Thread Scheduling

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ZEP-SRS-2-

Type	Level	UID	STATUS	TYPE	COMPONENT	REFS	Title	Statement	USER_STORY
TEXT								SPDX-License-Identifier: Apache-2.0
SECTION	1						Thread Scheduling
REQUIREMENT	1.1	ZEP-SRS-2-1	Draft	Functional	Multi Core		ZEP-SRS-2-1 Support operation on more than one CPU	The Zephyr RTOS shall support operation on more than one physical CPU sharing the same kernel state.
REQUIREMENT	1.2	ZEP-SRS-2-2	Draft	Functional	Multi Core		ZEP-SRS-2-2 Running threads on specific CPUs	The Zephyr RTOS shall provide an interface for running threads on specific sets of CPUs ( default is 1 CPU).	As a Zephyr RTOS user I want Zephyr OS to be able to specify the CPU core or the set of CPU cores on which a thread shall be executed.
REQUIREMENT	1.3	ZEP-SRS-2-3	Draft	Functional	Multi Core		ZEP-SRS-2-3 Exclusion between physical CPUs	The Zephyr RTOS shall provide an interface for mutual exclusion between multiple physical CPUs.	As a Zephyr RTOS user I want Zephyr OS to provide synchronization mechanisms between the CPU cores and the access to common resources.
SECTION	2						Thread Scheduling
REQUIREMENT	2.1	ZEP-SRS-2-4	Draft	Functional	Thread Scheduling	Parents: ZEP-SYRS-15 Thread support	ZEP-SRS-2-4 Scheduling a thread based on an event	The Zephyr RTOS shall provide an interface to schedule a thread based on an event.	As a Zephyr RTOS user, I want to be able to execute work which reacts on events and interrupts the current executed work.
REQUIREMENT	2.2	ZEP-SRS-2-5	Draft	Functional	Thread Scheduling		ZEP-SRS-2-5 Deadline Scheduling Priorities	The Zephyr RTOS shall organize running threads by earliest deadline first priority.	As a Zephyr RTOS user, I want to be able to schedule threads by earliest deadline first.
REQUIREMENT	2.3	ZEP-SRS-2-6	Draft	Functional	Thread Scheduling		ZEP-SRS-2-6 Work Queue utility capable of running preemptible work items	The Zephyr RTOS shall provide a thread-pooled work queue utility capable of running preemptible work items with specific scheduler priorities.	As a Zephyr RTOS user, I want to be able to add work items in a thread work queue with different priorities and these shall be scheduled according their priorities.
REQUIREMENT	2.4	ZEP-SRS-2-7	Draft	Functional	Thread Scheduling		ZEP-SRS-2-7 Run user supplied functions in-order in a separate thread(s)	The Zephyr RTOS shall provide an interface for running user-supplied functions.	As a Zephyr RTOS user, I want to be able to run functions in-order in a separated thread/threads.
REQUIREMENT	2.5	ZEP-SRS-2-8	Draft	Functional	Thread Scheduling		ZEP-SRS-2-8 Organize running threads into a fixed list	The Zephyr RTOS shall organize running threads into a fixed list of numeric priorities.	As a Zephyr RTOS user, I want that the OS organize running threads in a fixed list of numeric priorities.
REQUIREMENT	2.6	ZEP-SRS-2-9	Draft	Functional	Thread Scheduling		ZEP-SRS-2-9 Preemption support	The Zephyr RTOS shall support preemption of a running thread by a higher priority thread.	As a Zephyr RTOS user, I want that the OS preempt running threads by a thread with higher priority.
REQUIREMENT	2.7	ZEP-SRS-2-10	Draft	Functional	Thread Scheduling		ZEP-SRS-2-10 Un-preemptible thread priorities	The Zephyr RTOS shall support thread priorities which cannot be preempted by other user threads.	As a Zephyr RTOS user, I want to be able to configure thread prioritizes which cannot be preempted by other user threads.
REQUIREMENT	2.8	ZEP-SRS-2-11	Draft	Functional	Thread Scheduling		ZEP-SRS-2-11 Time sharing of CPU resources	The Zephyr RTOS shall support time sharing of CPU resources among threads of the same priority.	As a Zephyr RTOS user, I want to be able to configure my RTOS in the way, that the CPU resources are shared evenly among executed threads of the same priority.