Status bit mask of the process

Each process has two independent status flags:

Task->state: Is the runnability of the relationship process;

Task->exit_state: is about task exiting;

#define TASK_RUNNING 0

#define TASK_INTERRUPTIBLE 1

#define Task_uniterruptible 2

#define __TASK_STOPPED 4

#define __TASK_TRACED 8

/* in task->exit_state*/

#define Exit_zombie 16

#define Exit_dead 32

/*in task->state*/

#define TASK_DEAD 64

#define Task_wakekill 128

#define TASK_WAKING 256

The macro definition of the symbol constants used in the Set_task_state () function:

#define Task_killable (Task_wakekill | task_uninterruptible)

#define TASK_STOPPED (Task_wakekill | __task_stopped)

#define TASK_TRACED (Task_wakekill | __task_traced)

The macro definition of the symbol constants used in the Wake_up () function:

#define TASK_NORMAL (task_interruptible | task_uniterruptible)

#define Task_all (task_normal | __task_stopped | __task_traced)

The macro definition of the symbol constants used in the Get_task_state () function:

#define Task_report (task_running | Task_interruptible \

| task_uninterruptible | __task_stopped\

| __task_traced)

Implementation of the Set_task_state () method:

#define Set_task_state (task, state_value) \

SET_MB (Task)->state, (State_value))

The SET_MB () function guarantees the order of execution of the instruction;

#define __set_task_state (task, state_value) \

do{(Task)->state = (state_value);} while (0)

Implementation of the Set_current_stat () method:

#define __SET_CURRENT_STATE (State_value) \

do{current->state = (state_value);} while (0)

#define SET_CURRENT_STATE (State_value) \

SET_MB (Current->state, (State_value))

Status bit mask for a process