System Calls for Real Time Signals

Since the system calls previously examined apply only to standard signals, additional system calls must be introduced to allow User Mode processes to handle real-time signals.

Several system calls for real-time signals (rt sigaction( ), rt sigpending( ), rt_sigprocmask( ), and rt_sigsuspend( )) are similar to those described earlier and won't be discussed further. For the same reason, we won't discuss two other system calls that deal with queues of real-time signals:

rt_sigqueueinfo( )

Sends a real-time signal so that it is added to the pending signal queue of the rt sigtimedwait( )

Dequeues a blocked pending signal without delivering it and returns the signal number to the caller; if no blocked signal is pending, suspends the current process for a fixed amount of time.

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