DEENESPTFRRUARHIKOZHNL

类 ara::exec::ExecutionClient

[SWS_EM_02001] Upstream: RS_EM_00103, RS_AP_00154, RS_AP_00150

class ExecutionClient final {...};

The ara::exec::ExecutionClient API provides the functionality for a Process to report its Execution State to the Execution Management.

Header-Datei#include "ara/exec/execution_client.h"
Forwarding-Header#include "ara/exec/exec_fwd.h"
Scopenamespace ara::exec

用户指南人工智能生成

允许进程向 Execution Management 报告其执行状态并拦截 SIGTERM 信号。
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译自德文指南gemini-3.8-flash-low · 2026-10-13 · 德文原文

允许进程向 Execution Management 报告其执行状态并拦截 SIGTERM 信号。

类 ara::exec::ExecutionClient 用于应用程序进程向 Execution Management 具有约束力地报告其内部执行状态([SWS_EM_02003])。在初始化时,它还负责拦截 SIGTERM 信号,并将其转发给后台线程中的自定义终止 Handler([SWS_EM_02562])。作为仅移动(Move-only)对象,该实例将其生命周期与信号处理严格绑定,并在销毁时恢复先前的信号状态。调用方必须确保注册的回调在整个实例生命周期内保持可调用状态。

上下文

类 ara::exec::ExecutionClient 用于 Adaptive Platform 上的进程向 Execution Management 报告其内部执行状态([SWS_EM_02003])。它充当正在运行的应用程序与中央进程管理之间的标准化接口。除了转发状态转换外,该实例还负责处理操作系统信号 SIGTERM([SWS_EM_02562]、[SWS_EM_02002])。在信号到达时,它会在单独的后台线程中执行用户定义的回调,以便应用程序进行有序终止([SWS_EM_02562])。解释:当请求终止执行单元时,操作系统或 Execution Management 可能会将信号 SIGTERM 发送给进程。 问题 Q-51eee947d01ae8b4 (未决)

ExecutionClientKontext app Applikationsprozess client ara::exec::ExecutionClient app->client Initialisierung & Statusmeldung client->app Aufruf terminationHandler em Execution Management client->em 状态传输 (IPC) os Betriebssystem (Signale) os->client SIGTERM

上下文图:应用程序进程、ExecutionClient、Execution Management 与信号机制之间的交互。来源:[SWS_EM_02003]、[SWS_EM_02562]、[SWS_EM_02002]。

生命周期

ara::exec::ExecutionClient 的实例化可以选择通过静态工厂方法 Create([SWS_EM_02562])或常规构造函数([SWS_EM_02560])进行。虽然 Create 是异常安全的(noexcept)并将结果封装在 ara::core::Result 中返回([SWS_EM_02562]),但常规构造函数声明为 noexcept(false)([SWS_EM_02560])。这两种创建路径都需要一个可调用的 std::function<void()> 回调作为参数(terminationHandler)。该回调必须在 ExecutionClient 实例的整个生命周期内保持有效且可调用([SWS_EM_02562]、[SWS_EM_02560])。

在所有权方面,该类被设计为仅移动(Move-only):拷贝构造函数([SWS_EM_02563])和拷贝赋值运算符([SWS_EM_02564])已被显式删除(delete)。实例的转移只能通过移动构造函数([SWS_EM_02580])和移动赋值运算符([SWS_EM_02581])进行,这两者均是异常安全的(noexcept),但不是线程安全的。工厂方法 Create 和构造函数本身被视为线程安全的([SWS_EM_02562]、[SWS_EM_02560])。

析构函数 ~ExecutionClient() 定义为 noexcept([SWS_EM_02002])且不是线程安全的。在销毁实例时,对信号 SIGTERM 的责任将被重新移交:析构函数将 SIGTERM 的信号 Handler 重置为实例化之前处于活动状态的原始状态([SWS_EM_02002])。

使用路径

常规流程分为初始化、状态传输和有序终止:

