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lib: use heap to manage timers

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Signed-off-by: Christian Franke <chris@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
Christian Franke 2013-11-19 14:11:42 +00:00 committed by David Lamparter
parent 514991c763
commit 4becea724c
4 changed files with 110 additions and 53 deletions
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17
lib/pqueue.c
View File

@ -168,3 +168,20 @@ pqueue_dequeue (struct pqueue *queue)
trickle_down (0, queue);
return data;
}
void
pqueue_remove_at (int index, struct pqueue *queue)
{
queue->array[index] = queue->array[--queue->size];
if (index > 0
&& (*queue->cmp) (queue->array[index],
queue->array[PARENT_OF(index)]) < 0)
{
trickle_up (index, queue);
}
else
{
trickle_down (index, queue);
}
}

1
lib/pqueue.h
View File

@ -38,6 +38,7 @@ extern void pqueue_delete (struct pqueue *queue);
extern void pqueue_enqueue (void *data, struct pqueue *queue);
extern void *pqueue_dequeue (struct pqueue *queue);
extern void pqueue_remove_at (int index, struct pqueue *queue);
extern void trickle_down (int index, struct pqueue *queue);
extern void trickle_up (int index, struct pqueue *queue);

138
lib/thread.c
View File

@ -27,6 +27,7 @@
#include "memory.h"
#include "log.h"
#include "hash.h"
#include "pqueue.h"
#include "command.h"
#include "sigevent.h"
@ -496,17 +497,49 @@ DEFUN(clear_thread_cpu,
return CMD_SUCCESS;
}
static int
thread_timer_cmp(void *a, void *b)
{
struct thread *thread_a = a;
struct thread *thread_b = b;
long cmp = timeval_cmp(thread_a->u.sands, thread_b->u.sands);
if (cmp < 0)
return -1;
if (cmp > 0)
return 1;
return 0;
}
static void
thread_timer_update(void *node, int actual_position)
{
struct thread *thread = node;
thread->index = actual_position;
}
/* Allocate new thread master. */
struct thread_master *
thread_master_create ()
{
struct thread_master *rv;
if (cpu_record == NULL)
cpu_record
= hash_create ((unsigned int (*) (void *))cpu_record_hash_key,
(int (*) (const void *, const void *))cpu_record_hash_cmp);
return (struct thread_master *) XCALLOC (MTYPE_THREAD_MASTER,
sizeof (struct thread_master));
rv = XCALLOC (MTYPE_THREAD_MASTER, sizeof (struct thread_master));
/* Initialize the timer queues */
rv->timer = pqueue_create();
rv->background = pqueue_create();
rv->timer->cmp = rv->background->cmp = thread_timer_cmp;
rv->timer->update = rv->background->update = thread_timer_update;
return rv;
}
/* Add a new thread to the list. */
@ -523,22 +556,6 @@ thread_list_add (struct thread_list *list, struct thread *thread)
list->count++;
}
/* Add a new thread just before the point. */
static void
thread_list_add_before (struct thread_list *list,
struct thread *point,
struct thread *thread)
{
thread->next = point;
thread->prev = point->prev;
if (point->prev)
point->prev->next = thread;
else
list->head = thread;
point->prev = thread;
list->count++;
}
/* Delete a thread from the list. */
static struct thread *
thread_list_delete (struct thread_list *list, struct thread *thread)
@ -584,17 +601,29 @@ thread_list_free (struct thread_master *m, struct thread_list *list)
}
}
static void
thread_queue_free (struct thread_master *m, struct pqueue *queue)
{
int i;
for (i = 0; i < queue->size; i++)
XFREE(MTYPE_THREAD, queue->array[i]);
m->alloc -= queue->size;
pqueue_delete(queue);
}
/* Stop thread scheduler. */
void
thread_master_free (struct thread_master *m)
{
thread_list_free (m, &m->read);
thread_list_free (m, &m->write);
thread_list_free (m, &m->timer);
thread_queue_free (m, m->timer);
thread_list_free (m, &m->event);
thread_list_free (m, &m->ready);
thread_list_free (m, &m->unuse);
thread_list_free (m, &m->background);
thread_queue_free (m, m->background);
XFREE (MTYPE_THREAD_MASTER, m);
@ -676,7 +705,8 @@ thread_get (struct thread_master *m, u_char type,
thread->master = m;
thread->func = func;
thread->arg = arg;
thread->index = -1;
strip_funcname (thread->funcname, funcname);
return thread;
@ -737,16 +767,15 @@ funcname_thread_add_timer_timeval (struct thread_master *m,
const char* funcname)
{
struct thread *thread;
struct thread_list *list;
struct pqueue *queue;
struct timeval alarm_time;
struct thread *tt;
assert (m != NULL);
assert (type == THREAD_TIMER || type == THREAD_BACKGROUND);
assert (time_relative);
list = ((type == THREAD_TIMER) ? &m->timer : &m->background);
queue = ((type == THREAD_TIMER) ? m->timer : m->background);
thread = thread_get (m, type, func, arg, funcname);
/* Do we need jitter here? */
@ -755,16 +784,7 @@ funcname_thread_add_timer_timeval (struct thread_master *m,
