1.调试模块debug.h
#ifndef _DEBUG_H
#define _DEBUG_H
#include <linux/kernel.h>
#include <linux/types.h>
#if defined(__KERNEL__)
#define PRINT printk
#else
#include <stdio.h>
#define PRINT printf
#endif
#if !defined(CONFIG_ISCSI_DEBUG)
#define TRACE_SET(mask) do { } while(0)
#define TRACE_GET(mask) do { } while(0)
#define TRACE_TEST(mask) (0)
#define TRACE(mask, args
) do { } while(0)
#define TRACE_BUFFER(mask, buffer, len, args) do { } while(0)
#else
#define TRACE_ENDING 0x0000
#define TRACE_DEBUG 0x0001
#define TRACE_ISCSI_FULL 0x0002
#define TRACE_ISCSI 0x0004
#define TRACE_NET 0x0008
#define TRACE_BUF 0x0010
#define TRACE_SEM 0x0020
#define TRACE_ENTER_LEAVE 0x0040
#define TRACE_MY_MEMORY 0x0080
#define TRACE_TIMERS 0x0100
#define TRACE_ERROR_RECOVERY 0x0200
#define TRACE_VERBOSE 0x0400
#define TRACE_ISER 0x0800
#define TRACE_CHAP 0x1000
#define TRACE_SRP 0x2000
#define TRACE_TASK_MGT 0x4000
#define TRACE_VFS 0x8000
#define TRACE_ALL 0xffff
#ifdef CONFIG_ISCSI_DEBUG
static __u32 iscsi_trace_mask =
TRACE_DEBUG | TRACE_ISCSI_FULL | TRACE_ISCSI | TRACE_NET |
/*** TRACE_BUF | ***/
/*** TRACE_SEM | ***/
/*** TRACE_VFS | ***/
TRACE_ENTER_LEAVE |
/*** TRACE_MY_MEMORY | ***/
/*** TRACE_TIMERS | ***/
/*** TRACE_ERROR_RECOVERY | ***/
/*** TRACE_ISER | ***/
TRACE_ENDING;
#endif
#define TRACE_SET(mask) iscsi_trace_mask = mask
#define TRACE_GET(mask) mask = iscsi_trace_mask
#define TRACE_TEST(mask) (iscsi_trace_mask & (mask))
#define TRACE(mask, args) \
do { \
if (iscsi_trace_mask & (mask)) { \
if (iscsi_trace_mask & TRACE_VERBOSE) { \
PRINT("%s:%d:", __FUNCTION__, __LINE__); \
} \
PRINT(args); \
} \
} while(0)
#define TRACE_BUFFER(mask, buffer, len, args) \
do { \
if (iscsi_trace_mask & (mask)) { \
int ndx; \
PRINT(args); \
for (ndx = 0; ndx < len; ndx++) { \
if ((ndx & 0xf) == 0) { \
PRINT("%3d:", ndx); \
} \
PRINT(" %02x", \
*((__u8 *)(buffer)+ndx)); \
if ((ndx & 0xf) == 0xf) { \
PRINT("\n"); \
} \
} \
if ((ndx & 0xf) != 0) { \
PRINT("\n"); \
} \
} \
} while(0)
#endif
#define TRACE_ERROR(args) \
do { \
PRINT("%s:%d:", __FUNCTION__, __LINE__); \
PRINT(__FILE__ ": ***ERROR*** " args); \
} while(0)
#define TRACE_WARNING(args) \
do { \
PRINT("***Warning*** " args); \
} while(0)
#endif
2.信号量
#include <asm/semaphore.h>
struct semaphore my_mutex_t;
init_MUTEX_LOCKED(&my_mutex_t);
init_MUTEX(&my_mutex_t);
sema_init(&my_mutex_t, count);
down(&my_mutex_t);
down_interruptible(&my_mutex_t);
down_trylock(&my_mutex_t);
up(&my_mutex_t);
3.链表
#include <linux/list.h>
struct list_head cmd_queue;
INIT_LIST_HEAD (&cmd_queue);
if(list_empty (&cmd_queue))
{
//。。。
}
list_for_each_safe (lptr, next, &cmd_queue)
{
//。。。
}
list_del (&cmd_queue->link);
list_add_tail (&cmd->link, &commands);
//struct list_head commands;