#include <kern/thread_call.h>
#include <kern/call_entry.h>
-
#include <kern/timer_call.h>
+#include <libkern/OSAtomic.h>
+
#include <sys/kdebug.h>
-static zone_t thread_call_zone;
+static zone_t thread_call_zone;
+static struct wait_queue daemon_wqueue;
struct thread_call_group {
queue_head_t pending_queue;
uint32_t pending_count;
queue_head_t delayed_queue;
+ uint32_t delayed_count;
timer_call_data_t delayed_timer;
+ timer_call_data_t dealloc_timer;
struct wait_queue idle_wqueue;
- struct wait_queue daemon_wqueue;
uint32_t idle_count, active_count;
-};
-
-typedef struct thread_call_group *thread_call_group_t;
-
-static struct thread_call_group thread_call_group0;
-
-static boolean_t thread_call_daemon_awake;
-
-#define thread_call_thread_min 4
-
-#define internal_call_count 768
-
-static thread_call_data_t internal_call_storage[internal_call_count];
-static queue_head_t thread_call_internal_queue;
-
-static __inline__ thread_call_t _internal_call_allocate(void);
-
-static __inline__ void _internal_call_release(
- thread_call_t call);
-static __inline__ boolean_t _pending_call_enqueue(
- thread_call_t call,
- thread_call_group_t group),
- _delayed_call_enqueue(
- thread_call_t call,
- thread_call_group_t group,
- uint64_t deadline),
- _call_dequeue(
- thread_call_t call,
- thread_call_group_t group);
+ integer_t pri;
+ uint32_t target_thread_count;
+ uint64_t idle_timestamp;
-static __inline__ void thread_call_wake(
- thread_call_group_t group);
-
-static __inline__ void _set_delayed_call_timer(
- thread_call_t call,
- thread_call_group_t group);
-
-static boolean_t _remove_from_pending_queue(
- thread_call_func_t func,
- thread_call_param_t param0,
- boolean_t remove_all),
- _remove_from_delayed_queue(
- thread_call_func_t func,
- thread_call_param_t param0,
- boolean_t remove_all);
+ uint32_t flags;
+ sched_call_t sched_call;
+};
-static void thread_call_daemon(
- thread_call_group_t group),
- thread_call_thread(
- thread_call_group_t group);
+typedef struct thread_call_group *thread_call_group_t;
-extern void thread_call_delayed_timer(
- timer_call_param_t p0,
- timer_call_param_t p1);
+#define TCG_PARALLEL 0x01
+#define TCG_DEALLOC_ACTIVE 0x02
+
+#define THREAD_CALL_GROUP_COUNT 4
+#define THREAD_CALL_THREAD_MIN 4
+#define INTERNAL_CALL_COUNT 768
+#define THREAD_CALL_DEALLOC_INTERVAL_NS (5 * 1000 * 1000) /* 5 ms */
+#define THREAD_CALL_ADD_RATIO 4
+#define THREAD_CALL_MACH_FACTOR_CAP 3
+
+static struct thread_call_group thread_call_groups[THREAD_CALL_GROUP_COUNT];
+static boolean_t thread_call_daemon_awake;
+static thread_call_data_t internal_call_storage[INTERNAL_CALL_COUNT];
+static queue_head_t thread_call_internal_queue;
+static uint64_t thread_call_dealloc_interval_abs;
+
+static __inline__ thread_call_t _internal_call_allocate(void);
+static __inline__ void _internal_call_release(thread_call_t call);
+static __inline__ boolean_t _pending_call_enqueue(thread_call_t call, thread_call_group_t group);
+static __inline__ boolean_t _delayed_call_enqueue(thread_call_t call, thread_call_group_t group, uint64_t deadline);
+static __inline__ boolean_t _call_dequeue(thread_call_t call, thread_call_group_t group);
+static __inline__ void thread_call_wake(thread_call_group_t group);
+static __inline__ void _set_delayed_call_timer(thread_call_t call, thread_call_group_t group);
+static boolean_t _remove_from_pending_queue(thread_call_func_t func, thread_call_param_t param0, boolean_t remove_all);
+static boolean_t _remove_from_delayed_queue(thread_call_func_t func, thread_call_param_t param0, boolean_t remove_all);
+static void thread_call_daemon(void *arg);
+static void thread_call_thread(thread_call_group_t group, wait_result_t wres);
+extern void thread_call_delayed_timer(timer_call_param_t p0, timer_call_param_t p1);
+static void thread_call_dealloc_timer(timer_call_param_t p0, timer_call_param_t p1);
+static void thread_call_group_setup(thread_call_group_t group, thread_call_priority_t pri, uint32_t target_thread_count, boolean_t parallel);
+static void sched_call_thread(int type, thread_t thread);
+static void thread_call_start_deallocate_timer(thread_call_group_t group);
+static void thread_call_wait_locked(thread_call_t call);
#define qe(x) ((queue_entry_t)(x))
#define TC(x) ((thread_call_t)(x))
lck_spin_t thread_call_lock_data;
#endif
+
#define thread_call_lock_spin() \
lck_mtx_lock_spin_always(&thread_call_lock_data)
lck_mtx_unlock_always(&thread_call_lock_data)
+static inline spl_t
+disable_ints_and_lock(void)
+{
+ spl_t s;
+
+ s = splsched();
+ thread_call_lock_spin();
+
+ return s;
+}
+
+static inline void
+enable_ints_and_unlock(void)
+{
+ thread_call_unlock();
+ (void)spllo();
+}
+
+
+static inline boolean_t
+group_isparallel(thread_call_group_t group)
+{
+ return ((group->flags & TCG_PARALLEL) != 0);
+}
+
+static boolean_t
+thread_call_group_should_add_thread(thread_call_group_t group)
+{
+ uint32_t thread_count;
+
+ if (!group_isparallel(group)) {
+ if (group->pending_count > 0 && group->active_count == 0) {
+ return TRUE;
+ }
+
+ return FALSE;
+ }
+
+ if (group->pending_count > 0) {
+ if (group->idle_count > 0) {
+ panic("Pending work, but threads are idle?");
+ }
+
+ thread_count = group->active_count;
+
+ /*
+ * Add a thread if either there are no threads,
+ * the group has fewer than its target number of
+ * threads, or the amount of work is large relative
+ * to the number of threads. In the last case, pay attention
+ * to the total load on the system, and back off if
+ * it's high.
