btnut/btnode/include/bt/bt_semaphore.h File Reference

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Detailed Description

Implements mutex and bt_semaphores.

Author:

14:50:09 Mathias Payer <payerm@student.ethz.ch>

Date:

2004/05/07

Data Structures
struct	_bt_semaphore_list
struct	bt_semaphore
	Represents a bt_semaphore, a number of ressources that can be shared by many threads. More...
Functions
void	_bt_semaphore_init (struct bt_semaphore *sema, int initial)
int	_bt_semaphore_post (struct bt_semaphore *sema)
int	_bt_semaphore_postinc (struct bt_semaphore *sema, int val)
int	_bt_semaphore_postval (struct bt_semaphore *sema, int val)
int	_bt_semaphore_trywait (struct bt_semaphore *sema)
int	_bt_semaphore_wait (struct bt_semaphore *sema)
void	bt_semaphore_register_cmds (void)
Variables
_bt_semaphore_list *	_bt_semaphore_head

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Function Documentation

void _bt_semaphore_init	(	struct bt_semaphore *	sema,
		int	initial
	)

Initializes a bt_semaphore

Parameters:

	sema	Pointer to the bt_semaphore
	initial	Initial value of the semaphore

int _bt_semaphore_post

(

struct bt_semaphore *

sema

)

Increases the number of free ressources by 1

Parameters:

sema

Pointer to the bt_semaphore

int _bt_semaphore_postinc	(	struct bt_semaphore *	sema,
		int	val
	)

Increase the number of free ressources by val

Parameters:

	sema	Pointer to the bt_semaphore
	val	Number of additional free ressources

int _bt_semaphore_postval	(	struct bt_semaphore *	sema,
		int	val
	)

Set the number of free ressources to val

Parameters:

	sema	Pointer to the bt_semaphore
	val	Number of free ressources

int _bt_semaphore_trywait

(

struct bt_semaphore *

sema

)

If there are some ressources left, return one, if all ressources are taken, return an error.

Parameters:

sema

Pointer to the bt_semaphore

int _bt_semaphore_wait

(

struct bt_semaphore *

sema

)

If there are some ressources left, return one, if all ressources are taken, wait until a ressource gets freed

Parameters:

sema

Pointer to the bt_semaphore

void bt_semaphore_register_cmds

(

void

)

Prints out the current value of all bt semaphores on the terminal

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