lib/babeltrace/iterator-internal.h

   1 #ifndef _BABELTRACE_ITERATOR_INTERNAL_H
   2 #define _BABELTRACE_ITERATOR_INTERNAL_H
   3
   4 /*
   5  * BabelTrace
   6  *
   7  * Internal iterator header
   8  *
   9  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
  10  *
  11  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a copy
  14  * of this software and associated documentation files (the "Software"), to deal
  15  * in the Software without restriction, including without limitation the rights
  16  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  17  * copies of the Software, and to permit persons to whom the Software is
  18  * furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice shall be included in
  21  * all copies or substantial portions of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  26  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  27  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  28  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  29  * SOFTWARE.
  30  */
  31
  32 #include <babeltrace/ctf/events.h>
  33
  34 /*
  35  * struct bt_iter: data structure representing an iterator on a trace
  36  * collection.
  37  */
  38 struct bt_iter {
  39         struct ptr_heap *stream_heap;
  40         struct bt_context *ctx;
  41         const struct bt_iter_pos *end_pos;
  42 };
  43
  44 /*
  45  * bt_iter_create - Allocate a trace collection iterator.
  46  *
  47  * begin_pos and end_pos are optional parameters to specify the position
  48  * at which the trace collection should be seeked upon iterator
  49  * creation, and the position at which iteration will start returning
  50  * "EOF".
  51  *
  52  * By default, if begin_pos is NULL, a BT_SEEK_CUR is performed at
  53  * creation. By default, if end_pos is NULL, a BT_SEEK_END (end of
  54  * trace) is the EOF criterion.
  55  */
  56 struct bt_iter *bt_iter_create(struct bt_context *ctx,
  57                 const struct bt_iter_pos *begin_pos,
  58                 const struct bt_iter_pos *end_pos);
  59
  60 /*
  61  * bt_iter_destroy - Free a trace collection iterator.
  62  */
  63 void bt_iter_destroy(struct bt_iter *iter);
  64
  65 int bt_iter_init(struct bt_iter *iter,
  66                 struct bt_context *ctx,
  67                 const struct bt_iter_pos *begin_pos,
  68                 const struct bt_iter_pos *end_pos);
  69 void bt_iter_fini(struct bt_iter *iter);
  70
  71 #endif /* _BABELTRACE_ITERATOR_INTERNAL_H */