  • 创建:在进程运行时间开始时,通过 Create 初始化实例,并传入终止 Handler([SWS_EM_02562])。通常,该 Handler 会设置标志或向同步原语发出信号,以解除正在运行的线程的阻塞。
  • 状态报告:一旦进程就绪,它就会通过 ReportExecutionState 向 Execution Management 报告其执行状态([SWS_EM_02003])。该调用是线程安全的,可以从不同的工作线程中发起。
  • 信号接收与终止:如果在运行期间到达 SIGTERM 信号,ExecutionClient 会在后台线程中异步激活所保存的 terminationHandler([SWS_EM_02562])。进程有序完成未决任务。
  • 销毁:离开作用域时,析构函数恢复原始信号配置([SWS_EM_02002])。
状态报告与终止的典型流程ApplikationExecutionClientExecution ManagementCreate(terminationHandler)Result<ExecutionClient>ReportExecutionState(kRunning)发送状态报告接收确认Result<void>Use Case: 信号接收与终止Empfang von SIGTERMterminationHandler() (Hintergrund-Thread)Geordnetes Beenden~ExecutionClient()重置 SIGTERM 处理程序

时序图:从创建、状态报告到信号驱动终止的流程。来源:[SWS_EM_02562]、[SWS_EM_02003]、[SWS_EM_02002]。

错误场景

使用 ExecutionClient 时,不同的错误情况由来自 ara::exec::ExecErrc 的错误代码覆盖:

  • ara::exec::ExecErrc::kInvalidArgument:如果传入的 terminationHandler 对象不包含可调用函数,则在通过 Create([SWS_EM_02562])或常规构造函数([SWS_EM_02560])实例化时发生。系统应用回滚语义;若要修复,必须传入有效的 Callable。
  • ara::exec::ExecErrc::kNoCommunication:在应用程序进程与 Execution Management 之间存在通信错误时(例如未确认消息接收),无论在创建([SWS_EM_02562]、[SWS_EM_02560])还是在 ReportExecutionState([SWS_EM_02003])时都可能发生。此处不适用回滚语义;作为恢复措施,应重新尝试调用。
  • ara::exec::ExecErrc::kInvalidTransition:如果请求了不允许的状态转换,例如重新报告已处于活动状态的状态(如 kRunning),则由 ReportExecutionState([SWS_EM_02003])返回。由于该状态已被报告,因此无需重新传输(回滚语义)。

本指南基于 AUTOSAR Adaptive Platform 针对 exec 模块的规范(Release R25-11)。

成员图

构造函数和析构函数

2

运算符

1

类图

Hohle Dreieckspfeile = Vererbung (zeigt zur Basisklasse); Klicken öffnet die jeweilige Klassenseite.

G nara__exec__ExecutionClient880 ExecutionClient + ExecutionClient() + operator=() + ~ExecutionClient() + Create() + ReportExecutionState()

详细视图

请在大纲中选择一个条目。

构造函数和析构函数

Regular constructor for ExecutionClient.

重载 ExecutionClient 3
ExecutionClient (std::function< void()> terminationHandler) noexcept(false); SWS_EM_02560
ExecutionClient (const ExecutionClient &)=delete; SWS_EM_02563
ExecutionClient (ExecutionClient &&rval) noexcept; SWS_EM_02580

noexcept destructor

~ExecutionClient () noexcept;

方法

Create 函数

Named constructor for ExecutionClient.

static ara::core::Result< ExecutionClient > Create (std::function< void()> terminationHandler) noexcept;

Interface for a Process to report its internal state to Execution Management.

ara::core::Result< void > ReportExecutionState (ExecutionState state) noexcept;

运算符

operator= 函数 2

Suppress default copy assignment for ExecutionClient.

重载 = 2
ExecutionClient & operator= (const ExecutionClient &)=delete; SWS_EM_02564
ExecutionClient & operator= (ExecutionClient &&rval) noexcept; SWS_EM_02581

方法文档

函数 Create [SWS_EM_02562] Upstream: RS_AP_00119, RS_AP_00120, RS_AP_00128, RS_AP_00139, RS_AP_00144, RS_EM_00103, RS_AP_00159

static ara::core::Result< ExecutionClient > Create (std::function< void()> terminationHandler) noexcept;

Named constructor for ExecutionClient.

