82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Manuel Serrano and Xavier Leroy, INRIA Rocquencourt */
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/* */
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/* Copyright 2000 Institut National de Recherche en Informatique et */
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/* en Automatique. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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#define CAML_INTERNALS
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#include "caml/alloc.h"
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#include "caml/bigarray.h"
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#include "caml/custom.h"
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#include "caml/memory.h"
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#include "caml/misc.h"
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/* Allocation of bigarrays for memory-mapped files.
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This is the OS-independent part of [mmap.c]. */
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extern void caml_ba_unmap_file(void *, uintnat);
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static void caml_ba_mapped_finalize(value v)
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{
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struct caml_ba_array * b = Caml_ba_array_val(v);
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CAMLassert((b->flags & CAML_BA_MANAGED_MASK) == CAML_BA_MAPPED_FILE);
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if (b->proxy == NULL) {
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caml_ba_unmap_file(b->data, caml_ba_byte_size(b));
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} else {
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if (-- b->proxy->refcount == 0) {
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caml_ba_unmap_file(b->proxy->data, b->proxy->size);
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free(b->proxy);
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}
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}
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}
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/* Operation table for bigarrays representing memory-mapped files.
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Only the finalization method differs from regular bigarrays. */
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static struct custom_operations caml_ba_mapped_ops = {
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"_bigarray",
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caml_ba_mapped_finalize,
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caml_ba_compare,
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caml_ba_hash,
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caml_ba_serialize,
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caml_ba_deserialize,
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custom_compare_ext_default,
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custom_fixed_length_default
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};
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/* [caml_unix_mapped_alloc] allocates a new bigarray object in the heap
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corresponding to a memory-mapped file. */
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CAMLexport value
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caml_unix_mapped_alloc(int flags, int num_dims, void * data, intnat * dim)
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{
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uintnat asize;
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int i;
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value res;
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struct caml_ba_array * b;
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intnat dimcopy[CAML_BA_MAX_NUM_DIMS];
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CAMLassert(num_dims >= 0 && num_dims <= CAML_BA_MAX_NUM_DIMS);
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CAMLassert((flags & CAML_BA_KIND_MASK) <= CAML_BA_CHAR);
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for (i = 0; i < num_dims; i++) dimcopy[i] = dim[i];
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asize = SIZEOF_BA_ARRAY + num_dims * sizeof(intnat);
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res = caml_alloc_custom(&caml_ba_mapped_ops, asize, 0, 1);
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b = Caml_ba_array_val(res);
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b->data = data;
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b->num_dims = num_dims;
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b->flags = flags | CAML_BA_MAPPED_FILE;
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b->proxy = NULL;
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for (i = 0; i < num_dims; i++) b->dim[i] = dimcopy[i];
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return res;
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}
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