+ */
+ if ((thread_count == 0) ||
+ (thread_count < group->target_thread_count) ||
+ ((group->pending_count > THREAD_CALL_ADD_RATIO * thread_count) &&
+ (sched_mach_factor < THREAD_CALL_MACH_FACTOR_CAP))) {
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+static inline integer_t
+thread_call_priority_to_sched_pri(thread_call_priority_t pri)
+{
+ switch (pri) {
+ case THREAD_CALL_PRIORITY_HIGH:
+ return BASEPRI_PREEMPT;
+ case THREAD_CALL_PRIORITY_KERNEL:
+ return BASEPRI_KERNEL;
+ case THREAD_CALL_PRIORITY_USER:
+ return BASEPRI_DEFAULT;
+ case THREAD_CALL_PRIORITY_LOW:
+ return DEPRESSPRI;
+ default:
+ panic("Invalid priority.");
+ }
+
+ return 0;
+}
+
+/* Lock held */
+static inline thread_call_group_t
+thread_call_get_group(
+ thread_call_t call)
+{
+ thread_call_priority_t pri = call->tc_pri;
+
+ assert(pri == THREAD_CALL_PRIORITY_LOW ||
+ pri == THREAD_CALL_PRIORITY_USER ||
+ pri == THREAD_CALL_PRIORITY_KERNEL ||
+ pri == THREAD_CALL_PRIORITY_HIGH);
+
+ return &thread_call_groups[pri];
+}
+
+static void
+thread_call_group_setup(
+ thread_call_group_t group,
+ thread_call_priority_t pri,
+ uint32_t target_thread_count,
+ boolean_t parallel)
+{
+ queue_init(&group->pending_queue);
+ queue_init(&group->delayed_queue);
+
+ timer_call_setup(&group->delayed_timer, thread_call_delayed_timer, group);
+ timer_call_setup(&group->dealloc_timer, thread_call_dealloc_timer, group);
+
+ wait_queue_init(&group->idle_wqueue, SYNC_POLICY_FIFO);
+
+ group->target_thread_count = target_thread_count;
+ group->pri = thread_call_priority_to_sched_pri(pri);
+
+ group->sched_call = sched_call_thread;
+ if (parallel) {
+ group->flags |= TCG_PARALLEL;
+ group->sched_call = NULL;
+ }
+}
+
+/*
+ * Simple wrapper for creating threads bound to
+ * thread call groups.
+ */
+static kern_return_t
+thread_call_thread_create(
+ thread_call_group_t group)
+{
+ thread_t thread;
+ kern_return_t result;
+
+ result = kernel_thread_start_priority((thread_continue_t)thread_call_thread, group, group->pri, &thread);
+ if (result != KERN_SUCCESS) {
+ return result;
+ }
+
+ if (group->pri < BASEPRI_PREEMPT) {
+ /*
+ * New style doesn't get to run to completion in
+ * kernel if there are higher priority threads
+ * available.
+ */
+ thread_set_eager_preempt(thread);
+ }
+
+ thread_deallocate(thread);
+ return KERN_SUCCESS;
+}
+
/*
* thread_call_initialize:
*
thread_call_initialize(void)
{
thread_call_t call;
- thread_call_group_t group = &thread_call_group0;
kern_return_t result;
- thread_t thread;
- int i;
- spl_t s;
+ thread_t thread;
+ int i;
i = sizeof (thread_call_data_t);
thread_call_zone = zinit(i, 4096 * i, 16 * i, "thread_call");
#else
lck_spin_init(&thread_call_lock_data, &thread_call_lck_grp, &thread_call_lck_attr);
#endif
- queue_init(&group->pending_queue);
- queue_init(&group->delayed_queue);
- s = splsched();
- thread_call_lock_spin();
+ nanotime_to_absolutetime(0, THREAD_CALL_DEALLOC_INTERVAL_NS, &thread_call_dealloc_interval_abs);
+ wait_queue_init(&daemon_wqueue, SYNC_POLICY_FIFO);
- timer_call_setup(&group->delayed_timer, thread_call_delayed_timer, group);
+ thread_call_group_setup(&thread_call_groups[THREAD_CALL_PRIORITY_LOW], THREAD_CALL_PRIORITY_LOW, 0, TRUE);
+ thread_call_group_setup(&thread_call_groups[THREAD_CALL_PRIORITY_USER], THREAD_CALL_PRIORITY_USER, 0, TRUE);
+ thread_call_group_setup(&thread_call_groups[THREAD_CALL_PRIORITY_KERNEL], THREAD_CALL_PRIORITY_KERNEL, 1, TRUE);
+ thread_call_group_setup(&thread_call_groups[THREAD_CALL_PRIORITY_HIGH], THREAD_CALL_PRIORITY_HIGH, THREAD_CALL_THREAD_MIN, FALSE);
- wait_queue_init(&group->idle_wqueue, SYNC_POLICY_FIFO);
- wait_queue_init(&group->daemon_wqueue, SYNC_POLICY_FIFO);
+ disable_ints_and_lock();
queue_init(&thread_call_internal_queue);
for (
- call = internal_call_storage;
- call < &internal_call_storage[internal_call_count];
+ call = internal_call_storage;
+ call < &internal_call_storage[INTERNAL_CALL_COUNT];
call++) {
enqueue_tail(&thread_call_internal_queue, qe(call));
thread_call_daemon_awake = TRUE;
- thread_call_unlock();
- splx(s);
+ enable_ints_and_unlock();
