Attributes for pthread mutexes. More...

Detailed Description

Attributes for pthread mutexes.

Note: Do not include this header file directly, but pthread.h.

Definition in file pthread_mutex_attr.h.

#include <errno.h>

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Data Structures
struct	pthread_mutexattr_t
	This type is unused right now, and only exists for POSIX compatibility. More...

#define	PTHREAD_MUTEX_NORMAL 0
	A non-error correcting mutex (default).

#define	PTHREAD_MUTEX_RECURSIVE 1
	A mutex that allows recursive locking.

#define	PTHREAD_MUTEX_ERRORCHECK 2
	A mutex that fails with `EDEADLK` if recursive locking was detected.

#define	PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
	The default mutex kind for RIOT.

#define	PTHREAD_PRIO_NONE 0
	No priority inheritance.

#define	PTHREAD_PRIO_INHERIT 1
	If a thread attempts to acquire a held lock, the holding thread gets its dynamic priority increased up to the priority of the blocked thread.

#define	PTHREAD_PRIO_PROTECT 2
	Not implemented, yet.

#define	PTHREAD_MUTEX_STALLED 0
	Mutexes aren't automatically released on the end of a thread.

#define	PTHREAD_MUTEX_ROBUST 1
	Mutexes that are held at the exit of a thread get released automatically.

int	pthread_mutexattr_init (pthread_mutexattr_t *attr)
	Initialize a pthread_mutexattr_t.

int	pthread_mutexattr_destroy (pthread_mutexattr_t *attr)
	Destroys a pthread_mutexattr_t.

int	pthread_mutexattr_getpshared (const pthread_mutexattr_t attr, int pshared)
	Queries the attribute set whether to share the mutex with child processes.

int	pthread_mutexattr_setpshared (pthread_mutexattr_t *attr, int pshared)
	Set whether to share the mutex with child processes.

int	pthread_mutexattr_gettype (const pthread_mutexattr_t attr, int kind)
	Query the type of the mutex to create.

int	pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind)
	Sets the type of the mutex to create.

int	pthread_mutexattr_getprotocol (const pthread_mutexattr_t attr, int protocol)
	Query the priority inheritance of the mutex to create.

int	pthread_mutexattr_setprotocol (pthread_mutexattr_t *attr, int protocol)
	Sets the priority inheritance of the mutex to create.

int	pthread_mutexattr_getprioceiling (const pthread_mutexattr_t attr, int prioceiling)

int	pthread_mutexattr_setprioceiling (pthread_mutexattr_t *attr, int prioceiling)

int	pthread_mutexattr_getrobust (const pthread_mutexattr_t attr, int robustness)
	Query the attribute set whether to create a robut mutex.

int	pthread_mutexattr_setrobust (pthread_mutexattr_t *attr, int robustness)
	Set whether the mutex to create should be robust.

Macro Definition Documentation

◆ PTHREAD_MUTEX_DEFAULT

#define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL

The default mutex kind for RIOT.

Note: Not implemented, yet.

Definition at line 48 of file pthread_mutex_attr.h.

◆ PTHREAD_MUTEX_ERRORCHECK

#define PTHREAD_MUTEX_ERRORCHECK 2

A mutex that fails with EDEADLK if recursive locking was detected.

Note: Not implemented, yet.

Definition at line 47 of file pthread_mutex_attr.h.

◆ PTHREAD_MUTEX_NORMAL

#define PTHREAD_MUTEX_NORMAL 0

A non-error correcting mutex (default).

Definition at line 45 of file pthread_mutex_attr.h.

◆ PTHREAD_MUTEX_RECURSIVE

#define PTHREAD_MUTEX_RECURSIVE 1

A mutex that allows recursive locking.

Note: Not implemented, yet.

Definition at line 46 of file pthread_mutex_attr.h.

◆ PTHREAD_MUTEX_ROBUST

#define PTHREAD_MUTEX_ROBUST 1

Mutexes that are held at the exit of a thread get released automatically.

