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99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package cgoconverter
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/*
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#include <stdlib.h>
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*/
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import "C"
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import (
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"math"
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"sync/atomic"
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"unsafe"
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"github.com/milvus-io/milvus/pkg/util/typeutil"
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)
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const maxByteArrayLen = math.MaxInt32
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var globalConverter = NewBytesConverter()
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type BytesConverter struct {
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pointers *typeutil.ConcurrentMap[int32, unsafe.Pointer] // leaseId -> unsafe.Pointer
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nextLease int32
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}
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func NewBytesConverter() *BytesConverter {
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return &BytesConverter{
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pointers: typeutil.NewConcurrentMap[int32, unsafe.Pointer](),
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nextLease: 0,
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}
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}
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func (converter *BytesConverter) add(p unsafe.Pointer) int32 {
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lease := atomic.AddInt32(&converter.nextLease, 1)
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converter.pointers.Insert(lease, p)
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return lease
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}
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// Return a lease and []byte from C bytes (typically char*)
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// which references the same memory of C bytes
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// Call Release(lease) after you don't need the returned []byte
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func (converter *BytesConverter) UnsafeGoBytes(cbytes *unsafe.Pointer, len int) (int32, []byte) {
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var (
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goBytes []byte
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lease int32
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)
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if len > maxByteArrayLen {
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// C.GoBytes takes the length as C.int,
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// which is always 32-bit (not depends on platform)
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panic("UnsafeGoBytes: out of length")
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}
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goBytes = (*[maxByteArrayLen]byte)(*cbytes)[:len:len]
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lease = converter.add(*cbytes)
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*cbytes = nil
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return lease, goBytes
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}
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func (converter *BytesConverter) Release(lease int32) {
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p := converter.Extract(lease)
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C.free(p)
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}
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func (converter *BytesConverter) Extract(lease int32) unsafe.Pointer {
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p, ok := converter.pointers.GetAndRemove(lease)
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if !ok {
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panic("try to release the resource that doesn't exist")
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}
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return p
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}
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// Make sure only the caller own the converter
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// or this would release someone's memory
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func (converter *BytesConverter) ReleaseAll() {
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converter.pointers.Range(func(lease int32, pointer unsafe.Pointer) bool {
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converter.pointers.GetAndRemove(lease)
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C.free(pointer)
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return true
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})
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}
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func UnsafeGoBytes(cbytes *unsafe.Pointer, len int) (int32, []byte) {
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return globalConverter.UnsafeGoBytes(cbytes, len)
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}
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func Release(lease int32) {
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globalConverter.Release(lease)
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}
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func Extract(lease int32) unsafe.Pointer {
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return globalConverter.Extract(lease)
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}
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// DO NOT provide ReleaseAll() method for global converter
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