- result = kernel_thread_start_priority((thread_continue_t)thread_call_daemon, group, BASEPRI_PREEMPT + 1, &thread);
+ result = kernel_thread_start_priority((thread_continue_t)thread_call_daemon, NULL, BASEPRI_PREEMPT + 1, &thread);
if (result != KERN_SUCCESS)
panic("thread_call_initialize");
thread_call_func_t func,
thread_call_param_t param0)
{
- call_entry_setup(call, func, param0);
+ bzero(call, sizeof(*call));
+ call_entry_setup((call_entry_t)call, func, param0);
+ call->tc_pri = THREAD_CALL_PRIORITY_HIGH; /* Default priority */
}
/*
thread_call_t call)
{
if ( call >= internal_call_storage &&
- call < &internal_call_storage[internal_call_count] )
+ call < &internal_call_storage[INTERNAL_CALL_COUNT] )
enqueue_head(&thread_call_internal_queue, qe(call));
}
{
queue_head_t *old_queue;
- old_queue = call_entry_enqueue_tail(call, &group->pending_queue);
+ old_queue = call_entry_enqueue_tail(CE(call), &group->pending_queue);
+
+ if (old_queue == NULL) {
+ call->tc_submit_count++;
+ }
group->pending_count++;
+ thread_call_wake(group);
+
return (old_queue != NULL);
}
*/
static __inline__ boolean_t
_delayed_call_enqueue(
- thread_call_t call,
+ thread_call_t call,
thread_call_group_t group,
uint64_t deadline)
{
queue_head_t *old_queue;
- old_queue = call_entry_enqueue_deadline(call, &group->delayed_queue, deadline);
+ old_queue = call_entry_enqueue_deadline(CE(call), &group->delayed_queue, deadline);
if (old_queue == &group->pending_queue)
group->pending_count--;
+ else if (old_queue == NULL)
+ call->tc_submit_count++;
return (old_queue != NULL);
}
{
queue_head_t *old_queue;
- old_queue = call_entry_dequeue(call);
+ old_queue = call_entry_dequeue(CE(call));
- if (old_queue == &group->pending_queue)
- group->pending_count--;
+ if (old_queue != NULL) {
+ call->tc_finish_count++;
+ if (old_queue == &group->pending_queue)
+ group->pending_count--;
+ }
return (old_queue != NULL);
}
thread_call_t call,
thread_call_group_t group)
{
- timer_call_enter(&group->delayed_timer, call->deadline, 0);
+ timer_call_enter(&group->delayed_timer, call->tc_call.deadline, 0);
}
/*
thread_call_param_t param0,
boolean_t remove_all)
{
- boolean_t call_removed = FALSE;
+ boolean_t call_removed = FALSE;
thread_call_t call;
- thread_call_group_t group = &thread_call_group0;
-
- call = TC(queue_first(&group->pending_queue));
-
- while (!queue_end(&group->pending_queue, qe(call))) {
- if ( call->func == func &&
- call->param0 == param0 ) {
+ thread_call_group_t group = &thread_call_groups[THREAD_CALL_PRIORITY_HIGH];
+
+ call = TC(queue_first(&group->pending_queue));
+
+ while (!queue_end(&group->pending_queue, qe(call))) {
+ if (call->tc_call.func == func &&
+ call->tc_call.param0 == param0) {
thread_call_t next = TC(queue_next(qe(call)));
-
+
_call_dequeue(call, group);
_internal_call_release(call);
-
+
call_removed = TRUE;
if (!remove_all)
break;
-
+
call = next;
}
else
call = TC(queue_next(qe(call)));
- }
-
- return (call_removed);
+ }
+
+ return (call_removed);
}
/*
thread_call_param_t param0,
boolean_t remove_all)
{
- boolean_t call_removed = FALSE;
- thread_call_t call;
- thread_call_group_t group = &thread_call_group0;
-
- call = TC(queue_first(&group->delayed_queue));
-
- while (!queue_end(&group->delayed_queue, qe(call))) {
- if ( call->func == func &&
- call->param0 == param0 ) {
+ boolean_t call_removed = FALSE;
+ thread_call_t call;
+ thread_call_group_t group = &thread_call_groups[THREAD_CALL_PRIORITY_HIGH];
+
+ call = TC(queue_first(&group->delayed_queue));
+
+ while (!queue_end(&group->delayed_queue, qe(call))) {
+ if (call->tc_call.func == func &&
+ call->tc_call.param0 == param0) {
thread_call_t next = TC(queue_next(qe(call)));
-
+
_call_dequeue(call, group);
-
+
_internal_call_release(call);
-
+
call_removed = TRUE;
if (!remove_all)
break;
-
+
call = next;
}
else
call = TC(queue_next(qe(call)));
- }
-
- return (call_removed);
+ }
+
+ return (call_removed);
}
#ifndef __LP64__
thread_call_param_t param,
boolean_t unique_call)
{
- thread_call_t call;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
-
- s = splsched();
- thread_call_lock_spin();
-
- call = TC(queue_first(&group->pending_queue));
-
+ thread_call_t call;