Note: Not implemented, yet.

Definition at line 83 of file pthread_mutex_attr.h.

◆ PTHREAD_MUTEX_STALLED

#define PTHREAD_MUTEX_STALLED 0

Mutexes aren't automatically released on the end of a thread.

See also: pthread_cleanup_push() for an option to unlock mutexes on the end of a thread.

Note: This is the default.

Definition at line 82 of file pthread_mutex_attr.h.

◆ PTHREAD_PRIO_INHERIT

#define PTHREAD_PRIO_INHERIT 1

If a thread attempts to acquire a held lock, the holding thread gets its dynamic priority increased up to the priority of the blocked thread.

Note: Not implemented, yet.

Definition at line 64 of file pthread_mutex_attr.h.

◆ PTHREAD_PRIO_NONE

#define PTHREAD_PRIO_NONE 0

No priority inheritance.

Prone to inversed priorities. The default mutex protocol.

Definition at line 63 of file pthread_mutex_attr.h.

◆ PTHREAD_PRIO_PROTECT

#define PTHREAD_PRIO_PROTECT 2

Not implemented, yet.

Definition at line 81 of file pthread_mutex_attr.h.

Function Documentation

◆ pthread_mutexattr_destroy()

int pthread_mutexattr_destroy ( pthread_mutexattr_t * attr )

Destroys a pthread_mutexattr_t.

There is no need to ever call this function. This function is a no-op.

Note: This function is not implemented, yet.

Parameters

[in,out] attr Datum to destroy.

Returns: 0 on success. EINVAL if attr == NULL.

◆ pthread_mutexattr_getprotocol()

int pthread_mutexattr_getprotocol	(	const pthread_mutexattr_t *	attr,
		int *	protocol
	)

Query the priority inheritance of the mutex to create.

Note: This implementation only supports PTHREAD_PRIO_NONE mutexes.

Parameters

[in]	attr	Attribute set to query
[out]	protocol	Either PTHREAD_PRIO_NONE or PTHREAD_PRIO_INHERIT or PTHREAD_PRIO_PROTECT.

Returns: 0 on success. EINVAL if attr or protocol are NULL.

◆ pthread_mutexattr_getpshared()

int pthread_mutexattr_getpshared	(	const pthread_mutexattr_t *	attr,
		int *	pshared
	)

Queries the attribute set whether to share the mutex with child processes.

Note: Since RIOT does not implement processes, this value is unused.

Parameters

[in]	attr	Attribute set to query.
[out]	pshared	Either PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.

Returns: 0 on success. EINVAL if attr or pshared are NULL.

◆ pthread_mutexattr_getrobust()

int pthread_mutexattr_getrobust	(	const pthread_mutexattr_t *	attr,
		int *	robustness
	)

Query the attribute set whether to create a robut mutex.

A "robust" mutex releases gets released automagically if the threads exits while it hold the mutex. If the thread is cancellable, only rubust mutex should be held.

Note: This implementation does not support robust mutexes, yet. As it doesn't implement cancellation points, yet, this should not pose a problem.

Parameters

[in]	attr	Attribute set to query.
[out]	robustness	Either PTHREAD_MUTEX_STALLED or PTHREAD_MUTEX_ROBUST.

Returns: 0 on success. EINVAL if the value of protocol is unsupported. EINVAL if attr or robustness is NULL.

◆ pthread_mutexattr_gettype()

int pthread_mutexattr_gettype	(	const pthread_mutexattr_t *	attr,
		int *	kind
	)

Query the type of the mutex to create.

Note: This implementation only supports PTHREAD_MUTEX_NORMAL mutexes.

Parameters

[in]	attr	Attribute set to query.
[out]	kind	Either PTHREAD_MUTEX_NORMAL or PTHREAD_MUTEX_RECURSIVE or PTHREAD_MUTEX_ERRORCHECK.

Returns: 0 on success. EINVAL if attr or kind are NULL.

