OsReleaseSignals (void)
{
#ifdef SIG_BLOCK
    if (--BlockedSignalCount == 0)
    {
	sigprocmask (SIG_SETMASK, &PreviousSignalMask, 0);
    }
#endif
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.