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Understand the linux kernel-ch3-Process descriptor

2008-06-19 21:39 381 查看

Chapter 3. Processes

a process is an instance of a program in execution

From the kernel's point of view, the purpose of a process is to act

as an entity to which system resources (CPU time, memory, etc.) are allocated

lightweight processes to offer better support for multithreaded applications

Process Descriptor

task_struct

Process State

#define TASK_RUNNING

#define TASK_INTERRUPTIBLE

#define TASK_UNINTERRUPTIBLE

#define TASK_STOPPED

#define TASK_ZOMBIE

#define TASK_DEAD

EXIT_ZOMBIE

EXIT_DEAD

set_task_state

set_current_state

Identifying a Process

PID

tgid

Process descriptors handling

task

movl $0xffffe000,%ecx /* or 0xfffff000 for 4KB stacks */

thread_info

task_struct

andl %esp,%ecx

movl %ecx,p

kernel stack

esp

current macro

//current.h

static inline struct thread_info *current_thread_info(void)

{

struct thread_info *ti;

__asm__("andl %%esp,%0; ":"=r" (ti) : "0" (~8191UL));

return ti;

}

static inline struct task_struct * get_current(void)

{

return current_thread_info()->task;

}

#define current get_current()

Doubly linked lists

LIST_HEAD_INIT

//include/linux/list.h

LIST_HEAD

INIT_LIST_HEAD

：

HLIST_HEAD_INIT

HLIST_HEAD

：

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