mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-10-23 13:32:17 +00:00
c06e6fb656
* update go-structr and go-mutexes with memory usage improvements * bump to go-structr v0.8.4
100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
package mempool
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
const DefaultDirtyFactor = 128
|
|
|
|
// Pool provides a type-safe form
|
|
// of UnsafePool using generics.
|
|
//
|
|
// Note it is NOT safe for concurrent
|
|
// use, you must protect it yourself!
|
|
type Pool[T any] struct {
|
|
|
|
// New is an optionally provided
|
|
// allocator used when no value
|
|
// is available for use in pool.
|
|
New func() T
|
|
|
|
// Reset is an optionally provided
|
|
// value resetting function called
|
|
// on passed value to Put().
|
|
Reset func(T)
|
|
|
|
UnsafePool
|
|
}
|
|
|
|
func (p *Pool[T]) Get() T {
|
|
if ptr := p.UnsafePool.Get(); ptr != nil {
|
|
return *(*T)(ptr)
|
|
} else if p.New != nil {
|
|
return p.New()
|
|
}
|
|
var z T
|
|
return z
|
|
}
|
|
|
|
func (p *Pool[T]) Put(t T) {
|
|
if p.Reset != nil {
|
|
p.Reset(t)
|
|
}
|
|
ptr := unsafe.Pointer(&t)
|
|
p.UnsafePool.Put(ptr)
|
|
}
|
|
|
|
// UnsafePool provides an incredibly
|
|
// simple memory pool implementation
|
|
// that stores ptrs to memory values,
|
|
// and regularly flushes internal pool
|
|
// structures according to DirtyFactor.
|
|
//
|
|
// Note it is NOT safe for concurrent
|
|
// use, you must protect it yourself!
|
|
type UnsafePool struct {
|
|
|
|
// DirtyFactor determines the max
|
|
// number of $dirty count before
|
|
// pool is garbage collected. Where:
|
|
// $dirty = len(current) - len(victim)
|
|
DirtyFactor int
|
|
|
|
current []unsafe.Pointer
|
|
victim []unsafe.Pointer
|
|
}
|
|
|
|
func (p *UnsafePool) Get() unsafe.Pointer {
|
|
// First try current list.
|
|
if len(p.current) > 0 {
|
|
ptr := p.current[len(p.current)-1]
|
|
p.current = p.current[:len(p.current)-1]
|
|
return ptr
|
|
}
|
|
|
|
// Fallback to victim.
|
|
if len(p.victim) > 0 {
|
|
ptr := p.victim[len(p.victim)-1]
|
|
p.victim = p.victim[:len(p.victim)-1]
|
|
return ptr
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (p *UnsafePool) Put(ptr unsafe.Pointer) {
|
|
p.current = append(p.current, ptr)
|
|
|
|
// Get dirty factor.
|
|
df := p.DirtyFactor
|
|
if df == 0 {
|
|
df = DefaultDirtyFactor
|
|
}
|
|
|
|
if len(p.current)-len(p.victim) > df {
|
|
// Garbage collection!
|
|
p.victim = p.current
|
|
p.current = nil
|
|
}
|
|
}
|