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exports.go
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exports.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cdata
import (
"reflect"
"sync"
"sync/atomic"
"unsafe"
"github.com/jiuzhiqian/aliyun-odps-go-sdk/arrow/array"
)
// #include <stdlib.h>
// #include "arrow/c/helpers.h"
import "C"
var (
handles = sync.Map{}
handleIdx uintptr
)
type dataHandle uintptr
func storeData(d *array.Data) dataHandle {
h := atomic.AddUintptr(&handleIdx, 1)
if h == 0 {
panic("cgo: ran out of space")
}
d.Retain()
handles.Store(h, d)
return dataHandle(h)
}
func (d dataHandle) releaseData() {
arrd, ok := handles.LoadAndDelete(uintptr(d))
if !ok {
panic("cgo: invalid datahandle")
}
arrd.(*array.Data).Release()
}
//export releaseExportedSchema
func releaseExportedSchema(schema *CArrowSchema) {
if C.ArrowSchemaIsReleased(schema) == 1 {
return
}
defer C.ArrowSchemaMarkReleased(schema)
C.free(unsafe.Pointer(schema.name))
C.free(unsafe.Pointer(schema.format))
C.free(unsafe.Pointer(schema.metadata))
if schema.n_children == 0 {
return
}
var children []*CArrowSchema
s := (*reflect.SliceHeader)(unsafe.Pointer(&children))
s.Data = uintptr(unsafe.Pointer(schema.children))
s.Len = int(schema.n_children)
s.Cap = int(schema.n_children)
for _, c := range children {
C.ArrowSchemaRelease(c)
}
C.free(unsafe.Pointer(children[0]))
C.free(unsafe.Pointer(schema.children))
}
//export releaseExportedArray
func releaseExportedArray(arr *CArrowArray) {
if C.ArrowArrayIsReleased(arr) == 1 {
return
}
defer C.ArrowArrayMarkReleased(arr)
if arr.n_buffers > 0 {
C.free(unsafe.Pointer(arr.buffers))
}
if arr.n_children > 0 {
var children []*CArrowArray
s := (*reflect.SliceHeader)(unsafe.Pointer(&children))
s.Data = uintptr(unsafe.Pointer(arr.children))
s.Len = int(arr.n_children)
s.Cap = int(arr.n_children)
for _, c := range children {
C.ArrowArrayRelease(c)
}
C.free(unsafe.Pointer(children[0]))
C.free(unsafe.Pointer(arr.children))
}
h := dataHandle(arr.private_data)
h.releaseData()
}