Collaboration diagram for I/O Bytes Queues:

Detailed Description

Queues are mostly used in serial-like device drivers. Serial device drivers are usually designed to have a lower side (lower driver, it is usually an interrupt service routine) and an upper side (upper driver, accessed by the application threads).
There are several kind of queues:

Input queue, unidirectional queue where the writer is the lower side and the reader is the upper side.
Output queue, unidirectional queue where the writer is the upper side and the reader is the lower side.
Full duplex queue, bidirectional queue. Full duplex queues are implemented by pairing an input queue and an output queue together.

Queue functions returned status value
#define	Q_OK MSG_OK
	Operation successful. More...

#define	Q_TIMEOUT MSG_TIMEOUT
	Timeout condition. More...

#define	Q_RESET MSG_RESET
	Queue has been reset. More...

#define	Q_EMPTY MSG_TIMEOUT
	Queue empty. More...

#define	Q_FULL MSG_TIMEOUT
	Queue full,. More...

Macro Functions
#define	qSizeX(qp)
	Returns the queue's buffer size. More...

#define	qSpaceI(qp) ((qp)->q_counter)
	Queue space. More...

#define	qGetLink(qp) ((qp)->q_link)
	Returns the queue application-defined link. More...

#define	qSetLink(qp, lk) ((qp)->q_link = lk)
	Sets the queue application-defined link. More...

#define	iqGetFullI(iqp) qSpaceI(iqp)
	Returns the filled space into an input queue. More...

#define	iqGetEmptyI(iqp) (qSizeX(iqp) - qSpaceI(iqp))
	Returns the empty space into an input queue. More...

#define	iqIsEmptyI(iqp) ((bool)(qSpaceI(iqp) == 0U))
	Evaluates to `true` if the specified input queue is empty. More...

#define	iqIsFullI(iqp)
	Evaluates to `true` if the specified input queue is full. More...

#define	iqGet(iqp) iqGetTimeout(iqp, TIME_INFINITE)
	Input queue read. More...

#define	oqGetFullI(oqp) (qSizeX(oqp) - qSpaceI(oqp))
	Returns the filled space into an output queue. More...

#define	oqGetEmptyI(oqp) qSpaceI(oqp)
	Returns the empty space into an output queue. More...

#define	oqIsEmptyI(oqp)
	Evaluates to `true` if the specified output queue is empty. More...

#define	oqIsFullI(oqp) ((bool)(qSpaceI(oqp) == 0U))
	Evaluates to `true` if the specified output queue is full. More...

#define	oqPut(oqp, b) oqPutTimeout(oqp, b, TIME_INFINITE)
	Output queue write. More...

Typedefs
typedef struct io_queue	io_queue_t
	Type of a generic I/O queue structure. More...

typedef void(*	qnotify_t) (io_queue_t *qp)
	Queue notification callback type. More...

typedef io_queue_t	input_queue_t
	Type of an input queue structure. More...

typedef io_queue_t	output_queue_t
	Type of an output queue structure. More...

Data Structures
struct	io_queue
	Generic I/O queue structure. More...

Functions
static size_t	iq_read (input_queue_t iqp, uint8_t bp, size_t n)
	Non-blocking input queue read. More...

static size_t	oq_write (output_queue_t oqp, const uint8_t bp, size_t n)
	Non-blocking output queue write. More...

void	iqObjectInit (input_queue_t iqp, uint8_t bp, size_t size, qnotify_t infy, void *link)
	Initializes an input queue. More...

void	iqResetI (input_queue_t *iqp)
	Resets an input queue. More...

msg_t	iqPutI (input_queue_t *iqp, uint8_t b)
	Input queue write. More...

msg_t	iqGetI (input_queue_t *iqp)
	Input queue non-blocking read. More...

msg_t	iqGetTimeout (input_queue_t *iqp, sysinterval_t timeout)
	Input queue read with timeout. More...

size_t	iqReadI (input_queue_t iqp, uint8_t bp, size_t n)
	Input queue non-blocking read. More...

size_t	iqReadTimeout (input_queue_t iqp, uint8_t bp, size_t n, sysinterval_t timeout)
	Input queue read with timeout. More...

void	oqObjectInit (output_queue_t oqp, uint8_t bp, size_t size, qnotify_t onfy, void *link)
	Initializes an output queue. More...

