[asterisk-dev] [Code Review] 4502: Improved and portable ast_log recursion avoidance

[Corey Farrell]

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Before committing I found a link error for utils/refcounter due to the ast_log_safe symbol not existing.  I've duplicated the ast_log function found in that file.  The refcounter utility is only used for old style REF_DEBUG files, and 11 is the only current version that still has it.

- Corey Farrell


On March 24, 2015, 6:05 p.m., Corey Farrell wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://reviewboard.asterisk.org/r/4502/
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> (Updated March 24, 2015, 6:05 p.m.)
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> 
> Review request for Asterisk Developers.
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> Bugs: ASTERISK-24155
>     https://issues.asterisk.org/jira/browse/ASTERISK-24155
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> Repository: Asterisk
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> Description
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> This introduces a new logger routine ast_log_safe.  This routine should be used for all error messages in code that can be run as a result of ast_log.  ast_log_safe does nothing if run recursively or from the logger thread.  All error logging in astobj2.c, strings.c and utils.h have been switched to ast_log_safe.  One ast_log from stringfields code in utils.c was also changed.
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> I've also added support for raw threadstorage.  This provides direct access to the void* pointer in threadstorage.  In ast_log_safe I use NULL to signify that this thread is not already running ast_log_safe, (void*)1 when it is already running.  This was done since it's critical that ast_log_safe do nothing that could log during recursion checking.
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> This review shows the version 13 patch.  Version 11 didn't have the backtrace check for MALLOC_FAILURE_MSG, and trunk uses 'ast_callid' instead of 'struct ast_callid *'.  Patches for each version are on JIRA.
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> The idea to use threadstorage to protect certain error logging came from the patch posted by Timo Teräs.
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> Diffs
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>   /branches/13/main/utils.c 433360 
>   /branches/13/main/strings.c 433360 
>   /branches/13/main/logger.c 433360 
>   /branches/13/main/hashtab.c 433360 
>   /branches/13/main/astobj2.c 433360 
>   /branches/13/include/asterisk/utils.h 433360 
>   /branches/13/include/asterisk/threadstorage.h 433360 
>   /branches/13/include/asterisk/logger.h 433360 
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> Diff: https://reviewboard.asterisk.org/r/4502/diff/
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> Testing
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> Verified with 'nm -g main/astobj2.o' that ast_log_safe was being used.
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> Tested by further modifying Asterisk with added calls to ast_log_safe().
> * In main() after fully booted.
> * In ast_log_safe() after setting in_safe_log.
> * From the logger thread.
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> Only the message after fully booted was shown in the logs, all others were ignored.
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> Thanks,
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> Corey Farrell
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