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push is now threadsafe #3

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push is now threadsafe #3

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17 changes: 9 additions & 8 deletions collections/ringbuffer/ringbuffer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,16 +2,17 @@ package ringbuffer

import (
"fmt"
"sync/atomic"

armath "github.com/asymmetric-research/go-commons/math"
)

type T[C any] struct {
buflen uint
buflen uint64
buf []C

// head points to the next free slot
head uint
head uint64
}

func New[C any](size int) (*T[C], error) {
Expand All @@ -26,16 +27,16 @@ func NewInto[C any](dst *T[C], buf []C) error {
return fmt.Errorf("backing buffer must have a greater than zero")
}
*dst = T[C]{
buflen: uint(len(buf)),
buflen: uint64(len(buf)),
buf: buf,
head: 0,
}
return nil
}

func (r *T[C]) Push(item C) {
r.buf[r.head%r.buflen] = item
r.head += 1
off := atomic.AddUint64(&r.head, 1)
r.buf[(off-1)%r.buflen] = item
}

func (r *T[C]) Last(dst []C) int {
Expand Down Expand Up @@ -80,7 +81,7 @@ func (r *T[C]) Last(dst []C) int {
return n
}

func (r *T[C]) Len() uint {
func (r *T[C]) Len() uint64 {
used := armath.Min(r.buflen, r.head)
return used
}
Expand All @@ -92,8 +93,8 @@ const (
SEQ_MODE_FILO
)

func (r *T[C]) Seq(seqMode SeqMode) func(yield func(uint, C) bool) {
return func(yield func(uint, C) bool) {
func (r *T[C]) Seq(seqMode SeqMode) func(yield func(uint64, C) bool) {
return func(yield func(uint64, C) bool) {
if r.buflen == 0 {
return
}
Expand Down
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