* Yield! */
}
@@ -496,16 +754,22 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
p->next->prev = &tiw->sentinel;
}
}
- tiw_pos_ix++;
- if (tiw_pos_ix == ERTS_TIW_SIZE)
- tiw_pos_ix = 0;
- slots--;
+
+ tiw_pos_ix++;
+ if (tiw_pos_ix == ERTS_TW_SOON_WHEEL_END_SLOT)
+ tiw_pos_ix = ERTS_TW_SOON_WHEEL_FIRST_SLOT;
+ slots--;
}
+
+ if (ERTS_TW_BUMP_LATER_WHEEL(tiw)) {
+ restart_yielded_later_slot:
+ if (bump_later_wheel(tiw, &yield_count))
+ return; /* Yield! */
+ }
}
} while (yielded_slot_restarted);
- tiw->yield_slot = ERTS_TWHEEL_SLOT_INACTIVE;
tiw->true_next_timeout_time = 0;
tiw->next_timeout_time = curr_time + ERTS_MONOTONIC_DAY;
@@ -514,6 +778,119 @@ erts_bump_timers(ErtsTimerWheel *tiw, ErtsMonotonicTime curr_time)
ERTS_MSACC_POP_STATE_M_X();
}
+static int
+bump_later_wheel(ErtsTimerWheel *tiw, int *ycount_p)
+{
+ ErtsMonotonicTime cpos = tiw->pos;
+ ErtsMonotonicTime later_pos = tiw->later.pos;
+ int ycount = *ycount_p;
+ int slots, fslot;
+
+ ERTS_HARD_DBG_CHK_WHEELS(tiw, 0);
+
+ if (tiw->yield_slot >= ERTS_TW_LATER_WHEEL_FIRST_SLOT) {
+ fslot = tiw->yield_slot;
+ slots = tiw->yield_slots_left;
+ ASSERT(0 <= slots && slots <= ERTS_TW_LATER_WHEEL_SIZE);
+ tiw->yield_slot = ERTS_TWHEEL_SLOT_INACTIVE;
+ goto restart_yielded_slot;
+ }
+ else {
+ ErtsMonotonicTime tmp_slots = cpos;
+ tmp_slots += ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ tmp_slots -= later_pos;
+ tmp_slots /= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ if (tmp_slots < ERTS_TW_LATER_WHEEL_SIZE)
+ slots = (int) tmp_slots;
+ else
+ slots = ERTS_TW_LATER_WHEEL_SIZE;
+ }
+
+ while (slots >= 0) {
+ ErtsTWheelTimer *p;
+
+ fslot = later_slot(later_pos);
+
+ ycount -= ERTS_TW_COST_SLOT;
+
+ p = tiw->w[fslot];
+
+ if (p) {
+
+ if (p->next == p) {
+ ERTS_TW_ASSERT(tiw->sentinel.next == &tiw->sentinel);
+ ERTS_TW_ASSERT(tiw->sentinel.prev == &tiw->sentinel);
+ }
+ else {
+ tiw->sentinel.next = p->next;
+ tiw->sentinel.prev = p->prev;
+ tiw->sentinel.next->prev = &tiw->sentinel;
+ tiw->sentinel.prev->next = &tiw->sentinel;
+ }
+ tiw->w[fslot] = NULL;
+
+ while (1) {
+ ErtsMonotonicTime tpos = p->timeout_pos;
+
+ ERTS_TW_ASSERT(tpos >= later_pos);
+ ERTS_TW_ASSERT(p->slot == fslot);
+
+ if (tpos >= later_pos + ERTS_TW_LATER_WHEEL_SLOT_SIZE) {
+ /* keep in later slot; very uncommon... */
+ insert_timer_into_slot(tiw, fslot, p);
+ ycount -= ERTS_TW_COST_SLOT_MOVE;
+ }
+ else {
+ ERTS_TW_ASSERT(tpos < cpos + ERTS_TW_SOON_WHEEL_SIZE);
+ if (tpos > cpos) {
+ /* move into soon wheel */
+ insert_timer_into_slot(tiw, soon_slot(tpos), p);
+ ycount -= ERTS_TW_COST_SLOT_MOVE;
+ }
+ else {
+ /* trigger at once */
+ timeout_timer(p);
+ tiw->nto--;
+ ycount -= ERTS_TW_COST_TIMEOUT;
+ }
+ }
+
+ restart_yielded_slot:
+
