Task lifecycle management. More...

Classes
struct	config
	Task configuration parameters. More...

class	self
	Handle for task self-interaction. More...

Public Member Functions
	task (const config &cfg, std::move_only_function< void(self &)> task_func)
	Creates a task with a std::move_only_function callback.

	~task ()
	Destroys the task, requesting stop and blocking until the task function completes.

	task (const task &)=delete

task &	operator= (const task &)=delete

	task (task &&other) noexcept

task &	operator= (task &&other) noexcept

TaskHandle_t	idf_handle () const noexcept
	Returns the underlying FreeRTOS task handle.

const std::string &	name () const noexcept
	Returns the task name.

task_priority	priority () const noexcept
	Returns the current task priority.

size_t	stack_high_water_mark () const noexcept
	Returns the minimum free stack space (in bytes) since the task started.

bool	is_completed () const noexcept
	Checks if the task function has returned.

bool	joinable () const noexcept
	Checks if this task object owns the task.

bool	request_stop () noexcept
	Requests the task to stop.

bool	stop_requested () const noexcept
	Checks if a stop has been requested for this task.

void	suspend ()
	Suspends the task.

void	resume ()
	Resumes a suspended task.

result< void >	try_suspend ()
	Suspends the task.

result< void >	try_resume ()
	Resumes a suspended task.

bool	resume_from_isr () noexcept
	Resumes a suspended task from ISR context.

void	notify ()
	Sends a notification to the task.

result< void >	try_notify ()
	Sends a notification to the task.

bool	notify_from_isr () noexcept
	Sends a notification to the task from ISR context.

void	set_priority (task_priority new_priority)
	Changes the task priority.

result< void >	try_set_priority (task_priority new_priority)
	Changes the task priority.

void	detach ()
	Releases ownership of the task.

result< void >	try_detach ()
	Releases ownership of the task.

void	kill ()
	Immediately terminates the task without waiting for completion.

result< void >	try_kill ()
	Immediately terminates the task without waiting for completion.

void	join ()
	Blocks until the task function completes.

template<typename Rep , typename Period >
void	join (const std::chrono::duration< Rep, Period > &timeout)
	Blocks until the task function completes or the timeout expires.

template<typename Clock , typename Duration >
void	join_until (const std::chrono::time_point< Clock, Duration > &deadline)
	Blocks until the task function completes or the deadline is reached.

result< void >	try_join ()
	Blocks until the task function completes.

template<typename Rep , typename Period >
result< void >	try_join (const std::chrono::duration< Rep, Period > &timeout)
	Blocks until the task function completes or the timeout expires.

template<typename Clock , typename Duration >
result< void >	try_join_until (const std::chrono::time_point< Clock, Duration > &deadline)
	Blocks until the task function completes or the deadline is reached.

Static Public Member Functions
static void	spawn (config cfg, std::move_only_function< void(self &)> task_func)
	Creates a fire-and-forget task with a std::move_only_function callback.

static TaskHandle_t	current_handle () noexcept
	Returns the handle of the currently executing task.

static std::string	current_name ()
	Returns the name of the currently executing task.

Detailed Description

Task lifecycle management.

Manages a task with automatic cleanup on destruction.

Tasks are non-copyable and move-only. Result-returning methods on a moved-from object return errc::invalid_state. Simple accessors return default/null values.

Note: The task function runs in the created task's context, not the caller's context.

Definition at line 47 of file task.hpp.

Constructor & Destructor Documentation

◆ task() [1/3]

idfxx::task::task	(	const config &	cfg,
		std::move_only_function< void(self &)>	task_func
	)

explicit

Creates a task with a std::move_only_function callback.

The task starts executing immediately after construction.

Parameters

cfg	Task configuration.
task_func	Function to execute in the task context. Receives a self reference for task self-interaction.

Exceptions

std::bad_alloc if memory allocation fails.

◆ ~task()

idfxx::task::~task ( )

Destroys the task, requesting stop and blocking until the task function completes.

If the task is still joinable (not detached), the destructor calls request_stop() and then blocks until the task function returns, similar to std::jthread. If the task is suspended, it is automatically resumed so it can observe the stop request and exit. The destructor repeatedly resumes the task to ensure it doesn't suspend again. Tasks that check stop_requested() in their loops will exit cleanly.

Warning: For tasks that ignore the stop request and never return, this will block indefinitely. Call join() with a timeout or detach() explicitly before destruction to avoid indefinite blocking.

