types.h File Reference

Defines all structures and global variables needed by the module. More...

#include <linux/types.h>
#include <linux/list.h>
#include <linux/rwsem.h>
#include <linux/workqueue.h>
#include <linux/cdev.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/sched.h>

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Data Structures
struct	msg_t
	Basic structure to represent a message. More...
struct	t_group_members
	Threads that are members of the group device. More...
struct	t_message_deliver
	Contains a 'msg_t' structure and the relative delivery info. More...
struct	t_message_delayed_deliver
	Contains a 'msg_t' structure and the timer needed to delay the delivery. More...
struct	t_group_sysfs
	Contains all the 'sysfs' attrubutes and the group's kobject. More...
struct	msg_manager_t
	Manage the message sub-system. More...
struct	group_t
	System-wide descriptor of a group. More...
struct	group_flags_t
	Contains the various flags that represent the status of the module. More...
struct	t_garbage_collector
	Garbage Collector structure. More...
struct	group_data
	Group device data structure. More...

Macros
#define	DEVICE_NAME_SIZE   64
#define	DEBUG

Functions
struct group_flags_t	__attribute__ ((packed)) g_flags_t
	Contains the various flags that represent the status of the module. More...

Variables
unsigned int	initialized
unsigned int	thread_barrier_loaded
unsigned int	wake_up_flag
unsigned int	sysfs_loaded
unsigned int	strict_mode
unsigned int	garbage_collector_disabled
unsigned int	gc_include_struct

Detailed Description

Defines all structures and global variables needed by the module.

Macro Definition Documentation

DEVICE_NAME_SIZE

#define DEVICE_NAME_SIZE   64

Maximum device name lenght

Function Documentation

__attribute__()

struct group_flags_t __attribute__

(

(packed)

)

Contains the various flags that represent the status of the module.

Those flags are useful since it indicates if a module was correctly initialized, in this way when the module must be unloaded, no deallocation is performed on modules that failed.

• initialized: indicates that a group has loaded all of its structures
• thread_barrier_loaded: indicate that the 'thread barrier' submodule is initialized
• wake_up_flag: to implement
• sysfs_loaded: indicate that the 'sysfs' interface is initialized
• garbage_collector_disabled: specifies the status of the garbage collector
• sysfs_loaded: indicate that the 'sysfs' interface is initialized
• strict_mode: 1 if the strict security mode is enabled, 0 otherwise

  Todo:

  Check the performace impact of "packing" the structure

Variable Documentation

garbage_collector_disabled

unsigned int garbage_collector_disabled

1 if the garbage collector is disabled, zero otherwise

gc_include_struct

unsigned int gc_include_struct

1 if the structure related to a message should be included in the size count

initialized

unsigned int initialized

Set to 1 when the device driver is fully loaded

sysfs_loaded

unsigned int sysfs_loaded

1 if the sysfs submodule is initialized correctly

thread_barrier_loaded

unsigned int thread_barrier_loaded

1 if the 'thread_barrier' submodule is initialized

wake_up_flag

unsigned int wake_up_flag

Flag used to wake-up all thread which slept on barrier