+ p = tiw->sentinel.next;
+ if (p == &tiw->sentinel) {
+ ERTS_TW_ASSERT(tiw->sentinel.prev == &tiw->sentinel);
+ break;
+ }
+
+ if (ycount < 0) {
+ tiw->later.pos = later_pos;
+ tiw->true_next_timeout_time = 1;
+ tiw->next_timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(cpos);
+ tiw->yield_slot = fslot;
+ tiw->yield_slots_left = slots;
+ *ycount_p = 0;
+ ERTS_HARD_DBG_CHK_WHEELS(tiw, 0);
+ return 1; /* Yield! */
+ }
+
+ tiw->sentinel.next = p->next;
+ p->next->prev = &tiw->sentinel;
+ }
+ }
+ slots--;
+ later_pos += ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ }
+
+ ERTS_HARD_DBG_CHK_WHEELS(tiw, 0);
+
+ tiw->later.pos = later_pos;
+
+ *ycount_p = ycount;
+
+ return 0;
+}
+
Uint
erts_timer_wheel_memory_size(void)
{
@@ -524,11 +901,11 @@ ErtsTimerWheel *
erts_create_timer_wheel(ErtsSchedulerData *esdp)
{
ErtsMonotonicTime mtime;
- int i;
+ int i = ERTS_TW_SOON_WHEEL_FIRST_SLOT;
ErtsTimerWheel *tiw;
tiw = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_TIMER_WHEEL,
sizeof(ErtsTimerWheel));
- for(i = 0; i < ERTS_TIW_SIZE; i++)
+ for(; i < ERTS_TW_LATER_WHEEL_END_SLOT; i++)
tiw->w[i] = NULL;
mtime = erts_get_monotonic_time(esdp);
@@ -537,6 +914,10 @@ erts_create_timer_wheel(ErtsSchedulerData *esdp)
tiw->at_once.head = NULL;
tiw->at_once.tail = NULL;
tiw->at_once.nto = 0;
+ tiw->soon.nto = 0;
+ tiw->later.pos = tiw->pos;
+ tiw->later.pos &= ERTS_TW_LATER_WHEEL_POS_MASK;
+ tiw->later.pos += ERTS_TW_LATER_WHEEL_SLOT_SIZE;
tiw->yield_slot = ERTS_TWHEEL_SLOT_INACTIVE;
tiw->true_next_timeout_time = 0;
tiw->next_timeout_time = mtime + ERTS_MONOTONIC_DAY;
@@ -586,36 +967,40 @@ erts_twheel_set_timer(ErtsTimerWheel *tiw,
ERTS_TW_ASSERT(p->slot == ERTS_TWHEEL_SLOT_INACTIVE);
+ tiw->nto++;
if (timeout_pos <= tiw->pos) {
- tiw->nto++;
- tiw->at_once.nto++;
- p->next = NULL;
- p->prev = tiw->at_once.tail;
- if (tiw->at_once.tail) {
- ERTS_TW_ASSERT(tiw->at_once.head);
- tiw->at_once.tail->next = p;
- }
- else {
- ERTS_TW_ASSERT(!tiw->at_once.head);
- tiw->at_once.head = p;
- }
- tiw->at_once.tail = p;
- p->timeout_pos = tiw->pos;
- p->slot = ERTS_TWHEEL_SLOT_AT_ONCE;
+ p->timeout_pos = tiw->pos;
+ insert_timer_into_at_once_list(tiw, p);
timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(tiw->pos);
}
else {
int slot;
+ p->timeout_pos = timeout_pos;
+
/* calculate slot */
- slot = (int) (timeout_pos & (ERTS_TIW_SIZE-1));
+ if (timeout_pos < tiw->pos + ERTS_TW_SOON_WHEEL_SIZE) {
+ /* soon wheel */
+ slot = soon_slot(timeout_pos);
+ }
+ else {
+ /* later wheel */
+ slot = later_slot(timeout_pos);
+
+ /*
+ * Next timeout due to this timeout
+ * should be in good time before the
+ * actual timeout (one later wheel slot
+ * size). This, in order to move it
+ * from the later wheel to the soon
+ * wheel.
