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Improved and portable ast_log recursion avoidance

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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.  All error logging in
astobj2.c, strings.c and utils.h have been switched to ast_log_safe.

This required adding support for raw threadstorage.  This provides direct
access to the void* pointer in threadstorage.  In ast_log_safe, NULL is used
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.

ASTERISK-24155 #close
Reported by: Timo Teräs
Review: https://reviewboard.asterisk.org/r/4502/
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Merged revisions 433522 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 433523 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433524 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Corey Farrell
2015-03-27 07:12:25 +00:00
parent 554eb74516
commit 28e3bd0af7
7 changed files with 83 additions and 28 deletions
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40
include/asterisk/threadstorage.h
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@@ -84,6 +84,8 @@ void __ast_threadstorage_object_replace(void *key_old, void *key_new, size_t len
AST_THREADSTORAGE_CUSTOM_SCOPE(name, NULL, ast_free_ptr,)
#define AST_THREADSTORAGE_EXTERNAL(name) \
extern struct ast_threadstorage name
#define AST_THREADSTORAGE_RAW(name) \
AST_THREADSTORAGE_CUSTOM_SCOPE(name, NULL, NULL,)
/*!
* \brief Define a thread storage variable, with custom initialization and cleanup
@@ -216,4 +218,42 @@ void *__ast_threadstorage_get(struct ast_threadstorage *ts, size_t init_size, co
#define ast_threadstorage_get(ts, init_size) __ast_threadstorage_get(ts, init_size, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#endif /* defined(DEBUG_THREADLOCALS) */
/*!
* \brief Retrieve a raw pointer from threadstorage.
* \param ts Threadstorage object to operate on.
*
* \return A pointer associated with the current thread, NULL
* if no pointer is associated yet.
*
* \note This should only be used on threadstorage declared
* by AST_THREADSTORAGE_RAW unless you really know what
* you are doing.
*/
AST_INLINE_API(
void *ast_threadstorage_get_ptr(struct ast_threadstorage *ts),
{
pthread_once(&ts->once, ts->key_init);
return pthread_getspecific(ts->key);
}
)
/*!
* \brief Set a raw pointer from threadstorage.
* \param ts Threadstorage object to operate on.
*
* \retval 0 Success
* \retval non-zero Failure
*
* \note This should only be used on threadstorage declared
* by AST_THREADSTORAGE_RAW unless you really know what
* you are doing.
*/
AST_INLINE_API(
int ast_threadstorage_set_ptr(struct ast_threadstorage *ts, void *ptr),
{
pthread_once(&ts->once, ts->key_init);
return pthread_setspecific(ts->key, ptr);
}
)
#endif /* ASTERISK_THREADSTORAGE_H */