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译自德文指南gemini-3.8-flash-low · 2026-10-13 · 德文原文

静态函数 Create 用作实例化 ara::exec::ExecutionClient 的具名构造函数(Named Constructor)[SWS_EM_02562]。调用时传递回调 terminationHandler(类型为 std::function<void()>),该回调在 SIGTERM 信号到达时在后台线程中并发执行 [SWS_EM_02562]。通常,此回调会设置全局标志或唤醒被阻塞的线程,以启动有序终止(graceful termination)。调用方必须确保该处理程序在 ExecutionClient 实例的整个生命周期内保持可调用状态,在通过 std::bind 绑定到对象实例时尤其必须注意这一点 [SWS_EM_02562]。

作为返回值,该函数提供一个 ara::core::Result<ExecutionClient>,其中包含创建的实例或错误码 [SWS_EM_02562]。如果创建失败,定义了两种特定错误:

  • ara::exec::ExecErrc::kInvalidArgument:传入的 terminationHandler 不包含可调用的函数(回滚语义;通过传递有效的 Callable 来解决)[SWS_EM_02562]。
  • ara::exec::ExecErrc::kNoCommunication:发生了通信错误(无回滚语义;通过重试来解决)[SWS_EM_02562]。

该函数被声明为 noexcept,被视为 Exception-safe 以及 Thread-safe,并且可以在内部调用开发者定义的构造函数 [SWS_EM_02562]。解释:该调用想必通常在进程的早期初始化阶段进行,以便在主工作负载开始之前及时建立信号处理。 问题 Q-555aea895feb2123 (未决)这种带有回调注册的具名构造函数模式与通过其自身的 Create 函数创建 StateClient 相对应 [SWS_EM_02276]。

此文本由 AI 系统基于规范数据生成。

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient
Exception-Sicherheitexception safe
Thread-Sicherheitthread-safe

Parameter (in)

ParameterBeschreibung
terminationHandlerCallback which is called if ExecutionClient receives SIGTERM signal. The callback is executed in a background thread. A typical implementation of this callback will set a global flag (and potentially unblock other threads) to perform a graceful termination. Lifetime: it is expected that terminationHandler remains callable, during entire lifetime of the ExecutionClient instance. This is especially important if, terminationHandler is bound to an instance of a class (e.g. using std::bind).

Rückgabewert

TypBeschreibung
ara::core::Result<ExecutionClient >a result that contains either a ExecutionClient object or an error.

Fehler

FehlercodeBeschreibung
ara::exec::ExecErrc::kNoCommunicationno_rollback_semantics Communication error occurred. Recovery: try again
ara::exec::ExecErrc::kInvalidArgumentrollback_semantics Given terminationHandler doesn’t contain a callable function. Recovery: change argument
Hinweise: This named constructor may call a constructor defined by the developer.

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Record
AUTOSAR/AP/record/SWS_EM_02562
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valid/unmigrated
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AUTOSAR/AP/record/SWS_EM_02562@rel:R25-11#5f8d0cf1
Content hash
5f8d0cf1
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02562
Status: valid/unmigrated Version: rel:R25-11#446bd257 Versionshistorie & Revisions (1 transition, 4 revision)
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  • R23-11rel:R23-11#10b43bed2026-10-14
  • R24-11rel:R24-11#7ed2aeda2026-10-14
  • R25-11rel:R25-11#446bd2572026-10-14 active
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函数 ExecutionClient [SWS_EM_02560] Upstream: RS_EM_00103, RS_AP_00114, RS_AP_00119, RS_AP_00120, RS_AP_00121, RS_AP_00151, RS_AP_00159

ExecutionClient (std::function< void()> terminationHandler) noexcept(false);

Regular constructor for ExecutionClient.

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient
Exception-Sicherheitnot exception safe
Thread-Sicherheitthread-safe

Parameter (in)

ParameterBeschreibung
terminationHandlerCallback which is called if ExecutionClient receives SIGTERM signal. The callback is executed in a background thread. A typical implementation of this callback will set a global flag (and potentially unblock other threads) to perform a graceful termination. Lifetime: it is expected that terminationHandler remains callable, during entire lifetime of the ExecutionClient instance. This is especially important if, terminationHandler is bound to an instance of a class (e.g. using std::bind).

Fehler

FehlercodeBeschreibung
ara::exec::ExecErrc::kNoCommunicationno_rollback_semantics Communication error occurred. Recovery: try again
ara::exec::ExecErrc::kInvalidArgumentrollback_semantics Given terminationHandler doesn’t contain a callable function. Recovery: change argument

Request a governed re-review of this record. The record is not changed immediately.

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Content hash
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https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02560
Status: valid/unmigrated Version: rel:R25-11#b496b6c8 Versionshistorie & Revisions (1 transition, 4 revision)
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Point-in-Time History:
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  • R25-11rel:R25-11#4d2e754f2026-09-30
  • R23-11rel:R23-11#5f898e7b2026-10-14
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函数 ExecutionClient [SWS_EM_02563] Upstream: RS_AP_00145, RS_EM_00103

ExecutionClient (const ExecutionClient &)=delete;

Suppress default copy construction for ExecutionClient.