◆ task() [2/3]

idfxx::task::task ( const task & )

delete

◆ task() [3/3]

idfxx::task::task ( task && other )

noexcept

Member Function Documentation

◆ current_handle()

static TaskHandle_t idfxx::task::current_handle ( )

inlinestaticnoexcept

Returns the handle of the currently executing task.

Returns: The current task's TaskHandle_t.

Definition at line 695 of file task.hpp.

◆ current_name()

static std::string idfxx::task::current_name ( )

inlinestatic

Returns the name of the currently executing task.

Returns: The current task's name.

Definition at line 702 of file task.hpp.

◆ detach()

void idfxx::task::detach ( )

inline

Releases ownership of the task.

After detaching, the task becomes self-managing and cleans up its resources automatically when the task function returns. The task object becomes non-joinable and the destructor becomes a no-op.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has already been detached.

Definition at line 511 of file task.hpp.

References try_detach(), and idfxx::unwrap().

◆ idf_handle()

TaskHandle_t idfxx::task::idf_handle ( ) const

inlinenoexcept

Returns the underlying FreeRTOS task handle.

Returns: The TaskHandle_t, or nullptr if the task has been detached.

Note: The handle may be invalid after the task function completes. Use is_completed() to check before using the handle.

Definition at line 309 of file task.hpp.

◆ is_completed()

bool idfxx::task::is_completed ( ) const

noexcept

Checks if the task function has returned.

Returns: true if the task function has completed, false otherwise.

◆ join() [1/2]

void idfxx::task::join ( )

inline

Blocks until the task function completes.

Waits indefinitely for the task to finish. After a successful join, the task becomes non-joinable. Prefer join() with a timeout to avoid blocking indefinitely on tasks that may not return promptly.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or already joined (idfxx::errc::invalid_state), or if called from within the task itself (std::errc::resource_deadlock_would_occur).

Definition at line 594 of file task.hpp.

References try_join(), and idfxx::unwrap().

◆ join() [2/2]

template<typename Rep , typename Period >

void idfxx::task::join ( const std::chrono::duration< Rep, Period > & timeout )

inline

Blocks until the task function completes or the timeout expires.

Template Parameters

Rep	The representation type of the duration.
Period	The period type of the duration.

Parameters

timeout Maximum time to wait for the task to complete.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or already joined (idfxx::errc::invalid_state), if called from within the task itself (std::errc::resource_deadlock_would_occur), or if the timeout expires (idfxx::errc::timeout).

Definition at line 609 of file task.hpp.

References idfxx::timeout, try_join(), and idfxx::unwrap().

◆ join_until()

template<typename Clock , typename Duration >

void idfxx::task::join_until ( const std::chrono::time_point< Clock, Duration > & deadline )

inline

Blocks until the task function completes or the deadline is reached.

Template Parameters

Clock	The clock type.
Duration	The duration type of the time point.

Parameters

deadline The time point at which to stop waiting.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or already joined (idfxx::errc::invalid_state), if called from within the task itself (std::errc::resource_deadlock_would_occur), or if the deadline is reached (idfxx::errc::timeout).

Definition at line 626 of file task.hpp.

References try_join_until(), and idfxx::unwrap().

◆ joinable()

bool idfxx::task::joinable ( ) const

inlinenoexcept

Checks if this task object owns the task.

Returns false if the task has been detached or was never successfully created.

Returns: true if this object owns the task handle, false otherwise.

Definition at line 350 of file task.hpp.

◆ kill()

void idfxx::task::kill ( )

inline

Immediately terminates the task without waiting for completion.

Immediately terminates the task. After killing, the task becomes non-joinable.

Warning

This is a dangerous operation that should only be used as a last resort. The task is terminated abruptly at whatever point it is executing:

C++ destructors for stack-allocated objects will not run
Mutexes and locks held by the task will not be released
Dynamic memory allocated by the task will not be freed
Any invariants the task was maintaining may be left in an inconsistent state

These consequences can lead to resource leaks, deadlocks, and undefined behavior in the rest of the system. Prefer using request_stop() and join() to allow the task to complete gracefully, or allow the destructor to block.

If the task function has already returned by the time this method is called, this method simply cleans up resources.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached, already joined, or if called from within the task itself.

Definition at line 553 of file task.hpp.

References try_kill(), and idfxx::unwrap().

◆ name()

const std::string & idfxx::task::name ( ) const

inlinenoexcept

Returns the task name.

Returns: The task name.

Definition at line 316 of file task.hpp.

◆ notify()

void idfxx::task::notify ( )

inline

Sends a notification to the task.