void	oqResetI (output_queue_t *oqp)
	Resets an output queue. More...

msg_t	oqPutI (output_queue_t *oqp, uint8_t b)
	Output queue non-blocking write. More...

msg_t	oqPutTimeout (output_queue_t *oqp, uint8_t b, sysinterval_t timeout)
	Output queue write with timeout. More...

msg_t	oqGetI (output_queue_t *oqp)
	Output queue read. More...

size_t	oqWriteI (output_queue_t oqp, const uint8_t bp, size_t n)
	Output queue non-blocking write. More...

size_t	oqWriteTimeout (output_queue_t oqp, const uint8_t bp, size_t n, sysinterval_t timeout)
	Output queue write with timeout. More...

Macro Definition Documentation

#define Q_OK MSG_OK

Operation successful.

Definition at line 36 of file hal_queues.h.

#define Q_TIMEOUT MSG_TIMEOUT

Timeout condition.

Definition at line 37 of file hal_queues.h.

#define Q_RESET MSG_RESET

Queue has been reset.

Definition at line 38 of file hal_queues.h.

#define Q_EMPTY MSG_TIMEOUT

Queue empty.

Definition at line 39 of file hal_queues.h.

#define Q_FULL MSG_TIMEOUT

Queue full,.

Definition at line 40 of file hal_queues.h.

#define qSizeX ( qp )

Value:

/*lint -save -e9033 [10.8] The cast is safe.*/                            \
  ((size_t)((qp)->q_top - (qp)->q_buffer))                                  \
  /*lint -restore*/

Returns the queue's buffer size.

Parameters

[in] qp pointer to a io_queue_t structure

Returns: The buffer size.

Function Class:This is an X-Class API, this function can be invoked from any context.

Definition at line 127 of file hal_queues.h.

Referenced by oqResetI().

#define qSpaceI ( qp ) ((qp)->q_counter)

Queue space.

Returns the used space if used on an input queue or the empty space if used on an output queue.

Parameters

[in] qp pointer to a io_queue_t structure

Returns: The buffer space.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 142 of file hal_queues.h.

#define qGetLink ( qp ) ((qp)->q_link)

Returns the queue application-defined link.

Note: This function can be called in any context.

Parameters

[in] qp pointer to a io_queue_t structure

Returns: The application-defined link.

Function Class:Special function, this function has special requirements see the notes.

Definition at line 153 of file hal_queues.h.

#define qSetLink	(	qp,
		lk
	)	((qp)->q_link = lk)

Sets the queue application-defined link.

Note: This function can be called in any context.

Parameters

[in]	qp	pointer to a `io_queue_t` structure
[in]	lk	The application-defined link.

Function Class:Special function, this function has special requirements see the notes.

Definition at line 164 of file hal_queues.h.

#define iqGetFullI ( iqp ) qSpaceI(iqp)

Returns the filled space into an input queue.

Parameters

[in] iqp pointer to an input_queue_t structure

Returns: The number of full bytes in the queue.

Return values

0	if the queue is empty.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 175 of file hal_queues.h.

Referenced by iq_read().

#define iqGetEmptyI ( iqp ) (qSizeX(iqp) - qSpaceI(iqp))

Returns the empty space into an input queue.

Parameters

[in] iqp pointer to an input_queue_t structure

Returns: The number of empty bytes in the queue.

Return values

0	if the queue is full.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 186 of file hal_queues.h.

#define iqIsEmptyI ( iqp ) ((bool)(qSpaceI(iqp) == 0U))

Evaluates to true if the specified input queue is empty.

Parameters

[in] iqp pointer to an input_queue_t structure

Returns: The queue status.

Return values

false	if the queue is not empty.
true	if the queue is empty.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 198 of file hal_queues.h.

Referenced by iqGetI(), iqGetTimeout(), sdGetWouldBlock(), and sdIncomingDataI().

#define iqIsFullI ( iqp )

Value:

/*lint -save -e9007 [13.5] No side effects, a pointer is passed.*/        \
  ((bool)(((iqp)->q_wrptr == (iqp)->q_rdptr) && ((iqp)->q_counter != 0U)))  \
  /*lint -restore*/

Evaluates to true if the specified input queue is full.

