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Add notes to autoservice and pbx doxygen regarding a potential

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deadlock scenario so that it is avoided in the future



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@164416 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Michelson
2008-12-15 19:45:07 +00:00
parent 2850bf37a9
commit a43cf62956
2 changed files with 25 additions and 0 deletions
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5
include/asterisk/channel.h
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@@ -1187,6 +1187,11 @@ int ast_autoservice_start(struct ast_channel *chan);
/*!
* \brief Stop servicing a channel for us...
*
* \note if chan is locked prior to calling ast_autoservice_stop, it
* is likely that there will be a deadlock between the thread that calls
* ast_autoservice_stop and the autoservice thread. It is important
* that chan is not locked prior to this call
*
* \retval 0 success
* \retval -1 error, or the channel has been hungup
*/

20
include/asterisk/pbx.h
View File

@@ -383,6 +383,10 @@ int ast_get_hint(char *hint, int maxlen, char *name, int maxnamelen,
* \param priority priority of the action within the extension
* \param callerid callerid to search for
*
* \note It is possible for autoservice to be started and stopped on c during this
* function call, it is important that c is not locked prior to calling this. Otherwise
* a deadlock may occur
*
* \return If an extension within the given context(or callerid) with the given priority
* is found a non zero value will be returned. Otherwise, 0 is returned.
*/
@@ -398,6 +402,10 @@ int ast_exists_extension(struct ast_channel *c, const char *context, const char
* \param label label of the action within the extension to match to priority
* \param callerid callerid to search for
*
* \note It is possible for autoservice to be started and stopped on c during this
* function call, it is important that c is not locked prior to calling this. Otherwise
* a deadlock may occur
*
* \return the priority which matches the given label in the extension or -1 if not found.
*/
int ast_findlabel_extension(struct ast_channel *c, const char *context,
@@ -406,6 +414,10 @@ int ast_findlabel_extension(struct ast_channel *c, const char *context,
/*!
* \brief Find the priority of an extension that has the specified label
*
* \note It is possible for autoservice to be started and stopped on c during this
* function call, it is important that c is not locked prior to calling this. Otherwise
* a deadlock may occur
*
* \note This function is the same as ast_findlabel_extension, except that it accepts
* a pointer to an ast_context structure to specify the context instead of the
* name of the context. Otherwise, the functions behave the same.
@@ -422,6 +434,10 @@ int ast_findlabel_extension2(struct ast_channel *c, struct ast_context *con,
* \param priority priority of extension path
* \param callerid callerid of extension being searched for
*
* \note It is possible for autoservice to be started and stopped on c during this
* function call, it is important that c is not locked prior to calling this. Otherwise
* a deadlock may occur
*
* \return If "exten" *could be* a valid extension in this context with or without
* some more digits, return non-zero. Basically, when this returns 0, no matter
* what you add to exten, it's not going to be a valid extension anymore
@@ -438,6 +454,10 @@ int ast_canmatch_extension(struct ast_channel *c, const char *context,
* \param priority priority of extension path
* \param callerid callerid of extension being searched for
*
* \note It is possible for autoservice to be started and stopped on c during this
* function call, it is important that c is not locked prior to calling this. Otherwise
* a deadlock may occur
*
* \return If "exten" *could match* a valid extension in this context with
* some more digits, return non-zero. Does NOT return non-zero if this is
* an exact-match only. Basically, when this returns 0, no matter