+ thread_call_group_t group = &thread_call_groups[THREAD_CALL_PRIORITY_HIGH];
+ spl_t s;
+
+ s = splsched();
+ thread_call_lock_spin();
+
+ call = TC(queue_first(&group->pending_queue));
+
while (unique_call && !queue_end(&group->pending_queue, qe(call))) {
- if ( call->func == func &&
- call->param0 == param ) {
+ if (call->tc_call.func == func && call->tc_call.param0 == param) {
break;
}
-
+
call = TC(queue_next(qe(call)));
- }
-
- if (!unique_call || queue_end(&group->pending_queue, qe(call))) {
+ }
+
+ if (!unique_call || queue_end(&group->pending_queue, qe(call))) {
call = _internal_call_allocate();
- call->func = func;
- call->param0 = param;
- call->param1 = NULL;
-
+ call->tc_call.func = func;
+ call->tc_call.param0 = param;
+ call->tc_call.param1 = NULL;
+
_pending_call_enqueue(call, group);
-
- if (group->active_count == 0)
- thread_call_wake(group);
- }
+ }
- thread_call_unlock();
- splx(s);
+ thread_call_unlock();
+ splx(s);
}
#endif /* __LP64__ */
*/
void
thread_call_func_delayed(
- thread_call_func_t func,
- thread_call_param_t param,
- uint64_t deadline)
+ thread_call_func_t func,
+ thread_call_param_t param,
+ uint64_t deadline)
{
- thread_call_t call;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
-
- s = splsched();
- thread_call_lock_spin();
-
- call = _internal_call_allocate();
- call->func = func;
- call->param0 = param;
- call->param1 = 0;
-
- _delayed_call_enqueue(call, group, deadline);
-
- if (queue_first(&group->delayed_queue) == qe(call))
- _set_delayed_call_timer(call, group);
-
- thread_call_unlock();
- splx(s);
+ thread_call_t call;
+ thread_call_group_t group = &thread_call_groups[THREAD_CALL_PRIORITY_HIGH];
+ spl_t s;
+
+ s = splsched();
+ thread_call_lock_spin();
+
+ call = _internal_call_allocate();
+ call->tc_call.func = func;
+ call->tc_call.param0 = param;
+ call->tc_call.param1 = 0;
+
+ _delayed_call_enqueue(call, group, deadline);
+
+ if (queue_first(&group->delayed_queue) == qe(call))
+ _set_delayed_call_timer(call, group);
+
+ thread_call_unlock();
+ splx(s);
}
/*
*/
boolean_t
thread_call_func_cancel(
- thread_call_func_t func,
- thread_call_param_t param,
- boolean_t cancel_all)
+ thread_call_func_t func,
+ thread_call_param_t param,
+ boolean_t cancel_all)
{
- boolean_t result;
- spl_t s;
-
- s = splsched();
- thread_call_lock_spin();
+ boolean_t result;
+ spl_t s;
- if (cancel_all)
+ s = splsched();
+ thread_call_lock_spin();
+
+ if (cancel_all)
result = _remove_from_pending_queue(func, param, cancel_all) |
- _remove_from_delayed_queue(func, param, cancel_all);
+ _remove_from_delayed_queue(func, param, cancel_all);
else
result = _remove_from_pending_queue(func, param, cancel_all) ||
- _remove_from_delayed_queue(func, param, cancel_all);
-
- thread_call_unlock();
- splx(s);
+ _remove_from_delayed_queue(func, param, cancel_all);
+
+ thread_call_unlock();
+ splx(s);
return (result);
}
+/*
+ * Allocate a thread call with a given priority. Importances
+ * other than THREAD_CALL_PRIORITY_HIGH will be run in threads
+ * with eager preemption enabled (i.e. may be aggressively preempted
+ * by higher-priority threads which are not in the normal "urgent" bands).
+ */
+thread_call_t
+thread_call_allocate_with_priority(
+ thread_call_func_t func,
+ thread_call_param_t param0,
+ thread_call_priority_t pri)
+{
+ thread_call_t call;
+
+ if (pri > THREAD_CALL_PRIORITY_LOW) {
+ panic("Invalid pri: %d\n", pri);
+ }
+
+ call = thread_call_allocate(func, param0);
+ call->tc_pri = pri;
+
+ return call;
+}
+
/*
* thread_call_allocate:
*
*/
thread_call_t
thread_call_allocate(
- thread_call_func_t func,
- thread_call_param_t param0)
+ thread_call_func_t func,
+ thread_call_param_t param0)
{
- thread_call_t call = zalloc(thread_call_zone);
+ thread_call_t call = zalloc(thread_call_zone);
- call_entry_setup(call, func, param0);
+ thread_call_setup(call, func, param0);
+ call->tc_refs = 1;
+ call->tc_flags = THREAD_CALL_ALLOC;
- return (call);
+ return (call);
}
/*
* thread_call_free:
*
- * Free a callout entry.
+ * Release a callout. If the callout is currently
+ * executing, it will be freed when all invocations
+ * finish.