Parameters

[in] iqp pointer to an input_queue_t structure

Returns: The queue status.

Return values

false	if the queue is not full.
true	if the queue is full.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 210 of file hal_queues.h.

Referenced by iqPutI().

#define iqGet ( iqp ) iqGetTimeout(iqp, TIME_INFINITE)

Input queue read.

This function reads a byte value from an input queue. If the queue is empty then the calling thread is suspended until a byte arrives in the queue.

Parameters

[in] iqp pointer to an input_queue_t structure

Returns: A byte value from the queue.

Return values

MSG_RESET if the queue has been reset.

Function Class:Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 227 of file hal_queues.h.

#define oqGetFullI ( oqp ) (qSizeX(oqp) - qSpaceI(oqp))

Returns the filled space into an output queue.

Parameters

[in] oqp pointer to an output_queue_t structure

Returns: The number of full bytes in the queue.

Return values

0	if the queue is empty.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 238 of file hal_queues.h.

#define oqGetEmptyI ( oqp ) qSpaceI(oqp)

Returns the empty space into an output queue.

Parameters

[in] oqp pointer to an output_queue_t structure

Returns: The number of empty bytes in the queue.

Return values

0	if the queue is full.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 249 of file hal_queues.h.

Referenced by oq_write().

#define oqIsEmptyI ( oqp )

Value:

/*lint -save -e9007 [13.5] No side effects, a pointer is passed.*/        \
  ((bool)(((oqp)->q_wrptr == (oqp)->q_rdptr) && ((oqp)->q_counter != 0U)))  \
  /*lint -restore*/

Evaluates to true if the specified output queue is empty.

Parameters

[in] oqp pointer to an output_queue_t structure

Returns: The queue status.

Return values

false	if the queue is not empty.
true	if the queue is empty.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 261 of file hal_queues.h.

Referenced by oqGetI().

#define oqIsFullI ( oqp ) ((bool)(qSpaceI(oqp) == 0U))

Evaluates to true if the specified output queue is full.

Parameters

[in] oqp pointer to an output_queue_t structure

Returns: The queue status.

Return values

false	if the queue is not full.
true	if the queue is full.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 276 of file hal_queues.h.

Referenced by oqPutI(), oqPutTimeout(), and sdPutWouldBlock().

#define oqPut	(	oqp,
		b
	)	oqPutTimeout(oqp, b, TIME_INFINITE)

Output queue write.

This function writes a byte value to an output queue. If the queue is full then the calling thread is suspended until there is space in the queue.

Parameters

[in]	oqp	pointer to an `output_queue_t` structure
[in]	b	the byte value to be written in the queue

Returns: The operation status.

Return values

MSG_OK	if the operation succeeded.
MSG_RESET	if the queue has been reset.

Function Class:Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 292 of file hal_queues.h.

Typedef Documentation

typedef struct io_queue io_queue_t

Type of a generic I/O queue structure.

Definition at line 58 of file hal_queues.h.

typedef void(* qnotify_t) (io_queue_t *qp)

Queue notification callback type.

Parameters

[in] qp the queue pointer

Definition at line 65 of file hal_queues.h.

typedef io_queue_t input_queue_t

Type of an input queue structure.

This structure represents a generic asymmetrical input queue. Writing to the queue is non-blocking and can be performed from interrupt handlers or from within a kernel lock zone. Reading the queue can be a blocking operation and is supposed to be performed by a system thread.

Definition at line 97 of file hal_queues.h.

typedef io_queue_t output_queue_t

Type of an output queue structure.

This structure represents a generic asymmetrical output queue. Reading from the queue is non-blocking and can be performed from interrupt handlers or from within a kernel lock zone. Writing the queue can be a blocking operation and is supposed to be performed by a system thread.

Definition at line 109 of file hal_queues.h.

Function Documentation

static size_t iq_read	(	input_queue_t *	iqp,
		uint8_t *	bp,
		size_t	n
	)

static

Non-blocking input queue read.

The function reads data from an input queue into a buffer. The operation completes when the specified amount of data has been transferred or when the input queue has been emptied.

Parameters

[in]	iqp	pointer to an `input_queue_t` structure
[out]	bp	pointer to the data buffer
[in]	n	the maximum amount of data to be transferred, the value 0 is reserved

Returns: The number of bytes effectively transferred.

