A0DefaultScheduling

The default thread scheduling rule.

Syntax

Description

This global variable contains the Athapascan-0 default thread scheduling rule. The scheduling rules of Athapascan-0 have different priorities between each other and the scheduling policy for each rule is different. The rules are the same supplied by Posix threads. There are four possible scheduling rules, presented in order of priority:

• A0FifoScheduling: Run to completion or blocking of the thread. Higher priority threads are scheduled before lower priority ones.
• A0RRScheduling: Round-robin with priorities to execute. A thread of lower priority is only scheduled when all higher priority ones are blocked or completed.
• A0OtherScheduling: Any vendor-specific implemented scheduling. Unfortunately, this is the only that exists in every implementation.

To the user programs find out which scheduling is supported by the version of the Athapascan-0 library being used, there are some predefined macros. They exist only when their counterpart scheduling is supported. They are as follows:

• A0HasFifoScheduling
• A0HasRRScheduling
• A0HasOtherScheduling

See Also

a0SetDefaultScheduling() a0NewService() a0GetThreadScheduling() a0SetThreadScheduling() A0DefaultPriority