+ */
+ timeout_pos &= ERTS_TW_LATER_WHEEL_POS_MASK;
+ timeout_pos -= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ }
insert_timer_into_slot(tiw, slot, p);
-
- tiw->nto++;
-
- timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(timeout_pos);
- p->timeout_pos = timeout_pos;
+ timeout_time = ERTS_CLKTCKS_TO_MONOTONIC(timeout_pos);
}
if (timeout_time < tiw->next_timeout_time) {
@@ -631,6 +1016,7 @@ erts_twheel_cancel_timer(ErtsTimerWheel *tiw, ErtsTWheelTimer *p)
if (p->slot != ERTS_TWHEEL_SLOT_INACTIVE) {
ERTS_MSACC_PUSH_AND_SET_STATE_M_X(ERTS_MSACC_STATE_TIMERS);
remove_timer(tiw, p);
+ tiw->nto--;
ERTS_MSACC_POP_STATE_M_X();
}
}
@@ -658,7 +1044,9 @@ erts_twheel_debug_foreach(ErtsTimerWheel *tiw,
(*func)(arg, tmr->timeout_pos, tmr->arg);
}
- for (ix = 0; ix < ERTS_TIW_SIZE; ix++) {
+ for (ix = ERTS_TW_SOON_WHEEL_FIRST_SLOT;
+ ix < ERTS_TW_LATER_WHEEL_END_SLOT;
+ ix++) {
tmr = tiw->w[ix];
if (tmr) {
do {
@@ -670,36 +1058,92 @@ erts_twheel_debug_foreach(ErtsTimerWheel *tiw,
}
}
-#ifdef ERTS_TW_DEBUG
-void erts_p_slpq(void)
+#ifdef ERTS_TW_HARD_DEBUG
+
+static void
+hrd_dbg_check_wheels(ErtsTimerWheel *tiw, int check_min_tpos)
{
- erts_printf("Not yet implemented...\n");
-#if 0
- ErtsMonotonicTime current_time = erts_get_monotonic_time(NULL);
- int i;
- ErtsTWheelTimer* p;
-
- /* print the whole wheel, starting at the current position */
- erts_printf("\ncurrent time = %bps tiw_pos = %d tiw_nto %d\n",
- current_time, tiw->pos, tiw->nto);
- i = tiw->pos;
- if (tiw->w[i] != NULL) {
- erts_printf("%d:\n", i);
- for(p = tiw->w[i]; p != NULL; p = p->next) {
- erts_printf(" (timeout time %bps, slot %d)\n",
- ERTS_CLKTCKS_TO_MONOTONIC(p->timeout_pos),
- p->slot);
- }
+ int ix, soon_tmo, later_tmo, at_once_tmo;
+ ErtsMonotonicTime min_tpos;
+
+ min_tpos = ERTS_MONOTONIC_TO_CLKTCKS(tiw->next_timeout_time);
+
+ soon_tmo = 0;
+ for (ix = ERTS_TW_SOON_WHEEL_FIRST_SLOT;
+ ix < ERTS_TW_SOON_WHEEL_END_SLOT;
+ ix++) {
+ ErtsTWheelTimer *p;
+
+ p = tiw->w[ix];
+ if (p) {
+ ErtsTWheelTimer *first = p;
+ do {
+ ErtsMonotonicTime tpos = p->timeout_pos;
+ ERTS_TW_ASSERT(p->slot == ix);
+ soon_tmo++;
+ ERTS_TW_ASSERT(ix == soon_slot(tpos));
+ ERTS_TW_ASSERT(p->timeout_pos < tiw->pos + ERTS_TW_SOON_WHEEL_SIZE);
+ ERTS_TW_ASSERT(!check_min_tpos || tpos >= min_tpos);
+ ERTS_TW_ASSERT(p->next->prev == p);
+ p = p->next;
+ } while (p != first);
+ }
}
- for(i = ((i+1) & (ERTS_TIW_SIZE-1)); i != (tiw->pos & (ERTS_TIW_SIZE-1)); i = ((i+1) & (ERTS_TIW_SIZE-1))) {
- if (tiw->w[i] != NULL) {
- erts_printf("%d:\n", i);
- for(p = tiw->w[i]; p != NULL; p = p->next) {
- erts_printf(" (timeout time %bps, slot %d)\n",
- ERTS_CLKTCKS_TO_MONOTONIC(p->timeout_pos), p->slot);
- }
- }
+
+ later_tmo = 0;
+ for (ix = ERTS_TW_LATER_WHEEL_FIRST_SLOT;
+ ix < ERTS_TW_LATER_WHEEL_END_SLOT;
+ ix++) {
+ ErtsTWheelTimer *p;
+
+ p = tiw->w[ix];
+ if (p) {
+ ErtsTWheelTimer *first = p;
+ do {
+ ErtsMonotonicTime tpos = p->timeout_pos;
+ ERTS_TW_ASSERT(p->slot == ix);
+ later_tmo++;
+ ERTS_TW_ASSERT(later_slot(tpos) == ix);
+ tpos &= ERTS_TW_LATER_WHEEL_POS_MASK;
+ tpos -= ERTS_TW_LATER_WHEEL_SLOT_SIZE;
+ ERTS_TW_ASSERT(!check_min_tpos || tpos >= min_tpos);
+ ERTS_TW_ASSERT(p->next->prev == p);
+ p = p->next;
+ } while (p != first);
+ }
}
-#endif
+
+ if (tiw->yield_slot >= 0) {
+ ErtsTWheelTimer *p = tiw->sentinel.next;
+ while (p != &tiw->sentinel) {
+ ErtsMonotonicTime tpos = p->timeout_pos;
+ if (tiw->yield_slot >= ERTS_TW_SOON_WHEEL_SIZE) {
+ later_tmo++;
+ ERTS_TW_ASSERT(p->slot == later_slot(tpos));
+ }
+ else {
+ soon_tmo++;
+ ERTS_TW_ASSERT(p->slot == (tpos & ERTS_TW_SOON_WHEEL_MASK));
+ ERTS_TW_ASSERT(tpos < tiw->pos + ERTS_TW_SOON_WHEEL_SIZE);
+ }
+ p = p->next;
+ }
+ }
+
+ at_once_tmo = 0;
+ if (tiw->at_once.head) {
+ ErtsTWheelTimer *p = tiw->at_once.head;
+ while (p) {
+ ErtsMonotonicTime tpos = p->timeout_pos;
+ at_once_tmo++;
+ ERTS_TW_ASSERT(tpos <= tiw->pos);
+ p = p->next;
+ }
+ }
+
+ ERTS_TW_ASSERT(tiw->at_once.nto == at_once_tmo);
+ ERTS_TW_ASSERT(tiw->soon.nto == soon_tmo);
+ ERTS_TW_ASSERT(tiw->nto == soon_tmo + later_tmo + at_once_tmo);
}
-#endif /* ERTS_TW_DEBUG */
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-13 11:21:40 +0000