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vehicle_time: Deliver VehicleClock callbacks from a worker thread - #215

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florianfueller:feature/59-vehicle-clock-callback-delivery
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vehicle_time: Deliver VehicleClock callbacks from a worker thread#215
florianfueller wants to merge 4 commits into
eclipse-score:mainfrom
florianfueller:feature/59-vehicle-clock-callback-delivery

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@florianfueller

@florianfueller florianfueller commented Sep 8, 2026 •
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The Set/Unset callback methods of VehicleClockBackendImpl were no-ops.
Callbacks are now delivered by a worker thread that polls the
TimeDaemon shared memory every 50 ms:

  • The thread starts with the first registered callback after Init()
    and runs until the backend is destroyed. While no callback is
    registered it sleeps.
  • A callback receives the first snapshot polled after its registration
    and afterwards only changes of its part of the snapshot:
    TimeSlaveSyncData and PDelayMeasurementData on any change,
    VehicleTimeStatus only when the flags change (rate deviation
    excluded).
  • Set/Unset are safe against in-flight invocations, also from inside a
    callback; Unset returns only after a running invocation finished.

Add unit tests, update the docs and remove the "not yet delivered"
warnings.

closes #59 (improvement ticket)

@github-project-automation github-project-automation Bot moved this to In Progress in TIM - Time FT Sep 8, 2026
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github-actions Bot commented Sep 8, 2026 •
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License Check Results

🚀 The license check job ran with the Bazel command:

bazel run //:license-check

Status: ⚠️ Needs Review

Click to expand output 
[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.6.0) and connecting to it...
INFO: Invocation ID: 7c8113cb-1e59-4c9a-875f-b6a4522526c9
Computing main repo mapping: 
Computing main repo mapping: 
WARNING: For repository 'platforms', the root module requires module version platforms@1.0.0, but got platforms@1.1.0 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
WARNING: For repository 'score_platform', the root module requires module version score_platform@0.7.1, but got score_platform@0.7.2 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
WARNING: For repository 'rules_oci', the root module requires module version rules_oci@2.2.7, but got rules_oci@2.3.0 in the resolved dependency graph. Please update the version in your MODULE.bazel or set --check_direct_dependencies=off
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
Loading: 
Loading: 3 packages loaded
WARNING: Target pattern parsing failed.
ERROR: Skipping '//:license-check': no such target '//:license-check': target 'license-check' not declared in package '' defined by /home/runner/work/time/time/BUILD
ERROR: no such target '//:license-check': target 'license-check' not declared in package '' defined by /home/runner/work/time/time/BUILD
INFO: Elapsed time: 11.211s
INFO: 0 processes.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target

@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from d4f4e67 to 143d1fb Compare September 9, 2026 07:57
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from 143d1fb to d447876 Compare September 9, 2026 11:18
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from d447876 to a816147 Compare September 9, 2026 12:37
@florianfueller
florianfueller marked this pull request as ready for review September 9, 2026 12:38
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from c811e27 to 041c9b8 Compare September 23, 2026 06:56
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from 041c9b8 to 4448f49 Compare September 23, 2026 07:42
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from 4448f49 to 756eaad Compare September 23, 2026 08:06
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from 756eaad to 28b62ff Compare September 23, 2026 08:32
@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from e5731ec to 150c89a Compare October 7, 2026 13:03
lavrovvalera
lavrovvalera reviewed Oct 7, 2026
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Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_dispatcher.cpp Outdated
const auto status_flags = ConvertPtpStatus(snapshot.value().status);
score::cpp::ignore =
status_slot_.InvokeIfChanged(status_flags, VehicleTimeStatus{status_flags, snapshot.value().rate_deviation});
score::cpp::ignore = sync_data_slot_.TryDeliverChangedData(ConvertSyncData(snapshot.value().sync_fup_data));

@lavrovvalera lavrovvalera Oct 7, 2026

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why do we need still to ignore the result?
regarding the returning result.
I think, the point, the callback was executed or nto is indeed not interesting.
but if the callback will return some result and we can react on it - that might be interesting.
but do we need this thing?
one of the use case - the callback could return if the registration shall still be hold.
so, if it will return true - continue calling it, false - drop the subscription.

if not, I would propose to drop the return at all.

@florianfueller florianfueller Oct 8, 2026

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Return dropped.

Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_dispatcher.cpp

void SvtCallbackDispatcher::PollAndDispatch() noexcept
{
const auto snapshot = svt_receiver_->Receive();

@lavrovvalera lavrovvalera Oct 7, 2026

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then we need to investigate before we will merge it

Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_wrapper.h Outdated
template <typename Timebase>
bool IsSameForDelivery(const TimeSlaveSyncData<Timebase>& first, const TimeSlaveSyncData<Timebase>& second) noexcept
{
const bool same_precise_origin_timestamp = (first.precise_origin_timestamp == second.precise_origin_timestamp);

@lavrovvalera lavrovvalera Oct 7, 2026

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why the default instantiation doesn't fit here?

@florianfueller florianfueller Oct 8, 2026

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Implemented operator==

Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_wrapper.h Outdated
bool IsSameForDelivery(const PDelayMeasurementData<Timebase>& first,
const PDelayMeasurementData<Timebase>& second) noexcept
{
const bool same_request_origin_timestamp = (first.request_origin_timestamp == second.request_origin_timestamp);

@lavrovvalera lavrovvalera Oct 7, 2026

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why the default instantiation doesn't fit here?

@florianfueller florianfueller Oct 8, 2026

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Implemented operator==

Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_wrapper.h Outdated
/// @brief Thread-safe holder for a single move-only callback that is invoked from a dedicated worker thread
/// @brief Delivery comparison for types that already provide @c operator==.
template <typename Value>
bool IsSameForDelivery(const Value& first, const Value& second) noexcept

@lavrovvalera lavrovvalera Oct 7, 2026

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Not sure, I can understand the function name

@florianfueller florianfueller Oct 8, 2026

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Changed to IsSame

Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_wrapper.h Outdated
/// @return @c true if the callback was invoked, @c false if none is installed or @p data is unchanged.
template <typename Argument>
bool InvokeIfChanged(const Data& data, const Argument& argument) noexcept
bool TryDeliverChangedData(const Data& data) noexcept

@lavrovvalera lavrovvalera Oct 7, 2026

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is it a delivery?
Maybe TryToEnvoke() or somehting?
also the user of this function doesn't know, what the "new" data is.
he jsut has the "data"

@florianfueller florianfueller Oct 8, 2026

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Renamed to TryToEnvoke

Comment thread score/time/vehicle_time/src/details/td_impl/svt_callback_wrapper.h Outdated
std::recursive_mutex mutex_;
std::shared_ptr<Callback> callback_{};
std::optional<Data> last_data_{};
// Mirrors callback_ != nullptr. Written only under mutex_, read lock-free by IsSet().

@lavrovvalera lavrovvalera Oct 7, 2026

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I don't think, we need this comment

@florianfueller florianfueller Oct 8, 2026

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Removed

@florianfueller
florianfueller force-pushed the feature/59-vehicle-clock-callback-delivery branch from 22c6f71 to 0eee42c Compare October 8, 2026 11:37
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Documentation preview for this pull request is available at:
pr-215: https://eclipse-score.github.io/time/pr-215/

This branch was successfully deployed

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workflow-approval — 3a07fb4d Deployed Oct 8, 2026 by florianfueller via qnx-build (x86_64-qnx) / approval #924
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Improvement: Implement the callbacks envoking

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