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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: 3.0.0
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Component/s: WiredTiger
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None
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Fully Compatible
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ALL
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The function __wt_cond_wait waits a conditional variable for usecs microseconds or for ever if the variable is zero. However, the implementation can lead to unexpected infinite wait if usecs become negative.
if (usecs > 0) {
milliseconds = usecs / 1000;
/*
* 0 would mean the CV sleep becomes a TryCV which we do not
* want
*/
if (milliseconds == 0)
milliseconds = 1;
ret = SleepConditionVariableCS(
&cond->cond, &cond->mtx, milliseconds);
} else
ret = SleepConditionVariableCS(
&cond->cond, &cond->mtx, INFINITE);
This can be fixed by reviewing the code and using unsigned values for milliseconds (as it should be a DWORD cf MSDN)
DWORD milliseconds; // .... code removed for clarity .... if (usecs == 0) { ret = SleepConditionVariableCS( &cond->cond, &cond->mtx, INFINITE); } else //if (usecs > 0) { milliseconds = ((unsigned long)usecs) / 1000UL; /* * 0 would mean the CV sleep becomes a TryCV which we do not * want */ if (milliseconds == 0) milliseconds = 1; ret = SleepConditionVariableCS( &cond->cond, &cond->mtx, milliseconds); }