OS_FIFO Class Reference

A FIFO is used to pass structures from one task to another. Note: Structures to be passed must have an unused (void *) pointer as its first element. This precludes passing C++ objects with virtual member functions. More...

#include <nbrtos.h>

Inherits OS_TASK_DLY_OBJ.

Public Member Functions
	OS_FIFO ()
	Create and initialize a FIFO object.
uint8_t	Init ()
	Sets the FIFO object to its initial state. More...
uint8_t	Post (OS_FIFO_EL *pToPost)
	This function posts to a FIFO object. More...
uint8_t	PostFirst (OS_FIFO_EL *pToPost)
	This function is identical to Post(), but the element posted is put on the beginning of the FIFO list. More...
OS_FIFO_EL *	Pend (uint32_t timeoutTicks, uint8_t &result)
	This function pends on a FIFO for a specified number of ticks. More...
OS_FIFO_EL *	PendNoWait (uint8_t &result)
	Checks to see if a structure has been posted to a FIFO, but does not wait. More...
OS_FIFO_EL *	Pend (uint32_t timeoutTicks=WAIT_FOREVER)
	This function pends on a FIFO for a specified number of ticks. This is the same as Pend(uint32_t timeoutTicks, uint8_t &result), but does not provide a result code. More...
OS_FIFO_EL *	PendNoWait ()
	Checks to see if a structure has been posted to a FIFO, but does not wait. This is the same as PendNoWait(uint8_t &result), but does not provide a result code. More...

Detailed Description

A FIFO is used to pass structures from one task to another. Note: Structures to be passed must have an unused (void *) pointer as its first element. This precludes passing C++ objects with virtual member functions.

Member Function Documentation

Init()

uint8_t OS_FIFO::Init

(

)

Sets the FIFO object to its initial state.

Return values

OS_NO_ERR

- If successful

See also

NBRTOS Error Codes

Pend() [1/2]

OS_FIFO_EL * OS_FIFO::Pend ( uint32_t  timeoutTicks, uint8_t &  result  )

inline

This function pends on a FIFO for a specified number of ticks.

Parameters

	timeoutTicks	The number of time ticks to wait.
[out]	result	A variable to receive the result code (OS_NO_ERR if successful or OS_TIMEOUT if it fails).

Return values

Structure	If successful
NULL	If it timed out

See also

NBRTOS Error Codes

PendNoWait(uint8_t &result)

Pend(uint32_t timeoutTicks)

Pend() [2/2]

OS_FIFO_EL * OS_FIFO::Pend ( uint32_t  timeoutTicks = WAIT_FOREVER )

inline

This function pends on a FIFO for a specified number of ticks. This is the same as Pend(uint32_t timeoutTicks, uint8_t &result), but does not provide a result code.

Parameters

timeoutTicks

The number of time ticks to wait.

Return values

Structure	If successful
NULL	If it timed out

See also

PendNoWait()

Pend(uint32_t timeoutTicks, uint8_t &result)

PendNoWait() [1/2]

OS_FIFO_EL * OS_FIFO::PendNoWait ( )

inline

Checks to see if a structure has been posted to a FIFO, but does not wait. This is the same as PendNoWait(uint8_t &result), but does not provide a result code.

Return values

Structure	If successful
NULL	If it failed

See also

Pend(uint32_t timeoutTicks)

PendNoWait(uint8_t &result)

PendNoWait() [2/2]

OS_FIFO_EL * OS_FIFO::PendNoWait

(

uint8_t &

result

)

Checks to see if a structure has been posted to a FIFO, but does not wait.

Parameters

[out]

result

A variable to receive the result code (OS_NO_ERR if successful or OS_TIMEOUT if it fails).

Return values

Structure	If successful
NULL	If it failed

See also

NBRTOS Error Codes

Pend(uint32_t timeoutTicks, uint8_t &result)

PendNoWait()

Post()

uint8_t OS_FIFO::Post

(

OS_FIFO_EL *

pToPost

)

This function posts to a FIFO object.

Parameters

pToPost

A pointer to the user's structure cast as an OS_FIFO_EL to be posted to the FIFO.

Return values

OS_NO_ERR

- If successful

See also

NBRTOS Error Codes

PostFirst(OS_FIFO_EL *pToPost)

PostFirst()

uint8_t OS_FIFO::PostFirst

(

OS_FIFO_EL *

pToPost

)

This function is identical to Post(), but the element posted is put on the beginning of the FIFO list.

The task that pends next will get the structure/object posted here, instead of any prior objects posted to the FIFO.

Parameters

pToPost

A pointer to the user's structure cast as an OS_FIFO_EL to be posted to the FIFO.

Return values

OS_NO_ERR

- If successful

See also

NBRTOS Error Codes

Post(OS_FIFO_EL *pToPost)

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

• nbrtos.h
• nbrtos.cpp