Function Class:Not an API, this function is for internal use only.

Definition at line 60 of file hal_queues.c.

References iqGetFullI, osalDbgCheck, io_queue::q_buffer, io_queue::q_counter, io_queue::q_rdptr, and io_queue::q_top.

Referenced by iqReadI(), and iqReadTimeout().

static size_t oq_write	(	output_queue_t *	oqp,
		const uint8_t *	bp,
		size_t	n
	)

static

Non-blocking output queue write.

The function writes data from a buffer to an output queue. The operation completes when the specified amount of data has been transferred or when the output queue has been filled.

Parameters

[in]	oqp	pointer to an `output_queue_t` structure
[in]	bp	pointer to the data buffer
[in]	n	the maximum amount of data to be transferred, the value 0 is reserved

Returns: The number of bytes effectively transferred.

Function Class:Not an API, this function is for internal use only.

Definition at line 108 of file hal_queues.c.

References oqGetEmptyI, osalDbgCheck, io_queue::q_buffer, io_queue::q_counter, io_queue::q_top, and io_queue::q_wrptr.

Referenced by oqWriteI(), and oqWriteTimeout().

void iqObjectInit	(	input_queue_t *	iqp,
		uint8_t *	bp,
		size_t	size,
		qnotify_t	infy,
		void *	link
	)

Initializes an input queue.

A Semaphore is internally initialized and works as a counter of the bytes contained in the queue.

Note: The callback is invoked from within the S-Locked system state.

Parameters

[out]	iqp	pointer to an `input_queue_t` structure
[in]	bp	pointer to a memory area allocated as queue buffer
[in]	size	size of the queue buffer
[in]	infy	pointer to a callback function that is invoked when data is read from the queue. The value can be `NULL`.
[in]	link	application defined pointer

Function Class:Initializer, this function just initializes an object and can be invoked before the kernel is initialized.

Definition at line 177 of file hal_queues.c.

References osalThreadQueueObjectInit(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_link, io_queue::q_notify, io_queue::q_rdptr, io_queue::q_top, io_queue::q_waiting, and io_queue::q_wrptr.

Referenced by sdObjectInit().

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void iqResetI ( input_queue_t * iqp )

Resets an input queue.

All the data in the input queue is erased and lost, any waiting thread is resumed with status MSG_RESET.

Note: A reset operation can be used by a low level driver in order to obtain immediate attention from the high level layers.

Parameters

[in] iqp pointer to an input_queue_t structure

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 201 of file hal_queues.c.

References MSG_RESET, osalDbgCheckClassI, osalThreadDequeueAllI(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_rdptr, io_queue::q_waiting, and io_queue::q_wrptr.

Referenced by sdStop().

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msg_t iqPutI	(	input_queue_t *	iqp,
		uint8_t	b
	)

Input queue write.

A byte value is written into the low end of an input queue. The operation completes immediately.

Parameters

[in]	iqp	pointer to an `input_queue_t` structure
[in]	b	the byte value to be written in the queue

Returns: The operation status.

Return values

MSG_OK	if the operation has been completed with success.
MSG_TIMEOUT	if the queue is full.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 224 of file hal_queues.c.

References iqIsFullI, MSG_OK, MSG_TIMEOUT, osalDbgCheckClassI, osalThreadDequeueNextI(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_top, io_queue::q_waiting, and io_queue::q_wrptr.

Referenced by sdIncomingDataI().

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msg_t iqGetI ( input_queue_t * iqp )

Input queue non-blocking read.

This function reads a byte value from an input queue. The operation completes immediately.

Note: The callback is invoked after removing a character from the queue.

Parameters

[in] iqp pointer to an input_queue_t structure

Returns: A byte value from the queue.

Return values

MSG_TIMEOUT	if the queue is empty.
MSG_RESET	if the queue has been reset.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 258 of file hal_queues.c.

References iqIsEmptyI, MSG_TIMEOUT, osalDbgCheckClassI, io_queue::q_buffer, io_queue::q_counter, io_queue::q_notify, io_queue::q_rdptr, and io_queue::q_top.

msg_t iqGetTimeout	(	input_queue_t *	iqp,
		sysinterval_t	timeout
	)

Input queue read with timeout.

