[asterisk-dev] [Code Review] Don't run the atexit functions more than once

[Terry Wilson]

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https://reviewboard.asterisk.org/r/1658/
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Review request for Asterisk Developers, wdoekes and Matt Jordan.


Summary
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Asterisk can get multiple calls to the quit_handler from different threads. This can result in the atexit functions running multiple times. In one case, this causes multiple calls to the xmlCleanupParser() function which causes a double free and crash. I initially tried to handle things in quit_handler, but only succeeded in making some consoles never exit. :-)


This addresses bug ASTERISK-18883.
    https://issues.asterisk.org/jira/browse/ASTERISK-18883


Diffs
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  /branches/1.8/main/asterisk.c 349967 

Diff: https://reviewboard.asterisk.org/r/1658/diff


Testing
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Threw tons of asterisk -rx "core stop gracefully" calls in a loop at a bunch of 'asterisk -vvvgc' instances that were also starting in loops until it crashed. After the patch, it stopped crashing.


Thanks,

Terry

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