Increments the task's notification value, waking the task if it is blocked in wait() or take(). Can be called multiple times before the task receives — each call increments the notification count.

Uses notification index 0, which is reserved for this purpose.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or completed.

Definition at line 440 of file task.hpp.

References try_notify(), and idfxx::unwrap().

◆ notify_from_isr()

bool idfxx::task::notify_from_isr ( )

noexcept

Sends a notification to the task from ISR context.

Increments the task's notification value, waking the task if it is blocked in wait() or take().

Uses notification index 0, which is reserved for this purpose.

Returns: true if a context switch should be requested, false otherwise. Returns false if the task has been detached or completed.

Note: Pass the return value to idfxx::yield_from_isr() to perform the context switch if needed.

void IRAM_ATTR my_isr() {
    bool need_yield = worker_task->notify_from_isr();
    idfxx::yield_from_isr(need_yield);
}

◆ operator=() [1/2]

task & idfxx::task::operator= ( const task & )

delete

◆ operator=() [2/2]

task & idfxx::task::operator= ( task && other )

noexcept

◆ priority()

task_priority idfxx::task::priority ( ) const

noexcept

Returns the current task priority.

Returns: The task priority, or 0 if the task has been detached or completed.

◆ request_stop()

bool idfxx::task::request_stop ( )

noexcept

Requests the task to stop.

Requests the task to stop cooperatively. The task function can observe this via self::stop_requested(). Also requested automatically by the destructor before joining.

Returns: true if the stop was newly requested (flag was previously false), false if stop was already requested or the task is not joinable.

◆ resume()

void idfxx::task::resume ( )

inline

Resumes a suspended task.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or completed.

Definition at line 388 of file task.hpp.

References try_resume(), and idfxx::unwrap().

◆ resume_from_isr()

bool idfxx::task::resume_from_isr ( )

noexcept

Resumes a suspended task from ISR context.

Returns: true if a context switch should be requested, false otherwise. Returns false if the task has been detached or completed.

Note: Pass the return value to idfxx::yield_from_isr() to perform the context switch if needed.

void IRAM_ATTR my_isr() {
    bool need_yield = worker_task->resume_from_isr();
    idfxx::yield_from_isr(need_yield);
}

◆ set_priority()

void idfxx::task::set_priority ( task_priority new_priority )

inline

Changes the task priority.

Parameters

new_priority The new priority level.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or completed.

Definition at line 488 of file task.hpp.

References try_set_priority(), and idfxx::unwrap().

◆ spawn()

static void idfxx::task::spawn	(	config	cfg,
		std::move_only_function< void(self &)>	task_func
	)

static

Creates a fire-and-forget task with a std::move_only_function callback.

The task starts executing immediately and cleans up its resources when complete.

Parameters

cfg	Task configuration.
task_func	Function to execute in the task context. Receives a self reference for task self-interaction.

Exceptions

std::bad_alloc if memory allocation fails.

◆ stack_high_water_mark()

size_t idfxx::task::stack_high_water_mark ( ) const

noexcept

Returns the minimum free stack space (in bytes) since the task started.

This is useful for tuning stack sizes — a value approaching zero indicates potential stack overflow.

Returns: The minimum free stack space in bytes, or 0 if the task has been detached or completed.

◆ stop_requested()

bool idfxx::task::stop_requested ( ) const

noexcept

Checks if a stop has been requested for this task.

Returns: true if request_stop() has been called, false if not or if the task is not joinable.

◆ suspend()

void idfxx::task::suspend ( )

inline

Suspends the task.

A suspended task will not run until resume() is called.

Note: Only available when CONFIG_COMPILER_CXX_EXCEPTIONS is enabled.

Exceptions

std::system_error if the task has been detached or completed.

Definition at line 380 of file task.hpp.

References try_suspend(), and idfxx::unwrap().

◆ try_detach()

result< void > idfxx::task::try_detach ( )

Releases ownership of the task.

After detaching, the task becomes self-managing and cleans up its resources automatically when the task function returns. The task object becomes non-joinable and the destructor becomes a no-op.

If the task has already completed, ownership is released and resources are cleaned up immediately.

Returns: Success, or an error.

Return values

invalid_state The task has already been detached.

Referenced by detach().

◆ try_join() [1/2]

result< void > idfxx::task::try_join ( )

Blocks until the task function completes.

Waits indefinitely for the task to finish. After a successful join, the task becomes non-joinable. Prefer try_join() with a timeout to avoid blocking indefinitely on tasks that may not return promptly.

Returns: Success, or an error.