This function reads a byte value from an input queue. If the queue is empty then the calling thread is suspended until a byte arrives in the queue or a timeout occurs.

Note: The callback is invoked after removing a character from the queue.

Parameters

[in]	iqp	pointer to an `input_queue_t` structure
[in]	timeout	the number of ticks before the operation timeouts, the following special values are allowed: TIME_IMMEDIATE immediate timeout. TIME_INFINITE no timeout.

Returns: A byte value from the queue.

Return values

MSG_TIMEOUT	if the specified time expired.
MSG_RESET	if the queue has been reset.

Function Class:Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 304 of file hal_queues.c.

References iqIsEmptyI, MSG_OK, osalSysLock(), osalSysUnlock(), osalThreadEnqueueTimeoutS(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_notify, io_queue::q_rdptr, io_queue::q_top, and io_queue::q_waiting.

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size_t iqReadI	(	input_queue_t *	iqp,
		uint8_t *	bp,
		size_t	n
	)

Input queue non-blocking read.

The function reads data from an input queue into a buffer. The operation completes immediately.

Parameters

[in]	iqp	pointer to an `input_queue_t` structure
[out]	bp	pointer to the data buffer
[in]	n	the maximum amount of data to be transferred, the value 0 is reserved

Returns: The number of bytes effectively transferred.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 348 of file hal_queues.c.

References iq_read(), osalDbgCheckClassI, and io_queue::q_notify.

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size_t iqReadTimeout	(	input_queue_t *	iqp,
		uint8_t *	bp,
		size_t	n,
		sysinterval_t	timeout
	)

Input queue read with timeout.

The function reads data from an input queue into a buffer. The operation completes when the specified amount of data has been transferred or after the specified timeout or if the queue has been reset.

Note: The function is not atomic, if you need atomicity it is suggested to use a semaphore or a mutex for mutual exclusion.; The callback is invoked after removing each character from the queue.

Parameters

[in]	iqp	pointer to an `input_queue_t` structure
[out]	bp	pointer to the data buffer
[in]	n	the maximum amount of data to be transferred, the value 0 is reserved
[in]	timeout	the number of ticks before the operation timeouts, the following special values are allowed: TIME_IMMEDIATE immediate timeout. TIME_INFINITE no timeout.

Returns: The number of bytes effectively transferred.

Function Class:Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 389 of file hal_queues.c.

References iq_read(), MSG_OK, osalDbgCheck, osalSysLock(), osalSysUnlock(), osalThreadEnqueueTimeoutS(), io_queue::q_notify, and io_queue::q_waiting.

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void oqObjectInit	(	output_queue_t *	oqp,
		uint8_t *	bp,
		size_t	size,
		qnotify_t	onfy,
		void *	link
	)

Initializes an output queue.

A Semaphore is internally initialized and works as a counter of the free bytes in the queue.

Note: The callback is invoked from within the S-Locked system state.

Parameters

[out]	oqp	pointer to an `output_queue_t` structure
[in]	bp	pointer to a memory area allocated as queue buffer
[in]	size	size of the queue buffer
[in]	onfy	pointer to a callback function that is invoked when data is written to the queue. The value can be `NULL`.
[in]	link	application defined pointer

Function Class:Initializer, this function just initializes an object and can be invoked before the kernel is initialized.

Definition at line 446 of file hal_queues.c.

References osalThreadQueueObjectInit(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_link, io_queue::q_notify, io_queue::q_rdptr, io_queue::q_top, io_queue::q_waiting, and io_queue::q_wrptr.

Referenced by sdObjectInit().

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void oqResetI ( output_queue_t * oqp )

Resets an output queue.

All the data in the output queue is erased and lost, any waiting thread is resumed with status MSG_RESET.

Note: A reset operation can be used by a low level driver in order to obtain immediate attention from the high level layers.

Parameters

[in] oqp pointer to an output_queue_t structure

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 470 of file hal_queues.c.

References MSG_RESET, osalDbgCheckClassI, osalThreadDequeueAllI(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_rdptr, io_queue::q_waiting, io_queue::q_wrptr, and qSizeX.

Referenced by sdStop().

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msg_t oqPutI	(	output_queue_t *	oqp,
		uint8_t	b
	)

Output queue non-blocking write.

This function writes a byte value to an output queue. The operation completes immediately.