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient

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AUTOSAR/AP/record/SWS_EM_02563
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Content hash
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https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02563
Status: valid/unmigrated Version: rel:R25-11#48d008ff Versionshistorie & Revisions (1 transition, 4 revision)
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  • R25-11rel:R25-11#48d008ff2026-10-14 active
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函数 ExecutionClient [SWS_EM_02580] Upstream: RS_AP_00145, RS_AP_00151, RS_EM_00103, RS_AP_00159

ExecutionClient (ExecutionClient &&rval) noexcept;

Intentional use of move constructor for ExecutionClient.

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient
Exception-Sicherheitexception safe
Thread-Sicherheitnot thread-safe

Parameter (in)

ParameterBeschreibung
rvalreference to move

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AUTOSAR/AP/record/SWS_EM_02580
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Status: valid/unmigrated Version: rel:R25-11#69808ed1 Versionshistorie & Revisions (1 transition, 4 revision)
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函数 ReportExecutionState [SWS_EM_02003] Upstream: RS_EM_00103, RS_AP_00119, RS_AP_00120, RS_AP_00121, RS_AP_00128, RS_AP_00139, RS_AP_00159

ara::core::Result< void > ReportExecutionState (ExecutionState state) noexcept;

Interface for a Process to report its internal state to Execution Management.

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译自德文指南gemini-3.8-flash-low · 2026-10-13 · 德文原文

使用

来自头文件 ara/exec/execution_client.h 的类 ara::exec::ExecutionClient 的方法 ReportExecutionState 供进程向 Execution Management 报告其当前内部状态 [SWS_EM_02003]。传入类型为 ExecutionState 的参数 state,该参数表示要传输的进程状态 [SWS_EM_02003]。该函数返回 ara::core::Result<void> 的一个实例 [SWS_EM_02003]。由于直接返回 Result 类型而非 Future 对象,该调用可能会同步阻塞,直到向 Execution Management 的移交得到确认为止。 问题 Q-20e897d6a6387c36 (未决)

错误处理

如果在报告时出现问题,返回的 ara::core::Result 将包含相应的 ErrorCode [SWS_EM_02003]:

  • ara::exec::ExecErrc::kNoCommunication:应用程序与 Execution Management 之间存在通信错误,例如因为未收到确认接收 [SWS_EM_02003]。该错误不具有回滚语义;应重试调用以进行恢复 [SWS_EM_02003]。
  • ara::exec::ExecErrc::kInvalidTransition:请求了非法的状态转换,例如在进程已处于状态 Running 时请求转换至 Running [SWS_EM_02003]。此处适用回滚语义;由于状态已处于活跃报告状态,因此无需重新报告 [SWS_EM_02003]。

并发性与限制

该函数声明为 noexcept,并被指定为异常安全(exception safe)[SWS_EM_02003]。此外,执行被归类为线程安全(thread-safe),从而允许并行调用 [SWS_EM_02003]。

本使用说明基于 AUTOSAR Adaptive R25-11 规范自动生成。

实现者指南即将推出(复杂度 I1)

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient
Exception-Sicherheitexception safe
Thread-Sicherheitthread-safe

Parameter (in)

ParameterBeschreibung
stateValue representing the current Process state, that should be reported.

Rückgabewert

TypBeschreibung
ara::core::Result< void >An instance of ara::core::Result. The instance holds an ErrorCode containing either one of the specified errors or a void-value.

Fehler

FehlercodeBeschreibung
ara::exec::ExecErrc::kNoCommunicationno_rollback_semantics Communication error between Application and Execution Management, e.g. unable to get confirmation that report was received. Recovery: try again
ara::exec::ExecErrc::kInvalidTransitionrollback_semantics Invalid transition request (e.g. to Running when already in Running state). Recovery: Already reported kRunning, no need to do it again