*/
boolean_t
thread_call_free(
- thread_call_t call)
+ thread_call_t call)
{
- spl_t s;
-
- s = splsched();
- thread_call_lock_spin();
-
- if (call->queue != NULL) {
- thread_call_unlock();
- splx(s);
+ spl_t s;
+ int32_t refs;
- return (FALSE);
- }
-
- thread_call_unlock();
- splx(s);
-
- zfree(thread_call_zone, call);
+ s = splsched();
+ thread_call_lock_spin();
+
+ if (call->tc_call.queue != NULL) {
+ thread_call_unlock();
+ splx(s);
+
+ return (FALSE);
+ }
+
+ refs = --call->tc_refs;
+ if (refs < 0) {
+ panic("Refcount negative: %d\n", refs);
+ }
+
+ thread_call_unlock();
+ splx(s);
+
+ if (refs == 0) {
+ zfree(thread_call_zone, call);
+ }
return (TRUE);
}
*/
boolean_t
thread_call_enter(
- thread_call_t call)
+ thread_call_t call)
{
- boolean_t result = TRUE;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
-
+ boolean_t result = TRUE;
+ thread_call_group_t group;
+ spl_t s;
+
+ group = thread_call_get_group(call);
+
s = splsched();
thread_call_lock_spin();
-
- if (call->queue != &group->pending_queue) {
- result = _pending_call_enqueue(call, group);
-
- if (group->active_count == 0)
- thread_call_wake(group);
+
+ if (call->tc_call.queue != &group->pending_queue) {
+ result = _pending_call_enqueue(call, group);
}
- call->param1 = 0;
+ call->tc_call.param1 = 0;
thread_call_unlock();
splx(s);
boolean_t
thread_call_enter1(
- thread_call_t call,
- thread_call_param_t param1)
+ thread_call_t call,
+ thread_call_param_t param1)
{
- boolean_t result = TRUE;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
-
+ boolean_t result = TRUE;
+ thread_call_group_t group;
+ spl_t s;
+
+ group = thread_call_get_group(call);
+
s = splsched();
thread_call_lock_spin();
-
- if (call->queue != &group->pending_queue) {
- result = _pending_call_enqueue(call, group);
-
- if (group->active_count == 0)
- thread_call_wake(group);
+
+ if (call->tc_call.queue != &group->pending_queue) {
+ result = _pending_call_enqueue(call, group);
}
- call->param1 = param1;
+ call->tc_call.param1 = param1;
thread_call_unlock();
splx(s);
*/
boolean_t
thread_call_enter_delayed(
- thread_call_t call,
- uint64_t deadline)
+ thread_call_t call,
+ uint64_t deadline)
{
- boolean_t result = TRUE;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
+ boolean_t result = TRUE;
+ thread_call_group_t group;
+ spl_t s;
+
+ group = thread_call_get_group(call);
s = splsched();
thread_call_lock_spin();
if (queue_first(&group->delayed_queue) == qe(call))
_set_delayed_call_timer(call, group);
- call->param1 = 0;
+ call->tc_call.param1 = 0;
thread_call_unlock();
splx(s);
boolean_t
thread_call_enter1_delayed(
- thread_call_t call,
- thread_call_param_t param1,
- uint64_t deadline)
+ thread_call_t call,
+ thread_call_param_t param1,
+ uint64_t deadline)
{
- boolean_t result = TRUE;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
+ boolean_t result = TRUE;
+ thread_call_group_t group;
+ spl_t s;
+
+ group = thread_call_get_group(call);
s = splsched();
thread_call_lock_spin();
if (queue_first(&group->delayed_queue) == qe(call))
_set_delayed_call_timer(call, group);
- call->param1 = param1;
+ call->tc_call.param1 = param1;
thread_call_unlock();
splx(s);
*/
boolean_t
thread_call_cancel(
- thread_call_t call)
+ thread_call_t call)
{
- boolean_t result;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
-
+ boolean_t result;
+ thread_call_group_t group;
+ spl_t s;
+
+ group = thread_call_get_group(call);
+
s = splsched();
thread_call_lock_spin();
result = _call_dequeue(call, group);
-
+
thread_call_unlock();
splx(s);
return (result);
}
+/*
+ * Cancel a thread call. If it cannot be cancelled (i.e.
+ * is already in flight), waits for the most recent invocation
+ * to finish. Note that if clients re-submit this thread call,
+ * it may still be pending or in flight when thread_call_cancel_wait
+ * returns, but all requests to execute this work item prior
+ * to the call to thread_call_cancel_wait will have finished.
+ */
+boolean_t
+thread_call_cancel_wait(
+ thread_call_t call)
+{
+ boolean_t result;
+ thread_call_group_t group;
+
+ if ((call->tc_flags & THREAD_CALL_ALLOC) == 0) {
+ panic("%s: Can't wait on thread call whose storage I don't own.", __FUNCTION__);
+ }
+
+ group = thread_call_get_group(call);
+
+ (void) splsched();
+ thread_call_lock_spin();
+
+ result = _call_dequeue(call, group);
+ if (result == FALSE) {
+ thread_call_wait_locked(call);
+ }
+
+ thread_call_unlock();
+ (void) spllo();
+
+ return result;
+}
+
+
#ifndef __LP64__
/*
thread_call_t call,
uint64_t *deadline)
{
- boolean_t result = FALSE;
- thread_call_group_t group = &thread_call_group0;
- spl_t s;
+ boolean_t result = FALSE;
+ thread_call_group_t group;
+ spl_t s;
+
+ group = thread_call_get_group(call);
s = splsched();
thread_call_lock_spin();
- if (call->queue == &group->delayed_queue) {
+ if (call->tc_call.queue == &group->delayed_queue) {
if (deadline != NULL)
- *deadline = call->deadline;
+ *deadline = call->tc_call.deadline;
result = TRUE;
}
* create additional call threads.
