105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2009, Digium, Inc.
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*
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* Mark Michelson <mmichelson@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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* \brief "smart" channels
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*
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* \author Mark Michelson <mmichelson@digium.com>
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/autochan.h"
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#include "asterisk/utils.h"
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#include "asterisk/linkedlists.h"
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#include "asterisk/options.h"
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#include "asterisk/channel.h"
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struct ast_autochan *ast_autochan_setup(struct ast_channel *chan)
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{
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struct ast_autochan *autochan;
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if (!chan) {
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return NULL;
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}
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if (!(autochan = ast_calloc(1, sizeof(*autochan)))) {
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return NULL;
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}
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ast_mutex_init(&autochan->lock);
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autochan->chan = ast_channel_ref(chan);
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ast_debug(1, "Created autochan %p to hold channel %s (%p)\n",
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autochan, ast_channel_name(chan), chan);
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/* autochan is still private, no need for ast_autochan_channel_lock() */
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ast_channel_lock(autochan->chan);
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AST_LIST_INSERT_TAIL(ast_channel_autochans(autochan->chan), autochan, list);
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ast_channel_unlock(autochan->chan);
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return autochan;
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}
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void ast_autochan_destroy(struct ast_autochan *autochan)
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{
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struct ast_autochan *autochan_iter;
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ast_autochan_channel_lock(autochan);
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AST_LIST_TRAVERSE_SAFE_BEGIN(ast_channel_autochans(autochan->chan), autochan_iter, list) {
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if (autochan_iter == autochan) {
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AST_LIST_REMOVE_CURRENT(list);
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ast_debug(1, "Removed autochan %p from the list, about to free it\n", autochan);
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break;
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}
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}
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AST_LIST_TRAVERSE_SAFE_END;
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ast_autochan_channel_unlock(autochan);
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autochan->chan = ast_channel_unref(autochan->chan);
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ast_mutex_destroy(&autochan->lock);
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ast_free(autochan);
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}
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void ast_autochan_new_channel(struct ast_channel *old_chan, struct ast_channel *new_chan)
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{
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struct ast_autochan *autochan;
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AST_LIST_APPEND_LIST(ast_channel_autochans(new_chan), ast_channel_autochans(old_chan), list);
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/* Deadlock avoidance is not needed since the channels are already locked. */
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AST_LIST_TRAVERSE(ast_channel_autochans(new_chan), autochan, list) {
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ast_mutex_lock(&autochan->lock);
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if (autochan->chan == old_chan) {
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autochan->chan = ast_channel_ref(new_chan);
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ast_channel_unref(old_chan);
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ast_debug(1, "Autochan %p used to hold channel %s (%p) but now holds channel %s (%p)\n",
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autochan, ast_channel_name(old_chan), old_chan, ast_channel_name(new_chan), new_chan);
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}
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ast_mutex_unlock(&autochan->lock);
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}
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}
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