alarm_time.tv_usec = relative_time.tv_usec + time_relative->tv_usec;
thread->u.sands = timeval_adjust(alarm_time);
/* Sort by timeval. */
for (tt = list->head; tt; tt = tt->next)
if (timeval_cmp (thread->u.sands, tt->u.sands) <= 0)
break;
if (tt)
thread_list_add_before (list, tt, thread);
else
thread_list_add (list, thread);
pqueue_enqueue(thread, queue);
return thread;
}
@ -849,7 +869,8 @@ funcname_thread_add_event (struct thread_master *m,
void
thread_cancel (struct thread *thread)
{
struct thread_list *list;
struct thread_list *list = NULL;
struct pqueue *queue = NULL;
switch (thread->type)
{
@ -864,7 +885,7 @@ thread_cancel (struct thread *thread)
list = &thread->master->write;
break;
case THREAD_TIMER:
list = &thread->master->timer;
queue = thread->master->timer;
break;
case THREAD_EVENT:
list = &thread->master->event;
@ -873,13 +894,28 @@ thread_cancel (struct thread *thread)
list = &thread->master->ready;
break;
case THREAD_BACKGROUND:
list = &thread->master->background;
queue = thread->master->background;
break;
default:
return;
break;
}
thread_list_delete (list, thread);
if (queue)
{
assert(thread->index >= 0);
assert(thread == queue->array[thread->index]);
pqueue_remove_at(thread->index, queue);
}
else if (list)
{
thread_list_delete (list, thread);
}
else
{
assert(!"Thread should be either in queue or list!");
}
thread->type = THREAD_UNUSED;
thread_add_unuse (thread->master, thread);
}
@ -929,11 +965,12 @@ thread_cancel_event (struct thread_master *m, void *arg)
}
static struct timeval *
thread_timer_wait (struct thread_list *tlist, struct timeval *timer_val)
thread_timer_wait (struct pqueue *queue, struct timeval *timer_val)
{
if (!thread_empty (tlist))
if (queue->size)
{
*timer_val = timeval_subtract (tlist->head->u.sands, relative_time);
struct thread *next_timer = queue->array[0];
*timer_val = timeval_subtract (next_timer->u.sands, relative_time);
return timer_val;
}
return NULL;
@ -977,18 +1014,17 @@ thread_process_fd (struct thread_list *list, fd_set *fdset, fd_set *mfdset)
/* Add all timers that have popped to the ready list. */
static unsigned int
thread_timer_process (struct thread_list *list, struct timeval *timenow)
thread_timer_process (struct pqueue *queue, struct timeval *timenow)
{
struct thread *thread;
struct thread *next;
unsigned int ready = 0;
for (thread = list->head; thread; thread = next)
while (queue->size)
{
next = thread->next;
thread = queue->array[0];
if (timeval_cmp (*timenow, thread->u.sands) < 0)
return ready;
thread_list_delete (list, thread);
pqueue_dequeue(queue);
thread->type = THREAD_READY;
thread_list_add (&thread->master->ready, thread);
ready++;
@ -1064,8 +1100,8 @@ thread_fetch (struct thread_master *m, struct thread *fetch)
if (m->ready.count == 0)
{
quagga_get_relative (NULL);
timer_wait = thread_timer_wait (&m->timer, &timer_val);
timer_wait_bg = thread_timer_wait (&m->background, &timer_val_bg);
timer_wait = thread_timer_wait (m->timer, &timer_val);
timer_wait_bg = thread_timer_wait (m->background, &timer_val_bg);
if (timer_wait_bg &&
(!timer_wait || (timeval_cmp (*timer_wait, *timer_wait_bg) > 0)))
@ -1121,7 +1157,7 @@ thread_fetch (struct thread_master *m, struct thread *fetch)
priority than I/O threads, so let's push them onto the ready
list in front of the I/O threads. */
quagga_get_relative (NULL);
thread_timer_process (&m->timer, &relative_time);
thread_timer_process (m->timer, &relative_time);
/* Got IO, process it */
if (num > 0)
@ -1142,7 +1178,7 @@ thread_fetch (struct thread_master *m, struct thread *fetch)
#endif
/* Background timer/events, lowest priority */
thread_timer_process (&m->background, &relative_time);
thread_timer_process (m->background, &relative_time);
if ((thread = thread_trim_head (&m->ready)) != NULL)
return thread_run (m, thread, fetch);

7
lib/thread.h
View File

@ -44,16 +44,18 @@ struct thread_list
int count;
};
struct pqueue;
/* Master of the theads. */
struct thread_master
{
struct thread_list read;
struct thread_list write;
struct thread_list timer;
struct pqueue *timer;
struct thread_list event;
struct thread_list ready;
struct thread_list unuse;
struct thread_list background;
struct pqueue *background;
fd_set readfd;
fd_set writefd;
fd_set exceptfd;
@ -80,6 +82,7 @@ struct thread
int fd; /* file descriptor in case of read/write. */
struct timeval sands; /* rest of time sands value. */
} u;
int index; /* used for timers to store position in queue */
struct timeval real;
struct cpu_thread_history *hist; /* cache pointer to cpu_history */
char funcname[FUNCNAME_LEN];