From ec325fee141c1e9757144a0a4094061b56839b78 Mon Sep 17 00:00:00 2001
From: tobi <31960611+tsmethurst@users.noreply.github.com>
Date: Fri, 12 May 2023 14:33:40 +0200
Subject: [chore] Update a bunch of database dependencies (#1772)

* [chore] Update a bunch of database dependencies

* fix lil thing
---
 .../jackc/pgx/v5/internal/nbconn/bufferqueue.go    | 70 ++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 vendor/github.com/jackc/pgx/v5/internal/nbconn/bufferqueue.go

(limited to 'vendor/github.com/jackc/pgx/v5/internal/nbconn/bufferqueue.go')

diff --git a/vendor/github.com/jackc/pgx/v5/internal/nbconn/bufferqueue.go b/vendor/github.com/jackc/pgx/v5/internal/nbconn/bufferqueue.go
new file mode 100644
index 000000000..4bf25481c
--- /dev/null
+++ b/vendor/github.com/jackc/pgx/v5/internal/nbconn/bufferqueue.go
@@ -0,0 +1,70 @@
+package nbconn
+
+import (
+	"sync"
+)
+
+const minBufferQueueLen = 8
+
+type bufferQueue struct {
+	lock  sync.Mutex
+	queue []*[]byte
+	r, w  int
+}
+
+func (bq *bufferQueue) pushBack(buf *[]byte) {
+	bq.lock.Lock()
+	defer bq.lock.Unlock()
+
+	if bq.w >= len(bq.queue) {
+		bq.growQueue()
+	}
+	bq.queue[bq.w] = buf
+	bq.w++
+}
+
+func (bq *bufferQueue) pushFront(buf *[]byte) {
+	bq.lock.Lock()
+	defer bq.lock.Unlock()
+
+	if bq.w >= len(bq.queue) {
+		bq.growQueue()
+	}
+	copy(bq.queue[bq.r+1:bq.w+1], bq.queue[bq.r:bq.w])
+	bq.queue[bq.r] = buf
+	bq.w++
+}
+
+func (bq *bufferQueue) popFront() *[]byte {
+	bq.lock.Lock()
+	defer bq.lock.Unlock()
+
+	if bq.r == bq.w {
+		return nil
+	}
+
+	buf := bq.queue[bq.r]
+	bq.queue[bq.r] = nil // Clear reference so it can be garbage collected.
+	bq.r++
+
+	if bq.r == bq.w {
+		bq.r = 0
+		bq.w = 0
+		if len(bq.queue) > minBufferQueueLen {
+			bq.queue = make([]*[]byte, minBufferQueueLen)
+		}
+	}
+
+	return buf
+}
+
+func (bq *bufferQueue) growQueue() {
+	desiredLen := (len(bq.queue) + 1) * 3 / 2
+	if desiredLen < minBufferQueueLen {
+		desiredLen = minBufferQueueLen
+	}
+
+	newQueue := make([]*[]byte, desiredLen)
+	copy(newQueue, bq.queue)
+	bq.queue = newQueue
+}
-- 
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