Return values

invalid_state	The task has been detached or already joined.
std::errc::resource_deadlock_would_occur	Called from within the task itself.

Referenced by join(), and join().

◆ try_join() [2/2]

template<typename Rep , typename Period >

result< void > idfxx::task::try_join ( const std::chrono::duration< Rep, Period > & timeout )

inline

Blocks until the task function completes or the timeout expires.

After a successful join, the task becomes non-joinable.

Template Parameters

Rep	The representation type of the duration.
Period	The period type of the duration.

Parameters

timeout Maximum time to wait for the task to complete.

Returns: Success, or an error.

Return values

invalid_state	The task has been detached or already joined.
std::errc::resource_deadlock_would_occur	Called from within the task itself.
timeout	The task did not complete within the specified duration. The task remains joinable and can be joined again.

Definition at line 659 of file task.hpp.

References idfxx::chrono::ticks(), and idfxx::timeout.

◆ try_join_until()

template<typename Clock , typename Duration >

result< void > idfxx::task::try_join_until ( const std::chrono::time_point< Clock, Duration > & deadline )

inline

Blocks until the task function completes or the deadline is reached.

After a successful join, the task becomes non-joinable.

Template Parameters

Clock	The clock type.
Duration	The duration type of the time point.

Parameters

deadline The time point at which to stop waiting.

Returns: Success, or an error.

Return values

invalid_state	The task has been detached or already joined.
std::errc::resource_deadlock_would_occur	Called from within the task itself.
timeout	The task did not complete before the deadline. The task remains joinable and can be joined again.

Definition at line 678 of file task.hpp.

References idfxx::chrono::ticks().

Referenced by join_until().

◆ try_kill()

result< void > idfxx::task::try_kill ( )

Immediately terminates the task without waiting for completion.

Immediately terminates the task. After killing, the task becomes non-joinable.

Warning

This is a dangerous operation that should only be used as a last resort. The task is terminated abruptly at whatever point it is executing:

C++ destructors for stack-allocated objects will not run
Mutexes and locks held by the task will not be released
Dynamic memory allocated by the task will not be freed
Any invariants the task was maintaining may be left in an inconsistent state

These consequences can lead to resource leaks, deadlocks, and undefined behavior in the rest of the system. Prefer using request_stop() and try_join() to allow the task to complete gracefully, or allow the destructor to block.

If the task function has already returned by the time this method is called, this method simply cleans up resources.

Returns: Success, or an error.

Return values

invalid_state The task has been detached, already joined, or called from within the task itself.

Referenced by kill().

◆ try_notify()

result< void > idfxx::task::try_notify ( )

Sends a notification to the task.

Increments the task's notification value, waking the task if it is blocked in wait() or take(). Can be called multiple times before the task receives — each call increments the notification count.

Uses notification index 0, which is reserved for this purpose.

Returns: Success, or an error.

Return values

invalid_state The task has been detached or completed.

Referenced by notify().

◆ try_resume()

result< void > idfxx::task::try_resume ( )

Resumes a suspended task.

Returns: Success, or an error.

Return values

invalid_state The task has been detached or completed.

Referenced by resume().

◆ try_set_priority()

result< void > idfxx::task::try_set_priority ( task_priority new_priority )

Changes the task priority.

Parameters

new_priority The new priority level.

Returns: Success, or an error.

Return values

invalid_state The task has been detached or completed.

Referenced by set_priority().

◆ try_suspend()

result< void > idfxx::task::try_suspend ( )

Suspends the task.

A suspended task will not run until resume() is called.

Returns: Success, or an error.

Return values

invalid_state The task has been detached or completed.

Referenced by suspend().

The documentation for this class was generated from the following file:

idfxx_task/include/idfxx/task.hpp

Classes

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ task() [1/3]

◆ ~task()

◆ task() [2/3]

◆ task() [3/3]

Member Function Documentation

◆ current_handle()

◆ current_name()

◆ detach()

◆ idf_handle()

◆ is_completed()

◆ join() [1/2]

◆ join() [2/2]

◆ join_until()

◆ joinable()

◆ kill()

◆ name()

◆ notify()

◆ notify_from_isr()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ priority()

◆ request_stop()

◆ resume()

◆ resume_from_isr()

◆ set_priority()

◆ spawn()

◆ stack_high_water_mark()

◆ stop_requested()

◆ suspend()

◆ try_detach()

◆ try_join() [1/2]

◆ try_join() [2/2]

◆ try_join_until()

◆ try_kill()

◆ try_notify()

◆ try_resume()

◆ try_set_priority()

◆ try_suspend()