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Betriebssystem-Konzepte | ||
======================= | ||
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Tasks, Threads und Prozesse | ||
--------------------------- | ||
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\colBegin{0.6} | ||
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* Prozesse und Threads sind *OS-Features* | ||
* Tasks werden durch das (eigene) *SW-Framework* definiert | ||
* Threads und Prozesse bedeuten *Overhead*: Stack, Context-Switch, Synchronisierung | ||
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\vspace{0.5cm} | ||
Speicher | ||
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* Alle Threads können auf gesamten *Prozess-Speicher* zugreifen | ||
* Prozesse können untereinander *nicht auf Speicher* zugreifen. | ||
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\colNext{0.4} | ||
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![process_threads](images/process_threads.pdf) | ||
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\colEnd | ||
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Was ist ein Real-Time-OS (RTOS)? | ||
-------------------------------- | ||
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\colBegin{0.5} | ||
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Time-Sharing OS | ||
\vspace{0.2cm} | ||
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* *Mehrere Prozesse* mit virtuellem Memory (MMU) | ||
* *Präemptives Scheduling* für Prozesse und Threads | ||
* *Dynamisches* zeitliches Verhalten des Schedulers | ||
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\colNext{0.5} | ||
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Bare Metal | ||
\vspace{0.2cm} | ||
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* Nur *ein Prozess* | ||
* Meist nur *kooperatives Scheduling* für Tasks (Event-Loop) | ||
* *Direkte Verwendung* von Timer-Interrupts für die Einhaltung von Echtzeitverhalten | ||
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\colEnd | ||
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\vspace{0.6cm} | ||
\colBegin{0.25} | ||
\colNext{0.5} | ||
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Real-Time OS | ||
\vspace{0.2cm} | ||
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* Nur *ein Prozess* aber mit Threads | ||
* *Präemptives Scheduling* für Threads/Tasks | ||
* *Scheduler* kümmert sich um die Einhaltung von Echtzeitverhalten | ||
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\colNext{0.25} | ||
\colEnd | ||
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