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Record
AUTOSAR/AP/record/SWS_EM_02003
Status
valid/unmigrated
Version
AUTOSAR/AP/record/SWS_EM_02003@rel:R25-11#7a266906
Content hash
7a266906
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02003
Status: valid/unmigrated Version: rel:R25-11#8dd3f4fb Versionshistorie & Revisions (1 transition, 8 revision)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/SWS_EM_02003@rel:R25-11#8dd3f4fb
Point-in-Time History:
Recorded Revisions (8):
  • R25-11rel:R25-11#70c6d4fc2026-09-30
  • R19-11rel:R19-11#6ec8f2a12026-10-14
  • R20-11rel:R20-11#7128c8e92026-10-14
  • R21-11rel:R21-11#acde35792026-10-14
  • R22-11rel:R22-11#7a61d6522026-10-14
  • R23-11rel:R23-11#9f4cfa0a2026-10-14
  • R24-11rel:R24-11#9fdbf0442026-10-14
  • R25-11rel:R25-11#8dd3f4fb2026-10-14 active
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 operator= [SWS_EM_02564] Upstream: RS_AP_00145, RS_EM_00103

ExecutionClient & operator= (const ExecutionClient &)=delete;

Suppress default copy assignment for ExecutionClient.

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient

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Record
AUTOSAR/AP/record/SWS_EM_02564
Status
valid/unmigrated
Version
AUTOSAR/AP/record/SWS_EM_02564@rel:R25-11#0d14b6d2
Content hash
0d14b6d2
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02564
Status: valid/unmigrated Version: rel:R25-11#0e69a4c3 Versionshistorie & Revisions (1 transition, 4 revision)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/SWS_EM_02564@rel:R25-11#0e69a4c3
Point-in-Time History:
Recorded Revisions (4):
  • R25-11rel:R25-11#5fd8c8d72026-09-30
  • R23-11rel:R23-11#95edc0282026-10-14
  • R24-11rel:R24-11#0e69a4c32026-10-14
  • R25-11rel:R25-11#0e69a4c32026-10-14 active
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 operator= [SWS_EM_02581] Upstream: RS_AP_00145, RS_AP_00151, RS_EM_00103, RS_AP_00159

ExecutionClient & operator= (ExecutionClient &&rval) noexcept;

Intentional use of move assignment for ExecutionClient.

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient
Exception-Sicherheitexception safe
Thread-Sicherheitnot thread-safe

Parameter (in)

ParameterBeschreibung
rvalreference to move

Rückgabewert

TypBeschreibung
ExecutionClient &the new reference

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Record
AUTOSAR/AP/record/SWS_EM_02581
Status
valid/unmigrated
Version
AUTOSAR/AP/record/SWS_EM_02581@rel:R25-11#3d5be0c2
Content hash
3d5be0c2
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02581
Status: valid/unmigrated Version: rel:R25-11#d50ab3a7 Versionshistorie & Revisions (1 transition, 4 revision)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/SWS_EM_02581@rel:R25-11#d50ab3a7
Point-in-Time History:
Recorded Revisions (4):
  • R25-11rel:R25-11#8bd067d32026-09-30
  • R23-11rel:R23-11#6f06c4d02026-10-14
  • R24-11rel:R24-11#1f7e972e2026-10-14
  • R25-11rel:R25-11#d50ab3a72026-10-14 active
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 ~ExecutionClient [SWS_EM_02002] Upstream: RS_AP_00134, RS_AP_00145, RS_EM_00103

~ExecutionClient () noexcept;

noexcept destructor

Header-Datei#include "ara/exec/execution_client.h"
Scopeclass ara::exec::ExecutionClient
Exception-Sicherheitexception safe
Thread-Sicherheitnot thread-safe
Hinweise: Since ExecutionClient overtake the responsibility for handling SIGTERM signal, it should reset SIGTERM handler back to its original value, when destructor is called.

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/SWS_EM_02002
Status
valid/unmigrated
Version
AUTOSAR/AP/record/SWS_EM_02002@rel:R25-11#5328c8d5
Content hash
5328c8d5
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_ExecutionManagement.pdf#nameddest=SWS_EM_02002
Status: valid/unmigrated Version: rel:R25-11#237e9e13 Versionshistorie & Revisions (1 transition, 8 revision)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/SWS_EM_02002@rel:R25-11#237e9e13
Point-in-Time History:
Recorded Revisions (8):
  • R25-11rel:R25-11#83a6d1fb2026-09-30
  • R19-11rel:R19-11#0b0868932026-10-14
  • R20-11rel:R20-11#5fafdb7e2026-10-14
  • R21-11rel:R21-11#9edc69f82026-10-14
  • R22-11rel:R22-11#017254c22026-10-14
  • R23-11rel:R23-11#cd930a1f2026-10-14
  • R24-11rel:R24-11#a36d0a662026-10-14
  • R25-11rel:R25-11#237e9e132026-10-14 active
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill