ceph/src/arrow/go/arrow/cdata/exports.go

   1 // Licensed to the Apache Software Foundation (ASF) under one
   2 // or more contributor license agreements.  See the NOTICE file
   3 // distributed with this work for additional information
   4 // regarding copyright ownership.  The ASF licenses this file
   5 // to you under the Apache License, Version 2.0 (the
   6 // "License"); you may not use this file except in compliance
   7 // with the License.  You may obtain a copy of the License at
   8 //
   9 // http://www.apache.org/licenses/LICENSE-2.0
  10 //
  11 // Unless required by applicable law or agreed to in writing, software
  12 // distributed under the License is distributed on an "AS IS" BASIS,
  13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 // See the License for the specific language governing permissions and
  15 // limitations under the License.
  16
  17 package cdata
  18
  19 import (
  20         "reflect"
  21         "sync"
  22         "sync/atomic"
  23         "unsafe"
  24
  25         "github.com/apache/arrow/go/v6/arrow/array"
  26 )
  27
  28 // #include <stdlib.h>
  29 // #include "arrow/c/helpers.h"
  30 import "C"
  31
  32 var (
  33         handles   = sync.Map{}
  34         handleIdx uintptr
  35 )
  36
  37 type dataHandle uintptr
  38
  39 func storeData(d *array.Data) dataHandle {
  40         h := atomic.AddUintptr(&handleIdx, 1)
  41         if h == 0 {
  42                 panic("cgo: ran out of space")
  43         }
  44         d.Retain()
  45         handles.Store(h, d)
  46         return dataHandle(h)
  47 }
  48
  49 func (d dataHandle) releaseData() {
  50         arrd, ok := handles.LoadAndDelete(uintptr(d))
  51         if !ok {
  52                 panic("cgo: invalid datahandle")
  53         }
  54         arrd.(*array.Data).Release()
  55 }
  56
  57 //export releaseExportedSchema
  58 func releaseExportedSchema(schema *CArrowSchema) {
  59         if C.ArrowSchemaIsReleased(schema) == 1 {
  60                 return
  61         }
  62         defer C.ArrowSchemaMarkReleased(schema)
  63
  64         C.free(unsafe.Pointer(schema.name))
  65         C.free(unsafe.Pointer(schema.format))
  66         C.free(unsafe.Pointer(schema.metadata))
  67
  68         if schema.n_children == 0 {
  69                 return
  70         }
  71
  72         var children []*CArrowSchema
  73         s := (*reflect.SliceHeader)(unsafe.Pointer(&children))
  74         s.Data = uintptr(unsafe.Pointer(schema.children))
  75         s.Len = int(schema.n_children)
  76         s.Cap = int(schema.n_children)
  77
  78         for _, c := range children {
  79                 C.ArrowSchemaRelease(c)
  80         }
  81
  82         C.free(unsafe.Pointer(children[0]))
  83         C.free(unsafe.Pointer(schema.children))
  84 }
  85
  86 //export releaseExportedArray
  87 func releaseExportedArray(arr *CArrowArray) {
  88         if C.ArrowArrayIsReleased(arr) == 1 {
  89                 return
  90         }
  91         defer C.ArrowArrayMarkReleased(arr)
  92
  93         if arr.n_buffers > 0 {
  94                 C.free(unsafe.Pointer(arr.buffers))
  95         }
  96
  97         if arr.n_children > 0 {
  98                 var children []*CArrowArray
  99                 s := (*reflect.SliceHeader)(unsafe.Pointer(&children))
 100                 s.Data = uintptr(unsafe.Pointer(arr.children))
 101                 s.Len = int(arr.n_children)
 102                 s.Cap = int(arr.n_children)
 103
 104                 for _, c := range children {
 105                         C.ArrowArrayRelease(c)
 106                 }
 107                 C.free(unsafe.Pointer(children[0]))
 108                 C.free(unsafe.Pointer(arr.children))
 109         }
 110
 111         h := dataHandle(arr.private_data)
 112         h.releaseData()
 113 }