*
* Called with thread_call_lock held.
+ *
+ * For high-priority group, only does wakeup/creation if there are no threads
+ * running.
*/
static __inline__ void
thread_call_wake(
thread_call_group_t group)
{
- if (group->idle_count > 0 && wait_queue_wakeup_one(&group->idle_wqueue, NO_EVENT, THREAD_AWAKENED, -1) == KERN_SUCCESS) {
- group->idle_count--; group->active_count++;
- }
- else
- if (!thread_call_daemon_awake) {
- thread_call_daemon_awake = TRUE;
- wait_queue_wakeup_one(&group->daemon_wqueue, NO_EVENT, THREAD_AWAKENED, -1);
+ /*
+ * New behavior: use threads if you've got 'em.
+ * Traditional behavior: wake only if no threads running.
+ */
+ if (group_isparallel(group) || group->active_count == 0) {
+ if (wait_queue_wakeup_one(&group->idle_wqueue, NO_EVENT, THREAD_AWAKENED, -1) == KERN_SUCCESS) {
+ group->idle_count--; group->active_count++;
+
+ if (group->idle_count == 0) {
+ timer_call_cancel(&group->dealloc_timer);
+ group->flags &= TCG_DEALLOC_ACTIVE;
+ }
+ } else {
+ if (!thread_call_daemon_awake && thread_call_group_should_add_thread(group)) {
+ thread_call_daemon_awake = TRUE;
+ wait_queue_wakeup_one(&daemon_wqueue, NO_EVENT, THREAD_AWAKENED, -1);
+ }
+ }
}
}
/*
* sched_call_thread:
*
- * Call out invoked by the scheduler.
+ * Call out invoked by the scheduler. Used only for high-priority
+ * thread call group.
*/
static void
sched_call_thread(
- int type,
-__unused thread_t thread)
+ int type,
+ __unused thread_t thread)
{
- thread_call_group_t group = &thread_call_group0;
+ thread_call_group_t group;
+
+ group = &thread_call_groups[THREAD_CALL_PRIORITY_HIGH]; /* XXX */
thread_call_lock_spin();
switch (type) {
- case SCHED_CALL_BLOCK:
- if (--group->active_count == 0 && group->pending_count > 0)
- thread_call_wake(group);
- break;
+ case SCHED_CALL_BLOCK:
+ --group->active_count;
+ if (group->pending_count > 0)
+ thread_call_wake(group);
+ break;
- case SCHED_CALL_UNBLOCK:
- group->active_count++;
- break;
+ case SCHED_CALL_UNBLOCK:
+ group->active_count++;
+ break;
}
thread_call_unlock();
}
+/*
+ * Interrupts disabled, lock held; returns the same way.
+ * Only called on thread calls whose storage we own. Wakes up
+ * anyone who might be waiting on this work item and frees it
+ * if the client has so requested.
+ */
+static void
+thread_call_finish(thread_call_t call)
+{
+ boolean_t dowake = FALSE;
+
+ call->tc_finish_count++;
+ call->tc_refs--;
+
+ if ((call->tc_flags & THREAD_CALL_WAIT) != 0) {
+ dowake = TRUE;
+ call->tc_flags &= ~THREAD_CALL_WAIT;
+
+ /*
+ * Dropping lock here because the sched call for the
+ * high-pri group can take the big lock from under
+ * a thread lock.
+ */
+ thread_call_unlock();
+ thread_wakeup((event_t)call);
+ thread_call_lock_spin();
+ }
+
+ if (call->tc_refs == 0) {
+ if (dowake) {
+ panic("Someone waiting on a thread call that is scheduled for free: %p\n", call->tc_call.func);
+ }
+
+ enable_ints_and_unlock();
+
+ zfree(thread_call_zone, call);
+
+ (void)disable_ints_and_lock();
+ }
+
+}
+
/*
* thread_call_thread:
*/
static void
thread_call_thread(
- thread_call_group_t group)
+ thread_call_group_t group,
+ wait_result_t wres)
{
- thread_t self = current_thread();
+ thread_t self = current_thread();
+ boolean_t canwait;
- (void) splsched();
- thread_call_lock_spin();
+ /*
+ * A wakeup with THREAD_INTERRUPTED indicates that
+ * we should terminate.
+ */
+ if (wres == THREAD_INTERRUPTED) {
+ thread_terminate(self);
+
+ /* NOTREACHED */
+ panic("thread_terminate() returned?");
+ }
+
+ (void)disable_ints_and_lock();
- thread_sched_call(self, sched_call_thread);
+ thread_sched_call(self, group->sched_call);
- while (group->pending_count > 0) {
+ while (group->pending_count > 0) {
thread_call_t call;
thread_call_func_t func;
thread_call_param_t param0, param1;
call = TC(dequeue_head(&group->pending_queue));
group->pending_count--;
- func = call->func;
- param0 = call->param0;
- param1 = call->param1;
-
- call->queue = NULL;
+ func = call->tc_call.func;
+ param0 = call->tc_call.param0;
+ param1 = call->tc_call.param1;
+
+ call->tc_call.queue = NULL;
_internal_call_release(call);
- thread_call_unlock();
- (void) spllo();
+ /*
+ * Can only do wakeups for thread calls whose storage
+ * we control.
+ */
+ if ((call->tc_flags & THREAD_CALL_ALLOC) != 0) {
+ canwait = TRUE;
+ call->tc_refs++; /* Delay free until we're done */
+ } else
+ canwait = FALSE;
+
+ enable_ints_and_unlock();
KERNEL_DEBUG_CONSTANT(
- MACHDBG_CODE(DBG_MACH_SCHED,MACH_CALLOUT) | DBG_FUNC_NONE,
- func, param0, param1, 0, 0);
+ MACHDBG_CODE(DBG_MACH_SCHED,MACH_CALLOUT) | DBG_FUNC_NONE,
+ VM_KERNEL_UNSLIDE(func), param0, param1, 0, 0);
(*func)(param0, param1);
if (get_preemption_level() != 0) {
int pl = get_preemption_level();
panic("thread_call_thread: preemption_level %d, last callout %p(%p, %p)",
- pl, func, param0, param1);
+ pl, (void *)VM_KERNEL_UNSLIDE(func), param0, param1);
}
-
+
(void)thread_funnel_set(self->funnel_lock, FALSE); /* XXX */
- (void) splsched();
- thread_call_lock_spin();
- }
+ (void) disable_ints_and_lock();
+
+ if (canwait) {
+ /* Frees if so desired */
+ thread_call_finish(call);
+ }
+ }
thread_sched_call(self, NULL);
group->active_count--;
- if (group->idle_count < thread_call_thread_min) {
+ if (group_isparallel(group)) {
+ /*
+ * For new style of thread group, thread always blocks.
+ * If we have more than the target number of threads,
+ * and this is the first to block, and it isn't active
+ * already, set a timer for deallocating a thread if we
+ * continue to have a surplus.
+ */
group->idle_count++;
- wait_queue_assert_wait(&group->idle_wqueue, NO_EVENT, THREAD_UNINT, 0);
-
- thread_call_unlock();
- (void) spllo();
+ if (group->idle_count == 1) {
+ group->idle_timestamp = mach_absolute_time();
+ }
+
+ if (((group->flags & TCG_DEALLOC_ACTIVE) == 0) &&
+ ((group->active_count + group->idle_count) > group->target_thread_count)) {
+ group->flags |= TCG_DEALLOC_ACTIVE;
+ thread_call_start_deallocate_timer(group);
+ }
+
+ /* Wait for more work (or termination) */
+ wres = wait_queue_assert_wait(&group->idle_wqueue, NO_EVENT, THREAD_INTERRUPTIBLE, 0);
+ if (wres != THREAD_WAITING) {
+ panic("kcall worker unable to assert wait?");
+ }
+
+ enable_ints_and_unlock();
thread_block_parameter((thread_continue_t)thread_call_thread, group);
- /* NOTREACHED */
- }
+ } else {
+ if (group->idle_count < group->target_thread_count) {
+ group->idle_count++;
- thread_call_unlock();
- (void) spllo();
-
- thread_terminate(self);
+ wait_queue_assert_wait(&group->idle_wqueue, NO_EVENT, THREAD_UNINT, 0); /* Interrupted means to exit */
+
+ enable_ints_and_unlock();
+
+ thread_block_parameter((thread_continue_t)thread_call_thread, group);
+ /* NOTREACHED */
+ }
+ }
+
+ enable_ints_and_unlock();
+
+ thread_terminate(self);
/* NOTREACHED */
}
/*
- * thread_call_daemon:
+ * thread_call_daemon: walk list of groups, allocating
+ * threads if appropriate (as determined by
+ * thread_call_group_should_add_thread()).
*/
static void
-thread_call_daemon_continue(
- thread_call_group_t group)
+thread_call_daemon_continue(__unused void *arg)
{
- kern_return_t result;
- thread_t thread;
-
- (void) splsched();
- thread_call_lock_spin();
-
- while (group->active_count == 0 && group->pending_count > 0) {
- group->active_count++;
-
- thread_call_unlock();
- (void) spllo();
-
- result = kernel_thread_start_priority((thread_continue_t)thread_call_thread, group, BASEPRI_PREEMPT, &thread);
- if (result != KERN_SUCCESS)
- panic("thread_call_daemon");
+ int i;
+ kern_return_t kr;
+ thread_call_group_t group;
+
+ (void)disable_ints_and_lock();
+
+ /* Starting at zero happens to be high-priority first. */
+ for (i = 0; i < THREAD_CALL_GROUP_COUNT; i++) {
+ group = &thread_call_groups[i];
+ while (thread_call_group_should_add_thread(group)) {
+ group->active_count++;
+
+ enable_ints_and_unlock();
+
+ kr = thread_call_thread_create(group);
+ if (kr != KERN_SUCCESS) {
+ /*
+ * On failure, just pause for a moment and give up.
+ * We can try again later.
