ScoreRWLock

ScoreRWLock. More...

Files
file	corerwlockimpl.h
	Inlined Routines Associated with the SuperCore RWLock.
file	corerwlock.c
file	corerwlockobtainread.c
	Obtain RWLock for reading.
file	corerwlockobtainwrite.c
	RWLock Obtain for Writing.
file	corerwlockrelease.c
	Releases the RWLock.

Data Structures
struct	CORE_RWLock_Control

Macros
#define	CORE_RWLOCK_TQ_OPERATIONS   &_Thread_queue_Operations_FIFO
#define	CORE_RWLOCK_THREAD_WAITING_FOR_READ   0
#define	CORE_RWLOCK_THREAD_WAITING_FOR_WRITE   1

Enumerations
enum	CORE_RWLock_States { CORE_RWLOCK_UNLOCKED , CORE_RWLOCK_LOCKED_FOR_READING , CORE_RWLOCK_LOCKED_FOR_WRITING }

Functions
void	_CORE_RWLock_Initialize (CORE_RWLock_Control *the_rwlock)
	Initializes a RWlock. More...
RTEMS_INLINE_ROUTINE void	_CORE_RWLock_Destroy (CORE_RWLock_Control *the_rwlock)
	Destroys a RWlock. More...
RTEMS_INLINE_ROUTINE Thread_Control *	_CORE_RWLock_Acquire (CORE_RWLock_Control *the_rwlock, Thread_queue_Context *queue_context)
	Acquires the RWlock. More...
RTEMS_INLINE_ROUTINE void	_CORE_RWLock_Release (CORE_RWLock_Control *the_rwlock, Thread_queue_Context *queue_context)
	Releases the RWlock. More...
Status_Control	_CORE_RWLock_Seize_for_reading (CORE_RWLock_Control *the_rwlock, bool wait, Thread_queue_Context *queue_context)
	Obtains RWLock for reading. More...
Status_Control	_CORE_RWLock_Seize_for_writing (CORE_RWLock_Control *the_rwlock, bool wait, Thread_queue_Context *queue_context)
	Obtains RWLock for writing. More...
Status_Control	_CORE_RWLock_Surrender (CORE_RWLock_Control *the_rwlock)
	Releases the RWLock. More...

Detailed Description

ScoreRWLock.

Macro Definition Documentation

CORE_RWLOCK_THREAD_WAITING_FOR_READ

#define CORE_RWLOCK_THREAD_WAITING_FOR_READ   0

This is used to denote that a thread is blocking waiting for read-only access to the RWLock.

CORE_RWLOCK_THREAD_WAITING_FOR_WRITE

#define CORE_RWLOCK_THREAD_WAITING_FOR_WRITE   1

This is used to denote that a thread is blocking waiting for write-exclusive access to the RWLock.

Enumeration Type Documentation

CORE_RWLock_States

enum CORE_RWLock_States

RWLock State.

Enumerator
CORE_RWLOCK_UNLOCKED	This indicates the the RWLock is not currently locked.
CORE_RWLOCK_LOCKED_FOR_READING	This indicates the the RWLock is currently locked for reading.
CORE_RWLOCK_LOCKED_FOR_WRITING	This indicates the the RWLock is currently locked for reading.

Function Documentation

_CORE_RWLock_Acquire()

RTEMS_INLINE_ROUTINE Thread_Control * _CORE_RWLock_Acquire	(	CORE_RWLock_Control *	the_rwlock,
		Thread_queue_Context *	queue_context
	)

Acquires the RWlock.

Parameters

[in,out]	the_rwlock	The RWlock to acquire.
	queue_context	The thread queue context.

Returns

The executing thread.

_CORE_RWLock_Destroy()

RTEMS_INLINE_ROUTINE void _CORE_RWLock_Destroy

(

CORE_RWLock_Control *

the_rwlock

)

Destroys a RWlock.

This routine destroys the RWLock.

Parameters

[out]

the_rwlock

is the RWLock to destroy.

_CORE_RWLock_Initialize()

void _CORE_RWLock_Initialize

(

CORE_RWLock_Control *

the_rwlock

)

Initializes a RWlock.

This routine initializes the RWLock.

Parameters

[out]

the_rwlock

is the RWLock to initialize.

_CORE_RWLock_Release()

RTEMS_INLINE_ROUTINE void _CORE_RWLock_Release	(	CORE_RWLock_Control *	the_rwlock,
		Thread_queue_Context *	queue_context
	)

Releases the RWlock.

Parameters

[in,out]	the_rwlock	The RWlock to release.
	queue_context	The thread queue context.

_CORE_RWLock_Seize_for_reading()

Status_Control _CORE_RWLock_Seize_for_reading	(	CORE_RWLock_Control *	the_rwlock,
		bool	wait,
		Thread_queue_Context *	queue_context
	)

Obtains RWLock for reading.

This routine attempts to obtain the RWLock for read access.

Parameters

[in,out]	the_rwlock	is the RWLock to wait for
	wait	Indicates whether the calling thread is willing to wait.
	queue_context	The thread queue context.

Return values

STATUS_SUCCESSFUL	The RWlock was successfully seized.
STATUS_UNAVAILABLE	The RWlock is currently locked for writing and the calling thread is not willing to wait.
STATUS_TIMEOUT	A timeout occured.

_CORE_RWLock_Seize_for_writing()

Status_Control _CORE_RWLock_Seize_for_writing	(	CORE_RWLock_Control *	the_rwlock,
		bool	wait,
		Thread_queue_Context *	queue_context
	)

Obtains RWLock for writing.

This routine attempts to obtain the RWLock for write exclusive access.

Parameters

[in,out]	the_rwlock	The RWLock to wait for.
	wait	Indicates whether the calling thread is willing to wait.
	queue_context	The thread queue context.

Return values

STATUS_SUCCESSFUL	The RWLock was successfully obtained for write exclusive access.
STATUS_UNAVAILABLE	The RWlock is currently locked and the calling thread is not willing to wait.
STATUS_TIMEOUT	A timeout occurred.

_CORE_RWLock_Surrender()

Status_Control _CORE_RWLock_Surrender

(

CORE_RWLock_Control *

the_rwlock

)

Releases the RWLock.

This routine manually releases the_rwlock. All of the threads waiting for the RWLock will be readied.

Parameters

[in,out]

the_rwlock

The RWLock to surrender.

Returns

STATUS_SUCCESSFUL This method is always successful.