Parameters

[in]	oqp	pointer to an `output_queue_t` structure
[in]	b	the byte value to be written in the queue

Returns: The operation status.

Return values

MSG_OK	if the operation succeeded.
MSG_TIMEOUT	if the queue is full.
MSG_RESET	if the queue has been reset.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 494 of file hal_queues.c.

References MSG_OK, MSG_TIMEOUT, oqIsFullI, osalDbgCheckClassI, io_queue::q_buffer, io_queue::q_counter, io_queue::q_notify, io_queue::q_top, and io_queue::q_wrptr.

msg_t oqPutTimeout	(	output_queue_t *	oqp,
		uint8_t	b,
		sysinterval_t	timeout
	)

Output queue write with timeout.

This function writes a byte value to an output queue. If the queue is full then the calling thread is suspended until there is space in the queue or a timeout occurs.

Note: The callback is invoked after putting the character into the queue.

Parameters

[in]	oqp	pointer to an `output_queue_t` structure
[in]	b	the byte value to be written in the queue
[in]	timeout	the number of ticks before the operation timeouts, the following special values are allowed: TIME_IMMEDIATE immediate timeout. TIME_INFINITE no timeout.

Returns: The operation status.

Return values

MSG_OK	if the operation succeeded.
MSG_TIMEOUT	if the specified time expired.
MSG_RESET	if the queue has been reset.

Function Class:Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 540 of file hal_queues.c.

References MSG_OK, oqIsFullI, osalSysLock(), osalSysUnlock(), osalThreadEnqueueTimeoutS(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_notify, io_queue::q_top, io_queue::q_waiting, and io_queue::q_wrptr.

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msg_t oqGetI ( output_queue_t * oqp )

Output queue read.

A byte value is read from the low end of an output queue. The operation completes immediately.

Parameters

[in] oqp pointer to an output_queue_t structure

Returns: The byte value from the queue.

Return values

MSG_TIMEOUT if the queue is empty.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 581 of file hal_queues.c.

References MSG_OK, MSG_TIMEOUT, oqIsEmptyI, osalDbgCheckClassI, osalThreadDequeueNextI(), io_queue::q_buffer, io_queue::q_counter, io_queue::q_rdptr, io_queue::q_top, and io_queue::q_waiting.

Referenced by sdRequestDataI().

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size_t oqWriteI	(	output_queue_t *	oqp,
		const uint8_t *	bp,
		size_t	n
	)

Output queue non-blocking write.

The function writes data from a buffer to an output queue. The operation completes immediately.

Parameters

[in]	oqp	pointer to an `output_queue_t` structure
[in]	bp	pointer to the data buffer
[in]	n	the maximum amount of data to be transferred, the value 0 is reserved

Returns: The number of bytes effectively transferred.

Function Class:This is an I-Class API, this function can be invoked from within a system lock zone by both threads and interrupt handlers.

Definition at line 617 of file hal_queues.c.

References oq_write(), osalDbgCheckClassI, and io_queue::q_notify.

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size_t oqWriteTimeout	(	output_queue_t *	oqp,
		const uint8_t *	bp,
		size_t	n,
		sysinterval_t	timeout
	)

Output queue write with timeout.

The function writes data from a buffer to an output queue. The operation completes when the specified amount of data has been transferred or after the specified timeout or if the queue has been reset.

Note: The function is not atomic, if you need atomicity it is suggested to use a semaphore or a mutex for mutual exclusion.; The callback is invoked after putting each character into the queue.

Parameters

[in]	oqp	pointer to an `output_queue_t` structure
[in]	bp	pointer to the data buffer
[in]	n	the maximum amount of data to be transferred, the value 0 is reserved
[in]	timeout	the number of ticks before the operation timeouts, the following special values are allowed: TIME_IMMEDIATE immediate timeout. TIME_INFINITE no timeout.

Returns: The number of bytes effectively transferred.

Function Class:Normal API, this function can be invoked by regular system threads but not from within a lock zone.

Definition at line 658 of file hal_queues.c.

References MSG_OK, oq_write(), osalDbgCheck, osalSysLock(), osalSysUnlock(), osalThreadEnqueueTimeoutS(), io_queue::q_notify, and io_queue::q_waiting.

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Detailed Description

Queue functions returned status value

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