+ */
+ delay(10000); /* 10 ms */
+ (void)disable_ints_and_lock();
+ goto out;
+ }
+
+ (void)disable_ints_and_lock();
+ }
+ }
- thread_deallocate(thread);
+out:
+ thread_call_daemon_awake = FALSE;
+ wait_queue_assert_wait(&daemon_wqueue, NO_EVENT, THREAD_UNINT, 0);
- (void) splsched();
- thread_call_lock_spin();
- }
+ enable_ints_and_unlock();
- thread_call_daemon_awake = FALSE;
- wait_queue_assert_wait(&group->daemon_wqueue, NO_EVENT, THREAD_UNINT, 0);
-
- thread_call_unlock();
- (void) spllo();
-
- thread_block_parameter((thread_continue_t)thread_call_daemon_continue, group);
+ thread_block_parameter((thread_continue_t)thread_call_daemon_continue, NULL);
/* NOTREACHED */
}
static void
thread_call_daemon(
- thread_call_group_t group)
+ __unused void *arg)
{
thread_t self = current_thread();
self->options |= TH_OPT_VMPRIV;
vm_page_free_reserve(2); /* XXX */
-
- thread_call_daemon_continue(group);
- /* NOTREACHED */
+
+ thread_call_daemon_continue(NULL);
+ /* NOTREACHED */
+}
+
+/*
+ * Schedule timer to deallocate a worker thread if we have a surplus
+ * of threads (in excess of the group's target) and at least one thread
+ * is idle the whole time.
+ */
+static void
+thread_call_start_deallocate_timer(
+ thread_call_group_t group)
+{
+ uint64_t deadline;
+ boolean_t onqueue;
+
+ assert(group->idle_count > 0);
+
+ group->flags |= TCG_DEALLOC_ACTIVE;
+ deadline = group->idle_timestamp + thread_call_dealloc_interval_abs;
+ onqueue = timer_call_enter(&group->dealloc_timer, deadline, 0);
+
+ if (onqueue) {
+ panic("Deallocate timer already active?");
+ }
}
void
thread_call_delayed_timer(
- timer_call_param_t p0,
- __unused timer_call_param_t p1
+ timer_call_param_t p0,
+ __unused timer_call_param_t p1
)
{
- thread_call_t call;
+ thread_call_t call;
thread_call_group_t group = p0;
- boolean_t new_pending = FALSE;
uint64_t timestamp;
thread_call_lock_spin();
timestamp = mach_absolute_time();
-
- call = TC(queue_first(&group->delayed_queue));
-
- while (!queue_end(&group->delayed_queue, qe(call))) {
- if (call->deadline <= timestamp) {
+
+ call = TC(queue_first(&group->delayed_queue));
+
+ while (!queue_end(&group->delayed_queue, qe(call))) {
+ if (call->tc_call.deadline <= timestamp) {
_pending_call_enqueue(call, group);
- new_pending = TRUE;
}
else
break;
-
+
call = TC(queue_first(&group->delayed_queue));
- }
+ }
if (!queue_end(&group->delayed_queue, qe(call)))
_set_delayed_call_timer(call, group);
- if (new_pending && group->active_count == 0)
- thread_call_wake(group);
+ thread_call_unlock();
+}
+
+/*
+ * Timer callback to tell a thread to terminate if
+ * we have an excess of threads and at least one has been
+ * idle for a long time.
+ */
+static void
+thread_call_dealloc_timer(
+ timer_call_param_t p0,
+ __unused timer_call_param_t p1)
+{
+ thread_call_group_t group = (thread_call_group_t)p0;
+ uint64_t now;
+ kern_return_t res;
+ boolean_t terminated = FALSE;
+
+ thread_call_lock_spin();
+
+ now = mach_absolute_time();
+ if (group->idle_count > 0) {
+ if (now > group->idle_timestamp + thread_call_dealloc_interval_abs) {
+ terminated = TRUE;
+ group->idle_count--;
+ res = wait_queue_wakeup_one(&group->idle_wqueue, NO_EVENT, THREAD_INTERRUPTED, -1);
+ if (res != KERN_SUCCESS) {
+ panic("Unable to wake up idle thread for termination?");
+ }
+ }
+
+ }
+
+ /*
+ * If we still have an excess of threads, schedule another
+ * invocation of this function.
+ */
+ if (group->idle_count > 0 && (group->idle_count + group->active_count > group->target_thread_count)) {
+ /*
+ * If we killed someone just now, push out the
+ * next deadline.
+ */
+ if (terminated) {
+ group->idle_timestamp = now;
+ }
- thread_call_unlock();
+ thread_call_start_deallocate_timer(group);
+ } else {
+ group->flags &= ~TCG_DEALLOC_ACTIVE;
+ }
+
+ thread_call_unlock();
}
+
+/*
+ * Wait for all requested invocations of a thread call prior to now
+ * to finish. Can only be invoked on thread calls whose storage we manage.
+ * Just waits for the finish count to catch up to the submit count we find
+ * at the beginning of our wait.
+ */
+static void
+thread_call_wait_locked(thread_call_t call)
+{
+ uint64_t submit_count;
+ wait_result_t res;
+
+ assert(call->tc_flags & THREAD_CALL_ALLOC);
+
+ submit_count = call->tc_submit_count;
+
+ while (call->tc_finish_count < submit_count) {
+ call->tc_flags |= THREAD_CALL_WAIT;
+
+ res = assert_wait(call, THREAD_UNINT);
+ if (res != THREAD_WAITING) {
+ panic("Unable to assert wait?");
+ }
+
+ thread_call_unlock();
+ (void) spllo();
+
+ res = thread_block(NULL);
+ if (res != THREAD_AWAKENED) {
+ panic("Awoken with %d?", res);
+ }
+
+ (void) splsched();
+ thread_call_lock_spin();
+ }
+}
+
+/*
+ * Determine whether a thread call is either on a queue or
+ * currently being executed.
+ */
+boolean_t
+thread_call_isactive(thread_call_t call)
+{
+ boolean_t active;
+
+ disable_ints_and_lock();
+ active = (call->tc_submit_count > call->tc_finish_count);
+ enable_ints_and_unlock();
+
+ return active;
+}
+
projects / apple / xnu.git / blobdiff