Mailboxes

Collaboration diagram for Mailboxes:

Functions
uint32_t	sys_arch_mbox_fetch (struct sys_mbox **mb, void **msg, uint32_t timeout)
uint32_t	sys_arch_mbox_tryfetch (struct sys_mbox **mb, void **msg)
void	sys_mbox_free (struct sys_mbox **mb)
err_t	sys_mbox_new (struct sys_mbox **mb, int size)
void	sys_mbox_post (struct sys_mbox **mb, void *msg)
void	sys_mbox_set_invalid (struct sys_mbox **mb)
err_t	sys_mbox_trypost (struct sys_mbox **mb, void *msg)
int	sys_mbox_valid (struct sys_mbox **mb)

Detailed Description

Function Documentation

sys_arch_mbox_fetch()

uint32_t sys_arch_mbox_fetch	(	struct sys_mbox **	mb,
		void **	msg,
		uint32_t	timeout
	)

Wait for a new message to arrive in the mbox

Parameters

mbox	mbox to get a message from
msg	pointer where the message is stored
timeout	maximum time (in milliseconds) to wait for a message (0 = wait forever)

Returns

time (in milliseconds) waited for a message, may be 0 if not waited or SYS_ARCH_TIMEOUT on timeout The returned time has to be accurate to prevent timer jitter!

Definition at line 287 of file sys_arch.c.

sys_arch_mbox_tryfetch()

uint32_t sys_arch_mbox_tryfetch	(	struct sys_mbox **	mb,
		void **	msg
	)

Wait for a new message to arrive in the mbox

Parameters

mbox	mbox to get a message from
msg	pointer where the message is stored

Returns

0 (milliseconds) if a message has been received or SYS_MBOX_EMPTY if the mailbox is empty

Definition at line 336 of file sys_arch.c.

sys_mbox_free()

void sys_mbox_free

(

struct sys_mbox **

mb

)

Delete an mbox

Parameters

mbox	mbox to delete

Definition at line 194 of file sys_arch.c.

References NULL, and SYS_MBOX_NULL.

sys_mbox_new()

err_t sys_mbox_new	(	struct sys_mbox **	mb,
		int	size
	)

Create a new mbox of specified size

Parameters

mbox	pointer to the mbox to create
size	(minimum) number of messages in this mbox

Returns

ERR_OK if successful, another err_t otherwise

Definition at line 161 of file sys_arch.c.

sys_mbox_post()

void sys_mbox_post	(	struct sys_mbox **	mb,
		void *	msg
	)

Post a message to an mbox - may not fail -> blocks if full, only used from tasks not from ISR

Parameters

mbox	mbox to posts the message
msg	message to post (ATTENTION: can be NULL)

Definition at line 215 of file sys_arch.c.

References head.

sys_mbox_set_invalid()

void sys_mbox_set_invalid

(

struct sys_mbox **

mb

)

Set an mbox invalid so that sys_mbox_valid returns 0

Definition at line 375 of file sys_arch.c.

sys_mbox_trypost()

err_t sys_mbox_trypost	(	struct sys_mbox **	mb,
		void *	msg
	)

Try to post a message to an mbox - may fail if full or ISR

Parameters

mbox	mbox to posts the message
msg	message to post (ATTENTION: can be NULL)

Definition at line 251 of file sys_arch.c.

References head.

sys_mbox_valid()

int sys_mbox_valid

(

struct sys_mbox **

mb

)

Check if an mbox is valid/allocated: return 1 for valid, 0 for invalid

Definition at line 367 of file sys_arch.c.