Книга: Real-Time Concepts for Embedded Systems

8.6 Points to Remember

8.6 Points to Remember

Some points to remember include the following:

· Pipes provide unstructured data exchange between tasks.

· The select operation is allowed on pipes.

· Event registers can be used to communicate application-defined events between tasks.

· Events of the same type are not accumulated in the event register.

· The occurrence of an event in the event register does not change the execution state of the receiving task, unless the task is already waiting on that event.

· Tasks receive signals synchronously.

· The occurrence of a signal changes the execution state of the receiving task.

· Signals can be handled by user-defined actions or by system-defined default actions.

· Multiple occurrences of the same signal are not cumulative.

· A condition variable allows one task to wait until another task has placed a shared resource in a desired state or condition.

· A condition variable is used to synchronize between tasks but is not used as a mechanism to synchronize access to shared resources.

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