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22. Signals: Advanced Features > Realtime Signals

Realtime Signals

Realtime signals were defined in POSIX.1b to remedy a number of limitations of standard signals. They have the following advantages over standard signals:

  • Realtime signals provide an increased range of signals that can be used for application-defined purposes. Only two standard signals are freely available for application-defined purposes: SIGUSR1 and SIGUSR2.

  • Realtime signals are queued. If multiple instances of a realtime signal are sent to a process, then the signal is delivered multiple times. By contrast, if we send further instances of a standard signal that is already pending for a process, that signal is delivered only once.


  

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