mirror of https://github.com/schoebel/mars
128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
|
// (c) 2011 Thomas Schoebel-Theuer / 1&1 Internet AG
|
||
|
|
||
|
#ifndef LIB_QUEUE_H
|
||
|
#define LIB_QUEUE_H
|
||
|
|
||
|
#define QUEUE_ANCHOR(PREFIX,KEYTYPE,HEAPTYPE) \
|
||
|
struct PREFIX##_queue *q_dep; \
|
||
|
atomic_t *q_dep_plus; \
|
||
|
struct list_head q_anchor; \
|
||
|
struct pairing_heap_##HEAPTYPE *heap_high; \
|
||
|
struct pairing_heap_##HEAPTYPE *heap_low; \
|
||
|
long long q_last_insert; /* jiffies */ \
|
||
|
KEYTYPE heap_margin; \
|
||
|
KEYTYPE last_pos; \
|
||
|
spinlock_t q_lock; \
|
||
|
/* readonly from outside */ \
|
||
|
atomic_t q_queued; \
|
||
|
atomic_t q_flying; \
|
||
|
atomic_t q_total; \
|
||
|
/* tunables */ \
|
||
|
int q_batchlen; \
|
||
|
int q_max_queued; \
|
||
|
int q_max_flying; \
|
||
|
int q_max_jiffies; \
|
||
|
int q_max_contention; \
|
||
|
int q_over_pressure; \
|
||
|
int q_io_prio; \
|
||
|
bool q_ordering; \
|
||
|
|
||
|
|
||
|
#define QUEUE_FUNCTIONS(PREFIX,ELEM_TYPE,HEAD,KEYFN,KEYCMP,HEAPTYPE) \
|
||
|
\
|
||
|
static inline \
|
||
|
void q_##PREFIX##_init(struct PREFIX##_queue *q) \
|
||
|
{ \
|
||
|
INIT_LIST_HEAD(&q->q_anchor); \
|
||
|
q->heap_low = NULL; \
|
||
|
q->heap_high = NULL; \
|
||
|
spin_lock_init(&q->q_lock); \
|
||
|
atomic_set(&q->q_queued, 0); \
|
||
|
atomic_set(&q->q_flying, 0); \
|
||
|
} \
|
||
|
\
|
||
|
static inline \
|
||
|
void q_##PREFIX##_insert(struct PREFIX##_queue *q, ELEM_TYPE *elem) \
|
||
|
{ \
|
||
|
unsigned long flags; \
|
||
|
\
|
||
|
traced_lock(&q->q_lock, flags); \
|
||
|
\
|
||
|
if (q->q_ordering) { \
|
||
|
struct pairing_heap_##HEAPTYPE **use = &q->heap_high; \
|
||
|
if (KEYCMP(KEYFN(elem), &q->heap_margin) <= 0) { \
|
||
|
use = &q->heap_low; \
|
||
|
} \
|
||
|
ph_insert_##HEAPTYPE(use, &elem->ph); \
|
||
|
} else { \
|
||
|
list_add_tail(&elem->HEAD, &q->q_anchor); \
|
||
|
} \
|
||
|
atomic_inc(&q->q_queued); \
|
||
|
atomic_inc(&q->q_total); \
|
||
|
q->q_last_insert = jiffies; \
|
||
|
\
|
||
|
traced_unlock(&q->q_lock, flags); \
|
||
|
} \
|
||
|
\
|
||
|
static inline \
|
||
|
void q_##PREFIX##_pushback(struct PREFIX##_queue *q, ELEM_TYPE *elem) \
|
||
|
{ \
|
||
|
unsigned long flags; \
|
||
|
\
|
||
|
if (q->q_ordering) { \
|
||
|
atomic_dec(&q->q_total); \
|
||
|
q_##PREFIX##_insert(q, elem); \
|
||
|
return; \
|
||
|
} \
|
||
|
\
|
||
|
traced_lock(&q->q_lock, flags); \
|
||
|
\
|
||
|
list_add(&elem->HEAD, &q->q_anchor); \
|
||
|
atomic_inc(&q->q_queued); \
|
||
|
\
|
||
|
traced_unlock(&q->q_lock, flags); \
|
||
|
} \
|
||
|
\
|
||
|
static inline \
|
||
|
ELEM_TYPE *q_##PREFIX##_fetch(struct PREFIX##_queue *q) \
|
||
|
{ \
|
||
|
ELEM_TYPE *elem = NULL; \
|
||
|
unsigned long flags; \
|
||
|
\
|
||
|
traced_lock(&q->q_lock, flags); \
|
||
|
\
|
||
|
if (q->q_ordering) { \
|
||
|
if (!q->heap_high) { \
|
||
|
q->heap_high = q->heap_low; \
|
||
|
q->heap_low = NULL; \
|
||
|
q->heap_margin = 0; \
|
||
|
q->last_pos = 0; \
|
||
|
} \
|
||
|
if (q->heap_high) { \
|
||
|
elem = container_of(q->heap_high, ELEM_TYPE, ph); \
|
||
|
\
|
||
|
if (unlikely(KEYCMP(KEYFN(elem), &q->last_pos) < 0)) { \
|
||
|
MARS_ERR("backskip pos %lld -> %lld\n", q->last_pos, KEYFN(elem)); \
|
||
|
} \
|
||
|
memcpy(&q->last_pos, KEYFN(elem), sizeof(q->last_pos)); \
|
||
|
\
|
||
|
if (KEYCMP(KEYFN(elem), &q->heap_margin) > 0) { \
|
||
|
memcpy(&q->heap_margin, KEYFN(elem), sizeof(q->heap_margin)); \
|
||
|
} \
|
||
|
ph_delete_min_##HEAPTYPE(&q->heap_high); \
|
||
|
atomic_dec(&q->q_queued); \
|
||
|
} \
|
||
|
} else if (!list_empty(&q->q_anchor)) { \
|
||
|
struct list_head *next = q->q_anchor.next; \
|
||
|
list_del_init(next); \
|
||
|
atomic_dec(&q->q_queued); \
|
||
|
elem = container_of(next, ELEM_TYPE, HEAD); \
|
||
|
} \
|
||
|
\
|
||
|
traced_unlock(&q->q_lock, flags); \
|
||
|
\
|
||
|
return elem; \
|
||
|
}
|
||
|
|
||
|
#endif
|