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69810b306d
This patch is part of a series to resolve deadlocks in chan_sip.c. Stopping a scheduled event can result in a deadlock if the scheduled event is running when you try to stop the event. If you hold a lock needed by the scheduled event while trying to stop the scheduled event then a deadlock can happen. The general strategy for resolving the deadlock potential is to push the actual starting and stopping of the scheduled events off onto the scheduler/do_monitor() thread by scheduling an immediate one shot scheduled event. Some restructuring may be needed because the code may assume that the start/stop of the scheduled events is immediate. * Fix clearing autokillid in __sip_autodestruct() even though we could reschedule. ASTERISK-25023 Change-Id: I450580dbf26e2e3952ee6628c735b001565c368f
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2010, Digium, Inc.
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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 sip dialog management header file
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*/
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#include "sip.h"
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#ifndef _SIP_DIALOG_H
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#define _SIP_DIALOG_H
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/*! \brief
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* when we create or delete references, make sure to use these
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* functions so we keep track of the refcounts.
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* To simplify the code, we allow a NULL to be passed to dialog_unref().
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*/
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#define dialog_ref(dialog, tag) ao2_t_bump(dialog, tag)
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#define dialog_unref(dialog, tag) ({ ao2_t_cleanup(dialog, tag); (NULL); })
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struct sip_pvt *__sip_alloc(ast_string_field callid, struct ast_sockaddr *sin,
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int useglobal_nat, const int intended_method, struct sip_request *req, ast_callid logger_callid,
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const char *file, int line, const char *func);
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#define sip_alloc(callid, addr, useglobal_nat, intended_method, req, logger_callid) \
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__sip_alloc(callid, addr, useglobal_nat, intended_method, req, logger_callid, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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/*!
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* \brief Schedule final destruction of SIP dialog.
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*
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* \note This cannot be canceled.
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*
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* \details
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* This function is used to keep a dialog around for a period of time in order
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* to properly respond to any retransmits.
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*/
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void sip_scheddestroy_final(struct sip_pvt *p, int ms);
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/*! \brief Schedule destruction of SIP dialog */
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void sip_scheddestroy(struct sip_pvt *p, int ms);
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/*! \brief Cancel destruction of SIP dialog. */
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void sip_cancel_destroy(struct sip_pvt *pvt);
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/*!
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* \brief Unlink a dialog from the dialogs container, as well as any other places
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* that it may be currently stored.
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*
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* \note A reference to the dialog must be held before calling
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* this function, and this function does not release that
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* reference.
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*
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* \note The dialog must not be locked when called.
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*/
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void dialog_unlink_all(struct sip_pvt *dialog);
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/*! \brief Acknowledges receipt of a packet and stops retransmission
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* called with p locked*/
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int __sip_ack(struct sip_pvt *p, uint32_t seqno, int resp, int sipmethod);
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/*! \brief Pretend to ack all packets
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* called with p locked */
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void __sip_pretend_ack(struct sip_pvt *p);
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/*! \brief Acks receipt of packet, keep it around (used for provisional responses) */
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int __sip_semi_ack(struct sip_pvt *p, uint32_t seqno, int resp, int sipmethod);
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#endif /* defined(_SIP_DIALOG_H) */
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