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Bug#27198: Error returns from time() are ignored

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gettimeofday() can fail and presumably, so can time().
Keep an eye on it.

Since we have no data on this at all so far, we just
retry on failure (and log the event), assuming that
this is just an intermittant failure. This might of
course hang the threat until we succeed. Once we know
more about these failures, an appropriate more clever
scheme may be picked (only try so many times per thread,
etc., if that fails, return last "good" time() we got or
some such).  Using sql_print_information() to log as this
probably only occurs in high load scenarios where the debug-
trace likely is disabled (or might interfere with testing
the effect).  No test-case as this is a non-deterministic
issue.
This commit is contained in:
tnurnberg@sin.intern.azundris.com
2007-07-13 17:50:58 +02:00
parent 7c4385c4ad
commit 5cbe511f3b
2 changed files with 29 additions and 14 deletions
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26
sql/sql_class.h
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@@ -569,17 +569,33 @@ public:
proc_info = old_msg;
pthread_mutex_unlock(&mysys_var->mutex);
}
static inline void safe_time(time_t *t)
{
/**
Wrapper around time() which retries on error (-1)
@details
This is needed because, despite the documentation, time() may fail
in some circumstances. Here we retry time() until it succeeds, and
log the failure so that performance problems related to this can be
identified.
*/
while(unlikely(time(t) == ((time_t) -1)))
sql_print_information("time() failed with %d", errno);
}
inline time_t query_start() { query_start_used=1; return start_time; }
inline void set_time() { if (user_time) start_time=time_after_lock=user_time; else time_after_lock=time(&start_time); }
inline void end_time() { time(&start_time); }
inline void set_time() { if (user_time) start_time=time_after_lock=user_time; else { safe_time(&start_time); time_after_lock= start_time; }}
inline void end_time() { safe_time(&start_time); }
inline void set_time(time_t t) { time_after_lock=start_time=user_time=t; }
inline void lock_time() { time(&time_after_lock); }
inline void lock_time() { safe_time(&time_after_lock); }
inline void insert_id(ulonglong id)
{ last_insert_id=id; insert_id_used=1; }
inline ulonglong insert_id(void)
{
if (!last_insert_id_used)
{
{
last_insert_id_used=1;
current_insert_id=last_insert_id;
}
@@ -588,7 +604,7 @@ public:
inline ulonglong found_rows(void)
{
return limit_found_rows;
}
}
inline bool active_transaction()
{
#ifdef USING_TRANSACTIONS