◆ pthread_mutexattr_init()

int pthread_mutexattr_init ( pthread_mutexattr_t * attr )

Initialize a pthread_mutexattr_t.

A zeroed out datum is initialized

Note: This function is not implemented, yet.

Parameters

[out] attr Datum to initialize.

Returns: 0 on success. EINVAL if attr == NULL.

◆ pthread_mutexattr_setprotocol()

int pthread_mutexattr_setprotocol	(	pthread_mutexattr_t *	attr,
		int	protocol
	)

Sets the priority inheritance of the mutex to create.

Note: This implementation only supports PTHREAD_PRIO_NONE mutexes.

Parameters

[in,out]	attr	Attribute set to change.
[in]	protocol	Either PTHREAD_PRIO_NONE or PTHREAD_PRIO_INHERIT or PTHREAD_PRIO_PROTECT.

Returns: 0 on success. EINVAL if the value of protocol is unsupported. EINVAL if attr == NULL.

◆ pthread_mutexattr_setpshared()

int pthread_mutexattr_setpshared	(	pthread_mutexattr_t *	attr,
		int	pshared
	)

Set whether to share the mutex with child processes.

Note: Since RIOT does not implement processes, this value is unused.

Parameters

[in,out]	attr	Attribute set to change.
[in]	pshared	Either PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.

Returns: 0 on success. EINVAL if pshared is neither PTHREAD_PROCESS_SHARED nor PTHREAD_PROCESS_PRIVATE. EINVAL if attr == NULL.

◆ pthread_mutexattr_setrobust()

int pthread_mutexattr_setrobust	(	pthread_mutexattr_t *	attr,
		int	robustness
	)

Set whether the mutex to create should be robust.

A "robust" mutex releases gets released automagically if the threads exits while it hold the mutex. If the thread is cancellable, only rubust mutex should be held.

Note: This implementation does not support robust mutexes, yet. As it doesn't implement cancellation points, yet, this should not pose a problem.

Parameters

[in,out]	attr	Attribute set to change.
[in]	robustness	Either PTHREAD_MUTEX_STALLED or PTHREAD_MUTEX_ROBUST.

Returns: 0 on success. EINVAL if the value of robustness is unsupported. EINVAL if attr == NULL.

◆ pthread_mutexattr_settype()

int pthread_mutexattr_settype	(	pthread_mutexattr_t *	attr,
		int	kind
	)

Sets the type of the mutex to create.

Note: This implementation only supports PTHREAD_MUTEX_NORMAL mutexes.

Parameters

[in,out]	attr	Attribute set to change.
[in]	kind	Either PTHREAD_MUTEX_NORMAL or PTHREAD_MUTEX_RECURSIVE or PTHREAD_MUTEX_ERRORCHECK.

Returns: 0 on success. EINVAL if the value of kind is unsupported. EINVAL if attr == NULL.

Detailed Description

Data Structures

Macro Definition Documentation

◆ PTHREAD_MUTEX_DEFAULT

◆ PTHREAD_MUTEX_ERRORCHECK

◆ PTHREAD_MUTEX_NORMAL

◆ PTHREAD_MUTEX_RECURSIVE

◆ PTHREAD_MUTEX_ROBUST

◆ PTHREAD_MUTEX_STALLED

◆ PTHREAD_PRIO_INHERIT

◆ PTHREAD_PRIO_NONE

◆ PTHREAD_PRIO_PROTECT

Function Documentation

◆ pthread_mutexattr_destroy()

◆ pthread_mutexattr_getprotocol()

◆ pthread_mutexattr_getpshared()

◆ pthread_mutexattr_getrobust()

◆ pthread_mutexattr_gettype()

◆ pthread_mutexattr_init()

◆ pthread_mutexattr_setprotocol()

◆ pthread_mutexattr_setpshared()

◆ pthread_mutexattr_setrobust()

◆ pthread_mutexattr_settype()