Time Component Requirements#

Time Requirements		status: valid security: NO safety: ASIL_B
tags: requirements, time, time version: 1 realizes: wp__requirements_comp

doc__time_requirements		Generic Document

Functional Requirements#

Unified clock facade across time domains		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/clock/src/clock.h:96 version: 1 derived from: feat_req__time__abs_base_api, feat_req__time__high_res_clock_api, feat_req__time__monotonic_clock_api, feat_req__time__vehicle_time_time_api satisfied by: comp__time
The Component shall provide a single type-safe accessor for all supported clock domains that prevents mixing time values from different domains by rejecting domain-mismatched operations at compile time when accessing time snapshots.
comp_req__time__unified_clock_facade		Component Requirement

Immutable snapshot with quality metadata		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/clock/src/clock.h:116 version: 1 derived from: feat_req__time__vehicle_time_time_api satisfied by: comp__time
The Component shall return a single immutable value that bundles the timepoint with the domain’s synchronization and quality metadata, so callers observe state that cannot change after creation and can determine time validity without a separate status query.
comp_req__time__snapshot_with_status		Component Requirement

Explicit lifecycle for backends that need it		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/clock/src/clock.h:154; score/time/clock/src/clock.h:165; score/time/clock/src/clock.h:181 version: 1 derived from: feat_req__time__vehicle_time_ctrl_flow satisfied by: comp__time
The Component shall provide initialization, availability-check, and availability-wait operations for clock domains that depend on external resources, and shall cause compilation failure when those operations are invoked on clock domains that are always ready.
comp_req__time__explicit_lifecycle		Component Requirement

VehicleClock returns snapshot with status		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/vehicle_time/src/vehicle_clock.cpp:44 version: 1 derived from: feat_req__time__vehicle_time_time_api satisfied by: comp__time
The Component shall read the vehicle time timepoint and its status atomically from the backend within a single backend operation, so downstream callers observe consistent time and status values.
comp_req__vehicle_time__snapshot		Component Requirement

VehicleClock lifecycle operations		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/vehicle_time/src/vehicle_clock.cpp:50; score/time/vehicle_time/src/vehicle_clock.cpp:56; score/time/vehicle_time/src/vehicle_clock.cpp:62 version: 1 derived from: feat_req__time__vehicle_time_ctrl_flow satisfied by: comp__time
The Component shall delegate initialization and availability checks to the backend and shall report backend init failure and availability-wait timeouts to the caller without blocking indefinitely.
comp_req__vehicle_time__lifecycle		Component Requirement

HighResSteadyClock always-ready snapshot		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/high_res_steady_time/src/high_res_steady_clock.cpp:21 version: 1 derived from: feat_req__time__high_res_clock_api satisfied by: comp__time
The Component shall provide steady high-resolution time snapshots without requiring prior initialization.
comp_req__high_res_steady_time__snapshot		Component Requirement

SteadyClock always-ready snapshot		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/steady_time/src/steady_clock.cpp:21 version: 1 derived from: feat_req__time__monotonic_clock_api satisfied by: comp__time
The Component shall provide steady time snapshots without requiring prior initialization, and shall cause compilation failure when initialization or availability operations are invoked on the steady time domain.
comp_req__steady_time__snapshot		Component Requirement

SystemClock always-ready snapshot		status: valid security: NO safety: ASIL_B
tags: time reqtype: Functional source_code_link: score/time/system_time/src/system_clock.cpp:21 version: 1 derived from: feat_req__time__abs_base_api satisfied by: comp__time
The Component shall provide system time snapshots without requiring prior initialization, and shall cause compilation failure when initialization or availability operations are invoked on the system time domain.
comp_req__system_time__snapshot		Component Requirement

Supported platforms		status: valid security: NO safety: ASIL_B
tags: time reqtype: Non-Functional version: 1 satisfied by: comp__time
The Component shall build and run on Linux and QNX host platforms, providing platform-specific backends where the underlying OS APIs differ.
comp_req__time__supported_platforms		Component Requirement

Backend initialization by the user		status: valid security: NO safety: ASIL_B
tags: time reqtype: Process version: 1
The Component User shall initialize the backends for clock domains that require initialization before requesting time snapshots from those domains.
aou_req__time__user_initializes_backend		Assumption of Use Requirement