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Date: Tue, 1 Jul 2014 23:46:52 +0200
From: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 12/50] mars: add new file include/linux/brick/lib_queue.h
Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
include/linux/brick/lib_queue.h | 146 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 146 insertions(+)
create mode 100644 include/linux/brick/lib_queue.h
diff --git a/include/linux/brick/lib_queue.h b/include/linux/brick/lib_queue.h
new file mode 100644
index 0000000..dcf4e1b
--- /dev/null
+++ b/include/linux/brick/lib_queue.h
@@ -0,0 +1,146 @@
+/* (c) 2011 Thomas Schoebel-Theuer / 1&1 Internet AG */
+
+#ifndef LIB_QUEUE_H
+#define LIB_QUEUE_H
+
+#define QUEUE_ANCHOR(PREFIX, KEYTYPE, HEAPTYPE) \
+ /* parameters */ \
+ /* readonly from outside */ \
+ atomic_t q_queued; \
+ atomic_t q_flying; \
+ atomic_t q_total; \
+ /* tunables */ \
+ int q_batchlen; \
+ int q_io_prio; \
+ bool q_ordering; \
+ /* private */ \
+ wait_queue_head_t *q_event; \
+ spinlock_t q_lock; \
+ 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; \
+ /* this comment is for keeping TRAILING_SEMICOLON happy */
+
+#define QUEUE_FUNCTIONS(PREFIX, ELEM_TYPE, HEAD, KEYFN, KEYCMP, HEAPTYPE)\
+ \
+static inline \
+void q_##PREFIX##_trigger(struct PREFIX##_queue *q) \
+{ \
+ if (q->q_event) { \
+ wake_up_interruptible(q->q_event); \
+ } \
+} \
+ \
+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) \
+{ \
+ spin_lock(&q->q_lock); \
+ \
+ 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; \
+ \
+ spin_unlock(&q->q_lock); \
+ \
+ q_##PREFIX##_trigger(q); \
+} \
+ \
+static inline \
+void q_##PREFIX##_pushback(struct PREFIX##_queue *q, ELEM_TYPE * elem) \
+{ \
+ if (q->q_ordering) { \
+ atomic_dec(&q->q_total); \
+ q_##PREFIX##_insert(q, elem); \
+ return; \
+ } \
+ \
+ spin_lock(&q->q_lock); \
+ \
+ list_add(&elem->HEAD, &q->q_anchor); \
+ atomic_inc(&q->q_queued); \
+ \
+ spin_unlock(&q->q_lock); \
+} \
+ \
+static inline \
+ELEM_TYPE *q_##PREFIX##_fetch(struct PREFIX##_queue *q) \
+{ \
+ ELEM_TYPE *elem = NULL; \
+ \
+ spin_lock(&q->q_lock); \
+ \
+ 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)) {\
+ XIO_ERR("backskip pos %lld -> %lld\n", \
+ (long long)q->last_pos, (long long)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); \
+ } \
+ \
+ spin_unlock(&q->q_lock); \
+ \
+ q_##PREFIX##_trigger(q); \
+ \
+ return elem; \
+} \
+ \
+static inline \
+void q_##PREFIX##_inc_flying(struct PREFIX##_queue *q) \
+{ \
+ atomic_inc(&q->q_flying); \
+ q_##PREFIX##_trigger(q); \
+} \
+ \
+static inline \
+void q_##PREFIX##_dec_flying(struct PREFIX##_queue *q) \
+{ \
+ atomic_dec(&q->q_flying); \
+ q_##PREFIX##_trigger(q); \
+} \
+ \
+
+#endif
--
2.0.0
--
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